JP7225072B2 - Grid stabilization system - Google Patents

Description

Embodiments of the present invention relate to grid stabilization systems.

2. Description of the Related Art For stable operation of a power system, a power system stabilization system is known that monitors the operation status of various power facilities and performs necessary power control when a system fault occurs. In preparation for the occurrence of a grid fault, the grid stabilization system repeatedly executes transient stability calculations assuming the occurrence of a fault based on the state of power before the fault occurs, and controls the power (hereinafter referred to as power control) according to the fault. A method of determining a power machine (for example, a generator, a load, etc.) to be targeted for power control (also referred to as , cutoff, or shedding) is performed.

Conventional power generation equipment mainly consisted of thermal power plants and hydraulic power plants. Therefore, if the control is performed according to the calculation result, a proper effect can be obtained. However, in recent years, the application of renewable energy is expanding. Some of these power generation facilities greatly fluctuate in the amount of electric power they output depending on natural conditions. When power generation facilities are designed to handle these variable power sources, it is necessary to devise conventional calculation and power control mechanisms in power system stabilization systems.

In addition, depending on the renewable energy, communication may be performed via a wireless communication network, a general-purpose communication network, or the like, and communication failure is likely to occur in a part of the communication network. In such a communication environment, a certain communication quality cannot be ensured, and if a communication failure occurs, there is a possibility that the communication cannot be blocked even if a control command is transmitted. In this case, the amount of power control becomes insufficient, and it becomes difficult to stabilize the power system.

Japanese Patent No. 3930369

The problem to be solved by the present invention is to provide a system stabilization system that can stabilize the power system in the event of an accident even when the amount of power fluctuates.

A grid stabilization system of an embodiment has a control device and a control terminal. The control device calculates the system fault based on a control table showing a target control amount for each fault type, which is pre-computed before the system fault occurs, and information indicating the fault type of the system fault that occurred. determines a power machine to be subjected to power control, and outputs a control command. The control terminal disconnects the power machine subject to power control from the power system according to the control command received from the control device. The control terminal transmits, as a response to the control command, a control implementation amount, which is the power amount of the power machine at the time when the power control was implemented, to the control device. The control device determines whether or not to perform power control again in the system fault, based on an insufficient control amount determined according to the control execution amount and the target control amount.

The block diagram which shows the example of a structure of the system stabilization system 1 of 1st Embodiment. 4 is a diagram for explaining communication between a central control device 30 and a control terminal 40 according to the first embodiment; FIG. 4 is a diagram for explaining communication between a central control device 30 and a control terminal 40 according to the first embodiment; FIG. 4 is a diagram for explaining communication between a central control device 30 and a control terminal 40 according to the first embodiment; FIG. 4 is a diagram for explaining communication between a central control device 30 and a control terminal 40 according to the first embodiment; FIG. The figure which shows the example of a structure of the control table 22 of 1st Embodiment. The figure which shows the example of a structure of the control performance information 32 of 1st Embodiment. FIG. 5 is a diagram for explaining communication between a central control device 30 and a control terminal 40 according to the second embodiment; FIG. 5 is a diagram for explaining communication between a central control device 30 and a control terminal 40 according to the second embodiment; The figure explaining communication with the central control unit 30 and the control terminal 40 of 3rd Embodiment.

Hereinafter, the system stabilization system of the embodiment will be described with reference to the drawings. In the following description, an example in which the target of power control (electric control) is a generator will be described, but the present invention is not limited to this. The target of shedding may be a load. It should be noted that power control is control that disconnects (disconnects) the generator and the load from the power system when an accident occurs, and is sometimes referred to as "shutoff" below. In addition, generators and loads that can be the target of shedding control are collectively referred to as "power machines." In other words, a generator is an example of a "power machine."

(Configuration of grid stabilization system 1)
First, the configuration of the system stabilization system 1 will be described using FIG.
FIG. 1 is a block diagram showing an example of the configuration of a system stabilization system 1 according to the first embodiment. The grid stabilization system 1 includes, for example, an accident detection terminal 10, a central processing unit 20, a central control unit 30, and a control terminal 40. Here, the central control device 30 is an example of a "control device". The control terminal 40 is an example of a "control terminal".

The electric power system E is a set of a series of equipment for generating electric power and transmitting the generated electric power to the load equipment of the consumer. The electric power system E is composed of electric power equipment (also called system equipment) such as, for example, a generator, a bus, a transformer or a transmission line, a load, a phase modifying equipment, a circuit breaker, and a disconnecting switch. The power system E includes a voltage-measuring transformer and a current-measuring transformer for measuring the power supplied to the power equipment.

The power supply information network N is a communication network that communicably connects each of the power facilities that make up the power system E and the central processing unit 20 . System information acquired in each of the power facilities is output to the central processing unit 20 via the power supply information network N. The grid information is information about the connection state of power equipment in the power grid E and the power supply and demand state. The system information includes, for example, switching states of circuit breakers and disconnecting switches, generator output, load, active and reactive power of transmission lines, and information on bus voltage of each electric station.

The accident detection terminal 10, the central processing unit 20, the central control unit 30, and the control terminal 40 are implemented by a hardware processor such as a CPU (Central Processing Unit) executing a program (software). Some or all of these components are hardware (circuit part; circuitry) or by cooperation of software and hardware. The program may be stored in advance in a storage device (a storage device with a non-transitory storage medium) such as a HDD (Hard Disk Drive) or flash memory, or may be stored in a removable storage such as a DVD or CD-ROM. It may be stored in a medium (non-transitory storage medium) and installed by loading the storage medium into a drive device.

The accident detection terminal 10 is connected to the power system E. The accident detection terminal 10 is installed in power facilities that need to detect accidents in the power system E, such as substations, switching stations, and power plants. The accident detection terminal 10 acquires time-series information of electric power in power equipment to be detected, and detects whether or not a system fault has occurred in the detection target. When detecting a grid fault, the fault detection terminal 10 determines the fault type. When the accident detection terminal 10 detects the occurrence of a system accident, the accident detection terminal 10 transmits the determined accident type to the central control device 30 .

The accident type is information for identifying the type of system fault, and is, for example, information indicating an accident number, accident response location, and accident aspect. A system fault is a general term for faults such as ground faults that occur in the power system E. The fault response point is a point where a system fault has occurred. The accident mode is the specific content of the system fault indicated by a code that combines symbols and numbers.

The central processing unit 20 is connected to the power system E via the power supply information network N. The central processing unit 20 acquires the system information of each power equipment via the power supply information network N (online) at a constant cycle or at an update cycle for each system information.

The central processing unit 20 includes, for example, a pre-computation unit 21 and a control table 22 . The pre-computation unit 21 creates a system model. The grid model is a model equivalent to the state of the power grid E at the time the grid information is detected. Specifically, the pre-computing unit 21 creates a system model using system information and pre-stored system equipment information. The system equipment information is the specification of the power equipment that constitutes the power system E, and is information such as the impedance of the generator, for example.

The pre-computing unit 21 performs a power flow calculation using system information on the created system model to calculate a power flow (power) value flowing through the system. Based on the calculated power flow value, the pre-computing unit 21 performs a transient stability computation simulation of the behavior of the system after the generator to be interrupted for accident occurrence, accident removal, and shedding control. The pre-calculation unit 21 repeatedly performs transient stability calculations while changing the generator to be shedding-controlled until a stable system is obtained. The pre-computing unit 21 selects a combination of generators to be shemmed based on the result of the analysis simulation that stabilizes the system, and creates a control table 22 for each assumed accident.

The control table 22 is information that associates a target value (target control amount MP) of the amount of electric power to be disconnected from the system when an accident occurs and a combination of generators to be cut off for each assumed system accident (assumed accident) ( See Figure 6).

The central processing unit 20 periodically updates the control table 22 by periodically executing the analysis simulation by the pre-computing unit 21 . As a result, the latest system information is always reflected, and the power system E can be stabilized when a system fault occurs.

The central control unit 30 is communicably connected to the accident detection terminal 10, the central processing unit 20, and the control terminal 40. FIG. The central controller 30 acquires the accident type from the accident detection terminal 10 . The central controller 30 acquires the control table 22 from the central processing unit 20 .

The central control device 30 includes, for example, an electric control machine determination unit 31 and control performance information 32 . The shedding machine determination unit 31 refers to the control table based on the accident type, and obtains a target control amount and a combination of generators to be shemmed corresponding to the system fault indicated by the accident type. The shedding machine determination unit 31 determines a generator to be actually shedding control based on the acquired target control amount and the combination of generators to be shedding target, and corresponds to the determined shedding machine. A control command is output to the control terminal 40 . The control command is a command to command the control terminal 40 to cut off the circuit breaker managed by the control terminal 40 . The circuit breaker managed by the control terminal 40 is a circuit breaker provided between the power generator and the power system E, and the power generator is separated from the power system E by breaking the breaker. be

The shedding machine determination unit 31 creates control performance information 32 based on the shedding performance. The control performance information 32 is information indicating the performance of shedding. Presence or absence of a response (Ack), etc. (see FIG. 7).

Note that the control table 22 is information stored in a storage unit (not shown) of the central processing unit 20, and the control result information 32 is information stored in a storage unit (not shown) of the central control unit 30, for example. These storage units are configured by, for example, HDD, flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), ROM (Read Only Memory), or RAM (Random Access Memory).

The control terminal 40 outputs a break command to the circuit breaker managed by the control terminal 40 according to the control command from the central control device 30 . A break command is a command to break the circuit breaker. When the control terminal 40 cuts off the circuit breaker, it returns a response (Ack) to that effect to the central control unit 30 .
The above is the configuration of the system stabilization system 1 .

Here, in the embodiment, it is assumed that the power generator to be power-controlled is a power generator whose output power can vary greatly over time (for example, a power generator using renewable energy). Therefore, there may be a difference between the output of the generator assumed in the pre-online calculation and the output of the generator when the shedding is actually performed. If a difference occurs and the amount of electric power cut off from the electric power system E by electrical control becomes insufficient, the electric power system E may not be stabilized.

As a countermeasure, in each embodiment described below, communication between the central control unit 30 and the control terminal 40 is used to stabilize the power system E even when the amount of power cut off from the power system E is insufficient. to be able to

(First embodiment)
A first embodiment will be described. 2 to 5 are diagrams for explaining communication between the central control unit 30 and the control terminal 40 of the first embodiment. FIG. 2 shows pre-fault communications in which no grid fault has occurred. 3 to 5 show communications during a system fault.

As shown in FIG. 2, before an accident, the control terminal 40 notifies the central control unit 30 of the output power amount HP (referred to as power amount in FIG. 2). The output power amount HP here is the power amount output from the generator connected to the power system E via the circuit breaker managed by the control terminal 40 . In other words, it is the amount of electric power output from a generator that can be the target of shedding control. The control terminal 40 acquires the voltage and current output by the generator from, for example, a voltage-measuring transformer and a current-measuring transformer connected between the generator and the circuit breaker. The control terminal 40 calculates the output power amount HP based on the acquired voltage and current, and notifies the central control unit 30 of the calculated output power amount HP.

In this example, each of a plurality of control terminals 40 (control terminals 40-1, . . . , 40-K, 40-K+1, 40-K+2, . A case of notifying the control device 30 of the output power amount HP is shown.

The period at which the control terminal 40 notifies the central control unit 30 of the output power amount HP may be set arbitrarily, but the period is shorter than the period at which the central processing unit 20 acquires system information via the power supply information network N. Preferably. This makes it possible to grasp the difference between the output of the generator assumed in advance online calculation and the output of the generator when shedding is actually performed. If it is possible to grasp the difference, it is possible to determine whether or not to implement power control again.

As shown in FIG. 3, the central control unit 30 outputs a control command to the control terminal 40 in the event of an accident. When the control terminal 40 acquires the control command from the central control device 30, the control terminal 40 notifies the control execution amount JP to the central control device 30 as a response. The control execution amount JP is the amount of electric power measured when power control is performed. That is, the control execution amount JP is the amount of electric power actually disconnected from the power system E during shedding. The central control unit 30 stores the control performance amount JP acquired from the control terminal 40 as the control performance information 32 .

This example shows a case where the central control unit 30 outputs a control command to each of the control terminals 40-1, . .

As shown in FIG. 4, in the event of an accident, a control command output by the central control unit 30 may not be transmitted to the control terminal 40 due to communication failure or the like. In this case, the control execution amount JP is not notified from the control terminal 40 that could not acquire the control command. When the central control unit 30 cannot acquire the control execution amount JP from the control terminal 40, the central control unit 30 stores that fact as the control performance information 32. FIG.

In this example, the central control unit 30 outputs a control command to each of the control terminals 40-1, . The control terminal 40-K+1 does not notify the execution amount JP (no response) although the execution amount JP is notified.

As shown in FIG. 5, the central controller 30 performs power control again as necessary. The second shedding is shedding that is performed when the amount of power to be cut off from the power system E is still insufficient even after shedding that has been performed according to the control table 22 .

Specifically, the central control unit 30 detects the system accident based on the insufficient control amount FP determined according to the control amount JP notified from the control terminal 40 and the target control amount MP stored in the control table 22. , it is determined whether or not to perform shedding (power control) again. The insufficient control amount FP is expressed, for example, by the following equation (1).

FP=MP-Σ(JP) …(1)

In the equation (1), FP is the insufficient control amount, MP is the target control amount, and JP is the control amount, and Σ(JP) is the control amount JP shows the sum of

Here, when the central control unit 30 derives the insufficient control amount FP, only the generators for which a response (control execution amount JP) has been notified from the control terminal 40 are targeted. That is, as in the example of FIG. 3, when there is a response from all of the control terminals 40 that output the control command, the central control unit 30 receives the control notified from each of the control terminals 40 that output the control command. By substituting the implementation amount JP into the second term on the right side of the equation (1), the insufficient control amount FP is calculated. On the other hand, as shown in FIG. 4, when there is no response from control terminal 40-k+1 among the control terminals 40 that output the control command, the central controller 30 responds Insufficient control amount FP is calculated by substituting the control execution amount JP of the control terminal 40 (control terminals 40-1, .

The central control unit 30 determines to perform shedding again, for example, when the insufficient control amount FP is positive (plus). When the central control unit 30 determines to perform power control again, it selects a generator to perform power control again. Among a plurality of control terminals 40 to be controlled by the central controller 30 (control terminals 40-1, . . . , 40-K, 40-K+1, 40-K+2, . , generators other than generators that have been shedding (controlled) are subject to shedding again (controlled).

The central control unit 30 selects a generator whose output electric energy HP is greater than the insufficient control amount FP as a generator to be power-controlled again. That is, the central control unit 30 selects a generator that satisfies the following expression (2) as a generator to be power-supplied again.

FP<HP (2)

Here, FP indicates the amount of insufficient control, and HP indicates the output power amount of the generator. The output power amount HP is the power amount periodically notified from each control terminal 40 before an accident.

When there are a plurality of generators that satisfy the expression (2), the central controller 30 re-controls the generator whose output power HP is closest to the insufficient control amount FP among the plurality of generators. may be selected as

Alternatively, if there is no generator that satisfies the formula (2), the central controller 30 determines that the sum of the output power amounts HP of the plurality of generators satisfies the formula (2) and the sum of the output power amounts HP is insufficient. A combination having a value closest to the control amount FP may be derived, and the generator of the derived combination may be selected as the generator to perform shedding control again.

Note that even if there is a generator that satisfies the formula (2), the central controller 30 determines that the sum of the output power amounts HP of the plurality of generators satisfies the formula (2) and the output power amount Of course, it is also possible to derive a combination in which the sum of HP is closest to the insufficient control amount FP, and select the generator of the derived combination as the generator to perform shedding control again.

As mentioned above, the output of the generator can fluctuate. Therefore, the central control unit 30 may select a generator whose output power amount HP is larger than the power amount obtained by adding a margin to the insufficient control amount FP as the power generator to perform power control again. . That is, the central control unit 30 may select, for example, a generator that satisfies the following expression (3) as a generator to perform power control again.

FP×k<HP (3)

Here, FP is an insufficient control amount, k is an arbitrary real number equal to or greater than 1, and HP is the power output of the generator.

In the example of FIG. 5, when the central control unit 30 outputs a control command to the control terminal 40-N to instruct the control terminal 40-N to perform shedding again, and in response thereto, the control terminal 40-N notifies the control execution amount JP. is shown.

The central control unit 30 may repeat shedding again until the value of the insufficient control amount FP becomes negative (minus). The central control unit 30 causes the control performance information 32 to store the amount of control JP acquired from the control terminal 40 corresponding to the power generator that has been electrically controlled again.

FIG. 6 is a diagram showing an example of the configuration of the control table 22 according to the first embodiment. As shown in FIG. 6, the control table 22 includes items such as an assumed accident type number, a target controlled variable (target controlled variable MP), and a controlled object. The assumed accident type number indicates the number corresponding to the accident type of the assumed accident targeted in the online precomputation. The target control amount indicates the target value of the amount of electric power that needs to be cut off from the power system E in order to stabilize the assumed accident calculated by the online preliminary calculation. The control target indicates the identification number of the generator selected as the target of shedding control for the assumed accident. In this example, the target control amount for assumed accident type number (1) is P1, and the control targets are generators G1 and G3.

FIG. 7 is a diagram showing an example of the configuration of the control performance information 32 according to the first embodiment. As shown in FIG. 7, the control performance information 32 includes items such as, for example, an implementation accident type number, target control amount, electric control terminal, response, and control implementation amount. The implemented accident type number indicates the number corresponding to the accident type of the system accident that actually occurred. The target control amount indicates the target control amount (target control amount MP) corresponding to the accident type stored in the control table 22 . The electrical control terminal indicates the identification number of the generator connected to the control terminal 40 to which the central control unit 30 has output the control command. Response indicates whether or not there is a response to the control command. The control implementation amount indicates the control implementation amount JP notified from the control terminal 40 . In this example, the target control amount for the executed accident type number (1) is P1, there is a response to the control command for the generator G1, the control execution amount is PG1 (t), and It indicates that there was a response to the control command and that the control implementation amount was PG3(t).

As described above, the system stabilization system 1 of the first embodiment includes the central control device 30 (an example of a "control device") and the control terminal 40 (an example of a "control terminal"). Based on the control table 22 showing the target controlled variable MP for each accident type, which was calculated in advance before the system accident occurred, and the information indicating the accident type of the system accident that occurred, the central controller 30: A generator (an example of a "power machine") to be subject to power control in the relevant system fault is determined, and a control command is output. The control terminal 40 disconnects the power generator subject to power control from the power system E according to the control command received from the central controller 30 . As a response to the control command, the control terminal 40 transmits to the central control device 30 the amount of control JP at the time when the power control was performed. The control terminal 40 determines whether or not to perform power control again in the event of a system fault, based on the insufficient control amount FP determined according to the control amount JP and the target control amount MP. As a result, in the power system stabilization system 1 of the first embodiment, it is possible to derive the insufficient control amount FP using the control execution amount JP, and when the insufficient control amount FP occurs, the shedding is performed again. can be determined to be implemented. Therefore, even if the control amount is insufficient due to fluctuations in the amount of electric power and the amount of electric power generated by the generator being less than assumed at the time of pre-online calculation, it is possible to determine to perform shedding again. can. Therefore, it is possible to stabilize the electric power system E even when the power amount of the generator fluctuates.

In addition, in the system stabilization system 1 of the first embodiment, the control terminal 40 notifies the central control device 30 of the output power amount HP of the power machine before the system fault occurs. The insufficient control amount FP is the difference between the control amount JP and the target control amount MP. When the output power amount HP of the power generator received before the occurrence of the system fault is larger than the insufficient control amount FP, the central control unit 30 may make the power generator subject to power control again. As a result, it is possible to select whether or not to perform shedding again, and to select the generator for which shedding is to be performed again, by a simple method of calculating the difference.

In addition, in the system stabilization system 1 of the first embodiment, the control terminal 40 notifies the central control device 30 of the output power amount HP of the power machine before the system fault occurs. The insufficient control amount FP is a value obtained by multiplying the difference between the control amount JP and the target control amount MP by a predetermined margin k. When the output power amount HP of the power machine received before the occurrence of the grid fault is larger than the insufficient control amount FP (the value added with the margin), the central control unit 30 makes the power machine subject to power control. can be As a result, it is possible to select the generator for which the power cut is to be performed again, taking into consideration the case where the amount of electric power notified from the control terminal 40 fluctuates and slightly decreases by the time the power cut is to be performed again. is.

(Second embodiment)
Next, a second embodiment will be described. In the following description, only configurations that are different from the above-described embodiment will be described, and similar configurations will be denoted by the same reference numerals, and descriptions thereof will be omitted.
8 and 9 are diagrams for explaining communication between the central control unit 30 and the control terminal 40 according to the second embodiment. FIG. 8 shows the state before the accident, and FIG. 9 shows the state after the accident.

As shown in FIG. 8, before an accident, the control terminal 40 notifies the central control unit 30 of the output power HP and the control availability information SK. The control propriety information SK is information indicating whether or not power control can be implemented. For example, if the circuit breaker has already been cut off, the control terminal 40 notifies the central control unit 30 of control availability information SK indicating that shedding cannot be performed. Alternatively, the control terminal 40 notifies the central control unit 30 of control availability information SK indicating that shedding cannot be performed when the power generator is not generating power.

In this example, among the plurality of control terminals 40 (control terminals 40-1, ..., 40-K, 40-K+1, 40-K+2, ..., 40-N) to be controlled by the central control unit 30, Control terminal 40-1, . It shows a case where information SK is notified.

As shown in FIG. 9, in the event of an accident, the central control unit 30 outputs a control command to the control terminal 40 to which the control availability information SK indicating that shedding is possible is notified.

Specifically, the shedding machine determination unit 31 of the central controller 30 refers to the control table based on the accident type, and determines the target control amount MP and the shedding target corresponding to the system fault indicated by the accident type. Acquire the combination of generators with The shedding machine determination unit 31 excludes the generators for which the control availability information SK indicating that shedding cannot be performed is notified from among the acquired combinations of generators.

The shedding machine determination unit 31 selects a new shedding target generator instead of the excluded generator. For example, the shedding machine determining unit 31 extracts generators notified of an output power amount HP greater than the reference power amount OP (the power amount used in the online pre-computation) of the excluded generator. The shedding machine determination unit 31 takes the extracted generator as a new generator to be shedding control.

If there are a plurality of generators with an output power amount HP greater than the reference power amount OP, the central control unit 30 selects the generator whose output power amount HP is closest to the reference power amount OP. may be selected as a new power generator to be the shedding target.

Alternatively, if there is no generator with an output power amount HP greater than the reference power amount OP, the central controller 30 determines that the sum of the output power amounts HP of the plurality of power generators is greater than the reference power amount OP, and the output power A combination in which the sum of the amounts HP is the closest to the reference power amount OP may be derived, and the derived combination generator may be selected as a new generator to be shedding control.

Note that even if there is a generator having an output power amount HP greater than the reference power amount OP, the central controller 30 determines that the sum of the output power amounts HP of the plurality of power generators is greater than the reference power amount OP. Also, a combination in which the total sum of the output power amounts HP is the closest value to the reference power amount OP may be derived, and the generator of the derived combination may be selected as the power generator to perform shedding control again. Of course.

In this example, the central control unit 30 outputs a control command to each of the control terminals 40-1, . Further, the central control unit 30 does not output a control command to 40-K+1 to which the control permission/prohibition information SK indicating that shedding cannot be performed is notified. Instead, the central control unit 30 is outputting a control command to the control terminal 40-N to which the control permission/prohibition information SK indicating that power control is possible is sent.

As described above, the system stabilization system 1 of the second embodiment includes the central control device 30 (an example of a "control device") and the control terminal 40 (an example of a "control terminal"). Based on the control table 22 showing the target controlled variable MP for each accident type, which was calculated in advance before the system accident occurred, and the information indicating the accident type of the system accident that occurred, the central controller 30: A generator (an example of a "power machine") to be subject to power control in the relevant system fault is determined, and a control command is output. The control terminal 40 disconnects the power generator subject to power control from the power system E according to the control command received from the central controller 30 . The control terminal 40 notifies the central control unit 30 of control availability information SK indicating whether power control of the power machine can be performed before an accident (before a system accident occurs). The central control unit 30 determines the power machine to be subjected to power control in the relevant system fault based on the control availability information SK. As a result, the grid stabilization system 1 of the second embodiment excludes generators that cannot be shedding based on the control availability information SK, and replaces the excluded generators based on the amount of electric power. A new generator can be selected for Therefore, the same effects as those described above can be obtained.

(Third embodiment)
Next, a third embodiment will be described. In the following description, only configurations that are different from the above-described embodiment will be described, and similar configurations will be denoted by the same reference numerals, and descriptions thereof will be omitted. In this embodiment, before an accident, the control terminal 40 notifies the central control device 30 of the amount of electric power, as in the first embodiment.

FIG. 10 is a diagram explaining communication between the central control unit 30 and the control terminal 40 according to the third embodiment. FIG. 10 shows the state at the time of the accident.
As shown in FIG. 10, in the event of an accident, the central control unit 30 outputs a control command to the control terminal 40 to be power-suppressed. When the control terminal 40 acquires the control command from the central control device 30, the control terminal 40 notifies the response (Ack). The response here may or may not include the control implementation amount JP. The central control unit 30 waits for a response from the control terminal 40 during a standby time from when the control command is output until a predetermined time elapses. If there is a control terminal 40 for which no response is received during the standby time, the central control unit 30 determines that the control terminal 40 did not shut down, and that power control is to be performed again. The method by which the central control unit 30 performs power control again is the same as in the above-described first embodiment, so description thereof will be omitted.

As described above, the system stabilization system 1 of the third embodiment includes the central control device 30 (an example of a "control device") and the control terminal 40 (an example of a "control terminal"). Based on the control table 22 showing the target controlled variable MP for each accident type, which was calculated in advance before the system accident occurred, and the information indicating the accident type of the system accident that occurred, the central controller 30: A generator (an example of a "power machine") to be subject to power control in the relevant system fault is determined, and a control command is output. The control terminal 40 notifies the control device of a response to the control command. If the central control unit 30 does not receive a response from the control terminal 40 within a predetermined period of time after outputting the control command, it determines that power control will be performed again in the event of the system fault. Thereby, there exists an effect similar to the effect mentioned above. Further, it is possible to quickly determine whether or not to perform power control again within a predetermined period of time after outputting the control command.

According to at least one embodiment described above, in the system stabilization system 1, the control terminal 40 transmits the control execution amount JP to the central controller 30 as a response to the control command, and the central controller 30 controls the control execution Based on the insufficient control amount determined according to the amount JP and the target control amount MP, it is determined whether or not to perform the power control again in the system fault. As a result, the power system can be stabilized when an accident occurs, even if the amount of power fluctuates.

While several embodiments of the invention have been described, these embodiments have been 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 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.

DESCRIPTION OF SYMBOLS 1... Grid stabilization system, 10... Accident detection terminal, 20... Central processing unit, 21... Pre-computation part, 22... Control table, 30... Central control unit (control apparatus), 31... Electric control machine determination part, 32... control performance information, 40... control terminal (control terminal)

Claims (5)

Based on the control table showing the target control amount for each fault type calculated in advance before the occurrence of the system fault and the information indicating the fault type of the fault that occurred, the power control target for the fault is determined. A control device that determines a power machine to be used and outputs a control command;
a control terminal for disconnecting a power machine subject to power control from a power system according to the control command received from the control device;
In a grid stabilization system comprising
The control terminal transmits to the control device, as a response to the control command, a control execution amount that is the amount of power of the power machine at the time the power control is executed,
The control device determines whether or not to perform power control again in the system fault, based on an insufficient control amount determined according to the control execution amount and the target control amount.
Grid stabilization system. The control terminal notifies the control device of the power amount of the power machine before the occurrence of a grid fault,
The insufficient control amount is the difference between the control implementation amount and the target control amount,
When the power amount of the power machine received before the occurrence of the grid fault is greater than the insufficient control amount, the control device subjects the power machine to power control again.
The grid stabilization system according to claim 1. The control terminal notifies the control device of the power amount of the power machine before the occurrence of a grid fault,
The insufficient control amount is a value obtained by multiplying the difference between the control execution amount and the target control amount by a predetermined margin,
When the power amount of the power machine received before the occurrence of the grid fault is greater than the insufficient control amount, the control device treats the power machine as the target of power control.
The grid stabilization system according to claim 1. Based on the control table showing the target control amount for each fault type calculated in advance before the occurrence of the system fault and the information indicating the fault type of the fault that occurred, the power control target for the fault is determined. A control device that determines a power machine to be used and outputs a control command;
A system stabilization system comprising a control terminal that disconnects a power machine subject to power control from a power system in accordance with the control command received from the control device,
The control terminal notifies the control device of the power amount of the power machine and control availability information SK indicating whether or not power control of the power machine can be performed before the occurrence of the grid fault,
The control device determines a power machine to be subjected to power control in the system fault based on the power amount and the control availability information SK.
Grid stabilization system. Based on the control table showing the target control amount for each fault type calculated in advance before the occurrence of the system fault and the information indicating the fault type of the fault that occurred, the power control target for the fault is determined. A control device that determines a power machine to be used and outputs a control command;
A system stabilization system comprising a control terminal that disconnects a power machine subject to power control from a power system in accordance with the control command received from the control device,
The control terminal notifies the control device of a response to the control command,
If the control device does not receive a response from the control device within a predetermined time after outputting the control command, the control device determines to perform power control again in the system fault.
Grid stabilization system.

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