JP2023074612A - Power system stabilization system, computer program for power system stabilization system and power system stabilization method - Google Patents

Abstract

To provide a power system stabilization system, a method and a program by which shortage or excess of a power control amount to a necessary control amount is reduced and which calculates an appropriate power control amount.SOLUTION: In a power system stabilization system 1, a central processing unit 10 comprises: a load flow calculation transient stability calculation unit 104 which performs simulation for analyzing stability of a power system for a case where a power supply used as a control object is blocked in a power system 9; a control table setting unit 105 which creates a control table D13 showing a control amount as a total value of combination of power supplies to be blocked for stably operating and maintaining the power system for every accident appearance and generation output of the power supplies; and a setting information derivation unit 202 which derives a correlation equation for calculating a power control amount to a load flow value on the basis of an online calculation actual value calculated by the load flow calculation transient stability calculation unit. The setting information derivation unit calculates the power control amount by the stepwise correlation equation corresponding to a range of the load flow value on the basis of a plurality of online calculation actual values created up to the present time.SELECTED DRAWING: Figure 1

Description

This embodiment controls a plurality of power devices that transmit and receive electric power, and in the event of an accident such as a lightning strike in the power system, controls such as power supply restriction are performed to maintain stable operation of the power system. A stabilization system, a computer program for a power system stabilization system, and a power system stabilization method.

A power system consists of power plants, substations, and power lines that connect them to loads. A power system is a power equipment network that sends generated power to a load, and includes power generation equipment and transmission and transformation equipment from a power plant to the end of the load. The electric power applied to the electric power system is generated by power sources such as thermal power, nuclear power, and hydraulic power. Power generated by a plurality of power sources is supplied to loads via power transmission and transformation equipment. Stable operation and power quality of the power system are maintained by appropriately controlling multiple generators and transmission/transformation equipment. Even if an accident occurs in the power system due to a lightning strike or the like, it is preferable that control such as power supply restriction is appropriately performed to maintain stable operation of the power system. A power system stabilization system that controls power equipment provided in the power system is known.

JP 2018-085834 A Japanese Patent Application Laid-Open No. 2020-145880 JP 2011-061911 A

In recent years, many renewable energy power sources that generate power using renewable energy have been introduced. The output of renewable energy power sources may fluctuate sharply in a short period of time depending on weather conditions. There is a time difference between the time when the power situation in the power system is measured and the time when the power equipment is controlled after an accident actually occurs in the power system after the system model is created and the control target is selected. If, for example, the output of a renewable energy power supply fluctuates sharply during this time difference, the power flow at the time the power situation in the power system is measured will be different from the power flow at the time the power equipment is actually controlled. . For this reason, the power limit for the control target selected using the system information at the time when the power situation in the power system is measured is insufficient or excessive for the control amount required at the time when the power equipment is actually controlled. In some cases, there is a problem that it is impossible to perform stabilization control of the electric power system with high accuracy. If the amount of control is insufficient, there is a risk that stable operation of the power system cannot be maintained.

It is conceivable to shorten the time difference between the time when the power situation in the power system is measured and the time when the power equipment is actually controlled, but in order to realize it, the speed of system information acquisition and central processing must be increased. It is necessary to improve the processing capacity of the apparatus, and this entails a significant increase in cost. Therefore, it is preferable to correct the controlled variable by adding or reselecting the power equipment to be controlled so as not to run out of the controlled variable.

The present embodiment is a power system stabilization system that can calculate an appropriate shedding amount in which shortage is reduced and excess is reduced with respect to the required control amount. It is an object of the present invention to provide a computer program for a stabilization system and a power system stabilization method.

The power system stabilization system of this embodiment has the following features.
(1) In the power system, it has a power flow calculation transient stability calculation unit that performs an analytical simulation of the stability of the power system when the power supply to be controlled is cut off.
(2) Based on the results of the analysis simulation performed by the power flow calculation transient stability calculation unit, a control table showing the combination of the power sources to be cut off for each accident mode and the control amount that is the total value of the power generation output of the power sources is created. It has a control table setting part to create.
(3) Calculate the correlation between the power flow value and the shedding quantity based on the power source to be cut off for each accident mode calculated by the power flow calculation transient stability calculation unit, the control amount, and the online calculation actual value including the power flow value. It has a settling information deriving unit for deriving a correlation expression that represents the
(4) The setting information deriving unit derives a stepwise correlation formula for calculating the shedding quantity corresponding to the power flow value range based on the plurality of online calculation result values created so far.

A diagram showing the configuration of the power system stabilization system according to the first embodiment. A diagram for explaining a control table of the power system stabilization system according to the first embodiment. A diagram for explaining correction control setting information in the prior art related to the power system stabilization system according to the first embodiment. A diagram for explaining a control table after correction of the power system stabilization system according to the first embodiment. A diagram showing an example of correction control setting information in the prior art related to the power system stabilization system according to the first embodiment A diagram showing an example of correction control setting information of the power system stabilization system according to the first embodiment. A diagram for explaining derivation of correction control setting information of the power system stabilization system according to the first embodiment. A diagram for explaining correction control setting information of the power system stabilization system according to the first embodiment. FIG. 2 is a diagram showing the program flow of the central processing unit according to the first embodiment; FIG. 2 is a diagram showing the program flow of the central control unit according to the first embodiment; A diagram showing an example of correction control setting information of the power system stabilization system according to the first modification of the first embodiment. A diagram showing an example of correction control setting information of the power system stabilization system according to the second modification of the first embodiment A diagram showing the configuration of a power system stabilization system according to a second embodiment

[1. First Embodiment]
[1-1. overall structure]
A power system stabilization system 1 will be described as an example of the present embodiment with reference to FIG. As an example, the power system stabilization system 1 includes a central processing unit 10 , an accident detection terminal device 20 , a control terminal device 30 and a central control device 40 . The power system stabilization system 1 is connected to the power system 9 and the power supply information network 8 . The central processing unit 10 may be referred to as the "central processing unit (pre-processing unit)", and the central control unit 40 may be referred to as the "central processing unit (post-processing unit)". . Note that the central processing unit 10 and the central control unit 40 may be configured as one device by integrating their respective functions (for example, Patent Document 3). In this embodiment, the accident detection terminal device 20 and the control terminal device 30 may be collectively called terminal devices. The control amount for power supply limitation calculated using the correction control setting information D12 calculated by the setting information derivation unit 202, which will be described later, is referred to as "the shedding amount". In addition, the power source to be cut off in order to stabilize the power system 9 is a “power source to be controlled”, “power source to be controlled”, “power source to be controlled”, or simply “current control target”, It may be called a "controlled object".

(Power system 9)
The power system 9 is a power supply network that supplies power generated by the power source to loads. The power system 9 is composed of a plurality of power devices that transmit and receive power. The power equipment includes, for example, a power source, a circuit breaker, a disconnecting switch, a busbar, a transmission line, a transformer, and a phase modifying facility (not shown in the figure).

A power source is a power generation facility that generates and outputs electric power. The power source is a generator that generates electric power by hydraulic power, thermal power, nuclear power, or the like. The power source may be a renewable energy power source that generates electric power using renewable energy such as wind power and solar power. A plurality of power sources are arranged in the power system 9 .

A circuit breaker is a device that interrupts the flow of electric power generated by a power supply and transmitted through transmission lines, transformers, and busbars. When power supply is limited by the power system stabilization system 1, the power is cut off from the power system 9 by controlling the circuit breaker. The circuit breakers are controlled by a central controller 40 via a control terminal 30 . The circuit breaker is controlled, and power supply limitation (hereinafter referred to as shedding control) is performed in the power system 9 .

“Electrical control” refers to cutting off the power supply from the power system 9 . "Electric control" may be called "shutdown" or "parallel off". The term "control quantity" refers to the output power of the power supply to be controlled. The "electrical control amount" may be referred to as a "control amount".

(Power supply information network 8)
The power supply information network 8 is normally composed of a dedicated communication line using microwave radio, optical fiber, or the like. Communication is performed between a measuring device (not shown in the drawing) arranged in the power system 9 and the central processing unit 10 via the power supply information network 8 . The measuring device measures the states of power equipment such as power supplies, circuit breakers, disconnecting switches, busbars, transmission lines, and transformers. Measuring devices are installed at substations and power plants. System information D<b>81 measured by the measuring device is transmitted to the central processing unit 10 via the power supply information network 8 . The power supply information network 8 may be one that performs wired communication, or one that performs wireless communication.

(Accident detection terminal device 20)
The accident detection terminal device 20 is a terminal device in which a contact information input circuit, a voltage/current input circuit, an active power measurement circuit, a transmission/reception circuit, and the like are composed of digital relays. The accident detection terminal device 20 transmits system information D<b>21 and accident information D<b>22 in the power system 9 to the central control device 40 . A plurality of accident detection terminal devices 20 are arranged at a substation or the like that can detect a hypothetical accident.

The grid information D<b>21 is information about the connection state of the power grid 9 and the power supply and demand state detected by the accident detection terminal device 20 . The system information D21 includes, for example, on/off information of power devices in the power system 9 and measurement information regarding the supply and demand state of power. The on/off information is information indicating whether a circuit breaker, a disconnector, or the like is on or off. The measurement information includes information on power supply output, load, transmission line, transformer, active power flowing through the bus (hereinafter referred to as power flow value), and bus voltage of each electric station. The accident detection terminal device 20 takes in ON/OFF information of a circuit breaker, a disconnecting switch, etc. through a contact information input circuit. Also, the active power measuring circuit measures the output of the power source, the load, and the active power of the transmission line using the voltage and current information taken in by the voltage and current input circuit, and creates system information D21.

The accident information D<b>22 is information about an accident that has occurred in a power device in the power system 9 . For example, when an accident occurs in a transmission line, it is information indicating the power equipment involved in the accident and the accident mode. The accident detection terminal device 20 captures, for example, an operation signal of an accident elimination relay (protective device installed in the electric power system, not shown in the figure) and on/off information of a circuit breaker through a contact information input circuit, and creates accident information D22. .

(Control terminal device 30)
The control terminal device 30 is a terminal device in which a contact information input circuit, a contact information output circuit, a voltage/current input circuit, an active power measurement circuit, a transmission/reception circuit, and the like are configured by digital relays. Based on the control command D44 received from the central controller 40, the control terminal device 30 controls the circuit breaker by the contact information output circuit to cut off the specified power supply from the power system 9. The control terminal device 30 outputs system information D31. A plurality of control terminal devices 30 are arranged in a power plant or the like having a power supply to be regulated.

The grid information D<b>31 is information about the connection state of the power grid 9 and the power supply and demand state detected by the control terminal device 30 . The system information D31 includes, for example, on/off information of power devices in the power system 9 and measurement information regarding the supply and demand state of power. The on/off information is information indicating whether a circuit breaker, a disconnector, or the like is on or off. The measurement information includes information on power supply output, load, power flow value, and bus voltage at each power station. The control terminal device 30 takes in ON/OFF information of circuit breakers, disconnecting switches, etc. through a contact information input circuit. Also, the active power measurement circuit measures the output of the power source, the load, and the active power of the transmission line using the voltage and current information taken in by the voltage and current input circuit, and creates system information D31.

(Central processing unit 10)
The central processing unit 10 is a device that receives the system information D81, creates a control table D13 and correction control setting information D12 by calculation, and outputs them. The central processing unit 10 is configured by a computer or the like. The central processing unit 10 is connected to the power supply information network 8 and the central control unit 40 . The central processing unit 10 is installed in a central power dispatching center of a general power transmission and distribution operator.

The control table D13 is a table showing the power supplies to be stopped when an accident occurs and the control amount, which is the total value of the outputs of the power supplies. The control table D13 records the power supplies to be shedding and control amounts for all assumed accident modes.

The correction control settling information D12 is information indicating the relationship between the power flow value to be monitored and the control amount required to maintain stable operation of the power system when an accident occurs. The correction control settling information D12 is created for all assumed accident modes.

The central processing unit 10 includes a system information acquisition unit 101, a system model creation unit 102, a selection target list creation unit 103, a power flow calculation transient stability calculation unit 104, a control table setting unit 105, an online calculation result information recording unit 201, and setting information. It has a derivation unit 202 and a settling information recording unit 203 . System information acquisition unit 101, system model creation unit 102, selection target list creation unit 103, power flow calculation transient stability calculation unit 104, control table setting unit 105, online calculation result information recording unit 201, setting information derivation unit 202, setting information The recording unit 203 is configured by an arithmetic unit in a computer or a software module.

Some or all of these components are hardware such as LSI (Large Scale Integrated circuit), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), GPU (Graphics Processing Unit) (circuit part ; including circuitry), or by cooperation of software and hardware.

The central processing unit 10 also has a storage unit 204 , a storage unit 205 and a storage unit 206 . Storage unit 204, storage unit 205, and storage unit 206 are configured by a storage medium such as a semiconductor memory or a hard disk. The storage unit 204 stores online calculation result information D11. The storage unit 205 stores correction control settling information D12. Storage unit 206 stores control table D13.

Some or all of these components are, for example, HDD (Hard Disk Drive), flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), ROM (Read Only Memory), or RAM (Random Access Memory). may be configured.

In the following description, the processes executed by each of the system information acquisition unit 101, the system model creation unit 102, the selection target list creation unit 103, the power flow calculation transient stability calculation unit 104, and the control table setting unit 105 are described as online precomputation. , or online computation.

The system information acquisition unit 101 is connected to the power supply information network 8 . The system information acquisition unit 101 receives system information D81 from the power supply information network 8 at a predetermined cycle. The grid information D81 is information about the connection state of the power grid 9 and the power supply and demand state. The system information D81 includes, for example, on/off information of power devices in the power system 9 and measurement information regarding the supply and demand state of power. The on/off information is information indicating whether a circuit breaker, a disconnector, or the like is on or off. The measurement information includes information on power supply output, load, power flow value, and bus voltage at each power station. The system information acquisition unit 101 transmits the received system information D81 to the system model creation unit 102 .

The system model creation unit 102 creates a system model based on the system information D81 received by the system information acquisition unit 101 . The grid model is data that models the power grid 9 . The system model creation unit 102 transmits the created system model to the selection target list creation unit 103 .

The selection target list creation unit 103 creates a selection target list based on the system information D81. A selection list is a list of power sources that can be controlled. The selection target list creation unit 103 determines whether control is possible from the operating state of the power supply in which the control terminal device is installed, creates a selection target list, and transmits the selection target list to the power flow calculation transient stability calculation unit 104 . The operating state of the power supply includes the ON/OFF state of the circuit breaker, the output level of the power supply, and the like.

The power flow calculation transient stability calculation unit 104 performs analysis simulation based on the system model created by the system model creation unit 102 and the selection target list created by the selection target list creation unit 103 . The power flow calculation transient stability calculation unit 104 performs an analysis simulation on the stability in the event of an accident in the power system, and if the result is unstable, the power supply to be stopped is sequentially added, and the control content that stabilizes the result. (Combination of electric power sources to be electrically controlled) is determined. The analysis simulation is performed by transient stability calculation for the behavior of the electric power system 9 when the power supply to be controlled is cut off. The power flow transient stability calculation unit 104 transmits the calculated analysis simulation result to the control table setting unit 105 and the online calculation result information recording unit 201 .

The control table setting unit 105 records the analysis simulation result calculated by the power flow transient stability calculation unit 104 in the control table D13. The control table D13 is a table showing the power supplies to be stopped when an accident occurs and the control amount, which is the total value of the outputs of the power supplies. The control table D<b>13 records power sources to be de-regulated and control amounts for all assumed accident modes. The control table setting unit 105 creates a control table D13 indicating combinations of power sources to be cut off and control amounts for maintaining the stability of the power system when an accident occurs, based on the analysis simulation performed by the power flow calculation transient stability calculation unit 104. create. The control table setting unit 105 causes the storage unit 206 to store the control table D13.

Storage unit 206 is configured as a database. The storage unit 206 accumulates and stores the control table D13 created by the control table setting unit 105. FIG. The control table D13 stored in the storage unit 206 is transmitted to the central control device 40. FIG.

Online calculation result information recording unit 201 creates online calculation result information D11 based on the analysis simulation result calculated by power flow calculation transient stability calculation unit 104 and control table D13 created by control table setting unit 105 . The online calculation result information D11 is information indicating each result of the analysis simulation periodically obtained by the online pre-calculation.

The online computation performance information D11 includes each analysis simulation result as an online computation performance value. The online calculation result information D11 is, for example, information in which a monitored power flow value is associated with information regarding the content of control. The online calculation result information recording unit 201 transmits the online calculation result information D11 to the setting information deriving unit 202 and stores it in the storage unit 204 .

Storage unit 204 is configured as a database. The storage unit 204 accumulates and stores the online computation performance information D11 created by the online computation performance information recording unit 201 . The online calculation result information D11 stored in the storage unit 204 is transmitted to the settling information deriving unit 202. FIG.

The setting information derivation unit 202 derives the correction control setting information D12 based on the online calculation result information D11 created by the online calculation result information recording unit 201 and accumulated and stored in the storage unit 204 . The correction control settling information D12 is information indicating the relationship between the power flow value to be monitored and the shedding amount required to maintain stable operation of the power system when an accident occurs. The correction control settling information D12 is created for all assumed accident modes. The settling information derivation unit 202 calculates the shedding amount from the power flow value based on the online calculation actual value including the power flow value to be monitored in the system model used for the control amount calculated by the power flow calculation transient stability calculation unit 104 and the analysis simulation. Correction control setting information D12 for calculating is derived. The settling information derivation unit 202 derives a stepwise correlation equation between the power flow value and the control amount for calculating the control amount corresponding to the range of the power flow value based on a plurality of online calculation result values created so far. The setting information derivation unit 202 transmits the correction control setting information D12 to the setting information recording unit 203. FIG.

The setting information recording unit 203 causes the storage unit 205 to store the correction control setting information D12 derived by the setting information deriving unit 202 .

Storage unit 205 is configured as a database. The storage unit 205 stores the correction control setting information D12 derived by the setting information deriving unit 202. FIG. Correction control settling information D12 stored in storage unit 205 is transmitted to central control unit 40 .

(Central controller 40)
The central control unit 40 is a device that selects a power supply based on the system information D21, the accident information D22, and the system information D31, and creates and outputs a control command D44 based on the correction control setting information D12 and the control table D13. The central control device 40 transmits to the control terminal device 30 a control command D44 for shutting off the power supply to be controlled.

Further, the central control unit 40 creates a control table D42 for backup control when an abnormality occurs in the central processing unit 10. FIG. The central controller 40 creates a post-correction control table D43 corresponding to the change in power flow. The central control device 40 creates a control command D44 based on the backup control control table D42 or the post-correction control table D43 and transmits it to the control terminal device 30 .

The central control unit 40 is composed of a digital relay or the like having a transmitting/receiving circuit and the like. The central controller 40 is connected to the accident detection terminal device 20 , the control terminal device 30 and the central processing unit 10 . The central control unit 40 is installed at a substation of a general power transmission and distribution company.

The central control unit 40 includes a system information acquisition unit 301, a selection target list creation unit 302, a backup control selection unit 303, an abnormality detection unit 304, a control table switching unit 305, a power flow change detection unit 401, a correction control target determination unit 402, an accident It has an information receiving section 500 and a control command output section 600 .

Some or all of these components are hardware such as LSI (Large Scale Integrated circuit), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), GPU (Graphics Processing Unit) (circuit part ; including circuitry), or by cooperation of software and hardware.

The central control device 40 also has a storage section 306 , a storage section 307 , a storage section 403 , a storage section 404 and a storage section 405 . Storage unit 306, storage unit 307, storage unit 403, storage unit 404, and storage unit 405 are configured by a storage medium such as a semiconductor memory. The storage unit 306 stores the backup control correlation equation D41. The storage unit 307 stores a backup control control table D42. The storage unit 403 stores correction control settling information D12. The storage unit 404 stores the control table D13. The storage unit 405 stores the post-correction control table D43.

Some or all of these components are, for example, HDD (Hard Disk Drive), flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), ROM (Read Only Memory), or RAM (Random Access Memory). may be configured.

System information acquisition unit 301 is connected to accident detection terminal device 20 and control terminal device 30 . The system information acquisition unit 301 receives the system information D21 from the accident detection terminal device 20 and the system information D31 from the control terminal device 30 at predetermined intervals. The system information D21 and the system information D31 are information regarding the connection state of the power system 9 and the supply and demand state of electric power. The system information D21 and the system information D31 include, for example, on/off information of power equipment in the power system 9 and measurement information regarding the supply and demand state of power. The system information acquisition unit 301 transmits the received system information D21 and system information D31 to the selection target list creation unit 302 and the power flow change detection unit 401 .

The selection target list creation unit 302 receives the system information D21 and the system information D31 from the system information acquisition unit 301 . The system information D21 and the system information D31 include information on power sources to be controlled in the power system 9. FIG. The selection target list creation unit 302 creates a selection target list, which is a list of controllable power supplies, based on the system information D21 and the system information D31. The selection target list creation unit 302 transmits the selection target list to the backup control selection unit 303 .

The storage unit 306 stores the backup control correlation equation D41. The backup control correlation formula D41 is a correlation formula for performing backup control when an abnormality occurs in the central processing unit 10 . The backup control correlation formula D41 is a correlation formula showing the relationship between the power flow value and the required control amount. The backup control correlation equation D41 is set and stored in the storage unit 306 in advance by the operator of the power system stabilization system 1 .

The backup control selection unit 303 creates a backup control control table D42 based on the selection target list received from the selection target list creation unit 302, the system information D21, and the backup control correlation equation D41 stored in the storage unit 306. The backup control control table D42 is a list showing the power supplies to be controlled in the backup control performed by the central processing unit 40 when an abnormality occurs in the central processing unit 10 for each assumed accident mode. The backup control selection unit 303 causes the storage unit 307 to store the backup control control table D42.

The storage unit 307 stores the backup control control table D42 created by the backup control selection unit 303 .

The power flow change detection unit 401 receives the system information D21 and the system information D31 from the system information acquisition unit 301 . The power flow change detection unit 401 detects power flow changes based on the system information D21 and the system information D31. The power flow change detection unit 401 detects, as a power flow change, a change in the power flow at the time immediately before power shedding due to an actual occurrence of a system fault with respect to the time when the power situation in the power system 9 was measured. The power flow change detection unit 401 transmits the detected power flow change to the correction control target determination unit 402 .

The storage unit 403 receives and stores the correction control setting information D12 from the storage unit 205 of the central processing unit 10 .

The storage unit 404 receives and stores the control table D13 from the storage unit 206 of the central processing unit 10 .

The correction control target determination unit 402 determines a post-correction control table based on the power flow change detected by the power flow change detection unit 401, the correction control settling information D12 stored in the storage unit 403, and the control table D13 stored in the storage unit 404. Create D43. The post-correction control table D43 is a table showing the power sources to be shemmed when an accident occurs and the control amount, which is the total output value of the power sources, corresponding to power flow changes. The correction control target determination unit 402 causes the storage unit 405 to store the post-correction control table D43.

The storage unit 405 receives and stores the post-correction control table D43 from the correction control target determination unit 402 .

The abnormality detection unit 304 detects abnormality of the central processing unit 10 . The anomaly detection unit 304 monitors online arithmetic processing by the central processing unit 10 and detects an anomaly related to transmission or arithmetic that occurs during the course of the online arithmetic processing. The abnormality detection section 304 transmits the detected abnormality to the control table switching section 305 . An abnormality in the central processing unit 10 is detected by, for example, being unable to receive the control table D13 from the central processing unit 10 .

The control table switching unit 305 selects one of the corrected control table D43 stored in the storage unit 405 and the backup control control table D42 stored in the storage unit 307 and transmits it to the control command output unit 600 . When the abnormality detection unit 304 detects an abnormality, the backup control control table D42 is selected, and when the abnormality detection unit 304 does not detect an abnormality, the corrected control table D43 is selected.

The accident information receiving section 500 receives the accident information D22 from the accident detection terminal device 20 and transmits it to the control command output section 600 . The accident information D22 includes the location of the accident and the mode of the accident.

Control command output unit 600 receives accident information D22 from accident information receiving unit 500 and outputs control command D44. Based on the accident information D22 received from the accident information receiving unit 500, the control command output unit 600 determines the accident mode in the controlled object, and converts the corrected control table D43 or the backup control control table D42 selected by the control table switching unit 305. A control target is selected based on and a control command D44 is created. The control command output unit 600 transmits the control command D44 to the control terminal device 30. FIG.

The above is the configuration of the power system stabilization system 1 according to the present embodiment.

[1-2. action]
Next, based on FIGS. 1 to 10, the outline of the operation of the power system stabilization system 1 of this embodiment will be described. FIG. 9 is a diagram showing a program flow when the central processing unit 10 is configured by software modules. The program shown in FIG. 9 is built in the central processing unit 10. FIG. FIG. 10 is a diagram showing a program flow when the central controller 40 is configured by software modules. The program shown in FIG. 10 is built in the central controller 40. FIG. The power system stabilization system 1 performs the following operations and calculations.

(Operation of central processing unit 10)
The central processing unit 10 receives the system information D81, derives the control table D13 and the correction control setting information D12 by calculation, and outputs them. The central processing unit 10 receives system information D81 from the power supply information network 8 at a predetermined cycle, reflects the latest state of the power system 9, and updates the control table D13 and the correction control setting information D12.

A control table D13 is created based on the latest state of the power system 9 related to the system information D81. The control table D13 is a table showing the power supplies to be stopped when an accident occurs and the control amount, which is the sum of the output values of the power supplies.

The central processing unit 10 creates online computation result information D11 related to the analysis simulation results. The online computation performance information D11 includes each analysis simulation result as an online computation performance value. Correction control setting information D12 is created based on the online calculation result information D11. The correction control settling information D12 is information indicating the relationship between the power flow value to be monitored and the required shedding amount. The details of the operation of the central processing unit 10 are as follows.

The central processing unit 10 receives the system information D81 from the power supply information network 8 at predetermined intervals by the system information acquisition unit 101 . The grid information D81 is information about the connection state of the power grid 9 and the power supply and demand state. A measuring device arranged in the power system 9 measures the state of power equipment such as a power supply, a circuit breaker, a disconnecting switch, a transmission line, a transformer, and a bus, and outputs the information to the central processing unit 10 via the power supply information network 8 as system information D81. sent to.

The system information D81 includes, for example, on/off information of power devices in the power system 9 and measurement information regarding the supply and demand state of power. The on/off information is information indicating whether a circuit breaker, a disconnector, or the like is on or off. The measurement information includes information on power supply output, load, power flow value, and bus voltage at each power station. The system information acquisition unit 101 transmits the received system information D81 to the system model creation unit 102 . When the central processing unit 10 is composed of software modules, the above process is executed in step S101.

The central processing unit 10 creates a system model using the system model creation unit 102 based on the system information D81 received by the system information acquisition unit 101 . The system model is data modeling the power system 9, and is composed of various models representing nodes, branches, generators, generator control devices, and the like.

A node is data of a bus, a generator, and a load, and has a node number as identification information. The node information includes information such as active power and reactive power of the power supply and load, bus voltage, etc., corresponding to the node number. A branch is a data representation of a transmission line and a transformer, and has a branch number as identification information. The branch information includes information such as the node number of the connection destination (starting node and terminal node), the number of operating lines, impedance, etc., corresponding to the branch number. Various models representing generators and generator control devices are set in the generator node. For the load node, the magnitude of power demand (active power and reactive power), its voltage characteristics, frequency characteristics, etc. are set.

The system model creation unit 102 performs state estimation calculation based on the system information D81 received before the accident and data on system equipment, and creates a system model representing the system state at that time. Data related to the system equipment are set and stored in the central processing unit 10 in advance. The system model creation unit 102 transmits the created system model to the selection target list creation unit 103 . When the central processing unit 10 is composed of software modules, the above processing is executed in step S102.

The central processing unit 10 uses the selection target list creation unit 103 to create a selection target list based on the system information D81. A selection list is a list of power sources that can be controlled. The selection target list is created based on the information about the power sources to be controlled included in the system information D81.

The information about the power supply to be controlled is information indicating the active power output value of the target power supply and whether the power supply can be controlled. For example, a power supply that satisfies a predetermined condition, such as a currently operating power output that exceeds a predetermined value and is not excluded from shutdown targets by the system operator, is a power supply that can be controlled. The selection target list creation unit 103 transmits the selection target list, which is a list of controllable power sources, to the power flow calculation transient stability calculation unit 104 . When the central processing unit 10 is composed of software modules, the above processing is executed in step S103.

The central processing unit 10 uses the power flow calculation transient stability calculation unit 104 to perform an analysis simulation based on the system model created by the system model creation unit 102 and the selection target list created by the selection target list creation unit 103. conduct. The analytical simulation is for confirming the stability of the electric power system 9 when the power source to be controlled is cut off, and is performed by power flow calculation and transient stability calculation. The power flow calculation transient stability calculation unit 104 first performs power flow calculation based on the system model created by the system model creation unit 102 .

By the power flow calculation, the power flow value (active power P and reactive power Q) flowing through the transmission line and the transformer and the magnitude V and the phase δ of the bus voltage are calculated. The power flow calculation transient stability calculation unit 104 performs a transient stability calculation simulation of the behavior of the electric power system 9 when the power supply to be controlled is cut off after the occurrence of an accident, based on the calculation result of the power flow calculation.

A simulation is performed for a plurality of presumed accidents set in advance. The power flow calculation transient stability calculation unit 104 changes the selection of power sources to be controlled, and repeats transient stability calculations until a stable system is obtained, thereby calculating individual power sources and combinations of power sources. The power flow transient stability calculation unit 104 transmits the analysis simulation result to the control table setting unit 105 and the online calculation result information recording unit 201 . If the central processing unit 10 is composed of software modules, the above process is executed by step S104.

The central processing unit 10 uses the control table setting unit 105 to record the analysis simulation result calculated by the power flow transient stability calculation unit 104 in the control table D13. FIG. 2 shows an example of the control table D13. The control table D13 is a table showing the power supplies to be stopped when an accident occurs and the control amount, which is the sum of the output values of the power supplies. The control table D13 records the contents of all possible accident aspects.

The control table D13 is periodically subjected to online pre-computation and updated periodically in preparation for the occurrence of an assumed accident. Online precomputation is performed, for example, every 30 seconds, and the control table D13 is updated. The control table D13 shows combinations of power sources to be controlled and control amounts for each assumed accident mode. The control table setting unit 105 transmits the control table D13 to the online calculation result information recording unit 201 and stores it in the storage unit 206 . If the central processing unit 10 is composed of software modules, the above process is executed in step S105.

The storage unit 206 stores the control table D13 recorded by the control table setting unit 105. FIG.

The central processing unit 10 uses the online calculation result information recording unit 201 to perform online calculation based on the analysis simulation result calculated by the power flow calculation transient stability calculation unit 104 and the control table D13 recorded by the control table setting unit 105. Create performance information D11. The online calculation result information D11 is information indicating each result of the analysis simulation periodically obtained by the online pre-calculation. The online computation performance information D11 includes each analysis simulation result as an online computation performance value. The online calculation result information D11 is, for example, information in which a monitored power flow value is associated with information regarding the content of control.

The power flow value to be monitored is system information that has a strong correlation with the severity of the assumed accident, and is, for example, the power flow value (active power) before the accident occurred in the target transmission line of the assumed accident. The power flow value to be monitored is calculated by power flow calculation using system information by the power flow calculation transient stability calculation unit 104 .

The information about the content of control is the content of control for stabilizing an unstable phenomenon that occurs when a hypothetical accident occurs. For example, the information about the contents of control is information about the name of the power supply selected as the control target, and the amount of power (control amount) that is electrically cut off from the power system 9 when the power supply to be controlled is cut off. be.

In this embodiment, as an example, the information about the content of control is the amount of electric power that is electrically cut off from the power system 9 when the power supply to be controlled is cut off.

The online calculation result information recording unit 201 extracts the monitored power flow value from the analysis simulation result calculated by the power flow calculation transient stability calculation unit 104, and based on the control table D13 recorded by the control table setting unit 105. Extract the selection result of the controlled object. The online calculation result information recording unit 201 creates the online calculation result information D11 every time it extracts the monitored power flow value and the selection result of the controlled object corresponding to this monitored power flow value. The online computation performance information recording unit 201 transmits the online computation performance information D11 to the settling information deriving unit 202 and accumulates and stores it in the storage unit 204 . When the central processing unit 10 is composed of software modules, the above process is executed in step S201.

The storage unit 204 accumulates and stores the online computation performance information D11 created by the online computation performance information recording unit 201 .

The central processing unit 10 uses the setting information derivation unit 202 to derive the correction control setting information D12 based on the online calculation result information D11 created by the online calculation result information recording unit 201 and stored in the storage unit 204 . The correction control settling information D12 is information indicating the relationship between the power flow value to be monitored and the required shedding amount. The required shedding amount is the total value of the output applied to the power supplies to be shemmed. The correction control settling information D12 is created for all assumed accident modes.

In the prior art, the relationship between the monitored power flow value for each assumed accident mode and the required control amount in the correction control setting information D12 is generally represented by a linear expression. For example, in the prior art, the relationship between the monitored power flow value and the required control amount is represented by a correlation formula based on a linear formula such as y=a·x+b. x is the monitored power flow value and y is the required control amount. a and b are coefficients. FIG. 3 shows the relationship between the monitored power flow value and the required control amount for each assumed accident mode in the conventional technology.

Calculation of the shedding amount in the prior art will be described with reference to FIG. In FIG. 5, L0 is an approximate straight line representing the relationship between the monitored power flow value and the required control amount. The approximate straight line L0 is calculated by the method of least squares or the like based on the online calculation result information D11 stored in the storage unit 204. FIG. A plurality of white circles in FIG. 5 are online calculation result values, and indicate individual pieces of the online calculation result information D11. The approximation straight line L0 represents an approximation of the relationship between the monitored power flow value and the required control amount.

In the prior art, a straight line obtained by translating the approximate straight line L0 is used as the correction control settling information L1. The straight line related to the correction control setting information L1 is designed to have a large control amount that is the most severe value for the monitored power flow value that is bundled with respect to the required control amount while maintaining the slope of the approximate straight line L0. created in The created straight line is used as the correction control settling information L1. The correction control setting information L1 is used to calculate the shedding amount based on the power flow value to be monitored.

When the shedding amount is calculated based on the correction control setting information L1 shown in FIG. 5, the control amount becomes excessive with respect to the power flow value to be monitored. As shown in the distribution of the white circles, which are the online calculation actual values, the relationship between the actual monitored power flow value and the shedding amount is distributed stepwise. When the control amount is calculated using the straight line for the correction control setting information L1, the power supply to be controlled is selected so that the control amount exceeds the power control amount. Therefore, the control amount, which is the total output of the power sources to be controlled, becomes larger than the control amount of the online calculation result information D11. In FIG. 5, black circles indicate the control amount, which is the total output of the power sources to be controlled, and white circles indicate the control amount of individual online calculation result information D11.

The shedding amount is calculated based on a straight line corresponding to the correction control setting information L1. However, a difference M0 occurs between the shedding amount and the minimum control amount. Moreover, a difference M1 occurs between the required control amount and the shedding amount. This is because the power supplies to be shemmed are selected so as to exceed the required amount of control.

In the example of FIG. 5, when calculating the shedding amount based on the straight line related to the correction control setting information L1, the ideal control amount corresponding to the monitored power flow value P2 is C1. However, since the outputs of the power sources that can be selected as shedding targets are large and have discrete values, there is no combination of power sources that has the control amount C1. Therefore, the combination of power supplies whose control amount is the closest to C1 is selected from among the combinations of power supplies whose control amount is greater than or equal to C1.

In the example of FIG. 5, C2 is selected as the control amount corresponding to the combination of power supplies whose control amount is closest to C1. In the vicinity of the monitored power flow value P2, C2 is selected as the controlled variable. As a result, the shedding amount becomes excessive with respect to the required control amount.

In addition, a control target may be selected for a monitored power flow value determined to be stabilized without shutting down the power supply. In FIG. 5, the area of 0≦x≦P1 is an area determined to have no control target based on the online calculation result information D11. However, when a power supply to be shed is selected based on the straight line related to the correction control setting information L1, the required control amount becomes a positive value in the region of 0≦x≦P1, and the required control A controlled object corresponding to the quantity is selected. Of the required control amounts corresponding to the monitored power flow values, the shedding amounts corresponding to regions M0 and M1 hatched in FIG. 5 are unnecessary excessive control.

As described above, in the power system stabilization system 1 of the prior art, a correlation expression related to the correction control setting information L1 is created so as not to cause insufficient control even at the time of a sudden change in power flow, and the correlation expression related to the correction control setting information L1 is used. Correction control information was created by the user, and correction control was performed. Since the correlation formula related to the correction control settling information L1 is a linear formula, the control amount becomes excessive when the shedding amount having a margin is calculated so as to prevent insufficient control. In addition, when the number of data samples used to obtain the correlation formula is small, a correlation formula with low accuracy is created, and there is a concern that the precision of the shedding amount may be lowered. The data sample used when obtaining the correlation formula is the actual value of correction control information calculated by online calculation.

In order to solve the above problem, the setting information derivation unit 202 according to the present embodiment replaces the correlation equation related to the correction control setting information L1 with the shedding amount set stepwise corresponding to the power flow value to be monitored. The control amount is calculated based on the correlation expression related to the correction control settling information D12.

The setting information derivation unit 202 according to this embodiment derives the correction control setting information D12 based on the online calculation result information D11 created by the online calculation result information recording unit 201 and stored in the storage unit 204 . The correction control settling information D12 is information that expresses the relationship between the power flow value to be monitored and the shedding amount by a stepwise correlation formula.

The settling information deriving unit 202 creates a step-like function based on the maximum control amount in the range of power flow values among the plurality of online computation performance values related to the online computation performance information D11 created so far, and performs shedding control. Calculate the amount and create a stepwise correlation equation.

An example of the correction control setting information D12 derived by the setting information deriving section 202 is shown in FIG. Derivation of the correction control settling information D12 by the settling information derivation unit 202 will be described with reference to FIG. FIG. 7 shows the derivation process of the correction control settling information D12. The vertical axis in FIG. 7 indicates the control amount, and the horizontal axis indicates the power flow value to be monitored.

Based on the online calculation result information D11 created by the online calculation result information recording unit 201, individual online calculation result values are plotted as shown in FIG. White circles shown in FIG. 7 are individual online calculation result values. A shedding amount equal to or greater than the individual online calculation actual value is derived step by step as the correction control setting information D12. In FIG. 7, N0 is the amount of shedding applied to the correction control settling information D12.

In FIG. 7, L1 indicates correction control settling information according to the prior art. The correction control settling information L1 according to the prior art is represented by a correlation equation based on a linear equation such as y=a·x+b. x is the monitored power flow value and y is the required control amount. a and b are coefficients.

The setting information derivation unit 202 according to the present embodiment substitutes for the correction control setting information L1, and derives a correlation equation having a shedding amount set in stages corresponding to the power flow value to be monitored as the correction control setting information D12. . As shown in FIG. 8, the correction control settling information D12 indicates the correlation between the monitored power flow value P for each assumed accident mode and the total output (controlled amount) of the generator output to be shed, and the monitored power flow value P and Fig. 3 shows the correlation of required control variables; The correlation between the monitored power flow value P and the required control amount is, for example, a stepped correlation such as y=0 (0<x≦P1), y=C0 (P1<x≦P2), . . . is represented by the formula

The settling information deriving unit 202 derives the power flow value to be monitored and the current value according to the point (hereinafter referred to as the rise point) at which the required control amount in the online calculation result information D11 exceeds a predetermined threshold value and changes stepwise. Correction control settling information D12 indicating the relationship with the limit is derived.

In addition, the settling information deriving unit 202, for example, when the online calculation result information D11 is small due to the reason that the data of the monitored power flow value and the required control amount are not sufficiently accumulated, Correction control setting information D12 indicating the relationship between the power flow value to be monitored and the shedding amount is set in advance based on the required control amount.

The settling information deriving unit 202 corrects the interval from the rising point in the online calculation result information D11 to the next rising point to be a constant shedding amount corresponding to the selection result of the controlled object indicated in the online calculation result information D11. The control settling information D12 is derived. As a result, compared to the shedding amount based on the correction control setting information L1 in the prior art, an appropriate shedding amount is selected in which an excessive control amount such as the control amount corresponding to the regions M0 and M1 in FIG. 5 is reduced. be done.

The setting information derivation unit 202 transmits the derived correction control setting information D12 to the setting information recording unit 203. FIG. If the central processing unit 10 is composed of software modules, the above process is executed in step S202.

The central processing unit 10 causes the storage unit 205 to store the correction control setting information D12 derived by the setting information derivation unit 202 by the setting information recording unit 203 . If the central processing unit 10 is composed of software modules, the above process is executed in step S203.

The storage unit 205 stores the correction control setting information D12 derived by the setting information deriving unit 202. FIG.

(Operation of central controller 40)
The central controller 40 selects a power supply based on the system information D21, the accident information D22, and the system information D31, and creates and outputs a control command D44 based on the correction control setting information D12 and the control table D13. The central control device 40 transmits to the control terminal device 30 a control command D44 for shutting off the power supply to be controlled.

The central control unit 40 also creates a backup control control table D42 that is used for backup control when an abnormality occurs in the central processing unit 10 . The central controller 40 creates a post-correction control table D43 corresponding to the change in power flow. The central control device 40 creates a control command D44 based on the backup control control table D42 or the post-correction control table D43 and transmits it to the control terminal device 30 .

The central control unit 40 periodically receives the system information D21 from the accident detection terminal device 20 and the system information D31 from the control terminal device 30, detects the latest state of the power system 9, and detects the state of the power system 9 when the power flow suddenly changes. Correction is performed so as not to be electric control, and the selection result of the controlled object is updated.

When an assumed accident actually occurs, the central processing unit 40 sends a control command D44 to the control terminal device 30 to cut off the power supply to be cut based on the control table D13 created in advance by the central processing unit 10. Send.

In addition, as a backup control function, the central control unit 40, when an abnormality occurs in the central processing unit 10, based on the backup control control table D42 created in advance, provides a control command to cut off the power supply to be power-supplied. D44 is created and transmitted to the control terminal device 30. When an abnormality occurs in the central processing unit 10, the central control unit 40 replaces the control table D42 for backup control, creates a control command D44 based on the control table D42 for backup control, and transmits it to the control terminal device 30.

Central control unit 40 receives system information D21 from accident detection terminal device 20 and system information D31 from control terminal device 30 at predetermined intervals by system information acquisition unit 301 . The system information D21 and the system information D31 are information regarding the connection state of the power system 9 and the supply and demand state of electric power.

The accident detection terminal device 20 arranged in the power system 9 measures the state of the power equipment at the electric station where the accident detection terminal device 20 is installed, and transmits it to the central control device 40 as the system information D21. The control terminal device 30 arranged in the power system 9 measures the state of the power equipment at the electric station where the control terminal device 30 is installed, and transmits the measured data to the central control device 40 as system information D31. Information related to the system information D21 and information related to the system information D31 may overlap.

The system information D21 and the system information D31 are information regarding the connection state of the power system 9 and the supply and demand state of electric power. The system information D21 and the system information D31 include, for example, on/off information of power equipment in the power system 9 and measurement information regarding the supply and demand state of power.

The on/off information is information indicating whether a circuit breaker, a disconnector, or the like is on or off. The measurement information includes information on power supply output, load, power flow value, and bus voltage at each power station. The system information acquisition unit 301 transmits the received system information D21 and system information D31 to the selection target list creation unit 302 and the power flow change detection unit 401 . When the central controller 40 is configured by software modules, the above process is executed by step S301.

The central control unit 40 receives the system information D21 and the system information D31 from the system information acquisition unit 301 by the selection target list creation unit 302 . The system information D21 and the system information D31 include information on power sources to be controlled in the power system 9. FIG. The selection target list creation unit 302 creates a selection target list, which is a list of controllable power supplies, based on the system information D21 and the system information D31. A power supply that can be controlled is, for example, a power supply that satisfies a predetermined condition, such as being currently in operation, having an output exceeding a predetermined value, and not being excluded from shutdown targets by the system operator. The selection target list creation unit 302 transmits the selection target list to the backup control selection unit 303 . If the central controller 40 is composed of software modules, the above process is executed by step S302.

The storage unit 306 stores the backup control correlation equation D41. The backup control correlation formula D41 is a correlation formula for performing backup control when an abnormality occurs in the central processing unit 10 . The backup control correlation formula D41 is a correlation formula showing the relationship between the power flow value and the required control amount. The backup control correlation equation D41 is set and stored in the storage unit 306 in advance by the operator.

The backup control correlation equation D41 is, for example, a correlation equation expressing the relationship between the power flow value and the required control amount by a linear equation such as y=a·x+b for each assumed accident mode. x is the power flow value of the fault point transmission line, and y is the required control amount y. a and b are coefficients. The storage unit 306 stores the coefficient a and the intercept b as set values.

The central control unit 40 uses the backup control selection unit 303 to create a backup control control table D42 based on the selection target list received from the selection target list creation unit 302 and the backup control correlation equation D41 stored in the storage unit 306. . The backup control control table D42 is a list showing power supplies to be controlled for each assumed accident mode used in backup control performed when an abnormality occurs in the central processing unit 10 .

The backup control selection unit 303 calculates the required control amount based on the backup control correlation expression D41, and based on the selection target list created by the selection target list creation unit 302, the control amount exceeding the required control amount is calculated. A control object is selected so as to have a control amount, and a control table D42 for backup control is created. The backup control selection unit 303 causes the storage unit 307 to store the backup control control table D42. When the central controller 40 is configured by software modules, the above process is executed by step S303.

The storage unit 307 stores the backup control control table D42 created by the backup control selection unit 303 .

Central control unit 40 receives system information D21 and system information D31 from system information acquisition unit 301 by means of power flow change detection unit 401 . The power flow change detection unit 401 detects power flow changes based on the system information D21 and the system information D31. A power flow change is a change between the power flow at the time when online pre-computation is performed at which the power situation in the power system 9 is measured and the power flow immediately before the time when the power equipment is actually controlled.

For example, the power flow change detection unit 401 compares the current power flow cross section with the power flow cross section used when creating the system model used in the online pre-calculation, and detects the power flow change when the power flow increases from the time of the online pre-calculation. To detect. The detection of power flow change is repeatedly performed at a constant period such as one second. The power flow change detection unit 401 transmits the detected power flow change to the correction control target determination unit 402 . When the central controller 40 is configured by software modules, the above process is executed by step S401.

The storage unit 403 receives and stores the correction control settling information D12 from the storage unit 205 of the central processing unit 10 .

The storage unit 404 receives and stores the control table D13 from the storage unit 206 of the central processing unit 10 .

The central control unit 40 uses the correction control target determination unit 402 to determine the power flow change detected by the power flow change detection unit 401, the correction control setting information D12 stored in the storage unit 403, and the control table D13 stored in the storage unit 404. Based on this, a post-correction control table D43 is created. The post-correction control table D43 is a table showing the power sources to be shemmed when an accident occurs and the control amount, which is the total output of the power sources, corresponding to changes in power flow. The correction control target determination unit 402 causes the storage unit 405 to store the post-correction control table D43.

The correction control target determination unit 402 receives the power flow change detected by the power flow change detection unit 401, and corrects the control target when the control amount required for correction control is greater than the control amount recorded in the control table D13. . Specifically, the correction control target determination unit 402 refers to the correction control setting information D12 stored in the storage unit 403, and determines the power generator to be de-regulated so that the shedding amount is greater than the required control amount. is added, and the control table D13 is corrected to create a corrected control table D43.

FIG. 4 shows an example of the post-correction control table D43. The post-correction control table D43 is a table showing the power supplies to be shut down when an accident occurs and the control amount, which is the total output of the power supplies. The post-correction control table D43 is created for all assumed accident modes.

When the power flow change detection unit 401 does not detect an increase in power flow, the correction control target determination unit 402 stores the control table D13 created by the central processing unit 10 as a corrected control table D43 in the storage unit 405 without correcting it. . If the central controller 40 is composed of software modules, the above process is executed by step S402.

The storage unit 405 receives and stores the post-correction control table D43 from the correction control target determination unit 402 .

The central control unit 40 detects an abnormality of the central processing unit 10 by using the abnormality detection unit 304 . The anomaly detection unit 304 monitors online arithmetic processing by the central processing unit 10 and detects an anomaly related to transmission or arithmetic that occurs during the course of the online arithmetic processing.

The anomaly detection unit 304 detects, for example, an anomaly related to the reception of the system information D81 by the system information acquisition unit 101 and an anomaly in online pre-calculation processing by the power flow calculation transient stability calculation unit 104 . The abnormality detection section 304 transmits the detected abnormality to the control table switching section 305 . If the central controller 40 is composed of software modules, the above process is executed by step S304.

The central control unit 40 selects one of the post-correction control table D43 stored in the storage unit 405 and the backup control control table D42 stored in the storage unit 307 by the control table switching unit 305, and the control command output unit 600. When the abnormality detection unit 304 detects an abnormality, the backup control control table D42 is selected, and when the abnormality detection unit 304 does not detect an abnormality, the corrected control table D43 is selected. If the central controller 40 is composed of software modules, the above process is executed by step S305.

The central control unit 40 receives the accident information D22 from the accident detection terminal device 20 through the accident information receiving unit 500 and transmits the received accident information D22 to the control command output unit 600 . The accident information D22 includes the location of the accident and the mode of the accident. If the central controller 40 is composed of software modules, the above process is executed by step S500.

Central control unit 40 receives accident information D22 from accident information receiving section 500 through control command output section 600, and outputs control command D44. The control command output unit 600 determines the mode of the accident based on the accident information D22 received from the accident information receiving unit 500, and converts the corrected control table D43 or the backup control control table D42 selected by the control table switching unit 305 into Based on this, a control target is selected and a control command D44 is created.

The control command output unit 600 creates a control command D44 for shutting off the selected power source to be controlled. The control command output unit 600 transmits the control command D44 to the control terminal device 30. FIG. If the central controller 40 is composed of software modules, the above process is executed by step S600.

Based on the received control command D44, the control terminal device 30 performs control to cut off the power to be controlled.

The above is the operation of the power system stabilization system 1 according to the present embodiment.

[1-3. effect]
(1) According to the present embodiment, the central processing unit 10 includes the power flow calculation transient stability calculation unit 104 that performs analytical simulation of the control amount when the power supply to be controlled in the power system 9 is cut off, and the power flow calculation Based on the analysis simulation performed by the transient stability calculation unit 104, a control table setting unit 105 that creates a control table D13 showing a combination of power sources to be cut off for each accident mode and a control amount that is the total value of the power generation output of the power sources. and a settling information derivation unit 202 that calculates the shedding amount for the power flow value based on the online calculation performance value including the power supply to be cut off, the control amount, and the power flow value calculated by the power flow calculation transient stability calculation unit 104. Then, the settling information derivation unit 202 derives a stepwise correlation formula corresponding to the range of power flow values based on a plurality of actual values of online calculations created so far, to obtain the required control amount. , it is possible to provide a central processing unit 10 that can calculate an appropriate shedding amount that is less likely to be insufficient and less likely to be excessive.

According to this embodiment, even when the state of the electric power system 9 changes and the required control amount changes suddenly, an appropriate shedding amount is calculated based on the correction control setting information D12 based on the stepped correlation equation. can do. This makes it possible to calculate a shedding amount that suppresses excessive control compared to the shedding amount calculated by a linear function in the prior art. Further, even when the number of data in the online calculation result information D11 used to obtain the correlation formula is small, the shedding amount can be calculated based on the preset stepwise correlation formula.

(2) According to the present embodiment, the settling information deriving unit 202 creates a stepwise correlation equation based on the maximum control amount in the range of power flow values among the plurality of online calculation actual values created so far. Then, since the shedding amount is calculated, the central processing unit 10 can calculate an appropriate shedding amount with reduced shortage and excess with respect to the required control amount. can be provided.

The settling information deriving unit 202 calculates a constant shedding amount corresponding to the selection result of the controlled object indicated in the online calculation result information D11 from the rising point in the online calculation result information D11 to the next rising point. Then, correction control setting information D12 is created. Since the calculated shedding amount is the maximum shedding amount in the range of power flow values, an appropriate shedding amount with reduced shortage is calculated.

[1-4. Modification]
(1) First Modification In the above-described embodiment, the setting information deriving unit 202 performs the maximum control in the range of the power flow value among the plurality of online calculation result values related to the online calculation result information D11 created so far. A stepwise function representing the correlation between the power flow value and the shedding quantity is derived based on the amount, and the derived stepwise correlation formula is created as the correction control setting information D12. However, derivation of the stepwise correlation equation by the settling information derivation unit 202 is not limited to the above.

The setting information derivation unit 202 determines the online calculation result values belonging to the same time zone as the current time within the range of power flow values among the plurality of online calculation result values related to the online calculation result information D11 created so far. A stepwise correlation equation may be created based on the control amount to calculate the shedding amount, and the correction control settling information D12 may be created using the stepwise correlation equation.

The operation of the settling information derivation unit 202 according to the first modified example will be described with reference to FIG. The online calculation result values related to the online calculation result information D11 are created by classifying them for each time period, and are accumulated and stored in the storage unit 205. FIG. Each of the plurality of online calculation result values includes time zone data.

A case will be described where 24 hours in a day are divided into 8 time zones of 3 hours each. It is assumed that each time zone is divided as shown in FIG. 11(b). For example, when the current time is 16:00, the settling information deriving unit 202 creates a stepwise correlation formula based on the control amount related to the online calculation result value for the time period 6 including 16:00. Correction control setting information D12 is created.

When there are a plurality of online calculation result values for the same time period, the correction control setting information D12 is based on the control amount for the online calculation result value created at the latest date and time among the online calculation result values for the same time period. may be created.

Alternatively, if there are a plurality of online calculation result values for the same time period, the correction control setting information D12 is based on the maximum control amount or the average value of the control amount among the plurality of online calculation result values for the same time period. may be created.

If there is no online calculation result value belonging to the same time zone as the current time, the correction control settling information D12 may be created based on the control amount related to the online calculation result value for a time zone close to the current time.

The time period may be defined for each day of the week, national holidays, or season.

The setting information derivation unit 202 determines the online calculation result values belonging to the same time zone as the current time within the range of power flow values among the plurality of online calculation result values related to the online calculation result information D11 created so far. A stepwise correlation formula is created based on the control amount to calculate the shedding amount, and the correction control setting information D12 is created by the stepwise correlation formula, so that the power flow value reflects the tendency of the system state in the time zone. Since the shedding amount is calculated using the correlation between the control amount and the control amount, the shedding amount related to the correction control settling information D12 can be calculated with higher accuracy.

Since the setting information deriving unit 202 calculates the shedding amount based on the online calculation result value belonging to the same time zone as the current time, it is possible to reduce the shortage of the control amount related to the shedding amount and Excessive amount can be reduced.

(2) Second Modification The settling information deriving unit 202 selects, among the plurality of online calculation result values related to the online calculation result information D11 created up to now, within the power flow range, at a date and time close to the current date and time. A stepwise correlation equation may be created based on the control amount related to the created online calculation result value to calculate the shedding amount, and the correction control settling information D12 may be created by the stepwise correlation equation.

The operation of the settling information derivation unit 202 according to the second modified example will be described with reference to FIG. Each of the plurality of online calculation result values related to the online calculation result information D11 includes data related to the created date and time.

It is assumed that each online calculation result value shown in FIG. 12B was created at a date and time close to the current date and time in the order of A, B, C, . . . The setting information derivation unit 202 creates a stepwise correlation formula based on the control amount related to the online calculation performance value of [A] created at the date and time closest to the current date and time, and creates correction control setting information D12. .

The setting information derivation unit 202 creates a stepwise correlation formula based on the control amount related to a plurality of online calculation result values created at a date and time close to the current date and time, and creates correction control setting information D12. good too. For example, the settling information derivation unit 202 creates a stepwise correlation equation based on the average value of the control amounts of the plurality of online calculation result values A, B, and C created at a date and time close to the current date and time, and corrects the correction control. You may make it create the setting information D12.

Alternatively, the settling information deriving unit 202 weights each of the online calculation result values A, B, C, . The correction control settling information D12 may be created by creating a stepped correlation formula based on the above. For example, the setting information derivation unit 202 assigns weights to each of the online calculation result values A, B, C, . The correction control settling information D12 may be created by multiplying the coefficients and creating a stepped correlation equation based on the control amount applied to a plurality of online calculation actual values.

The settling information derivation unit 202 selects the online calculation result values created at a date and time close to the current date and time within the range of power flow values among the plurality of online calculation result values related to the online calculation result information D11 created so far. Based on this control amount, a stepwise correlation formula is created to calculate the shedding amount, and the correction control settling information D12 is created by the stepwise correlation formula. Since the shedding amount is calculated using the correlation of the control amount, the shedding amount related to the correction control settling information D12 can be calculated more accurately.

Power equipment such as power supplies, circuit breakers, disconnecting switches, busbars, transmission lines, transformers, and phase modifying equipment in the power system 9, and configurations of power transmission paths may be changed. For this reason, the online calculation result value created at a date and time that is not close to the current date and time may not have been created for the current configuration of the power system 9 .

The setting information deriving unit 202 calculates the shedding amount based on the online calculation performance value created at a date and time close to the current date and time for the current configuration of the power system 9, so that the correction control setting information D12 can be obtained with higher accuracy. Such shedding amount can be calculated. As a result, it is possible to reduce the shortage of the control amount related to the shedding amount, and it is possible to reduce the excess of the control amount.

[2. Second Embodiment]
[2-1. Configuration and action]
A power system stabilization system 1 according to the second embodiment will be described. FIG. 13 shows a power system stabilization system 1 according to the second embodiment. The central control device 40 of the power system stabilization system 1 according to the first embodiment has the storage unit 306, but the central control device 40 of the power system stabilization system 1 according to the second embodiment has a storage unit 306 is different. Other configurations of the power system stabilization system 1 according to the second embodiment are the same as those of the power system stabilization system 1 according to the first embodiment.

A power system stabilization system 1 according to the second embodiment includes a central processing unit 10 , an accident detection terminal device 20 , a control terminal device 30 and a central control device 40 . The central processing unit 10 according to the second embodiment includes a system information acquisition unit 101, a system model creation unit 102, a selection target list creation unit 103, a power flow calculation transient stability calculation unit 104, a control table setting unit 105, online calculation performance information It has a recording unit 201 , a setting information derivation unit 202 , a setting information recording unit 203 , a storage unit 204 , a storage unit 205 and a storage unit 206 .

The central control unit 40 according to the second embodiment includes a system information acquisition unit 301, a selection target list creation unit 302, a backup control selection unit 303, an abnormality detection unit 304, a control table switching unit 305, a power flow change detection unit 401, a correction control It has a target determining unit 402 , an accident information receiving unit 500 , a control command output unit 600 , a storage unit 307 , a storage unit 403 , a storage unit 404 and a storage unit 405 .

The outline of the operation of the power system stabilization system 1 according to the second embodiment will be described below. In the following description, operations different from those of the power system stabilization system 1 according to the first embodiment will be described. Descriptions of operations similar to those of the power system stabilization system 1 according to the first embodiment will be omitted.

The central controller 40 of the power system stabilization system 1 according to the second embodiment receives the correction control setting information D12 derived by the central processing unit 10, sets the correction control setting information D12 as backup control setting information D45, and sets the backup control setting information D45. A backup control control table D42 is created based on the control settling information D45.

The central controller 40 of the power system stabilization system 1 according to the second embodiment does not have the storage unit 306 that stores the backup control correlation equation D41. The storage unit 403 of the central control unit 40 receives and stores the correction control setting information D12 from the storage unit 205 of the central processing unit 10 .

The central control unit 40 uses the backup control selection unit 303 to create a backup control control table D42 based on the selection target list received from the selection target list creation unit 302 and the correction control setting information D12 stored in the storage unit 403 . The backup control selection unit 303 uses the correction control setting information D12 as backup control setting information D45, and creates a backup control control table D42 based on the backup control setting information D45. The backup control control table D42 is a list showing the relationship between the amount of control required when an abnormality occurs in the central processing unit 10 and the power supply to be controlled.

Backup control selection section 303 calculates the required control amount using system information D21 and system information D31 received via system information acquisition section 301 and correction control setting information D12 stored in storage section 403 . The backup control selection unit 303 selects power generators to be electrically decoupled for backup control so that the control amount exceeds the required control amount using the selection target list received from the selection target list creation unit 302, and the backup control is performed. A control table D42 is created and stored in the storage unit 307. The backup control selection unit 303 may be configured by a software module.

The above is the configuration and operation of the power system stabilization system 1 according to the second embodiment.

[2-2. effect]
(1) According to this embodiment, the power system stabilization system 1 includes the central processing unit 10 and the central control unit 40 .

The central processing unit 10 has a power flow calculation transient stability calculation unit 104 that performs an analysis simulation of the control amount when the power supply to be controlled in the power system 9 is cut off, and the power flow calculation transient stability calculation unit 104. A control table setting unit 105 that creates a control table D13 indicating a control amount that is a combination of power sources to be cut off for each accident mode and the total value of the power generation output of the power sources based on the analysis simulation, and a power flow calculation transient stability calculation unit 104. A setting information deriving unit 202 that calculates the shedding amount for the power flow value based on the online calculation performance value including the power supply to be cut off and the control amount and the power flow value calculated by, and creates correction control setting information D12, The settling information deriving unit 202 derives a stepped correlation expression that indicates the control amount corresponding to the power flow value range based on a plurality of online calculation result values that have been created so far.

The central controller 40 corrects the control table D13 created by the control table setting unit 105 based on the correction control setting information D12 created by the setting information deriving unit 202 when detecting a change in power flow in the power system 9. It has a correction control object determination unit 402 that creates a post-correction control table D43, and controls the power supply according to the control amount applied to the post-correction control table D43 created by the correction control object determination unit 402. FIG.

As a result, it is possible to provide a power system stabilization system 1 that can calculate an appropriate shedding amount in which shortage and excess are reduced with respect to the required control amount. can.

According to the present embodiment, even if the state of the power system 9 changes and the required control amount changes suddenly, the central control unit 40 calculates the correction control setting information D12 generated by the setting information derivation unit 202. , the control table D13 created by the control table setting unit 105 is corrected, and the power source to be controlled in the electric power system 9 is controlled by an appropriate control amount. As a result, it is possible to control the power supply in the electric power system 9 with an appropriate control amount in which the shortage is reduced and the excess is reduced.

(2) According to the present embodiment, the central control unit 40, based on the correction control setting information D12 created by the setting information derivation unit 202, performs electric power control by backup control performed when an abnormality occurs in the central processing unit 10. A backup control selection unit 303 that creates a backup control control table D42 that is a list indicating the power supplies to be used, and when an abnormality occurs in the central processing unit 10, the backup control created by the backup control selection unit 303 Since the power supply is controlled based on the control table D42, the power supply in the power system 9 can be controlled with an appropriate amount of control even if the central processing unit 10 malfunctions.

According to the present embodiment, the correction control settling information D12 is used for backup control, so there is no need to set the set values for backup control by offline analysis. This reduces the work burden on the operator of the power system stabilization system 1 .

(2) According to the present embodiment, the power system stabilization system 1 includes a terminal device that detects changes in power flow in the power system 9, and the central controller 40 detects changes in power flow in the power system 9 using the terminal device. Since the detection is performed, the change in power flow in the electric power system 9 can be detected quickly and accurately. As a result, even when the power flow in the power system 9 changes sharply, the power system stabilization system 1 can control the power supply in the power system 9 with an appropriate amount of control.

[3. Other embodiments]
While embodiments including variations have been described, these embodiments are provided by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof. Below is an example.

(1) In the above embodiment, the system information acquisition unit 101 receives the system information D81 from the power supply information network 8, but the system information acquisition unit 101 receives the system information D81 via another information transmission medium. You may make it receive.

Reference Signs List 1... Power system stabilization system 10... Central processing unit 101... System information acquisition unit 102... System model creation unit 103... Selection target list creation unit 104... Power flow calculation transient stability Calculation unit 105 Control table setting unit 201 Online calculation result information recording unit 202 Setting information deriving unit 203 Setting information recording units 204, 205, 206 Storage unit 20 Accident detection terminal device 30 Control terminal device 40 Central control device 301 System information acquisition unit 302 Selection target list creation unit 303 Backup control selection unit 304 Abnormality detection unit 305... Control table switching unit 401... Power flow change detecting unit 402... Correction control target determining unit 500... Accident information receiving unit 600... Control command output unit 306, 307, 403, 404, 405 . . . Storage unit 8 .. Power supply information network 9 .. Power system

Claims (9)

A power flow calculation transient stability calculation unit that performs an analysis simulation of stability in the event of an accident in the power system;
Based on the analysis simulation performed by the power flow calculation transient stability calculation unit, a control amount that is the total value of the combination of power sources to be cut off to maintain the stability of the power system in the event of an accident and the output of the power sources is calculated. a control table setting unit that creates a control table showing
Setting for deriving setting information for calculating a shedding amount from the power flow value based on the online calculation result value including the power flow value for the analysis simulation and the control amount calculated by the power flow calculation transient stability calculation unit. an information derivation unit;
The settling information derivation unit calculates a control amount corresponding to a range of power flow values based on the plurality of online calculation result values created so far. to derive the formula,
Power system stabilization system. The settling information derivation unit derives a stepped correlation formula based on the maximum control amount in the range of the power flow value among the plurality of online calculation result values created so far,
The power system stabilization system according to claim 1. The settling information derivation unit is configured to calculate the control amount based on the online calculation result value belonging to the same time zone as the current time within the range of the power flow value among the plurality of online calculation result values created so far. Derive the stepped correlation equation,
The power system stabilization system according to claim 1. The settling information derivation unit determines the control amount for the online calculation result value created at a date and time close to the current date and time within the range of the power flow value, among the plurality of the online calculation result values created so far. Deriving a stepwise correlation equation based on
The power system stabilization system according to claim 1. A power flow calculation transient stability calculation unit that performs an analysis simulation of stability in the event of an accident in the power system;
Based on the analysis simulation performed by the power flow calculation transient stability calculation unit, a control amount that is the total value of the combination of power sources to be cut off to maintain the stability of the power system in the event of an accident and the output of the power sources is calculated. a control table setting unit that creates a control table showing
Setting for deriving setting information for calculating a shedding amount from the power flow value based on the online calculation result value including the power flow value for the analysis simulation and the control amount calculated by the power flow calculation transient stability calculation unit. an information derivation unit;
The settling information derivation unit calculates a control amount corresponding to a range of power flow values based on the plurality of online calculation result values created so far. to derive the formula,
a central processing unit;
When a change in power flow in the power system is detected, the control table created by the control table setting unit is corrected based on the correction control setting information created by the setting information deriving unit to create a corrected control table. has a correction control target determination unit that
controlling the power supply according to the power control amount applied to the post-correction control table created by the correction control target determination unit;
a central controller;
Power system stabilization system with Based on the correction control setting information created by the setting information derivation unit, the central control unit is for backup control, which is a list indicating power supplies to be de-energized to be used in backup control when an abnormality occurs in the central processing unit. a backup control selection unit that creates a control table, and performs control based on the backup control control table created by the backup control selection unit when an abnormality occurs in the central processing unit;
The power system stabilization system according to claim 5. The power system stabilization system includes a terminal device that detects changes in power flow in the power system,
The central control device detects a change in power flow in the power system by the terminal device,
The power system stabilization system according to claim 5 or 6. to the computer,
A power flow calculation transient stability calculation step for executing an analytical simulation of stability in the event of an accident in the power system;
Based on the analysis simulation performed by the power flow calculation transient stability calculation step, control indicating a control amount that is a combination of power sources to be shut down and the total output of the power sources to maintain stability of the power system when an accident occurs. a control table setting step causing table creation to occur;
Derivation of settling information for calculating a shedding amount from the power flow value based on the online calculation result value including the power flow value for the analysis simulation and the control amount calculated by the power flow calculation transient stability calculation step. and a setting information derivation step that causes
The setting information derivation step calculates a control amount corresponding to a range of power flow values based on the plurality of online calculation result values created so far. to perform the derivation of the formula,
A computer program for a power system stabilization system. A power flow calculation transient stability calculation procedure for performing an analytical simulation of stability in the event of an accident in the power system;
Based on the analysis simulation performed by the power flow calculation transient stability calculation procedure, control indicating a control amount that is a combination of power sources to be shut down and the total output of the power sources to maintain the stability of the power system in the event of an accident. a control table setting procedure for creating a table;
Setting for deriving setting information for calculating a shedding amount from the power flow value based on the online calculation result value including the power flow value for the analysis simulation and the control amount calculated by the power flow calculation transient stability calculation procedure. an information derivation procedure;
The setting information derivation procedure calculates a control amount corresponding to a range of power flow values based on a plurality of online calculation result values created so far. to derive the formula,
Power system stabilization method.

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