JP7098515B2 - Power system stabilizer - Google Patents

Description

The present embodiment relates to a power system stabilizing device that controls the output amount of the renewable energy power generation device and secures the stability of the power system in the power system including the synchronous machine and the renewable energy power generation device.

A power system stabilizer that controls the output amount of a power generation device in the power system based on the collected power system information is known in order to prevent the generator from stepping out in the event of an accident.

JP-A-2015-130777 Japanese Unexamined Patent Publication No. 2016-208826

In recent years, the introduction of renewable energy power generation devices such as solar power generation has been progressing. A large number of renewable energy generators are connected to the power system. For this reason, the number of operating synchronous machines such as thermal power and hydraulic power connected to the electric power system tends to be smaller than before.

Conventionally, when an accident occurs in the power system, the synchronization stability of the system is ensured by limiting the power supply (electric control) of the synchronous machine.

However, in a power system in which a large number of renewable energy power generation devices are connected and the number of synchronous machines in operation is small, if the synchronous machine is controlled in the event of an accident or the like, the power system may become unstable. This is because the ratio of synchronous machines to the entire power system is further reduced, the voltage maintenance source is reduced, and the inertia and synchronization power are also reduced.

Therefore, in a power system in which the number of synchronous machines in operation is small, it is desirable to reduce or stop the output amount of the renewable energy power generation device instead of the synchronous machine to secure a certain number of parallel machines in parallel.

On the other hand, there is a problem that the stability of the power system cannot be ensured if the renewable energy power generation device is randomly selected and controlled to reduce or stop the output amount. It is necessary to select a renewable energy power generation device that has a high grid stabilizing effect by reducing or stopping the output amount, and perform control to reduce the output amount.

If control is performed to reduce or stop the output amount of the renewable energy power generation device, there is also a problem that a loss occurs to the power generation company that owns the controlled renewable energy power generation device. Alternatively, the power transmission and distribution business operator may have to compensate for the loss incurred by the power generation business operator. Therefore, it is desirable to minimize the decrease or stop of the output amount of the renewable energy power generation device to be controlled.

In view of the above problems, the present embodiment selects a renewable energy power generation device that reduces or stops the output amount, and provides a power system stabilizing device that can efficiently secure the stability of the power system. The purpose.

The power system stabilizing device of the present embodiment is characterized by having the following configuration.
(1) A stability calculation unit that calculates the stability of a possible target accident case in an electric power system including a synchronous machine and a renewable energy power generation device.
(2) An acceleration tendency synchronous machine extraction unit that extracts one or more acceleration tendency synchronous machines when the stability calculated by the stability calculation unit is determined to be unstable.
(3) Extracted by the acceleration tendency synchronous machine extraction unit when the output amount of the renewable energy power generation device is reduced by the first reduction amount when an accident related to the assumed target accident case occurs. A sensitivity calculation unit that calculates the deceleration sensitivity of the synchronous machine with the acceleration tendency.
(4) The renewable energy power generation device is extracted based on the deceleration sensitivity calculated by the sensitivity calculation unit, and the extracted renewable energy whose stability calculated by the stability calculation unit is judged to be stable. Renewable energy reduction amount addition part that determines the total reduction amount of the output amount of the power generation device.
(5) Based on the total reduction amount determined by the renewable energy reduction amount addition unit, the reduction target for determining the renewable energy power generation device that reduces the output amount when an accident related to the assumed target accident case occurs. Decision department.
(6) The renewable energy reduction amount addition unit extracts the renewable energy power generation device in descending order of the deceleration sensitivity calculated by the sensitivity calculation unit, and the stability calculated by the stability calculation unit is stable. Until it is determined, the output amount of the extracted renewable energy power generation device is sequentially reduced by the second reduction amount to determine the total reduction amount.

Overall view showing the configuration of the system using the power system stabilizer according to the first embodiment. A block diagram showing the configuration of the arithmetic unit of the power system stabilizing device according to the first embodiment. The figure which shows the flow of the program of the arithmetic part of the power system stabilization apparatus which concerns on 1st Embodiment. The figure explaining the operation at the time of making a system model of the power system stabilizer which concerns on 1st Embodiment. The figure explaining the selection of the renewable energy power generation apparatus by the electric power system stabilizer which concerns on 1st Embodiment.

[1. First Embodiment]
[1-1. overall structure]
FIG. 1 is an overall view showing a configuration of a system using the power system stabilizing device 1 according to the first embodiment. In the present embodiment, when there are a plurality of devices and members having the same configuration, they will be described with the same number, and when each of the devices and members having the same configuration will be described, a common number will be given. It is distinguished by adding a hyphen to the.

In FIG. 1, the synchronous machine 4-1 is connected to the power system 9 via a transformer 3-1, a circuit breaker 5-1 and a transmission line 2-2 and a transmission line 2-1. Similarly, the synchronizer 4-2 is connected to the power system 9 via a transformer 3-2, a breaker 5-2, a transmission line 2-2, and a transmission line 2-1. The synchronizer 4-3 is a transformer. It is connected to the power system 9 via 3-3, a breaker 5-3, a transmission line 2-2, and a transmission line 2-1.

The synchronous machines 4-1, 4-2, and 4-3 are composed of power generation devices such as thermal power and hydraulic power. The transformers 3-1, 3-2, and 3-3 convert the voltage of the electric power output from the synchronous machines 4-1, 4-2, and 4-3, respectively, into a predetermined voltage.

The circuit breakers 5-1, 5-2, and 5-3 are composed of switches that cut off the electric power, and cut off the electric power output from the synchronous machines 4-1, 4-2, and 4-3, respectively. The circuit breakers 5-1, 5-2, and 5-3 are connected to the power system stabilizing device 1 by a communication line, and the opening and closing are controlled by the power system stabilizing device 1.

The renewable energy power generation device 6-1 is connected to the power system 9 via a transformer 3-4, and the renewable energy power generation device 6-2 is powered via a transformer 3-5 and a transmission line 2-1. It is connected to the system 9. The transformers 3-4 and 3-5 convert the voltage of the electric power output from the renewable energy power generation devices 6-1 and 6-2, respectively, into a predetermined voltage.

The renewable energy power generation devices 6-1 and 6-2 are connected to the power system stabilizing device 1 by a communication line, and the output amount is controlled by the power system stabilizing device 1.

The accident detection device 7-1 is installed on the transmission line 2-1 and the accident detection device 7-2 is installed on the transmission line 2-2. The accident detection devices 7-1 and 7-2 are composed of a ground fault detection device, an abnormal voltage / current detection device, and the like. The accident detection devices 7-1 and 7-2 are connected to the power system stabilizing device 1 by a communication line, and transmit accident information to the power system stabilizing device 1.

Information collecting devices 8-6 and 8-7 are installed on the transmission line 2-1 and information collecting devices 8-8 and 8-9 are installed on the transmission line 2-2. The information collecting device 8-1 is installed in the synchronous machine 4-1, the information collecting device 8-2 is installed in the synchronous machine 4-2, and the information collecting device 8-3 is installed in the synchronous machine 4-3. An information collecting device 8-4 is installed in the renewable energy power generation device 6-1 and an information collecting device 8-5 is installed in the renewable energy power generation device 6-2.

The information collecting devices 8-1 to 8-9 are composed of measuring devices that detect the frequency, phase, voltage, current, active power, and reactive power of electric power. The information collecting devices 8-1 to 8-9 are connected to the power system stabilizing device 1 by a communication line. The information collecting devices 8-1 to 8-9 detect the frequency, phase, voltage, current, active power, and inactive power of the power, and transmit the power information to the power system stabilizing device 1.

[1-2. Configuration of power system stabilizer 1]
The power system stabilizing device 1 is a control device that determines a reduction amount of output and a renewable energy power generation device that reduces the output amount at the time of an accident. The power system stabilizing device 1 has a calculation unit 10 and a control unit 20. The arithmetic unit 10 and the control unit 20 are each configured by a computer and are connected inside the power system stabilizing device 1. Alternatively, the arithmetic unit 10 and the control unit 20 are integrally configured by a computer. The power system stabilizing device 1 is installed in a command room such as a power supply command center, a system control center, or a centralized control center that monitors and controls the power system.

(A, configuration of control unit 20)
The control unit 20 is composed of a computer and is connected to the arithmetic unit 10 inside the power system stabilizing device 1. The control unit 20 transmits a command to open / close the circuit breaker to the circuit breakers 5-1, 5-2, 5-3 connected via the communication line based on the instruction of the calculation unit 10. Based on the instruction of the calculation unit 10, the control unit 20 transmits a command to increase or decrease the output amount to the renewable energy power generation devices 6-1 and 6-2 connected via the communication line.

When the control unit 20 receives the accident information from the accident detection devices 7-1 and 7-2 connected via the communication line and determines that an accident has occurred, the amount of decrease in the output determined by the calculation unit 10 is determined. And, based on the renewable energy power generation device that is the target of the decrease in the output amount, a command to increase or decrease the output amount is transmitted to the renewable energy power generation devices 6-1 and 6-2.

(B, configuration of arithmetic unit 10)
The arithmetic unit 10 is composed of a computer and is connected to the control unit 20 inside the power system stabilizing device 1. The arithmetic unit 10 receives the power information from the information collecting devices 8-1 to 8-9 connected via the communication line, and reduces the output amount in the event of an accident, and the renewable energy power generation device 6 and the output reduction. Determine the amount. The calculation unit 10 performs a calculation according to the flowchart shown in FIG.

The calculation unit 10 includes a stability calculation unit 11 composed of a calculation unit in a computer or a software module, an acceleration tendency synchronous machine extraction unit 12, a sensitivity calculation unit 13, a regeneration energy reduction amount addition unit 14, and a reduction target determination unit 15. Have.

(Stability calculation unit 11)
The stability calculation unit 11 calculates the stability of the assumed target accident case in the power system including the synchronous machine 4 and the renewable energy power generation device 6.

(Acceleration trend synchronous machine extraction unit 12)
The acceleration tendency synchronous machine extraction unit 12 extracts one or more acceleration tendency synchronous machines 4 when the stability calculated by the stability calculation unit 11 is determined to be unstable.

(Sensitivity calculation unit 13)
The sensitivity calculation unit 13 is extracted by the acceleration tendency synchronizer extraction unit 12 when the output amount of the renewable energy power generation device 6 is reduced by the reduction amount P1 when an accident related to a assumed target accident case occurs. The deceleration sensitivity of the synchronous machine 4 having an acceleration tendency is calculated. The reduction amount P1 corresponds to the first reduction amount in the claims.

(Re-energy reduction amount additional part 14)
The renewable energy reduction amount addition unit 14 extracts the renewable energy power generation device 6 based on the deceleration sensitivity calculated by the sensitivity calculation unit 13, and until the stability calculated by the stability calculation unit 11 is determined to be stable. The output amount of the extracted renewable energy power generation device 6 is gradually reduced by adding the reduction amount P2 to determine the total reduction amount P3. The reduction amount P2 corresponds to the second reduction amount in the claims.

(Reduction target determination unit 15)
The reduction target determination unit 15 provides a renewable energy power generation device 6 that reduces the output amount when an accident related to a assumed target accident case occurs based on the total reduction amount P3 determined by the renewable energy reduction amount addition unit 14. decide.

The above is the configuration of the power system stabilizing device 1.

[1-2. Action]
Next, an outline of the operation of the power system stabilizing device 1 of the present embodiment will be described with reference to FIGS. 1 to 5. FIG. 3 is a diagram showing a flow of the program of the arithmetic unit 10. The program shown in FIG. 3 is built in the arithmetic unit 10. In this embodiment, as an example, the calculation of the reduction amount of the output of the renewable energy power generation device 6 corresponding to the online pre-calculation type stabilization system will be described. The power system stabilizer 1 is not limited to the one corresponding to the online pre-calculation type stabilization system. The power system stabilizing device 1 operates and calculates according to the following procedure at a predetermined cycle such as 30 seconds and 1 minute.

(Step S11: Stability calculation)
The calculation unit 10 calculates the stability of the assumed target accident case in the power system including the synchronous machine 4 and the renewable energy power generation device 6 by the stability calculation unit 11. The stability is the power information about the transmission line 2-2 measured by the information collecting devices 8-8 and 8-9, the system configuration such as the preset branch impedance and topology, the information such as the generator constant, and the excitation control. Based on the system information, it is calculated by transient stability calculation for the assumed target accident case.

Generally, the transient stability calculation is performed by simulating the backbone system in detail. From the viewpoint of the constraint of calculation time, the evaluation of the detailed simulation including the lower voltage class such as 100V system is not the target of the transient stability calculation, and is not the target of the specific voltage class such as extra high or lower. The computational model created by aggregating and simulating the system is evaluated.

Based on FIG. 4, a simulation at the time of creating a system model according to the voltage class will be described. As shown in FIG. 4, a centralized simulation is performed for a system having an extra high voltage (66 kV) or less excluding the synchronous machine 4, and a detailed simulation is performed for a voltage class higher than the extra high voltage. The renewable energy power generation device 6 is generally connected to a voltage class below the extra high voltage. Similar to the load, the renewable energy power generation device 6 connected to the system above the extra height is considered to be a model that is aggregated and connected to the node at the extra height.

The output of the aggregated renewable energy power generation device 6 is the aggregate of the measured values, estimated values, and predicted values of the individual renewable energy power generation devices 6 to be aggregated, or the aggregated renewable energy power generation device 6 It may be a predicted value or an estimated value of the output of. In addition to the extra-high renewable energy power generation device 6, the integrated renewable energy power generation device 6 includes a renewable energy power generation device 6 of a lower voltage class such as a residential photovoltaic power generation device. Is also good.

The stability calculation unit 11 aggregates the renewable energy power generation devices 6 and repeatedly calculates the stability. As will be described later, the output amount of the renewable energy power generation device 6 is sequentially reduced by the reduction amount P2 by the renewable energy reduction amount addition unit 14. In FIG. 4, the reduction amount P2 is 50 MW. The stability calculation unit 11 calculates the stability each time the output amount of the renewable energy power generation device 6 is reduced by the reduction amount P2. The stability calculation unit 11 evaluates, for example, fluctuations in the internal phase difference angle of the synchronous machine, frequency fluctuations, and voltage fluctuations, and calculates the stability.

(Step S12: Judgment of stability)
When the calculation unit 10 determines that the power system is unstable based on the stability calculated by the stability calculation in step S11 (NO in step S12), the program shifts to step S13. If the arithmetic unit 10 does not determine that it is unstable (YES in step S12), the program proceeds to step S20.

(Step S13: Confirmation of presence / absence of voltage drop)
When it is determined that the stability calculated by the stability calculation in step S11 is unstable, the calculation unit 10 confirms whether or not there is a voltage drop in the power system by the acceleration tendency synchronizer extraction unit 12.

The types of step-out of the synchronous machine 4 are step-out due to the expansion of the phase difference between the systems after the accident (hereinafter referred to as step-out due to inter-system sway) and synchronization near the area where the local voltage drop occurs. It is roughly classified into the local step-out of the machine 4 (hereinafter referred to as local step-out). Local step-out may occur due to a drop in local voltage due to an increase in inter-system phase difference due to inter-system sway. That is, local step-out may occur indirectly due to inter-system sway.

In this case, unless the inter-system sway, which is the root cause of the local step-out, is suppressed, the step-out phenomenon may not be improved even if the acceleration of the local step-out synchronous machine 4 is suppressed. .. In the present embodiment, when local step-out occurs indirectly due to inter-system sway, the renewable energy power generation device 6 which is effective in suppressing the inter-system sway, which is the root cause, is instructed to reduce or stop the output amount. Select as a target.

Specifically, the voltage of a specific node is monitored based on the stability calculated in step S11. When the voltage of a specific node falls below the threshold value of the voltage predetermined by the operator, the time when the voltage falls below the threshold value is set as the voltage drop time, and the sensitivity calculation unit 13 determines the voltage drop for one synchronous machine 4 in step S16 described later. Evaluate with acceleration up to the time. This makes it possible to compare the acceleration state of the synchronous machine directly caused by the inter-system sway in the time domain before the local step-out that can occur after the voltage drop time, and if the local step-out occurs after the voltage drop time. However, it is possible to select a renewable energy power generation device 6 that is effective in suppressing inter-system sway, which is the root cause thereof.

(Step S14: Extraction of Synchronous Machine 4 with Acceleration Trend)
Based on the stability calculated by the stability calculation in step S11, the calculation unit 10 calculates the acceleration of the synchronous machine 4 by the acceleration tendency synchronous machine extraction unit 12, and extracts one or more acceleration tendency synchronous machines 4. do. The accelerating tendency synchronous machine 4 is extracted from, for example, the generator 4 determined to be out of step by the stability calculation in step S11.

The acceleration is calculated based on, for example, the internal phase difference angle of the synchronous machine 4 within the designated time and the maximum value of the change from the initial value of the internal phase difference angle. When the voltage of the power system falls below the threshold value, the designated time is set as the voltage drop time, and the acceleration of the synchronous machine 4 is calculated.

(Step S15: Judgment as to whether the deceleration sensitivity of the synchronous machine 4 has been calculated for all the target candidate renewable energy power generation devices 6)
When the calculation unit 10 determines that the deceleration sensitivity of the synchronous machine 4 has been calculated for the target candidate all renewable energy power generation device 6 by the sensitivity calculation in step S17 described later (YES in step S15), the program is set to step S19. Move to. If the arithmetic unit 10 does not determine that the deceleration sensitivity of the synchronous machine 4 has been calculated for the fully renewable energy power generation device 6 (NO in step S15), the program proceeds to step S16.

(Step S16: Calculate the deceleration sensitivity before and after the output increase of the target candidate renewable energy power generation device 6)
If it is not determined in step S15 that the deceleration sensitivity of the synchronous machine 4 has been calculated for the fully renewable energy power generation device 6, the calculation unit 10 is a candidate for reducing the output amount by the sensitivity calculation unit 13. Among the energy power generation devices 6, one renewable energy power generation device 6 is sequentially selected, and the acceleration of the synchronous machine 4 when the output amount is reduced by the reduction amount P1 is calculated. The synchronous machine 4 for which the acceleration is calculated is the synchronous machine 4 having an acceleration tendency extracted in step S14.

The calculation unit 10 uses the sensitivity calculation unit 13 to determine the acceleration A1 of the synchronous machine 4 and the output amount of the renewable energy power generation device 6 when the output amount of one renewable energy power generation device 6 is reduced by the reduction amount P1. Calculate the acceleration A2 of the synchronous machine 4 when it is not reduced. Acceleration A1 and acceleration A2 of the synchronous machine 4 are transmitted to the arithmetic unit 10 from the information collecting devices 8-1, 8-2, 8-3 connected to the synchronous machines 4-1, 4-2, and 4-3, respectively. To.

The acceleration A1 and the acceleration A2 of the synchronous machine 4 are the internal phase difference angle or the angular acceleration of the synchronous machine 4. The acceleration A1 and the acceleration A2 of the synchronous machine 4 may be acceleration indexes for increasing the power output of the synchronous machine 4.

(Step S17: Sensitivity calculation is performed)
The calculation unit 10 synchronizes the acceleration tendency when the sensitivity calculation unit 13 reduces the output amount of one renewable energy power generation device 6 by the reduction amount P1 when an accident related to a assumed target accident case occurs. The deceleration sensitivity of the synchronous machine 4 having an acceleration tendency extracted by the machine extraction unit 12 is calculated. The deceleration sensitivity B is the acceleration A1 of the synchronous machine 4 when the output amount of one renewable energy power generation device 6 is reduced by the reduction amount P1, and the synchronous machine when the output amount of the renewable energy power generation device 6 is not reduced. It is calculated by dividing the difference of the acceleration A2 of 4 from the reduction amount P1.

That is, the deceleration sensitivity B is
Deceleration sensitivity B = (acceleration A1-acceleration A2) / reduction amount P1 ... (1)
Is calculated by. It can be said that reducing the output amount of the renewable energy power generation device 6 having a large absolute value of the deceleration sensitivity B is more effective in stabilizing the power system. The deceleration sensitivity B is calculated individually when the output amount of the renewable energy power generation device 6-1 is reduced and when the output amount of the renewable energy power generation device 6-2 is reduced. After calculating the deceleration sensitivity B, the renewable energy power generation device 6 instructed to reduce the output amount receives a command from the power system stabilizing device 1 and returns the output amount to the output amount before the execution of this program.

(Step S18: Select the next target candidate from the renewable energy power generation device 6)
The calculation unit 10 calculates the deceleration sensitivity B for one renewable energy power generation device 6 in steps S16 and S17, and then selects the next candidate renewable energy power generation device 6. For the renewable energy power generation device 6 selected as the next candidate, the deceleration sensitivity B of the synchronous machine 4 is calculated in steps S16 and S17.

The processes of steps S16 and S17 are repeatedly executed until it is determined in step S15 that the deceleration sensitivity of the synchronous machine 4 has been calculated for the target candidate all renewable energy power generation device 6.

(Step S19: The output amount of the target candidate renewable energy power generation device 6 is further reduced by the reduction amount P2 to determine the total reduction amount P3).
When the calculation unit 10 determines that the deceleration sensitivity of the synchronous machine 4 has been calculated for the all renewable energy power generation device 6 (YES in step S15), the deceleration sensitivity B calculated in step S17 by the renewable energy reduction amount addition unit 14 The renewable energy power generation device 6 is extracted based on the above, and the output amount of the extracted renewable energy power generation device 6 is reduced until the stability calculated by the stability calculation in step S11 is determined to be stable in step S12. It is gradually decreased at P2 to determine the total reduction amount P3. The reduction amount P2 corresponds to the second reduction amount in the claims.

The upper limit of the reduction amount of the renewable energy power generation device 6 is, for example, the maximum output from the latest measurement information in consideration of the latest measurement information and the maximum output fluctuation range assumed within the calculation cycle of the power system stabilizer 1. It may be a value obtained by subtracting the fluctuation range. When the renewable energy power generation device 6 is photovoltaic power generation, the maximum output fluctuation range is the literature "Analysis and evaluation of the wide-area essence effect of photovoltaic power generation (Electrical Society Journal B, Vol. 130, No. 5, P491-). As described in "500)", it is possible to make an assumption from the area of the area of the renewable energy power generation device 6 that is simulated intensively and the time width in which the fluctuation is assumed.

(Step S20: Determine the target renewable energy power generation device 6)
The calculation unit 10 provides a renewable energy power generation device 6 that reduces the output amount when an accident related to a assumed target accident case occurs based on the total reduction amount P3 determined in step S19 by the reduction target determination unit 15. decide.

The above is the operation of the power system stabilizing device 1.

[1-3. effect]
(1) According to the present embodiment, the power system stabilizing device 1 is a stability calculation unit that calculates the stability of a power system including a synchronous machine 4 and a renewable energy power generation device 6 regarding a assumed target accident case. 11 and the acceleration tendency synchronous machine extraction unit 12 that extracts one or more acceleration tendency synchronous machines 4 when the stability calculated by the stability calculation unit 11 is determined to be unstable, and an assumed target. Acceleration tendency synchronous machine 6 extracted by the acceleration tendency synchronous machine extraction unit 12 when the output amount of the renewable energy power generation device 6 is reduced by the first reduction amount P1 when an accident related to an accident case occurs. The renewable energy power generation device 6 is extracted based on the deceleration sensitivity calculated by the sensitivity calculation unit 13 and the sensitivity calculation unit 13 for calculating the deceleration sensitivity of the above, and the stability calculated by the stability calculation unit 11 is determined to be stable. The target to be assumed based on the renewable energy reduction amount addition unit 14 that determines the total reduction amount P3 of the output amount of the extracted renewable energy power generation device 6 and the reduction total amount P3 determined by the renewable energy reduction amount addition unit 14. Since the reduction target determination unit 15 for determining the renewable energy power generation device 6 for reducing the output amount when an accident related to the accident case occurs is provided, the renewable energy power generation device 6 for reducing or stopping the output amount is selected. Further, since the renewable energy power generation device 6 having a high stabilizing effect is selected as the control target, it is possible to provide the power system stabilizing device 1 capable of efficiently ensuring the stability of the power system.

According to the present embodiment, the reduction amount of the output of the renewable energy power generation device 6 and the renewable energy power generation device 6 for reducing or stopping the output amount is determined, so that the output amount of the synchronous machine 4 can be suppressed. It is mitigated and can maintain the system's synchronization force, inertia, and voltage maintenance source.

(2) According to the present embodiment, the renewable energy reduction amount addition unit 14 extracts the renewable energy power generation device 6 based on the deceleration sensitivity calculated by the sensitivity calculation unit 13, and is calculated by the stability calculation unit 11. The output amount of the extracted renewable energy power generation device 6 is sequentially reduced by the second reduction amount P2 until the stability is judged to be stable, and the total reduction amount P3 is determined. The amount of decrease in the output of the device 6 can be suppressed to the minimum. As a result, it is possible to suppress the loss of the power generation company that owns the renewable energy power generation device 6.

(3) According to the present embodiment, the stability calculation unit 11 aggregates the renewable energy power generation devices 6 for each predetermined area to calculate the stability, and the renewable energy reduction amount additional unit 14 aggregates the renewable energy power generation devices 6 into predetermined areas. The total reduction amount P3 of the output amount of the renewable energy power generation device 6 is calculated for each area, and the reduction target determination unit 15 belongs to a predetermined area based on the total reduction amount P3 calculated by the renewable energy reduction amount addition unit 14. Since the renewable energy power generation device 6 is extracted and the total reduction amount is distributed to the extracted renewable energy power generation device 6, the renewable energy power generation device 6 and the renewable energy power generation device 6 that reduce or stop the output amount in each area. The amount of reduction in output can be determined.

In the stability calculation in the stability calculation unit 11, the power system can be aggregated and simulated according to the voltage class such as extra high voltage or higher, and the total reduction amount P3 required for stabilization is determined by the aggregation model, and then. By allocating the total reduction amount P3 to the renewable energy power generation device 6 belonging to the aggregated area, it is sufficient to simulate the system model up to a predetermined voltage class, for example, to save the labor of simulating the voltage class lower than the extra high voltage. Can be done. In addition, when allocating the total amount of reduction P3 to the aggregated renewable energy power generation device 6, fairness and cost can be further considered, and the loss of the power generation company that owns the renewable energy power generation device 6 can be suppressed. be able to.

(4) According to the present embodiment, the reduction of the output amount of the renewable energy power generation device 6 is performed by stopping the output of the renewable energy power generation device 6, so that the renewable energy that reduces or stops the output amount. The power generation device 6 can be selected and the renewable energy power generation device 6 can be easily instructed.

(5) According to the present embodiment, the output amount of the renewable energy power generation device 6 is reduced by reducing the output amount of the renewable energy power generation device 6 to a predetermined ratio, so that the output amount is reduced or A plurality of renewable energy power generation devices 6 to be stopped can be selected, and instructions can be easily given to the renewable energy power generation device 6.

(6) Acceleration tendency The synchronous machine extraction unit 12 evaluates the acceleration of the synchronous machine until the time when the voltage of the power system falls below the threshold value (voltage drop time), and even if local step-out occurs, it is the root cause. It is possible to select a renewable energy power generation device 6 that efficiently contributes to the suppression of a certain inter-system sway.

The renewable energy reduction amount addition unit 14 sets in advance the upper limit of the reduction amount in consideration of the maximum output fluctuation range of the renewable energy power generation device 6, so that the renewable energy power generation device can be used within the calculation cycle of the power system stabilizer 1. Even when 6 is reduced, it is possible to reliably control the control amount determined by the renewable energy reduction amount addition unit 14 and the reduction target determination unit 15.

[2. Other embodiments]
Although embodiments including modifications have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope of the invention described in the claims and the equivalent scope thereof, as are included in the scope and gist of the invention. The following is an example.

(1) In the above embodiment, the power system stabilizing device 1 determines the renewable energy power generation device 6 that reduces the output amount in the event of an accident and the output reduction amount. However, the power system stabilizing device 1 may determine the renewable energy power generation device 6 and the synchronous machine 4 that reduce the output amount in the event of an accident, and determine the output reduction amount. The power system stabilizing device 1 determines the renewable energy power generation device 6 for reducing the output amount and the output reduction amount in preference to the synchronous machine 4. The power system stabilizing device 1 determines the synchronous machine 4 for reducing the output amount and the output reduction amount when the renewable energy power generation device 6 for reducing the output amount does not exist.

(2) In the above embodiment, the deceleration sensitivity B is the acceleration A1 of the synchronous machine 4 when the output amount of one renewable energy power generation device 6 is reduced by the reduction amount P1 and the output of the renewable energy power generation device 6. It is calculated by dividing the difference of the acceleration A2 of the synchronous machine 4 from the reduction amount P1 when the force is not reduced, but the calculation method is not limited to this. For example, the acceleration A1 of the synchronous machine 4 when the output amount of one renewable energy power generation device 6 is reduced by the reduction amount P1, and the acceleration of the synchronous machine 4 when the output amount of the renewable energy power generation device 6 is not reduced. It may be calculated by the difference of A2.

(3) In the above embodiment, the renewable energy power generation device 6 for reducing the output amount is determined based on the total reduction amount P3 determined in step S19, but the method for determining the renewable energy power generation device 6 is , Not limited to this. For example, as shown in FIG. 5, the past output reduction amount is cumulatively calculated, and the priority of the renewable energy power generation device 6 having a small past output reduction amount is raised from the viewpoint of fairness. The renewable energy power generation device 6 that reduces the output amount may be selected. In addition, when the electric power company bears the compensation fee due to the reduction of the output amount, the renewable energy power generation device 6 that reduces the output amount by raising the priority of the renewable energy power generation device 6 having the smaller compensation fee. May be selected.

(3) In the above embodiment, the renewable energy power generation device 6 that reduces the output amount and the output reduction amount are determined in the event of an accident, but the stability calculation unit 11 determines the renewable energy power generation device 6. Stability is calculated by aggregating for each predetermined area, and the total reduction amount of the output amount of the renewable energy power generation device 6 is calculated for each predetermined area aggregated by the renewable energy reduction amount addition unit 14, and the reduction target determination unit is used. In 15, the renewable energy power generation device 6 belonging to a predetermined area is extracted based on the total reduction amount calculated by the renewable energy reduction amount addition unit 14, and the total reduction amount is distributed to the extracted renewable energy power generation device 6. You may.

1 ... Power system stabilizer 2,2-1,2-2 ... Transmission line 3,3-1,3-2,3-3 ... Transformer 4,4-1,4-2 , 4-3 ... Synchronizer 5,5-1,5-2,5-3 ... Circuit breaker 6,6-1,6-2 ... Renewable energy power generator 7,7-1, 7-2 ... Accident detection device 8,8-1,8-2,8-3,8-4,8-5,8-6,8-7,8-8,8-9 ...
Information collection device 9 ... Power system 10 ... Calculation unit 11 ... Stability calculation unit 12 ... Acceleration tendency synchronous machine extraction unit 13 ... Sensitivity calculation unit 14 ... Re-energy reduction amount addition unit 15 ... Decrease target determination unit 20 ... Control unit

Claims (6)

A stability calculation unit that calculates the stability of an assumed accident case in an electric power system including a synchronous machine and a renewable energy power generation device.
When the stability calculated by the stability calculation unit is determined to be unstable, the acceleration tendency synchronous machine extraction unit for extracting one or more acceleration tendency synchronous machines, and the acceleration tendency synchronous machine extraction unit.
The acceleration extracted by the acceleration tendency synchronous machine extraction unit when the output amount of the renewable energy power generation device is reduced by the first reduction amount when an accident related to the assumed target accident case occurs. Sensitivity calculation unit that calculates the deceleration sensitivity of the trend synchronous machine,
The extracted renewable energy power generation device is extracted based on the deceleration sensitivity calculated by the sensitivity calculation unit, and the stability calculated by the stability calculation unit is determined to be stable. Renewable energy reduction amount addition part that determines the total reduction amount of the output amount of
Based on the total reduction amount determined by the renewable energy reduction amount addition unit, the reduction target determination unit that determines the renewable energy power generation device that reduces the output amount when an accident related to the assumed target accident case occurs. ,
Equipped with
The renewable energy reduction amount addition unit extracts the renewable energy power generation device in descending order of the deceleration sensitivity calculated by the sensitivity calculation unit, and the stability calculated by the stability calculation unit is determined to be stable. A power system stabilizing device that sequentially reduces the output amount of the extracted renewable energy power generation device by the second reduction amount to determine the total reduction amount . The stability calculation unit aggregates the renewable energy power generation devices for each predetermined area and calculates the stability.
The renewable energy reduction amount addition unit calculates the total reduction amount of the output amount of the renewable energy power generation device for each of the aggregated predetermined areas.
The reduction target determination unit extracts the renewable energy power generation device belonging to the predetermined area based on the total reduction amount calculated by the renewable energy reduction amount addition unit, and reduces the amount to the extracted renewable energy power generation device. Allocate the total amount,
The power system stabilizing device according to claim 1 . The reduction in the output amount of the renewable energy power generation device is performed by stopping the output of the renewable energy power generation device.
The power system stabilizer according to claim 1 or 2 . The reduction in the output amount of the renewable energy power generation device is performed by reducing the output amount of the renewable energy power generation device to a predetermined ratio.
The power system stabilizer according to claim 1 or 2 . The acceleration tendency synchronous machine extraction unit extracts the acceleration tendency synchronous machine by comparing the accelerations of the synchronous machines up to the designated calculation time, and when the reference voltage of the system falls below the threshold within the designated calculation time, the reference voltage is set. The power system stabilizing device according to any one of claims 1 to 4 , wherein the time below the threshold value is set as the designated calculation time. The renewable energy reduction amount addition unit assumes a case where the renewable energy power generation device is reduced by the maximum output fluctuation range assumed within a predetermined period, and the maximum output fluctuation range from the output of the current renewable energy power generation device. The output after the assumed fluctuation after deducting is set as the upper limit of the total reduction amount.
The power system stabilizing device according to any one of claims 1 to 5 .

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