JPS609331A - Tide calculating system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This invention enables
A power flow calculation method that calculates the amount of power that can be newly supplied from the target bus via a specific plurality of bus lines % Formula % As this type of method, computer processing as shown in the flowchart in Figure 1 has been proposed. . In FIG. 1, processing block 1 sets a unit load only to the bus of interest, and sets all other power generation amounts and load amounts to zero.

Subsequently, processing block 2 calculates the power flow of the power system, that is, the unit load power flow, based on the power generation amount and load amount set in processing block 1. On the other hand, processing block 6 performs 1. Use the power system power flow value χ measurement calculation estimation or preliminary calculation. Processing block 4 uses the power flow values determined in processing blocks 2 and 6 to calculate the amount of power that can be newly supplied from the target bus without overloading each power facility.

This conventional power flow calculation method has a major drawback in that it is only possible to determine the range of power consumption when the target bus is one bus, and it is not possible to determine the range of power consumption when multiple buses are focused. .

This invention was made to eliminate the drawbacks of the conventional power flow calculation method as described above, and when there are multiple buses of interest and power is supplied from the plurality of buses of interest at the same time, Assume a power system with a unit load set at , and other power generation and load amounts set to zero. Next, perform power flow calculation 7 using the DC flow method for this TE power system, and find the power flow (unit load flow) for each power facility and the phase angle (unit load phase angle) of each bus of interest. Furthermore, the space connecting the bus of interest and the bus that is supplied from the bus of interest to the ring ring,
Power equipment impedance, unit load current and 7N 6r
By solving a predetermined linear equation using the negative load phase angle, we can find the tidal flow rate when the target bus line and the supplied bus line intersect, and by solving a similar linear equation, we can find the supplied bus line. Determine the power flow state when the unit load is set to .

From these power flow conditions and the power flow values of each equipment in the power system,
The purpose of this invention is to provide a power flow calculation method for calculating the amount of power that can be newly supplied from a plurality of focused buses.

Hereinafter, one embodiment of the present invention will be described with reference to FIG. 2.

In FIG. 2, processing block 1 focuses on a plurality of specific buses that can supply power to a specific system, and sequentially sets a unit load for each of the buses of interest, and also sets a unit load for each of the buses of interest. The power generation amount and load are set to zero, and the unit load flow and single load phase angle of the power system are calculated. Next, processing block 2 performs power flow calculation 7 only for the bus of interest and the power equipment connected to the bus to which electricity is supplied from the bus of interest.

Power flow value up to the position immediately before the supplied bus line and immediately before σ')
(The phase angle at The equation χ is created.Processing block 4 then solves the simultaneous equations created in block 6 and calculates the flow power for each of the power equipment from the plurality of target buses to the bus that is supplied to the ring. 'Siru j side stream 1st shift,
At that time, we calculate the phase angle at the 1σ line that supplies the light force. In processing block 5, in the simultaneous equations created in processing block 6, the phase angle obtained in processing block 2 is set to zero, and a unit load is set on the bus line fed by the ring can]! b Solve the equation and calculate the unit load phase angle of the bus of interest and the unit load power flow of the power equipment connected to the bus of interest and the bus that is supplied from the ring. Processing block 6 measures and calculates the power flow value of the power system to which the target bus is connected.

Based on estimation or prediction. Processing block 7 corrects the power flow value determined in processing block 6 by using the power flow flowing into the bus to which power is supplied, determined in processing block 4, and the unit load power flow determined in processing block 1. conduct. Processing block 8 uses the unit load flow determined by processing block 5 to
Modify the unit load flow determined in processing block 1. Next, in processing block 9, the power flow value determined in processing block 7 and the unit load power flow corrected in processing block 8 are calculated. Using this method, we calculate the wattmeter that can be newly supplied from a plurality of target buses without overloading each power facility.

The power flow calculation operation shown in FIG. 2 will be explained in the case where there are two buses of interest. FIG. 3 will be explained using an example of a system that is a system configuration diagram consisting of a bus of interest and buses to which electric power is supplied from these buses. In FIG. 3, the bus of interest 111 and the bus of interest 212 are connected to the Kaisei line 13 via a power transmission line 114 and a power transmission line 215. At this time, the switches 16 and 19 are in the closed state, and the switches 17 and 18 are in the open state.

In processing block 1, first, a unit load is set on the focused bus 111, and the other power generation amounts and load amounts are set to zero, and the unit load power flow and unit load phase angle are determined. 2120 units load phase angle θ
1. shall be. Next, the same process 7 is performed for the first bus 212 of interest, and the unit load phase angle θ781 of the bus 111 of interest is
Observed bus line 2120 unit load phase angle θ2. shall be.

Next, in processing block 2, a power flow calculation is performed only for the power transmission line 114, and the phase angle n immediately before the load bus 16 of the power transmission line 14 is determined, and this is set as φ1. Similarly, a power flow calculation is performed for the power transmission line 215, and the γ phase angle is calculated to be φ.

FIG. 4 is a system configuration diagram showing the processing of this processing block 2.

Furthermore, in processing block 6, the power transmission line 11 is connected with the switches 16 and 17 logically set as 1 closed 1, as shown in the system configuration factor shown in FIG.
4 and sending fii1M215 and 7 flowing current χ p, respectively.
, 13. Then, the following formula is derived. 1. f
lchi, φ++ O++ ” P++θ, 7・Pt−X,・P,
=θo ””” (+)φ, 102.・p, 106.・
p, -x, ·P2-θ.・・・・・・−・ (2) Here,
X, ,X, are respectively the transmission Tn4 wires 114. Okuki Line 215
impedance, also θ. is r)'l of the load bus 16
l There is a negative angle. In addition, the power flows Pl, P of the power transmission line 14.15,
has the following relationship.

P, + 1', = o -・・・・・・・・・・・・・
...(3) Then, (11, +21, (31), the following 0 formula is derived.

Next, for the load mother/1113, the transmission '1' when an additional unit load of 4 is given as shown in Fig. 6 as shown in Figure 6.
Part 1 of F1 line 114 and power transmission line 215. Assuming that the change in the power flow (it'& ΔP, JP) and the change in the phase angle of the load bus 16 Δθ0, the following equation is derived.

θ11・ΔP, 108.・ΔP2−X, ・Δp, = Δθ
. ...... (5) θ7.・ΔP, +02.・Δ
P, -X, · Δp, = Δθ.・・・・・・(6)Δ
P, +ΔP, = 1.0 ・・・・・・・・・・・・ (
7) Derive the following equation from equations (51, (6), and (7) above).

In processing block 4, the currents P, , P in equation (4) are
2. Orientation angle θ. Obtain by solving the following equation Z.

In processing block 5, the power flow θ) change meter ii in equation (8)
l'+.

The amount of change Δθ0 in the ΔP and Pt angles can be obtained by solving the following equation.

Furthermore, in processing block 7, in processing block 4 (9
) The power flow P, , P given by the formula, and the load flow determined by processing block 1 (s'L *load flow), the power flow value of the 1111 power system in processing block 6 is 4+'s iF.Electric power To correct the power flow of the power system, the medium load power flow stored in the layer bus 111 is multiplied by Pl, and this is added to the power flow value of the power system stored in the f'Lχ processing block 6.

Similarly, focus on the single f) r load current that f) is 212 tc. This is done by adding the power flow value of the electric power system.

Next place 311! In block 8, the processing IJI block 5 is added (1 (number of tidal current changes Δ1゛1.Δ
Using P2, the medium load power flow χ for the bus of interest 111 and the bus of interest 212 determined in processing block 1 is corrected, and the medium load power flow for the load bus 131C is determined. The correction of the medium load power flow is performed by multiplying all the sensitivity coefficients of the power flow for the target bus 111 by ΔP1, and by multiplying the target bus 111 by ΔP1.
i: Regarding the line 212, it is performed by multiplying by ΔP2χ.

In processing block 9, the mother of interest (
'1111, the maximum electric power that can be newly supplied from the target bus 212 'JX: Calculate. The method for calculating the OL power amount at that time is as follows.

In the power system, the power flow flowing through each power facility 4 (i5 is proportional to the power newly supplied from the bus of interest, and there is a correlation as shown in Figure 7. In Figure 7, P is the power flow newly supplied from the bus of interest. The amount of electric power χ and fm to be supplied is 甫.

It is assumed that the current flowing through the power equipment m, flm is the current load current of the power equipment m, and f m o is the power flow of the current equipment m before the electric power is newly supplied from the target bus. Using this relationship χ,
The maximum value phr^X and minimum value PMTN of the gravimeter that can be supplied to the load system from the target bus without causing excessive overload in a healthy power system can be determined by the following equation.

fl. 〉0, f zm < 00, PMAX = M I N (PMAX7X) PMI
N ” MAX (pH<sNm) η1 Here, PMAXm is the maximum power that can be newly supplied from the focused fB line without overloading the power equipment m, -PMTNm
is the minimum power that can be newly supplied from the target bus without overloading the power equipment, and MAX G-・) is the maximum value for mvc, MIN(・-・) is the minimum value for m,
Furthermore, Fm is the equipment capacity of power equipment m.

The above process is performed for each of the target bus lines, and the maximum power that can be supplied from the target bus line is the lowest value among the maximum power obtained, and the highest value can be supplied among the small power units. 1 power.

In the above embodiment, the case where there are two buses of interest is explained, but even if there are three or more buses of interest, by performing the same process, it is possible to newly supply power from the bus of interest. You can ask for it.

As described above, according to the r>Jll outflow method of the present invention, the power flow calculation that requires multiple (σ) calculations to calculate the amount of power that can be newly supplied from the bus of the a2 number is “f!■
This only needs to be done when the bus that supplies power is new [IL], and if the bus that is supplied with power is connected to the bus that supplies power, the power flow value of the system that supplies power is Since it can be repaired by simple calculations, new power flow calculations are not required.

As mentioned above, the number of power flow calculations can be determined by the number of buses of interest in the support system, and with a small number of power flow calculations, it is possible to calculate the amount of new power χ that can be supplied without overloading the power system. This has the advantage that calculations can be made regardless of the form of the lineage.

[Brief explanation of drawings]

FIG. 1 is a processing block diagram showing a conventionally proposed power flow calculation method χ, FIG. 2 is a processing block diagram showing a power flow calculation method 2 according to an embodiment of the present invention, FIGS. 3, 4, 5, and 6 is a system configuration of a power system illustratively shown for explaining the operation of the embodiment in FIG. 2, and FIGS. 7 and 8 are characteristic diagrams of the power system. 1 to 9...processing block, 11...target generatrix 1%1
2... Focus bus 2, 16... Load bus, 14...
Power transmission line l. 15...Power transmission line 2.16, 17, 18.19...Switch. Note that the same reference numerals in the figures indicate the same parts. Agent Tai kA Masuo No. 1 Figure fR2 Procedural amendment (voluntary) Commissioner of the Japan Patent Office 1, Indication of case Japanese Patent Application No. 117510/1982 2, Invention name trend calculation method 3, Examination of the person making the amendment 5 , Subject of amendment (1) Explanation of the scope of claims in the specification (2) Column 6 of detailed explanation of the invention in the specification, Contents of amendment (1) Amend the scope of claims as shown in the attached sheet. (2) On page 2 of the specification, line 1θ, the phrase "per load amount" is corrected to read "by load amount." (3) In the 11th line of page 2 of the specification, "measurement, calculation, estimation" should be corrected to "measurement, calculation, estimation." (4) On page 5, line 18 of the specification, the phrase "Fig. 3 is" is amended to read "Fig. 3." (5) On page 8, line 9 of the specification, "θ0 is" should be replaced with "θ0".
Correct it as "0". (6) On page 8, line 14 of the specification, "Δθ0 is" is corrected to "Δθ0". (7) In the third line of page 9 of the specification, the phrase "correction of tidal current" is amended to "correction of tidal current value." (8) On page 9, line 15 of the specification, "sensitivity coefficient of power flow" is corrected to "unit load power flow." Claims after amendment: In a power flow calculation method that calculates the amount of power that can be extracted from a specific plurality of buses in the power system to a load outside the power system without overloading a power system in which the power flow state is known, By giving a unit load to each bus and setting all the power generation and load amounts of other buses to zero, connect the above buses and loads using the results of multiple power flow calculations calculated using the DC flow method. It is characterized by calculating the amount of power that can be taken out from the bus connected to the load by determining the power flow state when the unit load is connected to the bus connected to the load, and then calculating the power flow state when the unit load is connected to the bus connected to the load. A power flow calculation method.

Claims (1)

[Claims] In a power flow calculation method that calculates the amount of power that can be extracted from specific multiple buses within the system to loads outside the system without overloading the power system with known power flow conditions, a unit load is given to each bus. At the same time, the power generation amount and load amount of other buses are all set to zero, and the calculation results of multiple power flow calculations calculated by the DC flow method are used to calculate the case where each of the above buses and the bus connected to the load are connected. A power flow calculation method characterized in that the power flow state Z is determined, and then the power flow state when a unit load Y is connected to the bus connected to the load is calculated, and the amount of power that can be taken out from the bus connected to the load is calculated.・