JP2019216510A - Power system stabilizing system and power system stabilizing method - Google Patents

Abstract

To perform further appropriate stabilization control upon a system accident of a power system.SOLUTION: A power system stabilizing system comprises a setting processing section, an accident type detection section, a control subject determination section and a control section. The setting processing section creates, for each of estimated accident types, a control table setting a control subject to be paralleled off from a power system. The accident type detection section detects an accident type corresponding to an accident that has occurred in the power system. The control subject determination section collates the accident type with the control table and determines a control subject corresponding to an estimated accident type which is matched with the accident type, as a control subject to be paralleled off from the power system. The control section performs control for paralleling off the determined control subject from the power system. Further, the setting processing section sets, for each of estimated accident types, a selection priority with respect to candidates of a control subject to be paralleled off from the power system among multiple control subjects and, in accordance with the set selection priority, selects a control subject capable of securing predetermined auxiliary power after being paralleled off from the power system.SELECTED DRAWING: Figure 2

Description

  Embodiments of the present invention relate to a power system stabilization system and a power system stabilization method.

  When an accident such as a lightning strike occurs in the power system, the accident elimination relay system performs an accident elimination at a high speed and in a minimum range, and the influence on the system is minimized. However, despite the operation of the accident elimination relay system, after the accident elimination due to the delay of the accident elimination time due to circuit breaker non-operation, etc. When the system configuration changes significantly, a sudden change in the power flow, a large supply and demand imbalance, and the like are caused, and an abnormal phenomenon of the system may occur. If left unchecked, the abnormal phenomenon that has occurred may spread to the entire power system, leading to a major power outage. For this reason, an accident propagation prevention relay system for preventing the occurrence of such an abnormal phenomenon beforehand or preventing the propagation of the phenomenon to the entire system is installed (for example, see Non-Patent Document 1, p5-6). .

  The accident propagation prevention relay system is generally called a “power system stabilization system” or a “power system stabilization device”, and is an abnormal phenomenon (for example, a step-out phenomenon, a frequency abnormality, a voltage abnormality) that can occur in a target power system. There are various types according to abnormalities and overloads. The step-out phenomenon is, for example, a phenomenon in which the balance between the mechanical input and the electrical output of the synchronous generator is lost due to a voltage drop at the time of an accident, and the generator cannot maintain synchronous operation. If this step-out phenomenon is neglected, a large number of generators may be shut down in a chain, which may spread to a wide area power outage. The following describes a power system stabilization system that prevents a step-out phenomenon between generators and systems. In a power system stabilization system that prevents the occurrence of step-out phenomena, the effect of a system accident is spread to the entire system by restricting the power supply to forcibly disconnect some generators from the power system. To prevent Disconnection means, for example, disconnecting the generator from the power system.

  Here, a conventional power system stabilization system will be described. In the description of the conventional power system stabilization system, FIG. 14 is a configuration diagram of the power system 1 including the conventional power system stabilization system. The power system 1 includes, for example, a power system E and a power system stabilization system 10. Here, the power system E includes a plurality of generators G1 to GN (N: a natural number of 2 or more). Each of the generators G1 to GN generates electric power to be supplied to the electric power system E. The generators G1 to GN are, for example, a nuclear power generator, a hydraulic power generator, a thermal power generator, a wind power generator, a solar power generator, and the like. Hereinafter, among the generators G1 to GN of the entire system, a plurality of generators installed in one power plant will be described as G1 to Gn (n; a natural number of 2 or more).

  In the example of FIG. 14, the power system E includes generators G1 to Gn, circuit breakers CB1-1 to CB1-n, CB2-1, and CB2-2, and current measuring devices CT1-1 to CT1-n, CT2. -1, and CT2-2, and the accident elimination relay systems AR-1, AR-2. Hereinafter, since each of the circuit breakers CB1-1 to CB1-n has the same function, when it is not necessary to distinguish between the circuit breakers, the symbols after the hyphen indicating which circuit breaker is omitted. However, the description will be made with reference to “the circuit breaker CB1”. The same applies to other configurations. Further, a transformer may be connected to the transmission line L1.

  In FIG. 14, each of the generators G1 to Gn and the bus B1 are connected by a transmission line L1. A circuit breaker CB1 and a current measuring device CT1 are connected in series to the transmission line L1 in association with each of the generators G1 to Gn. The current measuring device CT1 measures a current value flowing through the transmission line L1. Voltage measurement device VT1 measures the voltage of bus B1. The circuit breaker CB1 controls interruption or passage of electric power flowing through the transmission line L1. By performing the cutoff by the circuit breaker CB1, the generator connected to the bus B1 can be disconnected from the power system E. Circuit breaker CB1 is controlled by control device 300 of power system stabilization system 10.

  The bus B1 and the bus B2 are connected by two parallel transmission lines L2. The current measuring device CT2 measures a current value flowing through each transmission line L2. Voltage measurement device VT2 measures the voltage of bus B2. The circuit breaker CB2 disconnects the transmission line L2 from the bus B1 and the bus B2, for example, under the control of the accident elimination relay system AR, and eliminates the accident.

  The power system stabilization system 10 stabilizes the remaining generators by disconnecting (cutting off) some of the generators from the power system, for example, a phenomenon in which the generator steps out due to an accident in the power system E or the like. And maintain stable operation of the power system E. The power system stabilization system 10 includes, for example, a central processing unit 110, a central control device 150, an accident detection device 200, and a control device 300. The central processing unit 110, the central control device 150, the accident detection device 200, and the control device 300 are connected by communication equipment such as signal lines.

  The central processing unit 110 is installed at a location that can be connected to the power supply information network N, such as a central power supply command center or a system control station, so that system information can be obtained online. The system information is, for example, information relating to the connection state of the power system E, the supply / demand state of power, and the power flow state. Specifically, the on / off state of a circuit breaker or the like, the generator output, the power flowing through a transmission line, the bus, and the like. It is an electric quantity such as a voltage.

  The central processing unit 110 presumes an accident and a system phenomenon in the electric power system E, and based on contents set in advance (hereinafter referred to as assumed accident contents), sets a control operation using system information before the accident to perform control operation. Performs type processing. Here, the pre-computation type is classified into, for example, an offline pre-computation type and an online pre-computation type (for example, see Non-Patent Document 1, p52, p54, and p55). The offline pre-calculation type determines the control target based on the offline transient stability calculation, whereas the online pre-calculation type performs the transient stability calculation using system information (online data) obtained online. In that the control target is determined. The transient stability calculation means, for example, that the stability calculation is performed on the content of the assumed accident to determine the situation of the occurrence of the abnormal phenomenon at the time of the occurrence of the assumed accident, and when the abnormal phenomenon occurs and the power system E becomes unstable, This is a simulation calculation for determining control contents necessary for maintaining the stability of the power system E by simulating and repeatedly performing control such as power supply restriction. The offline pre-computation type and the online pre-computation type store a control table in which a control target is set in advance with respect to identification information (hereinafter, referred to as an assumed accident type) for identifying the contents of an assumed accident. The common point is that control is performed by comparing the type with the assumed accident type in the control table. Hereinafter, the power system stabilization system 10 will be described as an online pre-calculation type system stabilization system.

  For example, the central processing unit 110 sets, in the control table, information indicating a control device necessary for maintaining the stabilization of the power system E for each assumed accident type. For example, in order to prevent the effects of a system accident from spreading to the entire system, a power system is forcibly disconnected from the system and some of the generators are subject to the power system restriction. The selected generator. The electrical control is an example of a control target in the power system stabilization system.

  The central control device 150 is installed, for example, at a location where communication with other devices (the central processing unit 110, the accident detection device 200, and the control device 300) is possible. For example, the central control device 150 may be installed at the same place as the accident detection device 200 and the control device 300. Further, the central control device 150 may be configured to include the functions of the accident detection device 200 and the control device 300. The central control device 150 determines the control content corresponding to the accident type from the plurality of control contents set by the central processing unit 110 when the accident detection device 200 detects the accident with respect to the power system E, and determines Post-computation-type processing is performed to output the control contents thus obtained to the control device 300. Specifically, the central controller 150 receives the control table transmitted from the central processing unit 110 at regular intervals, saves the latest one, and stores the latest type in the accident type transmitted from the accident detector 200 when an accident occurs. Is received, and the accident type is compared with the control table to determine a control device corresponding to the coincident accident type. Then, information on the electrical control determined by central control device 150 is output to control device 300.

  The accident detection device 200 is installed in, for example, a substation. The accident detection device 200 fetches, for example, an electric quantity, an ON / OFF state of the circuit breaker CB2, and operation information of the accident elimination relay system AR from the current measuring device CT2 and the voltage measuring device VT2. Further, the accident detection device 200 detects the occurrence of a system accident based on the measurement results of the current measuring device CT2 and the voltage measuring device VT2, the state change of the circuit breaker CB2, and the operation information of the accident eliminating relay system AR, and detects the detected accident. Is determined, and information on the determined accident type is transmitted to the central control device 150.

  The control device 300 is installed in, for example, a power plant. The control device 300 controls the circuit breaker CB1 and performs control for disconnecting the electrical control from the power system E based on a cutoff command or the like obtained from the central control device 150.

  Next, details of the power system stabilization system 10 will be described. FIG. 15 is a configuration diagram of a power system stabilization system 10 according to a conventional embodiment. The central processing unit 110 illustrated in FIG. 15 includes, for example, a system information collection unit 111, a system model creation unit 112, a condition setting unit 113, and a setting processing unit 114. The system information collection unit 111 collects system information of the power system E via the power supply information network N, and outputs the collected system information to the system model creation unit 112.

  The system model creation unit 112 creates an analysis system model representing the current power flow state based on the system information collected by the system information collection unit 111 and the system equipment data.

  The condition setting unit 113 sets a plurality of analysis conditions corresponding to the assumed accident in the power system E based on the analysis system model created by the system model creating unit 112. Specifically, the condition setting unit 113 includes, for example, a system model storage unit 113a, an assumed accident type storage unit 113b, and an analysis condition setting unit 113c. The system model storage unit 113a and the assumed accident type storage unit 113b respectively include, for example, a hard disk drive (HDD), a flash memory, an electrically erasable programmable read only memory (EEPROM), a read only memory (ROM), or a random access memory (RAM). Memory).

  The system model storage unit 113a stores the analysis system model created by the system model creation unit 112. The assumed accident type storage unit 113b stores, for example, assumed accident type data.

  The setting processing unit 114 performs a transient stability calculation based on each analysis condition set by the condition setting unit 113, determines the stability of the power system for each analysis condition, and an accident in each accident type has occurred. At this time, a control required for maintaining the stability of the power system E is set as a control table. The setting processing unit 114 includes, for example, an analysis condition storage unit 114a, a transient stability calculation unit 114b, a stability determination unit 114c, a control unit selection unit 114d, and a control table setting unit 114e.

  The analysis condition storage unit 114a includes, for example, an HDD, a flash memory, an EEPROM, a ROM, a RAM, or the like. The analysis condition storage unit 114a stores each analysis condition set by the condition setting unit 113. The transient stability calculation unit 114b performs a transient stability calculation for each analysis condition stored in the analysis condition storage unit 114a. The stability determination unit 114c determines the stability under each analysis condition using the calculation result by the transient stability calculation unit 114b. The electronic control unit selecting unit 114d selects an electronic control unit necessary for maintaining the stability of the electric power system when each of the assumed accident types occurs.

  The control table setting unit 114e sets a control device selection result determined by the control device selection unit 114d as a control table.

  FIG. 16 is a flowchart illustrating an example of processing executed in the conventional central processing unit 110 (for example, see Non-Patent Document 1, p. 88). The system information collecting unit 111 collects system information from the power system E via the power supply information network N (step S100). Next, the system model creation unit 112 creates a model for analysis of the power system E by performing state estimation calculation, system reduction, and the like based on the collected system information (step S200).

  Next, the condition setting unit 113 sets an analysis condition based on the assumed accident (step S300). Next, the setting processing unit 114 performs a transient stability calculation based on the set analysis conditions (step S400). Next, the setting processing unit 114 determines whether or not the power system E is stable based on the calculation result of the transient stability (Step S500). When it is determined that the power system E is not stable, the setting processing unit 114 performs a process of selecting a control device (step S600), and calculates the transient stability under the analysis condition including the condition of limiting the power supply. To return to the process of step S400. In the process of S600, the setting processing unit 114 controls the generator group that is determined to be unstable for a predetermined time ΔT from the time when the generator is initially determined to be unstable according to predetermined determination conditions. The acceleration energy of each of the selected generators is calculated as a power control effect index AE. Next, the power control effect index AE is corrected by using the weighting coefficient in consideration of the operation constraint, and the generator with the largest corrected power control effect index AE is selected as an additional power control (for example, Non-Patent Document 1). , P89, p91, p92 and Non-Patent Document 2). In the case of the off-line pre-calculation type, as another method, the selection priority order of the generator in which the control device 300 is installed is determined in advance and set in a table, and the total value of the generator output is controlled. The priority table method, which selects electrical control units in order of selection priority until the amount exceeds the limit, the optimal method, which searches for the minimum control amount combination that exceeds the required control amount, and the sub-optimal method, which selects the optimal one from the narrowed combinations (For example, see Non-Patent Document 3, pages 163-164). The generator output is measured by the control device 300 and transmitted to the central processing unit 110 (see Non-Patent Document 1, p. 74).

  When it is determined that the power system E is stable, the setting processing unit 114 determines whether or not the processing for all cases of the assumed accident (analysis model) has been completed (step S700). If the processing has not been completed for all cases, the process returns to step S300, and the subsequent processing is performed. In addition, when the processing for all cases is completed, the setting processing unit 114 outputs a control table in which the electric control has been set (step S800). Thus, the processing of this flowchart ends.

  The central control device 150 includes, for example, an electronic control unit determination unit (an example of a control target determination unit) 151. The electronic control unit determination unit 151 includes, for example, a control table storage unit 151a and a collation processing unit 151b. The control table storage unit 151a includes, for example, a flash memory, a RAM, and the like. The control table storage unit 151a stores the control table set by the setting processing unit 114. The collation processing unit 151b collates the accident type detected by the accident type detection unit 210 with the control table stored in the control table storage unit 151a, and determines the electric machine corresponding to the coincident accident type. In addition, the matching processing unit 151b transmits information on the determined electrical control device to the control device 300.

  The accident detection device 200 includes, for example, an accident type detection unit 210. The accident type detection unit 210 detects occurrence of an accident in the power system E. The accident type detection unit 210 determines the type of the accident based on the content of the detected accident. Then, the accident type detection unit 210 transmits information on the determined accident type to the central control device 150.

  The control device 300 includes, for example, a control unit 310. The control unit 310 controls the transmission line connected to the electrical breaker among the circuit breakers CB1-1 to CB1-n in order to disconnect the electronic control unit determined by the electronic control unit determination unit 151 from the power system E. A break command is output to the circuit breaker connected to L1, and control is performed to disconnect the electrical control from the power system E.

  In the above-described conventional power system stabilization system, when the power supply is restricted, the supply-demand balance between the power generation (supply) and the load (demand) is disrupted. The abnormal frequency drop phenomenon is prevented. The reserve is, for example, a supply capacity that exceeds the demand in order to secure power supply even in the event of a power loss accident or an increase in demand (for example, Non-Patent Document 4, p17-18 and Non-Patent Documents). 5, p1150, p1251). However, when the power supply of a large number of generators is limited, the reserve capacity is reduced, so that the frequency after the limited power supply may drop abnormally, or the frequency of the renewable energy power generation may fluctuate due to fluctuations in output or demand. Was.

Technical Report No. 801 of the Institute of Electrical Engineers of Japan, "Relay technology for system out-of-step / accident propagation prevention", The Institute of Electrical Engineers of Japan, October 2000 "Development of a backbone integrated online power system stabilization system (ISC) adapted to the next generation grid", IEEJ Transactions on Electric Power and Energy, Vol. 137, NO. 6, p434-445, 2017 "Power System Stabilization System Engineering", The Institute of Electrical Engineers of Japan, February 5, 2014 Technical Report of the Institute of Electrical Engineers of Japan No. 1127, "Technique to prevent accident propagation using frequency relay system", The Institute of Electrical Engineers of Japan, September 2008 "Electrical Engineering Handbook (7th edition)", The Institute of Electrical Engineers of Japan, September 2013

  The problem to be solved by the present invention is to provide a power system stabilization system and a power system stabilization method that can perform more appropriate stabilization control for a power system fault.

  The power system stabilization system according to the embodiment includes a setting processing unit, an accident type detection unit, a control target determination unit, and a control unit. The setting processing unit creates a control table in which a control target to be disconnected from the power system is set from among a plurality of control targets for supplying power to the power system for each assumed accident type. The accident type detection unit detects an accident type corresponding to an accident that has occurred in the power system. The control object determination unit compares the accident type detected by the accident type detection unit with the control table set by the setting processing unit, and controls the control object associated with the assumed accident type that matches the accident type. Is determined as a control target to be disconnected from the power system. The control unit performs control for disconnecting the control target determined by the control target determination unit from the power system. Further, the setting processing unit, for each of the assumed accident types, among the plurality of control objects, set a selection priority for the candidate of the control object to be disconnected from the power system, according to the set selection priority, A control target that can secure a predetermined reserve after disconnection from the power system is selected.

1 is a configuration diagram of a power system 1 including a power system stabilization system according to a first embodiment. FIG. 1 is a configuration diagram of a power system stabilization system 10 according to a first embodiment. The figure which shows an example of the content of the assumed accident type data of 1st Embodiment. FIG. 4 is a diagram illustrating an example of the contents of a control table according to the first embodiment. 5 is a flowchart illustrating an example of a process performed by the central processing unit 110-1 according to the first embodiment. FIG. 2 is a configuration diagram of a reserve force calculation unit 115-1 according to the first embodiment. The figure which shows an example of the content of the generator data 115d-1 of 1st Embodiment. FIG. 9 is a diagram for explaining the contents of a calculation result by the calculation unit 115b-1 according to the first embodiment. 5 is a flowchart for describing processing of the electrical machine selection unit 114d-1 according to the first embodiment. FIG. 4 is a diagram illustrating an example of the contents of a selection priority table according to the first embodiment. The block diagram of the electric power system stabilization system 10 of 2nd Embodiment. 9 is a flowchart illustrating an example of a process performed by a central processing unit 110-2 according to the second embodiment. The block diagram of the electric power system stabilization system 10 of 3rd Embodiment. The block diagram of the electric power system 1 containing the conventional electric power system stabilization system. The block diagram of the conventional electric power system stabilization system 10. 9 is a flowchart illustrating an example of a process executed in a conventional central processing unit 110.

  Hereinafter, a power system stabilization system and a power system stabilization method according to an embodiment will be described with reference to the drawings. In the following description, configurations corresponding to the respective functional configurations of the above-described conventional power system 1 will be given the same names and reference numerals, and detailed description of the functions will be omitted. In addition, some components are denoted by reference numerals with hyphens so that differences from the related art or other embodiments are clear.

(1st Embodiment)
FIG. 1 is a configuration diagram of a power system 1 including a power system stabilization system according to the first embodiment. The power system 1 shown in FIG. 1 is different from the power system shown in FIG. 14 in that an automatic power supply system EMS is added and a central processing unit 110-1 is provided instead of the central processing unit 110. Therefore, the following mainly describes the automatic power supply system EMS and the central processing unit 110-1.

  The automatic power supply system EMS (EMS: Energy Management System) takes in information such as the outputs of the generators G1 to GN, the power flow, voltage, and frequency of the power system E, and economically operates the generators G1 to GN, adjusts the frequency, Performs power supply operations such as voltage control and recording, statistical processing, and supply and demand planning. In addition, the automatic power supply system EMS performs control and the like in power supply and demand operation. The control in the supply and demand operation is, for example, controlled so as to maintain the frequency of the power system E within the reference value while balancing the demand and the supply power with the generator output in accordance with the power demand that changes with time. That is. The supply amount control for short-period demand fluctuations is performed by load frequency control (LFC), and the supply amount control for relatively long-period demand fluctuations is controlled by economic load dispatching control (EDC; Economic Load Dispatching). Control). In the example of FIG. 1, the automatic power supply system EMS is connected between the power supply information network N and the central processing unit 110-1. The generators G1 to Gn are an example of a “control target” (for example, see Non-Patent Document 5, p1158).

  For example, the power system stabilization system 10 disconnects (shuts off) some of the generators from the power system at a high speed to prevent the generator from stepping out due to an accident or the like in the power system E, thereby removing the remaining generators. Stabilize and maintain stable operation of the power system E. The power system stabilization system 10 includes, for example, a central processing unit 110-1, a central control device 150, an accident detection device 200, and a control device 300. These components are realized, for example, by a hardware processor such as a CPU (Central Processing Unit) executing a program (software). Some or all of these constituent elements are hardware (such as a large scale integrated circuit (LSI), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a graphics processing unit (GPU)). (Including a circuit section), or may be realized by cooperation of software and hardware. The program may be stored in a storage device such as an HDD or a flash memory in advance, or may be stored in a removable storage medium such as a DVD or a CD-ROM. It may be installed in a storage device. The automatic power supply system EMS, the central processing unit 110-1, the central control device 150, the accident detection device 200, and the control device 300 are connected by communication equipment such as signal lines.

  The central processing unit 110-1 is installed at a place that can be connected to the power supply information network N, such as a central power supply command center or a system control station, so that system information can be obtained online. For example, the central processing unit 110-1 sets, in the control table, information indicating a control device necessary for maintaining the stabilization of the power system E for each assumed accident type. For example, in order to prevent the effects of a system accident from spreading to the entire system, a power system is a power system that forcibly disconnects some generators from the system (electric system). Generators that are selected for restriction. Also, when creating the control table, the central processing unit 110-1 sets the selection priority of the candidate for the electrical control for each assumed accident type, and disconnects from the power system according to the set selection priority. After that, a control device capable of securing a predetermined reserve power is selected. The predetermined reserve is a reserve of a predetermined amount (for example, 3 to 5% of the maximum demand of the day). Further, the predetermined amount may be changed based on, for example, the type of the generator that is responsible for the supply power and the situation of the change in demand. Details of the control table will be described later.

  Next, details of the power system stabilization system 10 of the first embodiment will be described. FIG. 2 is a configuration diagram of the power system stabilization system 10 according to the first embodiment. The central processing unit 110-1 shown in FIG. 2 includes, for example, a system information collection unit 111-1, a system model creation unit 112-1, a condition setting unit 113-1, a setting processing unit 114-1, and a reserve And a calculation unit 115-1. The system information collection unit 111-1 collects system information of the power system E via the power supply information network N. The system information is supplied from the power system E to the power supply information network N using a monitoring control system and a communication line installed in a power plant or a substation at a fixed cycle or when the system information changes. The system information collection unit 111-1 outputs the collected system information to the system model creation unit 112-1.

  The system model creation unit 112-1 creates an analysis system model representing the current power flow state based on the system information and the system equipment data collected by the system information collection unit 111-1. The system equipment data includes, for example, transmission line, impedance of transformer, constants of generators G1 to GN, and data of a governor of the generator and an excitation control device.

  The condition setting unit 113-1 sets a plurality of analysis conditions corresponding to the assumed accident in the power system E based on the analysis system model created by the system model creation unit 112-1. Specifically, the condition setting unit 113-1 includes, for example, a system model storage unit 113a-1, an assumed accident type storage unit 113b-1, and an analysis condition setting unit 113c-1. The system model storage unit 113a-1 and the assumed accident type storage unit 113b-1 are each configured by, for example, an HDD, a flash memory, an EEPROM, a ROM, a RAM, or the like.

  The system model storage unit 113a-1 stores the analysis system model created by the system model creation unit 112-1. The assumed accident type storage unit 113b-1 stores, for example, assumed accident type data. FIG. 3 is a diagram illustrating an example of the content of the assumed accident type data according to the first embodiment. In the assumed accident type data, information (for example, line A 6LG-O) relating to the contents of the accident (for example, disconnection of the route of the two-line transmission line) is associated with the assumed accident type in the power system E. The analysis condition setting unit 113c-1 changes the combination of the electrical control units using, for example, the analysis system model and the assumed accident type data stored in the system model storage unit 113a and the assumed accident type storage unit 113b-1, respectively. To set multiple analysis conditions.

  The setting processing unit 114-1 performs a transient stability calculation based on each analysis condition set by the condition setting unit 113-1, determines the stability of the power system with respect to each analysis condition, and When an accident occurs, a control required for maintaining the stability of the power system E is set as a control table. The setting processing unit 114-1 includes, for example, an analysis condition storage unit 114a-1, a transient stability calculation unit 114b-1, a stability determination unit 114c-1, a control unit selection unit 114d-1, and a control table. And a setting unit 114e-1.

  The analysis condition storage unit 114a-1 is configured by, for example, an HDD, a flash memory, an EEPROM, a ROM, a RAM, or the like. The analysis condition storage unit 114a-1 stores each analysis condition set by the condition setting unit 113-1. The transient stability calculation unit 114b-1 performs a transient stability calculation for each analysis condition stored in the analysis condition storage unit 114a-1. The stability determination unit 114c-1 determines the stability under each analysis condition using the calculation result by the transient stability calculation unit 114b-1. The electric machine selection unit 114d-1 selects electric machines necessary for maintaining the stability of the electric power system when each assumed accident type occurs.

  The control table setting unit 114e-1 sets the control device selection result determined by the control device selection unit 114d-1 as a control table. FIG. 4 is a diagram illustrating an example of the content of the control table according to the first embodiment. In the control table shown in FIG. 4, information on the electrical control unit is associated with each assumed accident type.

  The reserve power calculation unit 115-1 calculates the target value and the current value of the reserve power in the entire system, and the reserve power of each generator, based on the maximum demand and the reserve power set value acquired from the automatic power supply system EMS. . The reserve power calculation unit 115-1 outputs the calculation result to the setting processing unit 114-1.

  FIG. 5 is a flowchart illustrating an example of a process executed in the central processing unit 110-1 according to the first embodiment. The flowchart shown in FIG. 5 is different from the flowchart shown in FIG. 16 in that the process of step S350 is added between step S300 and step S400, and has the process of step S900 instead of step S600. Therefore, the following mainly describes the processing of step S350 and step S900.

  After the processing in step S300, the setting processing unit 114-1 initializes a decrease in reserve power (addition value to be described later), which is a calculation result by the reserve power calculation unit 115-1, (step S350). A transient stability calculation is performed based on the analysis conditions (step S400). Next, the setting processing unit 114-1 determines whether or not the power system E is stable based on the calculation result of the transient stability (step S500). If it is determined that the power system E is not stable, the setting processing unit 114-1 performs a process of selecting the electrical control device according to the first embodiment (step S900), and adds a condition for power supply restriction. The process returns to step S400 to calculate the transient stability under the analysis conditions. Details of the processing of step S900 will be described later.

  The central control device 150 includes, for example, an electronic control unit determination unit (an example of a control target determination unit) 151. The electronic control unit determination unit 151 includes, for example, a control table storage unit 151a and a collation processing unit 151b. The control table storage unit 151a includes, for example, a flash memory, a RAM, and the like. The control table storage unit 151a stores the control table set by the setting processing unit 114-1. The collation processing unit 151b collates the accident type detected by the accident type detection unit 210 with the control table stored in the control table storage unit 151a, and determines the electric machine corresponding to the coincident accident type. In addition, the matching processing unit 151b transmits information on the determined electrical control device to the control device 300.

  Next, details of the function of the reserve power calculation unit 115-1 will be described. FIG. 6 is a configuration diagram of the reserve power calculation unit 115-1 according to the first embodiment. The reserve power calculation unit 115-1 includes, for example, an input unit 115a-1, a calculation unit 115b-1, an output unit 115c-1, and generator data 115d-1. The input unit 115a-1 receives the input of the maximum demand of the day and the reserve power set value from the automatic power supply system EMS. The input unit 115a-1 receives an input of the output PG of the generators G1 to GN from the system information collection unit 111. Note that the outputs PG of the generators G1 to GN may be measured by the control device 300 and acquired via the central control device 150. Further, the maximum demand and the reserve power set value may be acquired from the system information collection unit 111-1 via the power supply information network N, for example. The reserve setting value may be recorded in, for example, the central processing unit 110-1.

  Here, the reserve capacity corresponds to, for example, a spinning reserve for coping with a supply-demand imbalance caused by a power loss accident or the like, and a supply-demand imbalance caused by a sudden change in demand due to a sudden change in weather or the like. Operational Reserve. Each reserve has a reserve (increase allowance) in the direction of increasing the generator output and a reserve (increase) in the direction of decreasing the generator output. Usually, the target value (required amount) of each reserve power is set as a ratio [%] to the maximum demand. Further, the target value (required amount) of each reserve force can be defined by an absolute value [MW]. The operator of the power system, for example, formulates an operation plan of the generator so as to secure 3 to 5% or more of the maximum demand of the day by combining the spinning reserve and the exercise reserve. The spinning reserve is secured by hydraulic power and governor-free operation of the thermal power generator, and the operating reserve is secured by hydraulic power during partial load operation and the remaining power of the thermal power generator (for example, Non-Patent Document 4, p17- 18 and Non-Patent Document 5, p1150, p1251).

  For example, the data input by the input unit 115a-1 includes the maximum demand ΣPLmax [MW] in the power system E, the set value of the spinning reserve (increase allowance) S_SR_R [%], and the set value of the spinning reserve (decrease allowance). ) S_SR_L [%], set value of operation reserve power (increase allowance) S_OR_R [%], set value of operation reserve force (decrease allowance) S_OR_L [%], generator output PG (i) [MW] (i = 1) To N). In addition, i shows the generator number which identifies a generator, and N shows the number of generators.

  The calculation unit 115b-1 calculates a target value and a current value of the reserve power in the entire system based on the information input by the input unit 115a-1 and the generator data 115d-1. FIG. 7 is a diagram illustrating an example of the content of the generator data 115d-1 according to the first embodiment. The generator data 115d-1 includes, for example, a maximum output, a minimum output, a load limit value, an LFC upper limit, an LFC lower limit, and an operation mode of the governor (eg, governor-free operation (GF operation) or load limiter). Operation (LL operation)) is associated therewith. The generator data 115d-1 may be received from the automatic power supply system EMS at a predetermined timing such as a fixed period, and may be updated at the received timing.

The calculation unit 115b-1 calculates the target value [MW] of the reserve capacity of the entire system using the equations (1) to (4).
Target value of spinning reserve (increase allowance) T_SR_R = ΣPLmax × S_SR_R (1)
Target value (reduction allowance) of spinning reserve T_SR_L = ΣPLmax × S_SR_L (2)
Target value of operating reserve (increase allowance) T_OR_R = ΣPLmax × S_OR_R (3)
Target value of operating reserve (lowering allowance) T_OR_L = ΣPLmax × S_OR_L (4)

Further, the calculation unit 115b-1 obtains the reserve capacity of each generator, and calculates the total value as the reserve capacity of the entire system. The calculation unit 115b-1 obtains the reserve power [MW] of each generator using the equations (5) to (8) (for example, see Non-Patent Document 4, p95).
Spinning reserve (raising allowance) SR_R (i) = PGmax (i)-PG (i) ... (5)
Spinning reserve (reduction allowance) SR_L (i) = PG (i)-PGmin (i) ... (6)
Operating reserve (raising allowance) OR_R (i) = LFCmax (i)-PG (i) ... (7)
Operating reserve (lowering allowance) OR_L (i) = PG (i)-LFCmin (i) ... (8)
Here, PGmax (i) indicates the maximum output [MW], PGmin (i) indicates the minimum output [MW], LFCmax (i) indicates the LFC upper limit [MW], and LFCmin (i) indicates the LFC lower limit [MW]. MW], and PG (i) indicates the generator output [MW]. I indicates a generator number (i = 1 to N), and N indicates the number of generators. In the case of the LL operation, the maximum output is limited by the load limit value. Therefore, the calculation unit 115b-1 obtains the spinning reserve (raising allowance) by Expression (9) (for example, see Non-Patent Document 5, p1150, and p1251).
Spinning reserve (raising allowance) SR_R (i) = 77M (i)-PG (i) ... (9)
Here, 77M (i) indicates the load limit value [MW].

Further, the calculation unit 115b-1 obtains the current reserve power [MW] of the entire system using the equations (10) to (13).
Current value of spinning reserve (increase allowance) P_SR_R = ΣSR_R (i), i = 1 to N (10)
Current value of spinning reserve (lowering allowance) P_SR_L = ΣSR_L (i), i = 1 to N (11)
Current value (increase allowance) of operating reserve P_OR_R = ΣOR_R (i), i = 1 to N (12)
Current value of operating reserve (lowering allowance) P_OR_L = ΣOR_L (i), i = 1 to N (13)
In the following, for convenience of explanation, only the operation of securing the reserve force in the upward direction (increase allowance) will be described. However, the operation of securing the reserve force in the downward direction (lower allowance) is the same except that the polarity is different from the upward direction. Can be realized.

  FIG. 8 is a diagram for explaining the contents of the calculation result by the calculation unit 115b-1 according to the first embodiment. In the example of FIG. 8, a spinning reserve (up direction) and an operation reserve (up direction) are associated with the generator. As shown in FIG. 8, the calculation unit 115b-1 calculates reserve power for each of the generators G1 to GN.

  The output unit 115c-1 outputs the target value and the current value of the reserve capacity of the entire system calculated by the calculation unit 115b-1 and the reserve capacity of each generator to the electric machine selection unit 114d-1.

Next, the details of the function of the electrical control selecting unit 114d-1 in the setting processing unit 114-1 will be described. FIG. 9 is a flowchart for explaining the processing of the electronic control unit selecting unit 114d-1 according to the first embodiment. The processing illustrated in FIG. 9 corresponds to, for example, the processing of step S900 in FIG. 5 described above. First, the electronic control unit selecting unit 114d-1 determines, for example, from the time when the generator is initially determined to be unstable based on the determination conditions of Expressions (14) and (15) until a certain time ΔT elapses. During this period, the generator group determined to be unstable is selected as a candidate for the electrical control unit (step S902).
{Δi (t) -δs (t)} ≧ δk (14)
｛Δi (t) −δs (t)｝ ≧ δk and ｛ωi (t) −ωs (t)｝ ≧ ωk (15)
Here, δi and ωi indicate the internal phase angle and angular velocity of the generator of the power system E. Further, δs and ωs indicate the internal phase angle and angular velocity of the reference generator. In the expressions (14) and (15), i indicates a generator number (i = 1 to N), and N indicates the number of generators. Further, t indicates a simulation time in the transient stability calculation, and δk and ωk indicate threshold values.

Next, the electrical machine selecting unit 114d-1 calculates, for example, the acceleration energy of each generator selected as an electrical machine candidate as the electrical efficiency indicator AE (step S904). Further, the electrical control selecting unit 114d-1 corrects the electrical control effect index AE by using a weight coefficient in consideration of a preset operation constraint (Step S906). In the process of step S906, for example, the power control effect index AE is corrected using Expression (16).
AEi ′ = AEi × Ci (16)
Here, AEi indicates the power control index before the correction of the generator i, AEi 'indicates the power control index after the correction of the generator i, and Ci indicates the weight coefficient of the generator i. When there are a plurality of generators (for example, generators whose index difference is within a predetermined range) with a similar power control effect index AE, the electrical control selecting unit 114d-1 reflects the selection priority in consideration of the operation aspect. May be selected. To reflect the selection priority in consideration of the operation aspect means, for example, to assign a weighting factor so that the thermal power generator is preferentially selected over the nuclear power generator in the power generator. In addition, the control unit selection unit 114d-1 selects and selects, for example, a thermal power generator with a high power generation cost even with the same thermal power generator or a generator that can be restarted in a short time after being controlled. Weighting coefficient may be assigned to the data. Then, the electronic control unit selecting unit 114d-1 sets the selection priority from the one with the larger corrected electric control effect index AE obtained by the processing of Step S906, and selects the selection priority and the reserve power calculation unit 115-1. In step S908, a table (selection priority table) in which the candidates for the electrical control are arranged in descending order of the selection priority is generated by associating the reserve with the reserve power of each generator calculated in step S908.

  FIG. 10 is a diagram illustrating an example of the contents of the selection priority table according to the first embodiment. In the selection priority table, the generator, the internal phase angle difference, the angular velocity difference, the corrected power control effect index, the spinning reserve (up direction), and the operation reserve (up direction) are associated with the selection priority. Have been. Note that the selection priority table in FIG. 10 does not include a generator that has already been selected as a control.

Next, the electrical machine selection unit 114d-1 initializes the variable j of the selection priority (j ← 0) (step S910), and increases 1 to the variable j (j ← j + 1) (step S912). Next, the electric machine selection unit 114d-1 uses the equations (17) and (18) to calculate the decrease in the reserve capacity when the generator with the selection priority j is added to the electric machine. The calculation is performed (step S914). For example, when the selection priority is the first, the electrical machine selection unit 114d-1 refers to the selection priority table of FIG. 10 and refers to the reduction of the reserve power when the generator G1 is added to the electrical power. Is calculated.
Decrease in spinning reserve R_SR_R = R_SR_R + SR_R (j) ... (17)
Reduction in operating reserve R_OR_R = R_OR_R + OR_R (j) ... (18)
Note that, as shown in step S350 in FIG. 5, the amount of decrease in the reserve force is initialized using the equations (19) and (20) in the first processing of the setting processing unit 114-1.
Initialization of reduction of spinning reserve R_SR_R = 0 (19)
Initialization of operation reserve reduction R_OR_R = 0 (20)

Next, the electronic control unit selecting unit 114d-1 determines whether or not the reserve capacity satisfies the target value by using Expression (21) (Step S916).
Formula for determining whether reserve is sufficient {P_SR_R-R_SR_R> T_SR_R} and {P_OR_R -R_OR-R> T_OR_R} ... (21)
For example, when the condition of equation (21) is satisfied, the electric machine selection unit 114d-1 allows the reserve power to satisfy the target value (secure) even when the generator with the selection priority j is added to the electric machine. Is determined), and when the condition of Expression (21) is not satisfied, it is determined that the reserve power is insufficient (cannot be secured).

When it is determined that the reserve capacity is insufficient, the electronic control unit selecting unit 114d-1 returns the added value of the decrease in the reserve capacity to the original value using the equations (22) and (23) (step S918). ).
Decrease in spinning reserve R_SR_R = R_SR_R-SR_R (j) ... (22)
Reduction in operating reserve R_OR_R = R_OR_R-OR_R (j) ... (23)
Next, the control unit selection unit 114d-1 returns to the process of step S712, and evaluates the generator having the next selection priority.

  Also, in the processing of step S916, when it is determined that the reserve capacity satisfies the target value, the electrical machine selecting unit 114d-1 selects the j-th generator having the selection priority order as the electrical machine (step S920). ). For example, in the process of step S920, if another generator has already been set as the electrical machine, the electrical machine selecting unit 114d-1 adds the selected electrical machine to that electrical machine. You. Thus, the processing of this flowchart ends. The control table setting unit 114e-1 creates a control table by repeatedly performing the above-described processing of the electrical machine selecting unit 114d-1 in the processing flow illustrated in FIG.

  According to the first embodiment described above, in the electric power system stabilization system, since the selection of the electric power control unit is performed so that the reserve capacity after the electric power execution is not insufficient, the frequency resulting from the control of the electric power system stabilization system is selected. Can be suppressed, and the reliability of power supply in the power system can be improved. Therefore, more appropriate stabilization control can be performed for a system failure of the power system.

(Second Embodiment)
Next, a power system stabilizing system 10 according to a second embodiment will be described. In the following description, portions having the same functions as those described in the first embodiment will be given the same names and reference numerals, and specific descriptions of the functions will be omitted.

  FIG. 11 is a configuration diagram of a power system stabilization system 10 according to the second embodiment. The power system stabilization system 10 is different from the power system stabilization system 10 of the first embodiment in that an alarm output unit 116 is added to the central processing unit 110-2 and the setting processing unit 114-1 The setting processing unit 114-2 is provided with an electronic control unit 114d-2 instead of the electronic control unit 114d-1. Therefore, the following mainly describes the electrical control selecting unit 114d-2 and the alarm output unit 116.

  For example, in the selection of the electrical equipment set in the control table, the electrical equipment selecting unit 114d-2 disconnects at least one of the electrical equipment candidates corresponding to the assumed accident type from the power system E. Later, when it is determined that the predetermined reserve power cannot be secured (the reserve power is insufficient), information relating to the reserve power shortage alarm indicating that fact is output to the alarm output unit 116. The alarm output unit 116 transmits information on the reserve power shortage alarm determined by the electrical control selecting unit 114d-2 as alarm information to the automatic power supply system EMS in a predetermined format. The predetermined format may be, for example, an e-mail notification to a management terminal of the automatic power supply system EMS, display of character information on a screen of the management terminal, or output of voice information from a speaker of the management terminal. . The alarm output unit 116 transmits alarm information to a mobile terminal (for example, a smartphone or a tablet terminal) or the like owned by an operator or an administrator of the automatic power supply system EMS instead of (or in addition to) the management terminal. Is also good. Thereby, the central processing unit 110-2 can quickly provide the alarm information to the operator or the administrator of the automatic power supply system EMS.

  FIG. 12 is a flowchart illustrating an example of a process executed in the central processing unit 110-2 according to the second embodiment. The processing illustrated in FIG. 12 is different from the processing executed in the central processing unit 110-1 of the first embodiment in that processing in steps S930 to S934 is added. Therefore, the following mainly describes the processing of steps S930 to S934.

  After increasing 1 to the initialized variable j of the selection priority (step S912), the variable controller selecting unit 114d-2 has the variable j within the candidate number x of the electrical regulator selected in the process of step S902. It is determined whether or not (step S930). If the variable j is within the number of candidates x, the central processing unit 110-2 performs the processing of steps S914 to S920. When the variable j exceeds the number of candidates x, the alarm output unit 116 outputs an alarm regarding the shortage of the reserve power to the automatic power supply system EMS. Further, the electrical machine selecting unit 114d-2 selects the generator having the first selection priority as the electrical power generator (Step S934). Thus, the processing of this flowchart ends.

  As described above, according to the second embodiment, in addition to achieving the same effects as the first embodiment, when the reserve capacity is insufficient, the selection of the electrical control is performed so as to maintain the transient stability. At the same time, it is possible to promptly notify an operator or a manager of the automatic power supply system EMS of an alarm indicating that the reserve power is insufficient. Therefore, it is possible to urge an operator or an administrator to cope with a shortage of reserve power.

(Third embodiment)
Next, a power system stabilizing system 10 according to a third embodiment will be described. In the following description, portions having the same functions as those described in the second embodiment will be denoted by the same names and reference numerals, and detailed description of the functions will be omitted.

  FIG. 13 is a configuration diagram of a power system stabilization system 10 according to the third embodiment. The power system stabilization system 10 is different from the power system stabilization system 10 of the second embodiment in that the central processing unit 110-3 is replaced with the reserve calculation unit 115-1 of the central processing unit 110-2. A reserve power calculator 115-3 is provided. Therefore, the following mainly describes the reserve force calculation unit 115-3.

  The reserve power calculation unit 115-3 acquires the ratio of the renewable energy power generation to the total power generation amount from the automatic power supply system EMS as renewable energy information at a predetermined timing such as a fixed period. Renewable energy power generation includes, for example, wind power generation and solar power generation whose power generation output changes depending on weather conditions. Further, the reserve power calculation unit 115-3 sets the target value of the reserve power for the entire system by adding the reserve power corresponding to the ratio of the renewable energy power generation to the acquired total power generation amount.

Specifically, the reserve power calculation unit 115-3 obtains the target value [MW] of the reserve power of the entire system using the equations (24) to (27).
Target value of spinning reserve (increase allowance) T_SR_R = ΣPLmax × (S_SR_R + α × K1) (24)
Target value (reduction allowance) of spinning reserve T_SR_L = ΣPLmax × (S_SR_L + α × K2) (25)
Target value of operating reserve (increase allowance) T_OR_R = ΣPLmax × (S_OR_R + α × K3) (26)
Target value of operating reserve (lowering allowance) T_OR_L = ΣPLmax × (S_OR_L + α × K4) (27)
Here, α is, for example, the ratio of renewable energy power generation to the total power generation amount. K1 to K4 are set values for adjusting the degree in consideration of the risk of output fluctuation of renewable energy power generation, for example. The set values K1 to K4 may be set in the central processing unit 110-3 in advance, or may be acquired from the automatic power supply system EMS at a predetermined timing such as a fixed period.

  As described above, according to the third embodiment, in addition to the same effects as the second embodiment, the output of the renewable energy power generation is secured by securing the reserve power according to the amount of the introduced renewable energy power generation. It is possible to suppress the occurrence of the frequency abnormality caused by the fluctuation. For example, in a situation where the introduction amount of renewable energy power generation is increasing, securing reserve power with hydropower generators or thermal power generators is operated by partial load operation etc. with many hydropower and thermal power generators remaining. As a result, power generation costs are increased. For this reason, in a system in which the amount of renewable energy power generation has been increased, it is important to secure the reserve capacity necessary for eliminating the supply-demand imbalance. Therefore, in the third embodiment, the reserve power to be secured after disconnecting the electric control device associated with the assumed accident type from the electric power system E is calculated based on the total power generation of all the generators that supply power to the electric power system. By setting based on the ratio of the renewable energy power generation, it is possible to suppress the abnormal decrease in the frequency after the power control and the occurrence of the frequency abnormality due to the fluctuation of the output and the demand of the renewable energy power generation.

(Fourth embodiment)
Next, a power system stabilizing system according to a fourth embodiment will be described. In the fourth embodiment, description will be made using the same power system stabilization system 10 as the third embodiment. In the fourth embodiment, the setting processing unit 114-2 of the power system stabilization system 10 estimates the maximum sudden change amount of the renewable energy power generation, and selects a control device based on the estimated maximum sudden change amount.

  Specifically, in the fourth embodiment, the reserve power calculation unit 115-3 calculates the current value of the output of the renewable energy power generation as the renewable energy information from the automatic power supply system EMS and the installed capacity of the renewable energy power generation. At a predetermined timing such as a fixed period.

The reserve power calculation unit 115-3 sets the target value of the reserve power for the entire system in consideration of the maximum sudden change in the output of renewable energy power generation. The output of renewable energy power generation may change suddenly based on, for example, weather conditions and the like. The maximum value of the change width (maximum sudden change amount) differs depending on the operation state of the renewable energy power generation, and the change width in the increasing direction can be expressed by the equation (28), and the change width in the decreasing direction is the equation (29). Can be represented.
Renewable energy output change width (increase direction) ΔPRE_R = ΣPREmax-ΣPRE (28)
Renewable energy output change width (declining direction) ΔPRE_L = ΣPRE (29)
Here, ΣPRE indicates the current value [MW] of the output of renewable energy power generation, and ΣPREmax indicates the installed capacity [MW] of renewable energy power generation.

Further, the reserve power calculation unit 115-3 calculates the target value [MW] of the reserve power of the entire system using the equations (30) to (33).
Target value of spinning reserve (raise allowance)
T_SR_R = ΣPLmax × S_SR_R + ΔPRE_R × K1 (30)
Target value of spinning reserve (lower allowance)
T_SR_L = ΣPLmax × S_SR_L + ΔPRE_L × K2 (31)
Operating reserve target value (increase allowance)
T_OR_R = ΣPLmax × S_OR_R + ΔPRE_R × K3 (32)
Target value of operating reserve (lowering allowance)
T_OR_L = ΣPLmax × S_OR_L + ΔPRE_L × K4 (33)
Here, K1 to K4 are set values for adjusting the degree of reflecting the sudden change risk of the output of renewable energy power generation. The set values K1 to K4 may be set in the central processing unit 110-3 in advance, or may be acquired from the automatic power supply system EMS at a predetermined timing such as a fixed period. The setting processing unit 114-2 sets, in the control table, the electric machine selected based on the calculation result of the reserve power described above for each assumed accident type.

  As described above, according to the fourth embodiment, in addition to the same effects as those of the third embodiment, for example, after the electrical equipment associated with the assumed accident type is disconnected from the power system E, it is secured. By setting the reserve power based on the maximum sudden change in the output of the renewable energy power generation that supplies power to the power system E, it is possible to secure the reserve power that can cope with the sudden change in the output of the renewable energy power generation. Therefore, it is possible to suppress occurrence of frequency abnormality caused by output fluctuation of renewable energy power generation. Each of the first to fourth embodiments described above may have a configuration in which some or all of the other embodiments are combined.

  Although several embodiments of the present invention have been described, these embodiments are presented 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 changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Power system, 10 ... Power system stabilization system, 110, 110-1, 110-2, 110-3 ... Central processing unit, 111, 111-1 ... System information collection part, 112, 112-1 ... System model Creation unit, 113, 113-1: condition setting unit, 114, 114-1, 114-2: setting processing unit, 115-1, 115-3: reserve power calculation unit, 116: alarm output unit, 150: central control Apparatus, 151 ... Electricity control determining unit, 200 ... Accident detection unit, 210 ... Accident type detecting unit, 300 ... Control unit, 310 ... Control unit, E ... Power system, N ... Power supply information network, EMS ... Automatic power supply system

Claims (5)

For each assumed accident type assumed in advance, among a plurality of control targets that supply power to the power system, a setting processing unit that creates a control table that sets a control target to be disconnected from the power system,
An accident type detection unit that detects an accident type corresponding to an accident that has occurred in the power system,
The accident type detected by the accident type detection unit is compared with the control table set by the setting processing unit, and the control target associated with the assumed accident type that matches the accident type is extracted from the power system. A control target determining unit that determines the control target to be disconnected,
A control unit that performs control to disconnect the control target determined by the control target determination unit from the power system,
The setting processing unit sets, for each of the assumed accident types, a selection priority for a candidate of a control target to be disconnected from the power system among the plurality of control targets, and sets the power according to the set selection priority. Select a control target that can secure a predetermined reserve after disconnecting from the system,
Power system stabilization system. An alarm output unit that outputs alarm information is further provided.
The setting processing unit, after disconnecting at least one of the plurality of control target candidates from the power system, when it is determined that the predetermined reserve power cannot be secured, an alarm is output to the alarm output unit. Output information,
The power system stabilization system according to claim 1. The setting processing unit is capable of regenerating a reserve power to be secured after disconnecting a control object associated with the assumed accident type from the power system with respect to a total power generation amount of all generators that supply power to the power system. Set based on the percentage of energy generated,
The power system stabilization system according to claim 1. The setting processing unit estimates a reserve capacity to be secured after disconnecting a control target associated with the assumed accident type from the power system, and estimates a maximum sudden change amount of renewable energy power generation that supplies power to the power system. Set based on the estimated maximum sudden change,
The power system stabilization system according to claim 1. Power system stabilization system
For each presumed accident type assumed in advance, among a plurality of control targets for supplying power to the power system, a control table in which a control target to be disconnected from the power system is created,
Detecting an accident type corresponding to the accident that occurred in the power system,
The detected accident type is compared with the set control table, and a control target associated with an assumed accident type that matches the accident type is determined as a control target to be disconnected from the power system,
Perform control to disconnect the determined control target from the power system,
Further, when creating the control table, for each of the assumed accident types, a selection priority is set for the candidate of the control target among the plurality of control targets, and the power system is selected according to the set selection priority. Select a control object that can secure a predetermined reserve after disconnecting from
Power system stabilization method.

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