CN114784792A - Power grid planning method for grid connection of photovoltaic power station - Google Patents

Power grid planning method for grid connection of photovoltaic power station Download PDF

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CN114784792A
CN114784792A CN202210331395.8A CN202210331395A CN114784792A CN 114784792 A CN114784792 A CN 114784792A CN 202210331395 A CN202210331395 A CN 202210331395A CN 114784792 A CN114784792 A CN 114784792A
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power supply
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CN114784792B (en
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马靖宇
王笑凯
宋桂贤
沈世林
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Cangzhou Power Supply Co of State Grid Hebei Electric Power Co Ltd
State Grid Corp of China SGCC
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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    • H02J3/38—Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2101/00—Supply or distribution of decentralised, dispersed or local electric power generation
    • H02J2101/20—Dispersed power generation using renewable energy sources
    • H02J2101/22—Solar energy
    • H02J2101/24—Photovoltaics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2103/00—Details of circuit arrangements for mains or AC distribution networks
    • H02J2103/30—Simulating, planning, modelling, reliability check or computer assisted design [CAD] of electric power networks

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Abstract

本发明提供了一种用于光伏电站并网的电网规划方法，属于电网运维技术领域，包括历史估算、初步规划、实际测算、再次规划等步骤。本发明通过先对目标光伏电站进行短期的实际测算，能直接从并网后的结果测算出光照强度与其实际供电量的关系曲线，并依靠此关系曲线按天气预报数据估算出该目标光伏电站未来全天供电量分布，再根据电网的需求对光伏电站的对电网补充的供电量进行事先的规划和调节，能具有更多的响应、调控、修正和补救的时间，从而避免在每个光伏电站上都安装复杂的电气设备进行调节，有利于降低光伏发电和电网运维的设备成本，也更便于运维人员的管理，同时有利于提升电网运行的安全稳定性。

Figure 202210331395

The invention provides a power grid planning method for grid connection of photovoltaic power stations, belonging to the technical field of power grid operation and maintenance, and includes steps of historical estimation, preliminary planning, actual calculation, re-planning and the like. By performing short-term actual measurement on the target photovoltaic power station first, the invention can directly calculate the relationship curve between the light intensity and its actual power supply from the result after grid connection, and rely on the relationship curve to estimate the future of the target photovoltaic power station according to the weather forecast data. The distribution of power supply throughout the day, and then according to the demand of the power grid, the power supply of the photovoltaic power station to the power grid is planned and adjusted in advance, which can have more time for response, regulation, correction and remediation, so as to avoid the need for each photovoltaic power station. The installation of complex electrical equipment for adjustment is conducive to reducing the equipment cost of photovoltaic power generation and power grid operation and maintenance, and is also more convenient for the management of operation and maintenance personnel, and is conducive to improving the safety and stability of power grid operation.

Figure 202210331395

Description

Power grid planning method for grid connection of photovoltaic power station
Technical Field
The invention belongs to the technical field of power grid operation and maintenance, and particularly relates to a power grid planning method for grid connection of a photovoltaic power station.
Background
The photovoltaic power generation grid connection is that direct current generated by a solar component is converted into alternating current meeting the requirements of a mains supply power grid through a grid connection inverter and then is directly connected to a public power grid. In recent years, with the development of photovoltaic technology and the encouragement of related policies, the construction of photovoltaic power stations is gradually increased, and in some areas, the electric energy supply can take a greater proportion.
Because the power supply quantity of the photovoltaic power station is greatly influenced by weather (especially illumination intensity), the characteristics of weak stability of power supply all day and difficult estimation of the power supply quantity exist, and therefore, in order to avoid influencing the operation stability of a power grid, some electrical equipment is required to be used for adjustment.
However, the method of adjusting by using electrical equipment is more suitable for large-scale photovoltaic power stations, but because large-scale photovoltaic power stations have large investment, long construction period and large occupied area, the speed and the quantity of construction and grid connection of the large-scale photovoltaic power stations are far lower than those of distributed small-scale photovoltaic power stations, especially photovoltaic power stations integrated with photovoltaic buildings. And miniature power station exists miniaturization, a large amount, dispersion degree is high, the little characteristics of single photovoltaic power station power supply volume, if all install these electrical equipment to all small-size photovoltaic power stations and adjust, can greatly increased cost, and the management is also very inconvenient. Meanwhile, in recent years, more and more photovoltaic power stations are newly connected to the grid, and the stability of the operation of the power grid can be influenced if a large amount of power stations are connected to the grid in a short period.
Disclosure of Invention
The invention aims to provide a power grid planning method for grid connection of a photovoltaic power station, and aims to solve the technical problems that the stability of power supply of the photovoltaic power station all day is not strong, and the power supply quantity is difficult to estimate, so that the stability of power grid operation is easily influenced in the prior art.
In order to realize the purpose, the invention adopts the technical scheme that: the utility model provides a power grid planning method for grid connection of photovoltaic power stations, which comprises the following steps:
s300, actual measurement and calculation, namely monitoring the illumination intensity of the area where the target photovoltaic power station is located and the actual power supply amount of the target photovoltaic power station within a preset time period after the target photovoltaic power station is connected to a power grid, and generating a second relation curve for the illumination intensity and the actual power supply amount of the target photovoltaic power station;
and S400, planning again, namely combining the weather forecast data of the area with the second relation curve to estimate the future all-day power supply distribution of the target photovoltaic power station, and planning the power supply of the target photovoltaic power station according to the future all-day power supply distribution and the all-day power supply requirement of the power grid of the area, wherein the weather forecast data of the area comprises the all-day illumination intensity distribution.
In a possible implementation manner, before step S300, the method further includes:
s100, historical estimation, namely combining historical data of the operation of the photovoltaic power station in the area with historical illumination intensity data of the area to generate a first relation curve of the illumination intensity and the power supply amount in unit area;
s200, primarily planning, namely combining the scale data of a target photovoltaic power station to be planned, the weather forecast data of the area and the first relation curve to estimate the future all-day power supply distribution of the target photovoltaic power station, and primarily planning the power supply of the target photovoltaic power station according to the future all-day power supply distribution and the all-day power supply requirement of the power grid of the area, wherein the scale data of the target photovoltaic power station comprises the installed capacity of the target photovoltaic power station, and the weather forecast data of the area comprises the all-day illumination intensity distribution.
In one possible implementation, step S100 includes:
s110, obtaining historical data and historical illumination intensity data of operation of the photovoltaic power station in the area, wherein the historical data of operation of the photovoltaic power station comprises average power supply quantity and average electric energy conversion rate of unit area in different time periods of the whole day, and the historical illumination intensity data comprises average illumination intensity in different time periods of the whole day, wherein the average power supply quantity of the unit area in different time periods of the whole day is the average value of the power supply quantity of the unit time in each time period after the whole day is divided into a plurality of time periods, and the average illumination intensity in different time periods of the whole day is the average value of the illumination intensity of the unit time in each time period after the whole day is divided into a plurality of time periods;
s120, establishing a planar rectangular coordinate system by taking the power supply quantity and the illumination intensity as an X axis and a Y axis respectively, and inputting the average power supply quantity and the average illumination intensity corresponding to the same time period into the planar rectangular coordinate system as a point to form a scatter diagram;
s130, fitting the first relation curve on the scatter diagram according to the density degree.
In one possible implementation, the areas of the area are divided according to the power grid management area or according to the climate condition, if the area has historical data of the operation of the photovoltaic power station in the area, the historical data of the operation of the photovoltaic power station in the area is adopted, and if the area has no historical data of the operation of the photovoltaic power station in the area adjacent to the area, the historical data of the operation of the photovoltaic power station in the area adjacent to the area is adopted.
In one possible implementation, step S200 includes:
s210, obtaining scale data of the target photovoltaic power station to be planned, wherein the scale data comprises installed capacity and theoretical electric energy conversion rate of the target photovoltaic power station to be planned;
s220, correcting the first relation curve by using the ratio of the theoretical electric energy conversion rate of the target photovoltaic power station to be planned to the average electric energy conversion rate in the historical data of the operation of the photovoltaic power station in the area to form a corrected first relation curve;
s230, obtaining the illumination intensity distribution of the future whole day through weather forecast data, importing the illumination intensity distribution of the future whole day into the corrected first relation curve, and generating the future whole day power supply distribution of the target photovoltaic power station, wherein the future whole day power supply distribution is the maximum power supply distribution which can be provided by the target photovoltaic power station in different time periods of the future whole day;
s240, predicting the future all-day power supply requirement of the regional power grid, preliminarily planning the future all-day grid-connected electric quantity of the target photovoltaic power station according to the future all-day power supply requirement of the regional power grid, supplying power to the target photovoltaic power station at full load when the power supply requirement of the power grid in a certain period of time is greater than or equal to the power supply quantity of the target photovoltaic power station in the period of time in the future, and supplying power to the target photovoltaic power station according to a power utilization gap part when the power supply requirement of the power grid in the certain period of time in the future is less than the power supply quantity of the target photovoltaic power station in the period of time;
s250, judging the power supply requirement of the regional power grid in real time when the regional power grid runs, and if the deviation between the power supply requirement of the regional power grid and the estimated power supply requirement of the time interval is in an allowable range, carrying out grid-connected power supply according to the original primary plan; if the deviation between the power supply demand of the regional power grid and the estimated power supply demand in the time interval exceeds the allowable range, correcting the original initial plan, namely increasing or reducing the grid-connected electric quantity of the target photovoltaic power station; wherein, the allowable range of the deviation is determined according to the allowable load of the power grid.
In one possible implementation manner, in step S220, the step of performing the correction includes: the average power supply amount to the first relation is multiplied by the ratio.
In one possible implementation, step S300 includes:
s310, after a target photovoltaic power station is connected to a power grid, obtaining average actual power supply quantity of a unit area in different time periods of a whole day of multiple days and average actual illumination intensity of an area where the target photovoltaic power station is located in different time periods of the whole day by monitoring, wherein the average actual power supply quantity of the unit area in different time periods of the whole day is an average value of the actual power supply quantity of the unit time in each time period after the whole day is divided into the multiple time periods, and the average actual illumination intensity in different time periods of the whole day is an average value of the actual illumination intensity of the unit time in each time period after the whole day is divided into the multiple time periods;
s320, establishing a plane rectangular coordinate system by respectively taking the actual power supply quantity and the actual illumination intensity as an X axis and a Y axis, taking the average actual power supply quantity and the average actual illumination intensity corresponding to the same time period as the coordinates of one point, generating the coordinates of all the points of the multi-day data in the step S310, and inputting the coordinates into the plane rectangular coordinate system to form a scatter diagram;
s330, fitting the second relation curve on the scatter diagram according to the density degree.
In one possible implementation, step S400 includes:
s410, obtaining the illumination intensity distribution of the future whole day through weather forecast data, importing the illumination intensity distribution of the future whole day into a second relation curve, and generating the future whole day power supply distribution of the target photovoltaic power station, wherein the future whole day power supply distribution is the maximum power supply distribution which can be provided by the target photovoltaic power station in different time periods of the future whole day;
s420, predicting the future all-day power supply requirement of the regional power grid, preliminarily planning the future all-day grid-connected electric quantity of the target photovoltaic power station according to the future all-day power supply requirement of the regional power grid, supplying power to the target photovoltaic power station at full load when the power supply requirement of the power grid in a certain period of time is greater than or equal to the power supply quantity of the target photovoltaic power station in the period of time in the future, and supplying power to the target photovoltaic power station according to a power utilization gap part when the power supply requirement of the power grid in the certain period of time in the future is less than the power supply quantity of the target photovoltaic power station in the period of time;
s430, judging the power supply requirement of the regional power grid in real time when the regional power grid runs, and if the deviation between the power supply requirement of the regional power grid and the estimated power supply requirement of the time interval is in an allowable range, carrying out grid-connected power supply according to an original primary plan; if the deviation between the power supply demand of the regional power grid and the estimated power supply demand in the time interval exceeds the allowable range, correcting the original initial plan, namely increasing or reducing the grid-connected electric quantity of the target photovoltaic power station; wherein, the allowable range of the deviation is determined according to the allowable load of the power grid.
In a possible implementation manner, the power grid planning method for grid connection of the photovoltaic power station further includes the following steps:
s500, intermittently correcting, namely repeating the step S300 and the step S400 after the target photovoltaic power station operates for a period of time, and correcting;
intermittent corrections are made at least once every season.
In a possible implementation manner, the power grid planning method for grid connection of the photovoltaic power station further includes the following steps:
s600, fault feedback, and in the operation process of the target photovoltaic power station, if the deviation between the grid-connected electric quantity of the target photovoltaic power station and the estimated numerical value exceeds a preset range in a short period, informing operation and maintenance personnel of the target photovoltaic power station, and checking the target photovoltaic power station.
The power grid planning method for grid connection of the photovoltaic power station has the advantages that: compared with the prior art, the method has the advantages that the unreliability of the parameters of the target photovoltaic power station can be ignored by actually measuring and calculating the target photovoltaic power station in a short term, the relation curve of the illumination intensity and the actual power supply quantity is directly measured and calculated from the result after grid connection, the illumination intensity distribution of the target photovoltaic power station in the future all day is firstly calculated according to the relation curve and weather forecast data, the power supply quantity distribution of the target photovoltaic power station in the future all day is estimated according to the illumination intensity distribution of the future all day, the power supply quantity supplemented to the power grid of the photovoltaic power station can be planned and adjusted in advance according to the requirement of the power grid after the power supply quantity distribution in the future all day, the future power supply condition is predicted, compared with the installation of electrical equipment, the method has more time for responding, regulating, correcting and remedying, and therefore, the complicated electrical equipment is prevented from being installed on each photovoltaic power station, the photovoltaic power generation and power grid operation and maintenance equipment cost is reduced, operation and maintenance personnel management is facilitated, and meanwhile, the safety and stability of power grid operation are improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments or the prior art description will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings may be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic diagram of a power grid planning method for grid connection of a photovoltaic power station according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more, and "several" means one or more unless specifically limited otherwise.
The power grid planning method for grid connection of photovoltaic power stations provided by the invention is explained.
The power grid planning method for grid connection of the photovoltaic power station provided by the first embodiment of the invention comprises the following steps:
s100, historical estimation, namely combining historical data of operation of the photovoltaic power station in the area with historical illumination intensity data of the area to generate a first relation curve of the illumination intensity and the power supply amount in unit area.
S200, primarily planning, namely combining the scale data of a target photovoltaic power station to be planned, the weather forecast data of the area and the first relation curve to estimate the future all-day power supply quantity distribution of the target photovoltaic power station, and primarily planning the power supply of the target photovoltaic power station according to the future all-day power supply quantity distribution and the all-day power supply requirement of the power grid of the area, wherein the scale data of the target photovoltaic power station comprises the installed capacity of the target photovoltaic power station, and the weather forecast data of the area comprises the all-day illumination intensity distribution.
S300, actual measurement and calculation, namely monitoring the illumination intensity of the area where the target photovoltaic power station is located and the actual power supply amount of the target photovoltaic power station within a preset time period after the target photovoltaic power station is connected to a power grid, and generating a second relation curve aiming at the illumination intensity and the actual power supply amount of the target photovoltaic power station.
In the actual measurement and calculation stage, under the condition that conditions allow, the target photovoltaic power station supplies power at full load as far as possible so as to monitor more real data; if the conditions are not allowed and must be adjusted to prevent full power, the adjusted time period can be ignored or corrected when the data is processed, and if the amount of data is insufficient, the monitoring time can be increased.
And S400, planning again, namely combining the weather forecast data of the area with the second relation curve to estimate the future all-day power supply distribution of the target photovoltaic power station, and planning the power supply of the target photovoltaic power station according to the future all-day power supply distribution and the all-day power supply requirement of the power grid of the area, wherein the weather forecast data of the area comprises the all-day illumination intensity distribution.
S500, intermittently correcting, namely repeating the step S300 and the step S400 after the target photovoltaic power station operates for a period of time, and correcting; intermittent corrections are made at least once every season.
S600, fault feedback, and in the operation process of the target photovoltaic power station, if the deviation between the grid-connected electric quantity of the target photovoltaic power station and the estimated numerical value exceeds a preset range in a short period, informing operation and maintenance personnel of the target photovoltaic power station, and checking the target photovoltaic power station.
Because the illumination in the same area is approximately consistent, in actual operation, the target photovoltaic power station can be a single photovoltaic power station or a collection of a plurality of same photovoltaic power stations.
The power grid planning method for grid connection of the photovoltaic power station provided by the embodiment comprises the steps of firstly estimating through historical data to generate a first relation curve of the general illumination intensity of the photovoltaic power station and the power supply quantity in unit area, then roughly estimating the future all-day power supply quantity distribution of the photovoltaic power station through the first relation curve generated by utilizing the historical data and combining weather forecast data, the new grid-connected target photovoltaic power station is planned in advance to guide the operation of the new grid-connected target photovoltaic power station, although the historical data can not completely accord with the new grid-connected target photovoltaic power station due to the influence of factors such as the change of the photoelectric conversion rate caused by the technical upgrade and the like, but also can roughly estimate in the trend and carry out peak clipping and valley filling in a targeted manner, thereby ensuring the safety and stability of the power grid to the maximum extent and greatly reducing the pressure of grid connection of large photovoltaic power stations and a large number of small photovoltaic power stations on the safe operation of the power grid; then, by carrying out short-term actual measurement and calculation on the target photovoltaic power station after grid connection, unreliability of parameters of the target photovoltaic power station can be ignored, a second relation curve of the illumination intensity and the actual power supply quantity is directly measured and calculated from results after grid connection, the illumination intensity distribution of the target photovoltaic power station in the future all day is firstly calculated according to weather forecast data by the relation curve, the power supply quantity distribution of the target photovoltaic power station in the future all day is estimated according to the illumination intensity distribution of the future all day, the power supply quantity supplemented to the power grid of the photovoltaic power station can be planned and adjusted in advance according to the requirements of the power grid after the power supply quantity distribution in the future all day, namely, the future power supply condition is predicted, compared with the installation of electrical equipment, the method has more time for response, regulation, correction and remediation, and adjustment, and thus avoiding the installation of complicated electrical equipment on each photovoltaic power station, the photovoltaic power generation and power grid operation and maintenance equipment cost is reduced, the operation and maintenance personnel can manage the photovoltaic power generation and power grid, and the safety and stability of the power grid operation are improved; and then, the influence caused by the reduction of the power supply quantity of the photovoltaic panel due to the reasons of dust accumulation, equipment aging and the like is compensated through intermittent correction, the regulation and control accuracy is ensured, if a target photovoltaic power station breaks down in the operation process, the daily operation data of the target photovoltaic power station can change in a short term, operation and maintenance personnel of the target photovoltaic power station can be informed through a fault feedback mode, the target photovoltaic power station is checked, the loss expansion of the target photovoltaic power station can be avoided, the planning strategy can be timely adjusted according to the feedback condition, and the safe and stable operation of a power grid is ensured.
The power grid planning method for grid connection of the photovoltaic power station provided by the second embodiment of the invention comprises the following steps:
s110, obtaining historical data and historical illumination intensity data of operation of the photovoltaic power station in the area, wherein the historical data of operation of the photovoltaic power station comprises average power supply quantity and average electric energy conversion rate of unit area in different time periods of the whole day, the historical illumination intensity data comprises average illumination intensity in different time periods of the whole day, the average power supply quantity of the unit area in different time periods of the whole day is the average value of the power supply quantity of the unit time in each time period after the whole day is divided into a plurality of time periods, and the average illumination intensity in different time periods of the whole day is the average value of the illumination intensity of the unit time in each time period after the whole day is divided into a plurality of time periods.
The areas of the area are divided according to the power grid management area or the climate condition, if the area has historical data of operation of the photovoltaic power station, the historical data of operation of the photovoltaic power station of the area is adopted, and if the area has no historical data of operation of the photovoltaic power station, the historical data of operation of the photovoltaic power station of the area adjacent to the area is adopted.
S120, establishing a planar rectangular coordinate system by taking the power supply quantity and the illumination intensity as an X axis and a Y axis respectively, and inputting the average power supply quantity and the average illumination intensity corresponding to the same time period into the planar rectangular coordinate system as a point to form a scatter diagram.
S130, fitting the first relation curve on the scatter diagram according to the density degree, so that measurement errors caused by some special reasons can be ignored, and the relation curve is more accurate.
S210, obtaining scale data of the target photovoltaic power station to be planned, wherein the scale data comprises installed capacity and theoretical electric energy conversion rate of the target photovoltaic power station to be planned;
s220, correcting the first relation curve by using the ratio of the theoretical electric energy conversion rate of the target photovoltaic power station to be planned to the average electric energy conversion rate in historical data of the operation of the photovoltaic power station in the area to form a corrected first relation curve; wherein the step of modifying comprises: the average power supply amount to the first relation is multiplied by the ratio.
S230, obtaining the illumination intensity distribution of the future whole day through weather forecast data, importing the illumination intensity distribution of the future whole day into the corrected first relation curve, and generating the future whole day power supply distribution of the target photovoltaic power station, wherein the future whole day power supply distribution is the maximum power supply distribution which can be provided by the target photovoltaic power station in different time periods of the future whole day;
s240, predicting the future all-day power supply requirement of the regional power grid, preliminarily planning the future all-day grid-connected electric quantity of the target photovoltaic power station according to the future all-day power supply requirement of the regional power grid, supplying power to the target photovoltaic power station at full load when the power supply requirement of the power grid in a certain period of time is greater than or equal to the power supply quantity of the target photovoltaic power station in the period of time in the future, and supplying power to the target photovoltaic power station according to a power utilization gap part when the power supply requirement of the power grid in the certain period of time in the future is less than the power supply quantity of the target photovoltaic power station in the period of time;
s250, judging the power supply requirement of the regional power grid in real time when the regional power grid runs, and if the deviation between the power supply requirement of the regional power grid and the estimated power supply requirement of the time period is within an allowable range, carrying out grid-connected power supply according to the original initial plan; if the deviation between the power supply demand of the regional power grid and the estimated power supply demand in the time interval exceeds the allowable range, correcting the original primary plan, namely increasing or reducing the grid-connected electric quantity of the target photovoltaic power station; wherein the allowable deviation range is determined according to the allowable load of the power grid.
S310, after a target photovoltaic power station is connected to a power grid, obtaining average actual power supply quantity of a unit area in different time periods of a whole day of multiple days and average actual illumination intensity of an area where the target photovoltaic power station is located in different time periods of the whole day by monitoring, wherein the average actual power supply quantity of the unit area in different time periods of the whole day is an average value of the actual power supply quantity of the unit time in each time period after the whole day is divided into the multiple time periods, and the average actual illumination intensity in different time periods of the whole day is an average value of the actual illumination intensity of the unit time in each time period after the whole day is divided into the multiple time periods;
s320, establishing a plane rectangular coordinate system by respectively taking the actual power supply quantity and the actual illumination intensity as an X axis and a Y axis, taking the average actual power supply quantity and the average actual illumination intensity corresponding to the same time period as the coordinates of one point, generating the coordinates of all the points of the multi-day data in the step S310, and inputting the coordinates into the plane rectangular coordinate system to form a scatter diagram;
s330, fitting the second relation curve on the scatter diagram according to the density degree.
S410, obtaining the illumination intensity distribution of the future whole day through weather forecast data, and leading the illumination intensity distribution of the future whole day into a second relation curve to generate the future whole day power supply distribution of the target photovoltaic power station, wherein the future whole day power supply distribution is the maximum power supply distribution which can be provided by the target photovoltaic power station in different time periods of the future whole day;
s420, predicting the future all-day power supply requirement of the regional power grid, preliminarily planning the future all-day grid-connected power quantity of the target photovoltaic power station according to the future all-day power supply requirement of the regional power grid, supplying power to the target photovoltaic power station at full load when the power supply requirement of the power grid in a future period is greater than or equal to the power supply quantity of the target photovoltaic power station in the future period, and supplying power to the target photovoltaic power station according to the power utilization gap part when the power supply requirement of the power grid in the future period is smaller than the power supply quantity of the target photovoltaic power station in the future period;
s430, judging the power supply requirement of the regional power grid in real time when the regional power grid runs, and if the deviation between the power supply requirement of the regional power grid and the estimated power supply requirement of the time interval is in an allowable range, carrying out grid-connected power supply according to an original primary plan; if the deviation between the power supply demand of the regional power grid and the estimated power supply demand in the time interval exceeds the allowable range, correcting the original initial plan, namely increasing or reducing the grid-connected electric quantity of the target photovoltaic power station; wherein, the allowable range of the deviation is determined according to the allowable load of the power grid.
S500, intermittently correcting, namely repeating the step S300 and the step S400 after the target photovoltaic power station operates for a period of time, and correcting; intermittent corrections are made at least once every season.
S600, fault feedback is carried out, and in the operation process of the target photovoltaic power station, if deviation between grid-connected electric quantity of the target photovoltaic power station and the estimated numerical value exceeds a preset range in a short period, operation and maintenance personnel of the target photovoltaic power station are notified, and the target photovoltaic power station is checked.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1.一种用于光伏电站并网的电网规划方法，其特征在于，包括以下步骤：1. A power grid planning method for grid-connected photovoltaic power plants, characterized in that, comprising the following steps: S300、实际测算，将目标光伏电站接入电网后，在预定时间段内，监测所述目标光伏电站所在区域的光照强度与目标光伏电站的实际供电量，生成针对所述目标光伏电站的光照强度与实际供电量的第二关系曲线；S300. Actual measurement, after the target photovoltaic power station is connected to the power grid, within a predetermined period of time, monitor the light intensity in the area where the target photovoltaic power station is located and the actual power supply of the target photovoltaic power station, and generate the light intensity for the target photovoltaic power station The second relationship curve with the actual power supply; S400、再次规划，将该地区的天气预报数据和所述第二关系曲线结合，估算出所述目标光伏电站的未来全天供电量分布，并按所述未来全天供电量分布结合该地区电网的全天供电需求，对所述目标光伏电站的供电进行规划，其中，该地区的天气预报数据包括全天的光照强度分布。S400. Plan again, combine the weather forecast data in the area with the second relationship curve, estimate the future all-day power supply distribution of the target photovoltaic power station, and combine the regional power grid according to the future all-day power supply distribution According to the all-day power supply demand, the power supply of the target photovoltaic power station is planned, wherein the weather forecast data of the area includes the distribution of the light intensity throughout the day. 2.如权利要求1所述的用于光伏电站并网的电网规划方法，其特征在于，在步骤S300之前还包括：2. The grid planning method for grid-connected photovoltaic power plants according to claim 1, characterized in that before step S300, the method further comprises: S100、历史估算，将该地区的光伏电站运行的历史数据与该地区的历史光照强度数据结合，生成光照强度与单位面积供电量的第一关系曲线；S100. Historical estimation, combining the historical data of the photovoltaic power station operation in the area with the historical light intensity data of the area to generate a first relationship curve between the light intensity and the power supply per unit area; S200、初步规划，将待规划的目标光伏电站的规模数据、该地区的天气预报数据和所述第一关系曲线结合，估算出所述目标光伏电站的未来全天供电量分布，并按所述未来全天供电量分布结合该地区电网的全天供电需求，对所述目标光伏电站的供电进行初步规划，其中，所述目标光伏电站的规模数据包括目标光伏电站的装机容量，该地区的天气预报数据包括全天的光照强度分布。S200. Preliminary planning, combining the scale data of the target photovoltaic power station to be planned, the weather forecast data of the region, and the first relationship curve to estimate the future all-day power supply distribution of the target photovoltaic power station, and according to the In the future, the distribution of all-day power supply is combined with the all-day power supply demand of the power grid in the region, and the power supply of the target photovoltaic power station is preliminarily planned, wherein the scale data of the target photovoltaic power station includes the installed capacity of the target photovoltaic power station, the weather in the region The forecast data includes the distribution of light intensity throughout the day. 3.如权利要求2所述的用于光伏电站并网的电网规划方法，其特征在于，步骤S100包括：3. The grid planning method for grid-connected photovoltaic power plants according to claim 2, wherein step S100 comprises: S110、获取该地区的光伏电站运行的历史数据和历史光照强度数据，其中，光伏电站运行的历史数据包括全天不同时间段内单位面积的平均供电量和平均电能转化率，历史光照强度数据包括全天不同时间段内的平均光照强度，其中，全天不同时间段内单位面积的平均供电量是指将全天分为多个时间段后每个时间段内单位时间供电量的平均值，全天不同时间段内的平均光照强度是指将全天分为多个时间段后每个时间段内单位时间光照强度的平均值；S110. Acquire historical data and historical light intensity data of the photovoltaic power station operation in the area, wherein the historical data of photovoltaic power station operation includes the average power supply and average power conversion rate per unit area in different time periods throughout the day, and the historical light intensity data includes The average light intensity in different time periods throughout the day, where the average power supply per unit area in different time periods throughout the day refers to the average power supply per unit time in each time period after dividing the whole day into multiple time periods. The average light intensity in different time periods of the whole day refers to the average value of light intensity per unit time in each time period after dividing the whole day into multiple time periods; S120、分别以供电量和光照强度为X轴和Y轴建立平面直角坐标系，将同一时段对应的平均供电量和平均光照强度作为一个点输入所述平面直角坐标系中，形成散点图；S120, take the power supply and the light intensity as the X-axis and the Y-axis respectively to establish a plane rectangular coordinate system, and input the average power supply and the average light intensity corresponding to the same period into the plane rectangular coordinate system as a point to form a scatter diagram; S130、在所述散点图上按疏密程度拟合出所述第一关系曲线。S130. Fit the first relationship curve according to the degree of density on the scattergram. 4.如权利要求3所述的用于光伏电站并网的电网规划方法，其特征在于：该地区的区域按照电网管理区域划分或按照气候条件划分，如果该地区有运行光伏电站运行的历史数据、则采用该地区光伏电站运行的历史数据，如果该地区无运行光伏电站运行的历史数据、则采用与该地区邻近的地区的光伏电站运行的历史数据。4. The power grid planning method for grid-connected photovoltaic power plants according to claim 3, wherein the area of the area is divided according to the power grid management area or according to climatic conditions, if the area has historical data on the operation of photovoltaic power plants , the historical data of the operation of photovoltaic power plants in the area is used, and if there is no historical data of the operation of photovoltaic power plants in the area, the historical data of the operation of photovoltaic power plants in the area adjacent to the area is used. 5.如权利要求3所述的用于光伏电站并网的电网规划方法，其特征在于，步骤S200包括：5. The grid planning method for grid-connected photovoltaic power plants according to claim 3, wherein step S200 comprises: S210、获取待规划的目标光伏电站的规模数据，包括待规划的目标光伏电站的装机容量和理论电能转化率；S210, acquiring scale data of the target photovoltaic power station to be planned, including the installed capacity and theoretical power conversion rate of the target photovoltaic power station to be planned; S220、利用待规划的目标光伏电站的理论电能转化率与该地区光伏电站运行的历史数据中的平均电能转化率的比值对所述第一关系曲线进行修正，形成修正后的第一关系曲线；S220, using the ratio of the theoretical power conversion rate of the target photovoltaic power station to be planned to the average power conversion rate in the historical data of the operation of the photovoltaic power station in the region to modify the first relationship curve to form a modified first relationship curve; S230、通过天气预报数据获得未来全天的光照强度分布，并将未来全天的光照强度分布导入修正后的第一关系曲线后，生成目标光伏电站的未来全天供电量分布，未来全天供电量分布即目标光伏电站的未来全天不同时段能够提供的最大供电量分布；S230. Obtain the light intensity distribution of the whole day in the future through the weather forecast data, and import the light intensity distribution of the whole day in the future into the revised first relationship curve to generate the distribution of the power supply of the target photovoltaic power station in the future, and supply power all day in the future. The distribution is the distribution of the maximum power supply that the target photovoltaic power station can provide at different times throughout the day in the future; S240、预估该地区电网的未来全天供电需求，根据该地区电网的未来全天供电需求，对目标光伏电站未来全天的并网电量进行初步计划，当未来某时段电网的供电需求大于等于目标光伏电站在该时段的供电量时、目标光伏电站满负荷供电，当未来某时段电网的供电需求小于目标光伏电站在该时段的供电量时、目标光伏电站按用电缺口部分供电；S240. Estimate the future all-day power supply demand of the power grid in the region, and make a preliminary plan for the future all-day power supply of the target photovoltaic power station according to the future all-day power supply demand of the power grid in the region. When the power supply demand of the power grid in a certain period in the future is greater than or equal to When the power supply of the target photovoltaic power station in this period, the target photovoltaic power station will supply power at full load, and when the power supply demand of the power grid in a certain period in the future is less than the power supply of the target photovoltaic power station in this period, the target photovoltaic power station will supply power according to the power gap; S250、该地区电网运行时，实时判断该地区电网的供电需求，如果该地区电网的供电需求与该时段预估供电需求之间的偏差在允许的范围内，则按原初步计划进行并网供电；如果该地区电网的供电需求与该时段预估供电需求之间的偏差超出允许的范围，则对原初步计划进行修正，即增加或减少目标光伏电站的并网电量；其中，偏差允许的范围根据电网的允许负荷确定。S250. When the power grid in the region is running, the power supply demand of the power grid in the region is judged in real time. If the deviation between the power supply demand of the power grid in the region and the estimated power supply demand in this period is within the allowable range, the grid-connected power supply is carried out according to the original preliminary plan. ; If the deviation between the power supply demand of the power grid in the region and the estimated power supply demand in this period exceeds the allowable range, the original preliminary plan shall be revised, that is, the grid-connected power of the target photovoltaic power station shall be increased or decreased; among them, the allowable range of deviation Determined according to the allowable load of the grid. 6.如权利要求5所述的用于光伏电站并网的电网规划方法，其特征在于，步骤S220中，进行修正的步骤包括：对第一关系曲线的平均供电量上乘以所述比值。6 . The power grid planning method for grid connection of photovoltaic power plants according to claim 5 , wherein in step S220 , the correction step comprises: multiplying the average power supply of the first relationship curve by the ratio. 7 . 7.如权利要求1所述的用于光伏电站并网的电网规划方法，其特征在于，步骤S300包括：7. The grid planning method for grid-connected photovoltaic power plants according to claim 1, wherein step S300 comprises: S310、目标光伏电站接入电网后，通过监测获得多日的全天不同时间段内单位面积的平均实际供电量和所述目标光伏电站所在区域全天不同时间段内的平均实际光照强度，其中，全天不同时间段内单位面积的平均实际供电量是指将全天分为多个时间段后每个时间段内单位时间实际供电量的平均值，全天不同时间段内的平均实际光照强度是指将全天分为多个时间段后每个时间段内单位时间实际光照强度的平均值；S310. After the target photovoltaic power station is connected to the power grid, the average actual power supply per unit area and the average actual light intensity of the area where the target photovoltaic power station is located in different time periods throughout the day are obtained through monitoring for multiple days, wherein , The average actual power supply per unit area in different time periods throughout the day refers to the average actual power supply per unit time in each time period after dividing the whole day into multiple time periods, and the average actual light in different time periods throughout the day. Intensity refers to the average value of the actual light intensity per unit time in each time period after dividing the whole day into multiple time periods; S320、分别以实际供电量和实际光照强度为X轴和Y轴建立平面直角坐标系，以同一时段对应的平均实际供电量和平均实际光照强度作为一个点的坐标，将步骤S310中的多日数据全部生成点的坐标，并输入所述平面直角坐标系中，形成散点图；S320. Establish a plane rectangular coordinate system with the actual power supply and the actual light intensity as the X-axis and the Y-axis, respectively, and use the average actual power supply and the average actual light intensity corresponding to the same period as the coordinates of a point. The coordinates of all points generated from the data are input into the plane rectangular coordinate system to form a scatter plot; S330、在所述散点图上按疏密程度拟合出所述第二关系曲线。S330. Fit the second relationship curve on the scatter diagram according to the degree of density. 8.如权利要求7所述的用于光伏电站并网的电网规划方法，其特征在于，步骤S400包括：8. The grid planning method for grid-connected photovoltaic power plants according to claim 7, wherein step S400 comprises: S410、通过天气预报数据获得未来全天的光照强度分布，并将未来全天的光照强度分布导入第二关系曲线后，生成目标光伏电站的未来全天供电量分布，未来全天供电量分布即目标光伏电站的未来全天不同时段能够提供的最大供电量分布；S410. Obtain the light intensity distribution of the whole day in the future through the weather forecast data, and import the light intensity distribution of the whole day in the future into the second relation curve to generate the distribution of the power supply of the target photovoltaic power station in the future. The distribution of the power supply in the future is The distribution of the maximum power supply that the target photovoltaic power station can provide at different times of the day in the future; S420、预估该地区电网的未来全天供电需求，根据该地区电网的未来全天供电需求，对目标光伏电站未来全天的并网电量进行初步计划，当未来某时段电网的供电需求大于等于目标光伏电站在该时段的供电量时、目标光伏电站满负荷供电，当未来某时段电网的供电需求小于目标光伏电站在该时段的供电量时、目标光伏电站按用电缺口部分供电；S420. Estimate the future all-day power supply demand of the power grid in the region, and make a preliminary plan for the future all-day power supply of the target photovoltaic power station according to the future all-day power supply demand of the power grid in the region. When the power supply demand of the power grid in a certain period in the future is greater than or equal to When the power supply of the target photovoltaic power station in this period, the target photovoltaic power station will supply power at full load, and when the power supply demand of the power grid in a certain period in the future is less than the power supply of the target photovoltaic power station in this period, the target photovoltaic power station will supply power according to the power gap; S430、该地区电网运行时，实时判断该地区电网的供电需求，如果该地区电网的供电需求与该时段预估供电需求之间的偏差在允许的范围内，则按原初步计划进行并网供电；如果该地区电网的供电需求与该时段预估供电需求之间的偏差超出允许的范围，则对原初步计划进行修正，即增加或减少目标光伏电站的并网电量；其中，偏差允许的范围根据电网的允许负荷确定。S430. When the power grid in the region is running, the power supply demand of the power grid in the region is judged in real time. If the deviation between the power supply demand of the power grid in the region and the estimated power supply demand in this period is within the allowable range, the grid-connected power supply is performed according to the original preliminary plan. ; If the deviation between the power supply demand of the power grid in the region and the estimated power supply demand in this period exceeds the allowable range, the original preliminary plan shall be revised, that is, the grid-connected power of the target photovoltaic power station shall be increased or decreased; among them, the allowable range of deviation Determined according to the allowable load of the grid. 9.如权利要求1所述的用于光伏电站并网的电网规划方法，其特征在于，所述用于光伏电站并网的电网规划方法还包括以下步骤：9 . The grid planning method for grid-connected photovoltaic power plants according to claim 1 , wherein the grid planning method for grid-connected photovoltaic power stations further comprises the following steps: 10 . S500、间歇性修正，在目标光伏电站运行一段时间后，重复步骤S300和步骤S400，进行修正；S500. Intermittent correction, after the target photovoltaic power station has been running for a period of time, repeat steps S300 and S400 to perform correction; 间歇性修正至少在每个季节进行一次。Intermittent corrections are made at least once per season. 10.如权利要求1所述的用于光伏电站并网的电网规划方法，其特征在于，所述用于光伏电站并网的电网规划方法还包括以下步骤：10 . The grid planning method for grid-connected photovoltaic power stations according to claim 1 , wherein the grid planning method for grid-connected photovoltaic power stations further comprises the following steps: 11 . S600、故障反馈，在目标光伏电站运行过程中，若出现短期内目标光伏电站的并网电量与估算出的数值之间的偏差超过预设范围，则通知目标光伏电站的运维人员，对目标光伏电站进行检查。S600. Fault feedback. During the operation of the target photovoltaic power station, if the deviation between the grid-connected power of the target photovoltaic power station and the estimated value exceeds a preset range in a short period of time, the operation and maintenance personnel of the target photovoltaic power station will be notified, and the target photovoltaic power station will be notified. PV power plants are inspected.
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