JPH06165377A - Power system operating device - Google Patents

Abstract

(57) [Abstract] [Purpose] In the operating device of the power distribution system, the facility change maintenance is performed in a short time by calculating the allowable passing current of the high-voltage line, which is performed every time maintenance is performed. [Structure] Storage means for storing the allowable passing current values of all distribution lines constituting the distribution system and online information such as classification switches, and a load for recognizing the SW on the load side for each span of the high voltage line in the distribution system Side SW recognition means, a passing current determination means for calculating a passing current in each section by using values from the storage means and the load side SW recognizing means, and determining whether the passing current is equal to or less than the allowable passing current of the section. In determining the pattern for performing the interchange calculation, the operating device of the power system, which is provided with the determination conditions of the passing current determining means and is configured to determine the optimal accommodation operation procedure, allows the passage of the distribution line accompanying the facility change of the power system. A current value optimum necessity determination means 1D and an allowable passing current value generation means 1E are added.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating device for a power system, and more particularly, to a form of an optimum power distribution system satisfying a constraint condition when transmitting power from another healthy distribution line to a concession section. The present invention relates to an operating device of a power system that performs calculation and operates based on the calculation result.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram showing a configuration of a conventional operating device for a power system, and FIG. 9 is a power system diagram. In FIG. 9, SSi (i = 1,2,3,4, x) is a distribution substation,
Normally, the distribution line Fi is led out from the bus bar via the transformer and the feeder (distribution line) breaker CBi. The distribution line Fi is divided into distribution sections K1, K2, K3, ..., Kx by a plurality of distribution switches SWi, and is connected to other distribution lines. On the other hand, although not shown, each feeder is equipped with a current transformer and a feeder current measuring device to detect the feeder current (current of the distribution line lead-out part). The online status information such as the open / close status signals of switches such as the switch CBi and the classification switch SWi is transmitted to the control station shown in FIG. 8 via the teleconverter slave station and the teleconverter master station TCo constituting the signal transmission device provided in each station. It is input to the interchange power transmission operating unit (comprised of a digital arithmetic unit such as an electronic computer) CONT of the operating device or the monitoring panel (not shown).

The monitoring panel displays the current switch status of the power distribution system, feeder current, etc., while the interchange power transmission controller C
The ONT stores on-line information obtained from the signal transmission device in its memory portion, and also in each power distribution section such as K1.
, K2, K3, ... The section load current values scheduled for each are stored. The section load current can be fetched as online information via the signal transmission device. The flexible power transmission operation unit CONT uses the flexible power transmission from the information stored in advance and the online information when an accident occurs in the power distribution system, when an overload is detected, and when a work power failure is performed based on the operator's instruction. (Hereinafter, referred to as flexible calculation) is performed, and the calculation result is sent as a control signal to the switch via the signal transmission device.

This accommodation calculation is a condition of one or more blackout sections and the state of the distribution system (information indicating the connection between the section switch and the section, that is, the connection to both ends of a certain distribution section) under given constraints. Which of the segmented switches has a starting point,
Based on the information about which is the end, the switching status signal of the switch, the current of the transformer or distribution line, and the load current of each distribution section) It is a calculation to find the optimum switch operating procedure (optimal solution) that matches the objective function for the power transmission to the power failure section group. The objective function means, for example, minimizing supply disruption, averaging reserve capacity of each distribution line after interchange power transmission, and the like.

Here, the function (accommodation calculation) of the conventional flexible power transmission operator CONT will be described with reference to the power distribution system diagrams of FIGS. 9 to 10. FIG. 9 shows a state at the time of soundness, and areas K1, K2, and K3 indicated by hatching are distribution section groups to be a power failure section later. Now, the distribution section groups K1, K2,
All of K3 is transmitted from the distribution line Fx, and the distribution lines F1, F2, F2, K2 adjacent to these distribution section groups K1, K2, K3,
The reserve capacity of F3 is F1: 50 [A] and F2: 60, respectively.
It is assumed that [A] and F3: 10 [A]. It should be noted that in the figure, the symbols of the switches are indicated by black circles, while those indicated by white circles are in the open state.

Now, in the state of FIG. 9, the distribution line F
An accident has occurred in the distribution section group Kx of x, or the distribution line Fx is overloaded, and the distribution section groups K1, K2, K3
When the switch SWx is opened, the power distribution sections K1, K2, K3 are all blacked out as shown in FIG. Then, the interchange power transmission operation unit CONT determines the power failure section group K.
Magnitude of section load of 1, K2, K3 (K1: 30 [A],
K2: 20 [A], K3: 10 [A]), reserves of distribution lines adjacent to these distribution sections (F1: 50 [A], F2: 60)
[A], F3: 10 [A]), switches SW1 to SW3, S
Flexible calculation is performed based on the online information of the status signals of W4 to SW6.

The flexible calculation will be described below with reference to a table. First, when starting the calculation of accommodation to the power failure sections K1, K2 and K3, all the switches SW1 to SW6 which can be directly connected to the power failure section groups K1, K2 and K3 are virtually opened. Next, power failure section groups K1, K2, K3
Are arranged in ascending order of section load (Table 1).

[Table 1] When it is assumed that the distribution lines F1 to F3 have transmitted the power to the blackout section groups K1 to K3 by ignoring the actual connection state between the distribution sections and using only the size of the section load as a determination factor.
It is determined how many sections each of the distribution lines F1 to F3 can transmit. The results of this judgment are shown in Table 2.

[0008]

[Table 2] Then, the given number of blackout sections is α (α = 3 in this case)
Then, using the formula α ≧ a ₁ + a ₂ + a ₃ = Σai, the combination of the number of transmission sections a i of each distribution line is obtained, and this is shown in Table 3.
And However, 0 ≦ a ₁ ≦ a ₁ max, 0 ≦ a ₂ ≦ a ₂ ma
x, 0 ≦ a ₃ ≦ a ₃ max

[0009]

[Table 3] From Table 3, for each combination of a ₁ , a ₂ and a ₃ within the range where the constraint conditions on the system connection and the total load of the sections to be accommodated do not exceed the reserve capacity of the interchange side distribution lines F1 to F3. Determine a flexible zone. This determined combination of the interchange sections is shown as a pattern (Table 4).

[0010]

[Table 4]

In Table 4, patterns (7), (11),
As in (17) and (21), one section K1 to K3 is simultaneously 2
Since it is not a practical solution when power is exchanged from one distribution line, an asterisk (*) is added to exclude it in the subsequent calculations. Next, each pattern has an objective function (for example, minimizing supply disruption,
It is evaluated whether or not the average degree K _P of reserve capacity of each distribution line after the accommodation is minimized). Table 5 shows the indicators for evaluation
As shown in. The average degree K _P is calculated from the following equation. Here, Fi _YB is the reserve capacity after the flexible transmission of the distribution line i.

[0012]

[Table 5]

In view of the objective functions of minimizing the supply hindrance and minimizing the average degree K _P from Table 5, the pattern (12) is the optimum solution. Next, the evaluation of the passing current is performed. In the following, description will be given using the pattern (12) and the pattern (19) obtained as the optimum solution in terms of the reserve force uniformity. Regarding the passing current of distribution lines Since the passing current of the section and the allowable passing current of the distribution lines that make up the circuit are provided for each span, the distribution system shown in Fig. 10 is shown in order to explain in span units. 7, it is assumed that the passing current through each span is as shown in Table 6. Based on this, the passing current and the allowable passing current value of the spans that form the section are set in patterns (12) and (19), respectively.
Is shown in Table 7. According to the table 7, the current passing through the span k ₁₀ of the section K2 of the pattern (12) is, exceeds the allowable passing current value. This results in pattern (12)
Is excluded from the candidates for the optimal solution. Therefore, when the evaluation in terms of passing current is added, it is calculated that the pattern (19) is a better interchange power transmission pattern.

[0014]

[Table 6]

[0015]

[Table 7]

Here, with respect to the evaluation of the passing current, an example in the case where there is a common span serving as a common supply path for a plurality of sections will be specifically described with reference to FIG. In the power distribution system in FIG. 11, sections K1 to K6 are set as the accommodation target sections, and the accommodation calculation is performed as described above. Conventionally, when determining whether the passing current in a section is within the allowable value, each SW has an allowable passing current value. What is the allowable passing current value?
Determined from the rated current of the SW itself and the allowable value of the passing current depending on the material and size of the distribution line for each span. In this case, each S
The span for W is given by the spans at both ends of the SW and the common spans (k ₅ , k _{8 in} FIG. 11). Span k in Fig. 11
Spans that do not directly belong to SW, such as ₅ and k ₈ ,
Power supply SW and branch SW belonging to the section as a common span
It is a factor that determines the allowable passing current value for all the SWs. This is shown in Table 8.

[0017]

[Table 8] It is assumed that the passing current value and the allowable passing current value in the span in each section of the distribution system shown in FIG. 11 are as shown in Table 9. According to this table, since the current passing through the common span K5 in the section K2 exceeds the allowable passing current value, the flexible transmission cannot be performed even though F1 has a reserve capacity.

[0018]

[Table 9]

[0019]

In the main line which is the main supply path of the distribution line which constitutes the distribution system in FIG. 11, the allowable passing current capacity has a margin, but the passing current is the allowable passing current of the common diameter. Constrained by value.
Further, when it is determined whether the passing current for each distribution line section is within the allowable value, it is determined that the common span belongs to all the SWs, and therefore it takes time to process. In order to solve this, in recent years, storage means for storing the allowable passing current values of all the distribution lines constituting the distribution system and online information such as classification switches, and the load side SW for each span of the high voltage line in the distribution system. Load side SW recognition means for recognizing
A passing current judging means for calculating a passing current in each section using values from the storage means and the load side SW recognizing means, and judging whether this passing current is equal to or less than an allowable passing current of the section;
A power system operating device has been proposed that is configured to determine the optimum accommodation operation procedure by adding the determination condition of the passing current determination means in the pattern determination for the accommodation calculation, but there is a change in the equipment that constitutes the distribution system. Each time,
The allowable passing current of each section is calculated and given to the load side SW, and this processing time is required every time maintenance is performed due to equipment change. The present invention has been made in view of the above circumstances, and it is possible to perform facility change maintenance in a short time by performing the calculation of the allowable passing current of the high-voltage line, which is performed each time maintenance is performed, as necessary. , It is intended to provide an operating device for a power system.

[0020]

In order to achieve the above object, the present invention provides a storage means for storing on-line information such as allowable passing current values of all distribution lines constituting a distribution system and partition switches, and the distribution system. In, the load side SW recognizing means for recognizing the load side SW for each span of the high voltage line, and the passing current in each section is calculated using the values from the storage means and the load side SW recognizing means. A passing current judging means for judging whether the value is equal to or less than an allowable passing current of the section, and a pattern of performing the interchange calculation, the judgment conditions of the passing current judging means are added, and an operating device of an electric power system configured to decide an optimum accommodating operation procedure. In addition, the configuration is such that a means for determining whether or not the allowable passing current value of the distribution line is required due to the equipment change of the power system and an allowable passing current value creating means are added.

[Operation] Whether or not the power system equipment is changed is determined by the necessity / unnecessity determination means for calculating the allowable passing current value of the high voltage line,
If it is determined to be necessary, the high voltage line passing current allowable value is calculated, and if it is determined to be no, the high voltage line passing current allowable value is not calculated and the previous value is maintained. When performing the interchange power transmission to the concession section, the passing current determination means, when determining whether the passage process for each distribution line section after the accommodation is within the allowable value, the high voltage line passing current allowable value of the common span is The passing current determination is performed by adding a load side SW recognition means so that the load side SW has the span. The accommodating means determines the calculation accommodating procedure based on this, and performs accommodating power transmission.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration example of an operating device for a power system of the present invention. The interchange power transmission operation unit 1 (CONT) calculates the passing current in each section every time it determines the load side SW recognition means 1C that recognizes the load side SW for each span and the pattern of the power transmission form, and determines whether the current is less than or equal to a predetermined value. Passing current determination means 1B for determining
Based on the result of the flexible calculation including the condition for determining the passing current, the flexible power transmission means 1A for sending the operation command of the section switch through the teleconverter master station TCo. Further, it is provided with a storage device 2 for storing the allowable passing current value of each section referred to by the passage processing judging means 1B, and a console Desk for operation by an operator.

Further, a permissible passing current value calculation necessity determining means 1D for determining whether or not to calculate the permissible passing current value when there is a facility change such as a new installation, a change, or a removal in the power system equipment,
This allows the allowable passing current value creating means 1E for creating the allowable passing current value when it is determined that the calculation is necessary. FIG. 2 shows an example of how to hold the allowable passing current value of each section in the storage device 2 described above. K1n in the figure is a value of the permissible passing current between the diameters of the distribution section K1 as shown in FIG. 4 described later. This permissible passing current value depends on the span facility that constitutes the section. Therefore, if there is a change in span equipment (wire type, wire size, constant length, etc.),
Also, if there is a change in the spans that make up the section due to new installation or removal of the switch, etc., the allowable passing current value will be calculated. The permissible current value for the span does not change when the switch name, time limit, new customer installation or removal, etc. Therefore, it is not necessary to calculate the allowable current value. The means for determining whether or not the allowable passing current value needs to be calculated in accordance with such a facility change is the allowable passing current value calculation necessity determining means 1D. Only when it is determined that it is necessary or not, the allowable passing current value creating means 1E creates the allowable passing current value of each section shown in FIG. The calculation of the allowable passing current value is performed using the allowable passing current value calculation necessity determining means, but this is performed externally (for example, from the CRT screen, the information of necessity of calculating the allowable passing current value is displayed). In some cases, it may be performed by obtaining information on whether or not the calculation is required.

Next, the operation of the operating device for the electric power system having the above-mentioned configuration will be described. First, the case where the line size of the span K13 and the name of the switch SW2 in FIG. 4 are changed will be described as an example. When the power system equipment is changed, the changed content is stored in the maintenance item table shown in FIG. To change the span K13, change the work type to maintenance item 1
Equipment type = high voltage line, and change of switch SW2 is stored in maintenance item 2 as work type = change, equipment type = switch. The number of maintenance items is stored as 2. FIG. 13 is an allowable pass current calculation necessity table, which defines whether the allowable pass current is calculated or not, corresponding to the construction type and facility type. O in the figure is defined as requiring calculation, and x in the figure is defined as not requiring calculation. Based on the maintenance item, the allowable passing current value calculation necessity judgment means for judging whether or not the allowable passing current value calculation is necessary, and the allowable passing current value creation means are passed if the judgment result shows that the allowable passing current value has not been calculated. The processing will be described with reference to the processing flow of FIG.

In step ST31, the number of maintenance items is fetched from the maintenance item table of FIG. 12, and this is set as the number of times m the process is repeated. In step ST32, maintenance item i to maintenance item m are repeated. The initial value of i is 1. Step ST33
Retrieves the construction type and equipment type of maintenance item i from the maintenance item table of FIG. When i = 1, the maintenance item for the span K13 is stored as the maintenance item. Therefore, the extracted maintenance items are construction type = change, equipment type = high voltage line. Also i
= 2, the maintenance item of the switch SW2 is stored as the maintenance item. Therefore, the extracted maintenance items are construction type = change, equipment type = switch. In step ST34, the allowable passing current calculation necessity table of FIG. 13 which is defined in advance is referred to from the extracted construction type and equipment type, and the defined calculation necessity information is extracted.

When i = 1, the construction type = change, the equipment type = high voltage line, and referring to the necessity / non-necessity of the allowable passing current calculation in FIG. 13 with this information, the definition information is the calculation necessity (construction type and equipment). Information defined at the intersection of the two-dimensional matrix of the type). When i = 2, construction type = change, equipment type =
This is a switch, and the definition information is calculation failure when the necessity of calculating the allowable passing current in FIG. 13 is referred to with this information. Next, in step ST35, the flow of processing is divided into two according to the definition information referred to in step ST34. If the referred definition information requires calculation, the process proceeds to the next step ST36, and if the referred definition information does not indicate calculation, the processes of steps ST36 to ST40 are bypassed. Therefore, when the maintenance item i = 1, the definition information is required to be calculated, and the process proceeds to step ST36. Further, when the maintenance item i = 2, the definition information is unacceptable and the processes of steps ST36 to ST40 are bypassed.

In step ST36, the number of spans forming the section to which the maintenance span belongs is taken out from the table shown in FIG. When the maintenance item i = 1, the span K13 is changed, and n = 4 is taken out as the number of spans forming the section K1 to which this span belongs. Step S
At T37, the number of spans n taken out is stored as the number of spans forming the section to which the span belongs. Next, in step ST38, the number of spans n stored in step ST37 is set as the number of times of repeating the process, and the process for the number of spans forming the section to which the maintenance span belongs is repeated. Repeat from ii = 1 to n (in this example, the maintenance span K13 is changed and n = 4). In step ST39, the line type, the line size, and the constant length of the span ii forming the belonging section of the maintenance span are given to a predetermined calculation formula to calculate the passage allowable current value of the span ii. Next, in step ST40, the passage allowable current value calculated in step ST39 is stored in the table shown in FIG. Next, ii is updated (ii = ii + 1). If ii is less than n, the process returns to step ST38 and repeats the processing.
Up to this point, the determination as to whether or not it is necessary to calculate the permissible passage current value of the spans constituting each belonging section of the high voltage line due to the facility change of the power system has been described. Next, the operation for obtaining the flexible power transmission path using this passage allowable current value will also be described.

First, the operation flow of the passing current judging means 1B is shown in FIG. In step ST1, the teleconverter master station T
Based on the online information from Co, the transmission current of the distribution line instructed by the interchange power transmission means 1A is obtained, and this is stored and stored as the passing current of the first section of the distribution line. Step ST
In 2, the section for transmitting the designated distribution line and the SW connected to each section are obtained and stored in the work area.
Then, in the DO loop of steps ST3 to ST6, the calculation of the passing current for the number of power transmission sections obtained in step ST2 and the determination as to whether this is the allowable value or less are repeated. The steps ST4 and ST5 will be described in detail with reference to the flow chart of FIG. In step ST9, the following steps ST10 to ST15 are repeated by the number of branches SW included in the section I. In step ST10, the power switch SW in section I and step S
Find the current that flows between (routes) SWJ determined by the DO loop of T9. As shown in FIG. 4, the current flowing between SW1 and SW2 is obtained by dividing the power consumption in the sections K3, K5, and K6 and the power consumption in the section K2 by the branch number 2.
Although these are added to increase the accuracy, they are omitted here for convenience of explanation.

Next, in step ST11, the number of spans forming the section I is set to m, and in step ST12, the passing current i in the section I and the passing current in the span are compared. As a result, when the passing current (i)> the allowable passing current of the span (JJ), the DO loop of steps ST12 to ST14 is escaped,
The process moves to step ST17. If the above conditions are not satisfied, the processes of steps ST12 to ST14 are repeated m times, and then the process proceeds to step ST16. In steps ST16 and ST17, it is respectively a step of outputting whether the given passing current of the section I is smaller or larger than the allowable passing current value.

The above-described processing of FIG. 5 is the detailed processing of the passing current calculation in step ST4 of FIG. As a result of this determination, step ST15 proceeds to step ST6 when it is determined that the passing current is smaller than the allowable passing current value, and proceeds to step ST8 when it is determined to be large. Step ST6 is a continuation of the DO loop with respect to step ST3,
Step S until execution for all transmission sections is completed
Return to T3, and if completed, proceed to step ST7. In step ST7, the result that the passing current is within the allowable passing current value is output to the interchange power transmitting means 1A of FIG.
On the contrary, in step ST8, the result that the value is equal to or larger than the allowable passing current value is output.

In the operating device of the electric power system including the above-mentioned flexible power transmission operation device, the flexible power transmission means when a system fault occurs.
1A starts, and in FIG. 6, based on information such as switching status signals of switches based on online, connection information between classification switches and distribution section, reserve capacity of distribution line, preset section size, etc. Perform flexible calculations. That is, a command is sent in step ST19 each time the interchange pattern is determined, and it is determined for each distribution line whether or not the passage current is within the allowable passage current value for all sections transmitted from the distribution line. Start processing. Step ST20
In, the passing current determination means 1B is the load side SW recognition means
The data from 1C is read from the storage device.
In step ST21, the completion of the determination is waited, and in step ST22, it is determined whether or not the pattern satisfies the passing current condition. As a result, patterns that do not satisfy the passing current condition are excluded from the candidates for the optimal solution,
The pattern that satisfies the passing current condition is selected from the rest as the optimum solution.

Next, the above-mentioned processing contents will be concretely described with reference to FIG. When performing flexible power transmission in the interval K1 ～K6, for allowable passing current value small in span k ₅ in the conventional example described above, could not be carried reserve of F1, flexibility operation utilizing permissible passing current of mains However, in the above-described embodiment, since the permissible passing current value of the common span for the passing current of the distribution line is provided only to the load side SW, effective interchange power transmission can be performed. Table 10 shows the factors that determine the distribution line passing current. According to this, the trunk lines (k ₁ , k ₂ , K ₃ ,
Flexible power transmission to k ₄ ) can be performed regardless of the allowable passing current value of the span k ₅ .

[0032]

[Table 10]

In the above description, the flexible operation when an accident occurs in the power distribution system has been described. However, the present invention is not limited to the above embodiment, and the operator works on a power distribution section of a certain distribution line. The same can be applied when a power outage occurs or when a distribution line is overloaded. In the former case, the interchange power transmission operation unit CONT may have a function of determining the concession section based on the work power failure command from the operator, and in the latter case, it should be separated from the automatic detection of the overload. It suffices to have a state in which the section can be determined.

[0034]

As described above, according to the present invention, the allowable passage process of the distribution line is created during maintenance.
In order to prevent the distribution line allowable current creation process from being performed when there is no effect on the distribution line allowable current by providing a function to determine whether or not the change in the power equipment affects the distribution line allowable current Thus, it is possible to provide an operating device of a power system capable of shortening the maintenance processing time.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of how to hold allowable passing current information for each span of each section in the storage device in the embodiment of FIG.

FIG. 3 is an operation flow chart of the passing current determining means of the embodiment of FIG.

FIG. 4 is an exemplary system configuration diagram of a distribution line for explaining the operation of the embodiment of FIG.

5 is a flow chart of the optimum processing of the passing current in the embodiment of FIG.

6 is a flowchart for explaining the function of the power transmission accommodation means in the embodiment of FIG.

FIG. 7 is a system configuration diagram for specifically explaining a span.

FIG. 8 is a configuration block diagram of a conventional example.

FIG. 9 is a system configuration diagram in a healthy state.

[Figure 10] System configuration diagram during a power failure.

FIG. 11 is a system configuration diagram for explaining a common span of the present embodiment.

FIG. 12 is a diagram showing an example of a table prepared to store maintenance items associated with a power system facility change in the embodiment of FIG. 1.

FIG. 13 is a table showing whether or not the allowable passing current is calculated.

FIG. 14 is a diagram showing a processing flow for explaining the function of determining whether or not to allow passage of current in the embodiment shown in FIG. 1;

[Explanation of symbols]

 1 Flexible power transmission operation device 1A Flexible power transmission means 1B Passing current judgment means 1C Load side recognition means 2 Memory device TCo Signal transmission device (master station) Fi, Fx Distribution line Ki Distribution area SWi Classification switch Kij Distribution span

Claims (1)

[Claims] 1. A switching status signal of a feeder circuit breaker of a distribution system, a distribution line is divided into a plurality of sections, or a switching status signal of a classification switch for interconnecting distribution lines, a load current signal of each distribution line, in advance. The section load current signal that is set or acquired online using the remote monitoring and control device, and the connection information that indicates how the distribution sections are connected to each other is used to operate the distribution system and When the interchange procedure is performed so that the concession transmission that occurs depending on the open circuit is performed from another distribution line and the passing current of each distribution section after accommodation is within the allowable value, In the operating device of the power system in which the allowable passing current value is given to the load side and the section switch is operated based on the accommodation calculation result, due to the change (new installation / removal / change) of the power system equipment. If it is determined that there is no effect, the means for not creating the distribution line allowable passing current is taken. A power system operating device characterized by being provided.