JP6219102B2 - Power control device - Google Patents

Description

  The present invention relates to a power control apparatus that controls, for example, the voltage of a power system.

  In the current power grid, it has become common to transmit large amounts of power over a relatively long distance to demand areas in urban areas as demand scale increases, remote and uneven distribution of power sources, and wide-area operations expand. ing. On the other hand, the characteristics of the load side are changing due to an increase in the number of inverters and induction motors.

  In response to such a situation, in order to maintain the system voltage properly and prevent the voltage instability phenomenon in advance, various phase-adjusting facilities are optimally arranged in the power system. A voltage / reactive power control system is adopted.

  Examples of the voltage / reactive power control method include a central control method and an individual control method (local control method). The individual control method is divided into a time schedule operation and an individual VQC method.

  In the central control method, based on the online information of the monitoring points set at the main points of the system, direct operation from the central power supply command station etc. to the voltage / reactive power control equipment of the electric station so as to maintain the reference voltage, Manipulate.

  As a generally used technique, there is a method in which deviations with respect to a reference voltage at a plurality of voltage monitoring points are collected into one evaluation function, an operation amount of a device for minimizing this is obtained, and an operation is performed.

  As the evaluation function, the voltage deviation at the monitoring point and the minimization of the transmission loss of the monitoring transmission line are often adopted, and the sensitivity coefficient by the AC method or the sensitivity coefficient by the DC method is used as an evaluation of the effect.

  In the time schedule operation of the individual control method, the phase adjusting equipment is turned on and off according to the time, and the voltage is controlled individually by the voltage regulator relay of the transformer. The individual VQC method is to operate the phase adjusting equipment and the transformer, and there are a VV control method and a VQ control method as main control methods (see Non-Patent Document 1).

  The V-V control method integrates the deviation between the set values of the primary and secondary bus voltages and the measured values, and when the value exceeds a certain value, sends a control signal to either the transformer or the phase adjusting equipment. In this method, the voltage is controlled.

  The VQ control method integrates the difference between the secondary bus voltage and the set value of reactive power passing through the transformer and the measured value. If the value exceeds a certain value, the control signal is sent to either the transformer or the phase-adjusting equipment. Is used to control the voltage.

  Currently, the above-mentioned method is used to detect the voltage deviation at the monitoring point (control target point), maintain this at the reference value, and minimize the transmission loss so that the generator reactive power, transformer The taps and phase-adjusting equipment are controlled, but the conventional control system controls the voltage of the transmission system as falling from the substation end toward the consumer end.

  In the future, the introduction of distributed power sources (solar power generation, wind power generation, etc.) as a measure against global warming is expected to increase, and when the power flow in the transmission line changes, the voltage distribution will become higher at the consumer end. Different voltage management methods are required.

  In particular, it is necessary to select a transformer tap of a substation where a plurality of transmission lines are connected to the secondary side of the transformer, considering that the voltage distribution of each transmission system is greatly different.

  As a technique for managing the voltage of the power system in consideration of the introduction of the distributed power source, for example, a technique for managing the power supply side (see Patent Document 1) and a technique for controlling the distribution system (see Patent Document 2) have already been disclosed. However, all of them control nearby equipment using system measurement information, and are not suitable for voltage management of customers who do not have measurement values or voltage management of multiple power transmission systems.

IEEJ Technical Report No. 743 “Voltage and Reactive Power Control of Power System” IEEJ Power and Energy Division High Voltage Technical Committee (P37-P40)

JP 2012-249500 A JP 2012-249487 A

  The present invention has been made in order to solve the above-described problems. In consideration of the existence of a distributed power source in the transmission system, the voltage reached to the customer in the transmission system is set within the management range, and An object of the present invention is to provide a power control apparatus capable of managing the voltage of the entire power system from the place to the consumer end.

The power control device of the present invention is a voltage control device that controls the voltage of a power system including a power supply system that supplies power to a consumer, and a power transmission system that connects the power supply system and the consumer via a power transmission line. A measurement unit, a system information storage unit, an estimation calculation unit, a voltage calculation unit, a temporary control amount determination unit, an evaluation unit, and a transmission unit. The measurement unit measures the power and voltage of the power feeding system. The system information storage unit stores system information including configurations of devices connected to the power feeding system and the power transmission system. The estimation calculation section by using the system information stored in the system information storage unit and the information of the measured power feeding system by the measuring unit, estimates calculates the load amount and the power generation amount before Ki需 main house. The control amount the voltage calculation unit for controlling the voltage of the estimate calculating part load before Ki需 main house calculated by the power generation amount and the transmission grid, the voltage of the power supply system and the voltage of the customer calculate. The temporary control amount determining unit by using a voltage and the customer of the voltage of the power supply system that has been calculated by the voltage calculation unit, a control amount such as voltage is within the tolerance range of the power transmission system is provisionally determined, The voltage calculation unit is caused to recalculate the voltage of the power supply system and / or the customer with the temporarily determined control amount. The evaluation unit evaluates whether or not the voltage of the power supply system and the voltage of the customer recalculated by the temporary control amount determination unit are appropriate based on a preset evaluation condition, and based on an evaluation result, The control amount of the voltage to the power transmission system is determined. The transmission unit transmits the control amount determined by the evaluation unit as a regular control amount to the voltage / reactive power adjustment device of the transmission system to be adjusted.

It is a figure which shows the structure of the electric power grid voltage control system of 1st Embodiment. It is a figure which shows the memory content of a system | strain information database. It is a flowchart which shows the calculation operation | movement of control amount. It is a flowchart of the average voltage adjustment operation | movement in 1st Embodiment. (A) is a figure which shows an example of the stepwise evaluation of a substation voltage. (B) is a figure which shows an example of the stepwise evaluation of a consumer voltage. It is a figure which shows the voltage evaluation of the consumer in each power transmission system. It is a figure which shows an example of the evaluation method of an ultimate voltage. It is a figure which shows an example of a condition table. It is a flowchart which shows the voltage adjustment operation | movement of a power transmission system. It is a figure which shows the voltage evaluation of the consumer in each power transmission system. It is a figure which shows an example of the evaluation method of an ultimate voltage. It is a figure which shows the structure of the electric power grid voltage control system of 2nd Embodiment. It is a figure which shows the structure of the electric power grid voltage control system of 3rd Embodiment. It is a flowchart which shows operation | movement of the power transmission system voltage adjustment part in 3rd Embodiment. It is a figure which shows an example of a condition table. It is a figure which shows the structure of the electric power grid voltage control system of 4th Embodiment. It is a figure which shows the structure of the electric power grid voltage control system of 5th Embodiment. It is a figure which shows the structure of the electric power grid voltage control system of 6th Embodiment. It is a figure which shows the structure of the electric power grid voltage control system of 7th Embodiment. It is a figure which shows the structure of the electric power grid voltage control system of 8th Embodiment. It is a figure which shows the structure of the power system voltage control system of 9th Embodiment.

Hereinafter, the power system voltage control system of each embodiment will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram illustrating a configuration of a power system voltage control system according to an embodiment.
As shown in FIG. 1, the power system voltage control system of the first embodiment includes a transformer 21 provided in a substation 20 and one or more power transmission systems 26 a, 26 b connected to the transformer 21. 26c and the voltage control apparatus 101 connected to these power transmission systems 26a, 26b, and 26c.

  The transformer 21 is a load tap switching transformer, and can change (adjust) the voltage of the power transmission system by switching multi-stage (such as five stages) taps. The transformer 21 is one of the substation facilities on the substation 20 side, and is a voltage / reactive power adjusting device that adjusts the voltage at the substation 20. Substation facilities such as the transformer 21 and power transmission lines installed in the substation 20 are collectively referred to as a power feeding system. The power supply system also includes power facilities (such as power generation facilities and substation facilities) in places other than the substation 20.

  The power transmission system 26a includes a circuit breaker 22a, a customer 25, an SC / ShR 23, a distributed power source 27, and the like, and these devices are connected by a power transmission line 24a. The circuit breaker 22 a is connected to the transformer 21 of the substation 20. The SC / ShR 23 is a voltage / reactive power adjusting device for adjusting the voltage of the power transmission system 26a. SC is a power capacitor, ShR23 is a shunt reactor, and these are phase adjusting equipments.

  The distributed power source 27 is described as “DG” in the drawing. The distributed power source 27 is a photovoltaic power generation (PV), a wind power generation, and a generator, and includes those introduced on the customer 25 side.

  The power transmission system 26b includes a circuit breaker 22b, a customer 25, an SC / ShR 23, a distributed power source 27, and the like, and these devices are connected by a power transmission line 24b. The circuit breaker 22 b is connected to the transformer 21 of the substation 20.

  The power transmission system 26c includes a circuit breaker 22c, a customer 25, an SC / ShR 23, a distributed power source 27, and the like, and these devices are connected by a power transmission line 24c. The circuit breaker 22 c is connected to the transformer 21 of the substation 20.

  The voltage control apparatus 101 includes a state measurement unit 1, a system state estimation unit 2, a voltage calculation unit 3, an average voltage adjustment unit 4, a power transmission system voltage adjustment unit 5, a system information database 6 (hereinafter referred to as “system information DB 6”), A voltage / reactive power adjustment device control amount transmission unit 7 and the like are included.

  The voltage control apparatus 101 connects the transformer 21 (transformer equipment) of the substation 20 that supplies power to the consumer 25, and the transformer 21 (transformer equipment) and the customer 25 of the substation 20 to the transmission lines 24a, 24b, It is an apparatus for controlling the voltage of a power system including power transmission systems 26a, 26b, and 26c connected via 24c.

  The state measurement unit 1 includes a power / voltage measurement unit 8, a tap measurement unit 9, an SC / ShR state measurement unit 10, a measurement information processing unit 11, and the like.

  The power / voltage measuring unit 8 measures the voltage at the end of the substation of the power transmission systems 26a, 26b, 26c and the active power / reactive power. The power / voltage measurement unit 8 may obtain the power from the voltage, current, and power factor measurement results instead of the voltage and active power / reactive power.

  The tap measuring unit 9 detects the current tap state of the transformer 21. The SC / ShR state measurement unit 10 measures (detects) the on / off state of the SC / ShR 23 to be controlled.

  The measurement information processing unit 11 processes the measurement information into a method that can be used by the system state estimation unit 2. Examples of methods that can be used by the system state estimation unit 2 include digitization of analog information, averaging of numerical values, and calculation of effective values.

  That is, the state measuring unit 1 sets the state (voltage, power, SC / ShR state (on / off)) of the power transmission systems 26a, 26b, and 26c to be voltage controlled and the state (tap state) of the transformer 21 (transformer equipment), respectively. measure.

  The system state estimation unit 2 uses the transmission information 26a, from the measurement information (power / voltage, tap state, SC / ShR state (on / off)) measured by the state measurement unit 1 and the system information stored in the system information DB 6. The states of 26b and 26c are estimated (predicted calculation).

  In addition to the measurement information (voltage, power, etc. of each power transmission system 26a, 26b, 26c), the system state estimation unit 2 includes information on the devices connected to each system stored in the system information DB 6 (device configuration and each device's information). Using the state (tapped state, SC / ShR on / off state, etc.), the current configuration of the power transmission systems 26a, 26b, 26c, the load amount of the plurality of customers 25 in the power transmission system, and the power generation of the distributed power source 27 The quantity is estimated (predicted).

  That is, the system state estimation unit 2 uses the information on each system measured by the state measurement unit 1 and the system information stored in the system information DB 6 to determine the load amount of the customer 25 in each power transmission system 26a, 26b, 26c. It functions as an estimation calculation unit (prediction calculation unit) that performs estimation calculation (prediction calculation) of the power generation amount.

  As shown in FIG. 2, the system information DB 6 stores, as system information, for example, voltage upper and lower limit values 61 of the voltage management range of the power transmission system, system configuration information 62, transformer information 63, SC / ShR information 64, and the like ( Saved). The system configuration information 62 is information indicating the configuration of devices connected to the power transmission systems 26a, 26b, and 26c. That is, the system information DB 6 is a system information storage unit that stores information including the configuration of the devices connected to the power transmission systems 26a, 26b, and 26c.

  The voltage upper / lower limit value 61 is an upper / lower limit value of the voltage control target of the substation 20 and the power transmission systems 26a, 26b, 26c. The system configuration information 62 is configuration information of devices (breakers 22a to 22c, SC / ShR 23, distributed power source 27, etc.) included in each power transmission system 26a, 26b, 26c. The transformer information 63 is performance information of the transformer 21 (capacity of the transformer 21, the number of tap stages, etc.). The SC / ShR information 64 is information on the performance, setting, and status (such as on / off) of the SC / ShR 23.

  The voltage calculator 3 calculates the power transmission systems 26a, 26b from the estimated load amount of the customer 25 in each power transmission system 26a, 26b, 26c, the power generation amount, and the control amount of the transformer 21 and / or SC / ShR23. , 26c and the voltage of the transformer 21 of the substation 20 are calculated.

  The average voltage adjustment unit 4 and the transmission system voltage adjustment unit 5 use the voltage calculated by the voltage calculation unit 3 and the information in the system information DB 6 to control the amount of control of the transformer 21 (transformer equipment) (tap change command, current status maintenance, etc. ) And SC / ShR control amounts (SC / ShR23 on / off) of the transmission systems 26a, 26b, and 26c to be adjusted are provisionally determined and passed to the voltage calculation unit 3, and the average voltage of the system with the temporarily determined control amount It functions as a temporary control amount determination unit that recalculates. The average voltage adjustment unit 4 provisionally determines a tap control amount such that the average voltage of the power transmission systems 26a, 26b, and 26c is within an allowable range.

  When the average voltage of the system falls within a suitable range due to a change in voltage before and after the provisional determination, the average voltage adjustment unit 4 determines as a regular control amount, and sends the determined control amount to the transmission system voltage adjustment unit 5. The average voltage of the target power transmission systems 26a, 26b, and 26c is adjusted. That is, the average voltage adjustment unit 4 determines the tap control amount of the transformer 21 according to the condition table 50 (see FIG. 8).

  The power transmission system voltage adjustment unit 5 uses the voltage calculated by the voltage calculation unit 3 and the information in the system information DB 6 to determine the SC / ShR control amount (SC / ShR 23 on / off) of the target power transmission system 26a, 26b, 26c. Temporarily determined and passed to the voltage calculation unit 3 to recalculate the system voltage with the temporarily determined control amount, and when the system voltage falls within a suitable range due to a change in voltage before and after the provisional determination, regular SC / ShR Determined as a controlled variable.

  The power transmission system voltage adjustment unit 5 adjusts the tap control amount (tap change command, current status maintenance, etc.) and SC / ShR control amount (SC / ShR23 on / off, etc.) received from the average voltage adjustment unit 4 as voltage / reactive power adjustment. By passing it to the device control amount transmission unit 7 and sending it to the voltage / reactive power adjustment device (SC / ShR 23, transformer 21 etc.) of the system to be controlled through the voltage / reactive power adjustment device control amount transmission unit 7, each system ( The voltage of the power transmission systems 26a, 26b, 26c and the substation 20) is adjusted.

  The average voltage adjustment unit 4 and the transmission system voltage adjustment unit 5 determine whether or not the voltage of the transformer 21 of the substation 20 and the voltage of the transmission systems 26a, 26b, and 26c calculated or recalculated by the voltage calculation unit 3 are appropriate. It functions as an evaluation unit that evaluates based on a preset evaluation condition (condition table 50 in FIG. 8) and determines the control amount of the transformer 21 and / or SC / ShR 23 based on the evaluation result. The evaluation unit sets a transmission system whose voltage evaluation level is outside a predetermined level as a control amount adjustment target. The control amount adjustment target is, for example, a power transmission system other than the levels B, C, and D for the evaluation of the voltage reached to the customer 25.

  The voltage / reactive power adjustment device control amount transmission unit 7 includes a tap control amount transmission unit 12 and an SC / ShR control amount transmission unit 13, and controls each control amount notified from the power transmission system voltage adjustment unit 5. This is transmitted to the target voltage / reactive power adjustment device (SC / ShR 23, transformer 21 or the like). That is, the voltage / reactive power adjustment device control amount transmission unit 7 uses the control amount determined by the average voltage adjustment unit 4 and the transmission system voltage adjustment unit 5 as a normal control amount, and the voltage / reactive power adjustment device (transformer) of the system to be adjusted. Device 21 and / or SC / ShR23).

  The tap control amount transmission unit 12 transmits the tap control amount to the transformer 21. The SC / ShR control amount transmission unit 13 transmits each control amount to the SC / ShR 23 of the target power transmission system among the power transmission systems 26a, 26b, and 26c.

  Here, the power transmission systems 26a, 26b, 26c are power systems including circuit breakers 22a, 22b, 22c connected to the substation 20, power transmission lines 24a, 24b, 24c, SC / ShR 23, and customers 25. One power transmission system for each circuit breaker.

  The operation of the power system voltage control system according to the first embodiment will be described below with reference to FIGS. First, the control amount calculation operation for controlling the voltage / reactive power adjusting device will be described with reference to FIGS. FIG. 3 is a flowchart showing the control amount calculation operation.

  As shown in FIG. 3, the control amount calculation operation is performed in the order of voltage calculation (step S3), average voltage adjustment (step S4), and power transmission system voltage adjustment (step S5).

  First, the voltage calculation in step S3 will be described. The voltage calculation unit 3 calculates the substation end (transformer 21) from the current configuration of the transmission systems 26a, 26b, and 26c obtained by the system state estimation unit 2, the load amount of the customer 25, and the power generation amount of the distributed power source 27. ) And the voltage at the consumer end (the transmission line 24a reaching the consumer 25). As a calculation method, for example, an existing technique such as tidal current calculation is used.

  Next, the average voltage adjustment in step S4 will be described. The average voltage adjustment unit 4 makes a temporary determination of the tap of the transformer 21 using the calculated voltage at the substation end and the voltage at the consumer end.

  More specifically, the average voltage adjusting unit 4 evaluates the voltage of each transmission system so that the voltage of the target transmission system is within an allowable range on the average, and determines the control amount according to the evaluation, that is, the transformer 21 Decide whether to raise or lower the tap or keep the current tap.

FIG. 4 shows a flowchart of the average voltage adjustment operation of the average voltage adjustment unit 4.
As shown in FIG. 5, the average voltage adjustment unit 4 first converts the voltage at the substation end calculated by the voltage calculation unit 3 as shown in FIG. 5A by the substation voltage evaluation process (step S101). Are divided into five ranks of rank (1) to (5) for evaluation.

  Rank (3) is a voltage range within the allowable range, ranks (1) and (2) are voltage ranks outside the allowable range below the lower limit of the allowable range, and ranks (4) and (5) are The voltage rank is outside the allowable range above the allowable range upper limit.

For evaluation, the following values are read from the system information DB 6 and used.
EVTmax, EVTmin: Upper and lower limits of substation target voltage
EVTXL, EVTXU: Tolerable range of substation target voltage
EVTB: Substation target voltage (assumed value)
α1, α2: Boundary point determination coefficient

  The boundary point determination coefficient is a coefficient for determining a boundary point between the upper and lower limit values of the substation target voltage and the allowable range of the substation target voltage.

  In the voltage evaluation process for each power transmission system in step S102, the average voltage adjustment unit 4 shows the plurality of customer voltages of the power transmission systems 26a, 26b, and 26c calculated by the voltage calculation unit 3 as shown in FIG. According to the division of the voltage range, the evaluation is divided into five stages of ranks A to E, the number of each evaluation is counted for each transmission system, and the ultimate voltage is evaluated from the counted result.

  In FIG. 5B, rank C is a voltage range within the allowable range, ranks A and B are voltage ranks outside the allowable range below the allowable range lower limit, and ranks D and E are higher than the allowable range upper limit. Is a voltage rank outside the above allowable range.

  For the evaluation, the position of the customer 25 of the power transmission system and the following values are read from the system information DB 6 and used.

EVLmax, EVLmin: Upper and lower limits of customer voltage
EVLXL, EVLXU: Acceptable range of consumer voltage
EVLB: Consumer voltage (assumed value)
β1, β2: boundary point determination coefficient

  The average voltage adjusting unit 4 determines the voltage evaluation of the target power transmission system as the voltage evaluation of the target power transmission system from the result counted for each power transmission system (majority evaluation). The priority order when the most evaluations are the same is A, E, B, D, C. An example of evaluation is shown in FIG.

  In the ultimate voltage evaluation process of step S103, the average voltage adjustment unit 4 counts the evaluation of each power transmission system for each stage, and determines the ultimate voltage as the evaluation of the ultimate voltage (majority evaluation). The priority order when the most evaluations are the same is A, E, B, D, C. An example of evaluation is shown in FIG.

  In the tap operation necessity determination process of step S104, the average voltage adjustment unit 4 receives the result of the substation voltage evaluation process of S101 and the result of the ultimate voltage evaluation process of S103, and performs voltage transformation according to the conditions of the condition table 50 shown in FIG. It is determined whether or not the tap operation of the device 21 is necessary (step S104).

  In the condition table 50 shown in FIG. 8, information for adjusting the voltage of the transformer 21 derived from the relationship between the voltage reached to the customer 25 and the substation voltage (voltage of the transformer 21) (command for raising the tap) “UP”, lowering command “DN”, maintenance “−”) are set.

  When the result of the tap operation determination is that the tap operation is necessary (Yes in Step S104), the average voltage adjustment unit 4 subsequently determines whether or not the tap operation of the transformer 21 is possible (Step S105).

  In the tap operation availability determination process in step S105, the average voltage adjustment unit 4 obtains the tap upper / lower limit information of the transformer 21 and the stored current transformer tap position from the system information DB 6, and determines whether the tap operation is necessary in step S104. As a result of the determination process, it is determined whether or not the tap upper and lower limits are deviated.

  In addition, the average voltage adjustment unit 4 stores the previous determination result of the transformer tap operation necessity in the memory, and the previous operation stored in the memory and the current determination result are in the opposite directions. In such a case, the tap operation is disabled.

  If the result of the tap operation availability determination process in step S105 is that the tap operation is possible, the average voltage adjustment unit 4 updates the changed transformer tap information by the transformer tap setting change process in S106, and the voltage calculation unit 3 Then, the voltage calculation is executed again, and the voltage at the substation end and the voltage at the customer end of each transmission system are recalculated.

  After the recalculation, the average voltage adjustment unit 4 re-executes the process from the substation voltage evaluation process in step S101, determines whether or not the operation is necessary by the tap operation necessity determination process in step S104, or determines whether or not the tap operation is possible in step S105. The process is repeated until it is determined that the operation is impossible by the determination process.

Finally, the power transmission system voltage adjustment in step S5 will be described.
The power transmission system voltage adjustment unit 5 determines the tap of the transformer 21 and the state of the SC / ShR 23 using the tap of the transformer 21 temporarily determined by the average voltage adjustment unit 4 and the voltage obtained from the voltage calculation unit 3. .

  The operation of the power transmission system voltage adjustment unit 5 will be described with reference to the flowchart of FIG. FIG. 9 is a flowchart showing the operation of the power transmission system voltage adjustment unit 5.

  In FIG. 9, a loop S <b> 201 indicates a loop that repeats the process by the number of power transmission systems connected to the substation 20.

  In the power transmission system voltage evaluation process in step S202, the power transmission system voltage adjustment unit 5 evaluates the customer voltage obtained from the voltage calculation unit 3 in five stages from A to E according to FIG. As shown, the most rank among the voltage evaluations of each consumer is determined as the evaluation of each power transmission system 26a to 26c.

  For example, when there is even one AorE, the power transmission system is evaluated as AorE.

  If there are evaluations of A and E, the one with the larger number is adopted. When A and E are the same number, priority is given to A evaluation.

  If there is no evaluation of A and E, and there is even one evaluation of BorD, the evaluation of the transmission system is BorD.

  If there are B and D evaluations, the one with the larger number is adopted. When B and D are the same number, priority is given to B evaluation. If there is no evaluation of A, B, D, E, the evaluation of the transmission system is C.

  If the evaluation of the transmission system is B, C, or D, the process is terminated and the evaluation of other transmission systems is performed.

  As a result of the evaluation, if the evaluation is A or E (Yes in step S202), the power transmission system voltage adjustment unit 5 performs an SC / ShR input determination process (step S203).

  In the SC / ShR input determination process in step S203, the power transmission system voltage adjustment unit 5 acquires the installation position information and capacity information of the SC / ShR 23 from the system information DB 6 and the current input status, and when the evaluation of the power transmission system is A. The SC / ShR 23 near the customer end with the lowest voltage is searched. If the evaluation is E, the SC / ShR 23 near the customer end with the highest voltage is searched.

  The transmission system voltage adjustment unit 5 determines whether or not the SC / ShR 23 can be turned on / off from the searched SC / ShR 23 based on the current turn-on state and capacity information. Next, it is determined whether or not the next SC / ShR 23 can be turned on / off (step S204).

  In the SC / ShR on / off determination process in step S204, the power transmission system voltage adjustment unit 5 determines that the power transmission system cannot be turned on when there is no SC / ShR 23 that can be turned on / off, and enters the final stage of the loop S7. Moving.

  In addition, the power transmission system voltage adjustment unit 5 stores the previous determination condition, and when the SC / ShR23 on / off determination is reversed from the previous one, the power transmission system voltage adjustment unit 5 moves to the final stage of the loop S201.

  When there is an SC / ShR 23 that can be turned on / off, the transmission system voltage adjustment unit 5 updates the SC / ShR making information after changing the SC / ShR setting by the SC / ShR setting changing process in step S205. Then, the voltage calculation unit 3 is caused to perform voltage calculation again, and the voltage at the customer end of the power transmission system is recalculated.

  When the loop S201 finishes evaluating all the power transmission systems, the power transmission system voltage adjustment unit 5 evaluates all the power transmission system voltages (step S206), and evaluates the ultimate voltage from the results of all the power transmission systems.

The ultimate voltage is evaluated as shown in FIG.
That is, when there is even one power transmission system with an evaluation of AorE, the evaluation is set to AorE.
When there are transmission systems with evaluations A and E, the one with the larger number is adopted. When A and E are the same number, priority is given to A evaluation.

If the evaluation results are B, C, D, the process is terminated.
On the other hand, when the evaluation result is A or E, in the tap operation necessity determination process of step S207, the necessity of the tap operation of the transformer 21 is determined according to the conditions of the condition table 50 in FIG.

  As shown in FIG. 8, in the condition table 50, tap operation information corresponding to the relationship between the ranks A to E of the voltage reached to the consumer 25 and the substation voltages (1) to (5) is set. . For example, “−” indicating that the tap operation is not necessary is set within the allowable range, and information (“UP” or “DN”) indicating in which direction the tap is variable (adjusted) is set outside the allowable range.

  “UP” indicates that the tap is raised by one step, and “DN” indicates that the tap is lowered by one step. By increasing the tap, the substation voltage is adjusted in a stepwise manner. Further, the substation voltage is adjusted in a stepwise manner by lowering the tap.

  In the tap operation availability determination process in step S207, the power transmission system voltage adjustment unit 5 acquires the tap upper / lower limit information of the transformer 21 and the current transformer tap position stored in the memory from the system information DB 6, and determines whether the tap operation is necessary. As a result of the processing S205, it is determined whether or not the tap voltage adjustment range (upper and lower limit threshold values) is deviated.

  The previous transformer tap operation necessity determination result is stored, and when the stored previous operation and the current determination result are operations in opposite directions, the tap operation is disabled.

  When the result of the tap operation availability determination process is that the tap operation is possible, the power transmission system voltage adjustment unit 5 performs the transformer tap / SC / ShR setting change process (step S208) and changes the transformer tap setting. After the transformer tap information is updated and the SC / ShR input status of all transmission systems is returned to the initial value (step S209), the voltage calculation unit 3 is made to perform voltage calculation again (step S3), and the substation Recalculate end voltage and consumer end voltage.

  After the recalculation, the power transmission system voltage adjustment unit 5 re-executes the process from the loop S201, and it is determined that the execution is completed by the all power transmission system voltage evaluation process S206 or the tap operation is determined to be impossible by the tap operation availability determination process S208. Repeat the process until

  As described above, the normal tap control amount of the transformer 21 and the normal control amount (injection / cutoff amount) of the SC / ShR 23 determined by the power transmission system voltage adjustment unit 5 are sent to the voltage / reactive power adjustment device control amount transmission unit 7. It is done.

  In the voltage / reactive power adjustment device control amount transmission unit 7, the tap control amount transmission unit 12 transmits the control amount to the transformer 21 to control the transformer 21, and the SC / ShR control amount transmission unit 13 transfers to the SC / ShR 23. A control amount is transmitted to control SC / ShR23.

  In the above description, the case where the power transmission system is three (three) power transmission systems 26a, 26b, and 26c has been described. However, the same concept can be applied even when there is one or many power transmission systems.

  Moreover, the voltage of the substation 20 is adjusted by switching the tap of the transformer 21, and an example of an electric power system having an SC / ShR 23 as a voltage / reactive power adjusting device in the power transmission system is shown. When there is SVC as a voltage adjustment or voltage / reactive power adjustment device in the power transmission system, the same effect can be obtained as a method for controlling the control target value of SVC.

  As described above, according to the first embodiment, the tap state of the transformer 21 of the substation 20 is measured, and the state of the SC / ShR 23 is measured from the plurality of power transmission systems 26a, 26b, 26c. The state of each system is evaluated from the measured values, and the control amount is determined so that the voltage of each system falls within the range of the average value, and the voltage / reactive power adjusting device (SC / ShR23, transformer 21) of each system By controlling the above, it is possible to manage the voltage of the entire power system from the substation 20 to the customer 25.

(Second Embodiment)
A second embodiment will be described with reference to FIG.
This 2nd Embodiment adds the consumer electric power measurement part 14 to the electric power grid voltage control system of 1st Embodiment.

  The consumer power measurement unit 14 measures the load amount of each customer 25 in the power transmission systems 26 a, 26 b, 26 c and the power generation amount of the distributed power source 27, and receives them by the system state estimation unit 2 via the measurement information processing unit 11. hand over.

  In this example, the system state estimation unit 2 estimates (predictive calculation) the load amount of each customer 25 and the power generation amount of the distributed power source in the power transmission systems 26a, 26b, and 26c. The estimation accuracy (prediction accuracy) can be improved by using the measured values of the load amount of the customer 25 and the power generation amount of the distributed power source 27.

  Thus, the voltage / reactive power adjusting device such as the SC / ShR 23 and the transformer 21 can be controlled so that the voltage of the entire power system in which the plurality of power transmission systems 26a, 26b, and 26c have different voltage distributions is within the management range. .

(Third embodiment)
A third embodiment will be described with reference to FIGS.
In the third embodiment, in the configuration of the power system voltage control system of the first embodiment, the average voltage adjustment unit 4 and the transmission system voltage adjustment unit 5 shown in FIG. The system voltage adjustment unit 5a is used. In the first embodiment, the two-stage determination is performed. In the third embodiment, the worst value of the voltage of the power transmission system is determined and evaluated in one stage.

The operation of the power transmission system voltage adjustment unit 5a according to the third embodiment will be described with reference to FIG.
In this case, the voltage calculation unit 3 calculates the terminal of the substation from the current configuration of the transmission systems 26a, 26b, and 26c obtained by the system state estimation unit 2, the load amount of the customer 25, and the power generation amount of the distributed power source 27. And the voltage at the customer end are calculated (step S3 in FIG. 14).

  The power transmission system voltage adjustment unit 5a evaluates the substation voltage by evaluating the voltage at the substation end calculated by the voltage calculation unit 3 in five stages according to the condition table 50 shown in FIG. 5 (step S301). In this case, the worst value is evaluated.

  The condition table 50 in FIG. 15 is different from the condition table 50 shown in FIG. 8 in the ranks D and E having the highest voltage reached to the consumer end (referred to as the customer voltage) and the rank having the lowest substation voltage ( In the case of 1), it is “determination 1”, and in the case of ranks (4) and (5) where the voltage reached to the consumer end is the lowest and the substation voltage is low, “determination 2”.

  In this way, when “determination 1” or “determination 2” is evaluated, it is determined that the power transmission systems 26a, 26b, and 26c are subject to voltage adjustment, and the SC / ShR 23 is turned on / off.

  The power transmission system voltage adjustment unit 5a evaluates the plurality of customer voltages calculated by the voltage calculation unit 3 in five stages of ranks A to E according to FIG. 5B, so that each of the power transmission systems 26a, 26b, and 26c The customer voltage is evaluated by rank (step S302).

  After the evaluation, the power transmission system voltage adjustment unit 5a counts the rank (evaluation) of the customer voltage for each of the power transmission systems 26a, 26b, and 26c, and the demand for each power transmission system 26a, 26b, and 26c by the following method. The evaluation of the house voltage is determined as one rank (evaluation).

If there is even one AorE, the power transmission system is evaluated as AorE.
When A and E exist, the one with the larger number is adopted. When A and E are the same number, priority is given to A evaluation.

  When there is no A and E, and there is even one BorD, the transmission system is evaluated as BorD. If B and D exist, use the one with the largest number. When B and D are the same number, priority is given to B evaluation. If there is no A, B, D, E, the evaluation of the transmission system is C.

  This evaluation condition is the same as the power transmission system voltage evaluation (step S202 in FIG. 9) described in the first embodiment. That is, the number of five-level evaluations of ranks A to E for each power transmission system is counted, and the evaluation of the ultimate voltage is determined as one rank by the following method (step S303).

If there is even one AorE, the evaluation is AorE.
When A and E exist, the one with the larger number is adopted. When A and E are the same number, priority is given to A evaluation.

If there is no A and E, and there is even one BorD, the evaluation is BorD. If B and D exist, use the one with the largest number. When B and D are the same number, priority is given to B evaluation.
If there is no A, B, D, E, the evaluation is C.

  The power transmission system voltage adjustment unit 5a determines whether or not the tap operation of the transformer 21 is necessary according to the conditions of the condition table 50 shown in FIG. 15 from the results of the substation voltage evaluation and the reached voltage evaluation (step S304). If it is determined that no operation is required (No in step S304), the process is terminated. In the conditions of the condition table 50 shown in FIG. 15, special conditions (conditions when the voltage shows the worst value) such as “determination 1” and “determination 2” are set.

“Decision 1” is a determination condition that a tap operation is required when rank (1) of the substation voltage is the lowest and rank D or E is higher than the reference rank C.
“Decision 2” is a determination condition that a tap operation is required when the substation voltage is rank (4) or (5) higher than the reference rank (3) and rank A has the lowest ultimate voltage.

  On the other hand, when it determines with tap operation | movement being required (Yes of step S304), the power transmission system voltage adjustment part 5a repeats loop process S305 for the number of power transmission systems.

  The power transmission system voltage adjustment unit 5a determines whether or not the power transmission system voltage is to be adjusted based on the result of the tap operation necessity determination process S304 and the power transmission system evaluation result (step S306).

  In this case, when the result of the tap operation necessity determination processing S304 is “determination 1” and the evaluation of the target power transmission system is D or E, or the result of the tap operation necessity determination processing S304 is “determination 2” and the target When the transmission system evaluation is A, the transmission system voltage adjustment unit 5a determines that the transmission systems 26a, 26b, and 26c are also subject to voltage adjustment (Yes in step S306), and otherwise (step S306). No), the power transmission systems 26a, 26b, and 26c are not subjected to voltage adjustment, and the processing in the loop processing S305 is not performed.

  When it determines with the voltage adjustment object of the power transmission system 26a, 26b, 26c (Yes of step S306), the power transmission system voltage adjustment part 5a displays the installation position information and capacity information of SC / ShR23 from the system information DB 6 and the current input status. It is acquired and it is determined whether or not the SC / ShR 23 is inserted (step S307).

  Here, when the result of the tap operation necessity determination in step S304 is determination 1, the power transmission system voltage adjustment unit 5a searches for the SC / ShR 23 in the vicinity of the customer end with the highest voltage, and the necessity of the tap operation in step S304. When the determination result is “determination 2”, the SC / ShR 23 near the customer end having the lowest voltage is searched.

  The power transmission system voltage adjustment unit 5a determines whether or not the SC / ShR 23 can be turned on / off based on the current turning-on state and capacity information for the retrieved SC / ShR 23 (step S308). (No in step S308), it is determined whether or not the SC / ShR 23 closest to the customer end can be turned on / off.

  In the SC / ShR insertion availability determination process in steps S307 and S308, if there is no SC / ShR 23 that can be turned on / off in the target power transmission system, it is determined that the entry is impossible and the process moves to the final stage of loop S25.

  When there is an SC / ShR 23 that can be turned on / off, the power transmission system voltage adjustment unit 5a performs SC / ShR setting change processing (step S309), and then changes the SC / ShR setting, and then SC / ShR insertion information. Update.

  After the evaluation of all the power transmission systems is completed by repeating the loop processing S305, the power transmission system voltage adjustment unit 5a performs a determination process as to whether or not a tap operation is necessary (step S310).

  In this tap operation availability determination process, the upper and lower limits of the tap voltage of the transformer 21 and the currently held tap position of the transformer 21 are acquired from the system information DB 6, and the result of the operation of the tap operation necessity determination process S304 is acquired. Then, it is determined whether or not the upper and lower limits of the tap stage are deviated, and when the upper and lower limits of the tap stage are deviated, it is determined that the tap operation is impossible.

  As a special condition, if the result of the tap operation necessity determination process in step S304 is determination 1 and the determination result in the SC / ShR insertion enable / disable determination process in step S308 is not impossible to input, the tap is raised, and an unapplicable transmission system is selected. If there is, lower the tap.

  If the determination result of the tap operation necessity determination process at step S304 is determination 2 and the determination result of the SC / ShR insertion enable / disable determination process at step S308 is not input, the tap is lowered and there is a transmission system that cannot be input. Determines that the upper and lower limits of the tap level are not deviated from the assumption that the tap is raised.

  In addition, the power transmission system voltage adjustment unit 5a stores the number of executions of the process in the memory, and when the number of executions exceeds the upper limit of the number of executions of the process, determines that the tap operation is impossible and ends the process.

  As a result of the tap operation availability determination process in step S310, if the tap operation is possible (Yes in step S310), the transmission system voltage adjustment unit 5a updates the tap information of the transformer 21 after changing the transformer tap setting. The first voltage calculation of the process is executed (step S3), and the voltage at the substation end and the voltage at the customer end are recalculated.

  After the recalculation, the power transmission system voltage adjustment unit 5a re-executes the process from the substation voltage determination process in step S301, and determines that the result of the tap operation necessity determination process in step S304 is unnecessary, or the tap operation in step S310. The process is repeated until it is determined that the operation is impossible as a result of the determination process.

  In the description of the third embodiment, the case where there are three power transmission systems as in the first embodiment has been described, but it is needless to say that the same idea can be applied even when there are one, two, or four or more power transmission systems. Yes. In addition, the substation voltage is adjusted by the tap of the transformer 21 and an example of the power system having the SC / ShR 23 as the voltage / reactive power adjusting device is shown in the transmission system. When there is SVC or the like as the voltage / reactive power adjustment device, the same effect can be obtained as a method for controlling the control target value of SVC.

  As described above, according to the third embodiment, the voltage / reactive power adjustment of the SC / ShR 23, the transformer 21 and the like is performed so that the voltage of the entire power system in which the plurality of power transmission systems exhibit different voltage distributions is within the management range. The device can be controlled.

(Fourth embodiment)
A fourth embodiment will be described with reference to FIG.
The electric power system voltage control system of 4th Embodiment changed the electric power and voltage measurement part 8 of FIG. 1 into the voltage measurement part 8a among 1st Embodiment and 3rd Embodiment, and added the consumer electric power measurement part 14 Is.

  The voltage measurement unit 8 a measures the voltage of the transformer 21 and passes the measurement value to the voltage calculation unit 3 via the measurement information processing unit 11. The consumer power measurement unit 14 measures the load amount of the plurality of consumers 25 and the power generation amount of the distributed power source 27 of the power transmission systems 26a, 26b, and 26c, and the measured load amount and distributed power source of the plurality of consumers 25. The power generation amount 27 is transferred to the voltage calculation unit 3 through the measurement information processing unit 11. For this reason, although the system state estimation part 2 shown in FIG. 1 becomes unnecessary, the system state estimation part 2 may be provided depending on the case, and it may be switched and used.

  As described above, according to the fourth embodiment, by providing the consumer power measuring unit 14 in the voltage control apparatus 101, the load amount of the consumer 25 and the power generation amount of the distributed power source 27 are measured with high accuracy. The voltage / reactive power adjusting devices such as the SC / ShR 23 and the transformer 21 are controlled so that the voltage of the entire power system in which the plurality of power transmission systems 26a, 26b, and 26c have different voltage distributions is within the management range. be able to.

(Fifth embodiment)
The fifth embodiment will be described with reference to FIG.
The electric power system voltage control system of 5th Embodiment changes the state measurement part 1 of FIG. 1 into measurement information DB17 among 1st Embodiment and 3rd Embodiment.

  In the fifth embodiment, the power system information is not measured, but the tap information of the transformer 21, the status information of the SC / ShR 23, the voltage of the substation 20 and the power at the substation end of the power transmission system are stored in the measurement information DB 17 in advance. The measurement information is stored and various information is read from the measurement information DB 17 and used.

  Information in the measurement information DB 17 is stored from a control device or measurement device higher than the voltage control device 101. Note that the information in the measurement information DB 17 may not be actually measured data, but may be information estimated or predicted by the system state estimation unit 2 or the like.

  In the fifth embodiment, the state measurement unit 1 shown in FIG. 1 is omitted. However, the state measurement unit 1 may be provided and used by switching to the measurement information DB 17.

  As described above, according to the fifth embodiment, the SC / ShR 23, the transformer 21, and the like such that the plurality of power transmission systems 26 a, 26 b, 26 c have the voltage of the entire power system showing different voltage distributions within the management range. The voltage / reactive power adjustment device can be controlled.

(Sixth embodiment)
The sixth embodiment will be described with reference to FIG.
The electric power system voltage control system of 6th Embodiment changes the state measurement part 1 and the system state estimation part 2 of FIG. 1 among 1st Embodiment and 3rd Embodiment to system state DB15.

  The power system voltage control system according to the sixth embodiment does not include the state measuring unit 1 that measures information on the power system, and the power system voltage, tap information of the transformer 21, and the SC / ShR 23 state are previously stored in the system state DB 15. Information, system load information of each customer 25 of the power transmission systems 26a, 26b, 26c and system state information of the power generation amount of each distributed power source 27 are stored in advance, and various information is read from the system state DB 15 and used. To do.

  Information in the system state DB 15 is stored from a control device higher than the voltage control device 101. The information in the system state DB 15 may be information estimated or predicted by the system state estimation unit 2 or the like instead of the measured system state data.

  In the sixth embodiment, the state measurement unit 1 and the system state estimation unit 2 in FIG. 1 are omitted. However, the state measurement unit 1 and the system state estimation unit 2 are provided and used by switching to the system state DB 15. May be.

  As described above, according to the sixth embodiment, the SC / ShR 23, the transformer 21 and the like such that the plurality of power transmission systems 26a, 26b, and 26c have the voltage of the entire power system showing different voltage distributions within the management range. The voltage / reactive power adjustment device can be controlled.

(Seventh embodiment)
The seventh embodiment will be described with reference to FIG.
The power system voltage control system of the seventh embodiment is obtained by changing the voltage / reactive power adjustment device control amount transmission unit 7 of FIG. 1 to the control information DB 16 in the first embodiment or the third embodiment.

  In the case of the seventh embodiment, the tap of the transformer 21 and the SC / ShR control amount determined by the power transmission system voltage adjustment unit 5 are stored in the control information DB 16.

  In the seventh embodiment, since the voltage / reactive power adjusting device is not directly controlled, it can be used by being incorporated in a simulation device or a prediction device.

  Further, the control amount stored in the control information DB 16 can be used as a control amount target value for the lower control device, and can be configured in combination with the lower control device.

  In the seventh embodiment, the voltage / reactive power adjustment device control amount transmission unit 7 shown in FIG. 1 is omitted, but the control information DB 16 and the voltage / reactive power adjustment device control amount transmission unit 7 are not omitted. They may be used in parallel.

(Eighth embodiment)
The eighth embodiment will be described with reference to FIG.
The power system voltage control system of the eighth embodiment is obtained by changing the voltage / reactive power adjustment device control amount transmission unit 7 of FIG. 17 to the control information DB 16 in the configuration described in the fifth embodiment.

  In the eighth embodiment, similarly to the fifth embodiment, the control amount (raising or lowering) of the tap of the transformer 21 and the control amount (turning on or shutting off) of the SC / ShR determined by the power transmission system voltage adjustment unit 5 are calculated. It is assumed that it is stored in the control information DB 16.

  In the case of the eighth embodiment, the voltage control device 101 itself does not have a measurement unit, and does not directly control the voltage / reactive power adjustment device, so that it can be used by being incorporated in a simulation device or a prediction device.

  In the eighth embodiment, the voltage / reactive power adjustment device control amount transmission unit 7 shown in FIG. 17 is omitted, but the control information DB 16 is not omitted without omitting the voltage / reactive power adjustment device control amount transmission unit 7. And may be used in parallel.

(Ninth embodiment)
The ninth embodiment will be described with reference to FIG.
The power system voltage control system of the ninth embodiment is obtained by changing the voltage / reactive power adjustment device control amount transmission unit 7 of FIG. 18 to the control information DB 16 in the sixth embodiment.

  In the ninth embodiment, similarly to the eighth embodiment, the control amount (up or down) of the tap of the transformer 21 and the control amount (turn on or off) of the SC / ShR determined by the power transmission system voltage adjustment unit 5 are calculated. It is assumed that it is stored in the control information DB 16.

  In the ninth embodiment, the voltage control device 101 itself does not have a measurement unit, and does not directly control the voltage / reactive power adjustment device, so that it can be used by being incorporated in a simulation device or a prediction device.

  In the ninth embodiment, the voltage / reactive power adjustment device control amount transmission unit 7 shown in FIG. 18 is omitted. However, the control information DB 16 and the voltage / reactive power adjustment device control amount transmission unit 7 are not omitted. They may be used in parallel.

  Although the embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  Further, each component shown in the above embodiment may be realized by a program installed in a storage such as a hard disk device of a computer, and the program is stored in a computer-readable electronic medium: electronic media, The computer may realize the functions of the present invention by causing a computer to read a program from an electronic medium. Examples of the electronic medium include a recording medium such as a CD-ROM, flash memory, and removable media. Further, the configuration may be realized by distributing and storing components in different computers connected via a network, and communicating between computers in which the components are functioning.

  DESCRIPTION OF SYMBOLS 1 ... State measurement part, 2 ... System state estimation part, 3 ... Voltage calculation part, 4 ... Average voltage adjustment part, 5 ... Transmission system voltage adjustment part, 6 ... System information database (system information DB), 7 ... Voltage / invalidity Power adjustment device control amount transmission unit, 8 ... power / voltage measurement unit, 8a ... voltage measurement unit, 9 ... tap measurement unit, 10 ... SC / ShR state measurement unit, 11 ... measurement information processing unit, 12 ... tap control amount transmission , 13 ... SC / ShR control amount transmission unit, 14 ... consumer power measurement unit, 15 ... system state database (system state DB), 20 ... substation, 21 ... transformer, 22a-22c ... circuit breaker, 23 ... SC / ShR, 24a, 24b, 24c ... power transmission line, 25 ... consumer, 26a-26c ... power transmission system, 27 ... distributed power source, 27 ... distributed power source, 50 ... condition table, 101 ... voltage control device.

Claims (5)

In a voltage control device that controls the voltage of a power system including a power supply system that supplies power to a consumer, and a power transmission system that connects the power supply system and the consumer via a power transmission line,
A measuring unit for measuring the voltage and power of the feeding system;
A system information storage unit storing system information including the configuration of the devices connected to the power supply system and the power transmission system;
An estimation calculation unit that estimates and calculates a load amount and a power generation amount of a customer in the power transmission system using information on the power feeding system measured by the measurement unit and system information stored in the system information storage unit;
A control amount for controlling the voltage of the estimate calculating part load before Ki需 main house calculated by the power generation amount and the transmission grid, the voltage calculation unit that calculates a voltage to the voltage of the customer of the power supply system When,
Using voltage and the customer of the voltage calculated by the voltage calculating portion and the power supply system, the voltage of the transmission system is provisionally determines the control amount that falls within the allowable range, at provisionally determined control amount A temporary control amount determination unit that causes the voltage calculation unit to recalculate the voltage of the power supply system and / or the consumer ;
Whether the voltage of the power feeding system and the voltage of the customer recalculated by the temporary control amount determining unit are appropriate is evaluated based on a preset evaluation condition, and based on the evaluation result, the power feeding system and / or Or an evaluation unit that determines a control amount of a voltage to the transmission system;
A voltage control apparatus comprising: a transmission unit that transmits the control amount determined by the evaluation unit as a regular control amount to a voltage / reactive power adjustment device of a transmission system to be adjusted. The voltage control apparatus according to claim 1, wherein the temporary control amount determination unit temporarily determines a control amount so that an average voltage of each power transmission system when a plurality of power transmission systems exist is within an allowable range. A condition table in which adjustment information of the voltage of the power transmission system derived from the relationship between the voltage reached to the customer side and the voltage of the power supply system is set;
The evaluation unit is
The voltage control apparatus according to claim 2, wherein a control amount of a voltage / reactive power adjustment device that adjusts the voltage of the power transmission system is determined according to the condition table. When there are a plurality of transmission systems, the evaluation unit evaluates the voltage value on the customer side existing in each transmission system in stages, counts the evaluated values for each transmission system, and the number of evaluations is the highest. The voltage control apparatus according to claim 1, wherein a number of stages are evaluated for the voltage of the power transmission system.   The voltage control device according to claim 4, wherein the evaluation unit sets a transmission system whose voltage evaluation is outside a predetermined level as a control amount adjustment target.

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