JP6493609B1 - Power generation control system and control program - Google Patents

Abstract

An object of the present invention is to prevent bias of output restriction of power generation therapy to some types of generators when the total value of a plurality of types of generators exceeds a threshold. A determination unit determines whether a total value of generated power output by a plurality of types of generators exceeds a predetermined threshold value, and when the total value exceeds the threshold value A condition calculation unit for calculating a common condition for suppressing the generated power with respect to the generator of the above, and controlling each generator based on the common condition to limit the total value to the threshold value or less And a control unit. [Selected figure] Figure 3

Description

  The present invention relates to a power generation control system and a control program.

Conventionally, a power generation system is known in which a plurality of types of generators such as a solar power generator and a wind power generator are connected to the same interconnection point. It is necessary to limit the generated power when the total value of power at the interconnection point exceeds the threshold. There is known a technology for limiting the power generation of a wind power generator without limiting the power generation of a solar power generator in order to give priority to solar power generation (see, for example, Patent Literature 1 and Patent Literature 2).
[Prior art document]
[Patent Document]
[Patent Document 1] Patent No. 6105138 [Patent Document 2] Patent No. 6108510

  However, when the combined value of a plurality of types of generators exceeds the threshold, biasing the output restriction of the generated power to some types of generators increases the risk of failure of the generators subjected to the output restriction. Therefore, it is desirable to prevent biasing the output restriction of the generated power to some types of generators.

  In a first aspect of the present invention, a power generation control system is provided. The power generation control system may include a determination unit. The determination unit may determine whether or not the total value of the generated power output by the plurality of types of generators exceeds a predetermined threshold. The power generation control system may include a condition calculation unit. The condition calculation unit may calculate a common condition for suppressing the generated power with respect to each generator when the total value exceeds the threshold. The power generation control system may include a controller. The control unit may control each generator based on the common condition. The control unit may limit the sum value to a threshold value or less.

  The plurality of types of generators may include wind power generators and solar power generators.

  The condition calculation unit may calculate the limit value of the generated power output from each generator as a common condition. The condition calculation unit may calculate a value obtained by dividing the generated power limit value by the rated power value of each generator as a common condition. The condition calculation unit may calculate a value obtained by dividing the limit value of the generated power by the output power value before limitation of each generator as a common condition.

  The condition calculation unit may calculate, as a common condition, a loss power value generated by the control unit limiting the generated power output from each generator. The condition calculation unit may calculate a value obtained by dividing the loss power value by the rated power value of each generator as a common condition. The condition calculation unit may calculate a value obtained by dividing the loss power value by the pre-limit output power value of each generator as a common condition.

  The condition calculation unit may calculate the amount of loss caused by the control unit limiting the generated power output from each generator as a common condition. The condition calculation unit may calculate a value obtained by dividing the loss amount by the rated power value of each generator as a common condition. The condition calculation unit may calculate a value obtained by dividing the loss amount by the output power value before limitation of each generator as a common condition.

  The power generation control system may further include a first storage unit. The first storage unit may store maintenance cost information. The maintenance information may indicate, for each generator, the relationship between the maintenance cost and at least one of the number of times and the time that the control unit limits the generated power output from the generator. The maintenance cost may vary according to the number of times and / or time that the control unit limits the generated power output by the generator.

  The power generation control system may further include a second storage unit. The second storage unit may store power sale price information. The power sale amount information may indicate the relationship between the loss power value and the power sale loss amount. The power loss value may be generated by the control unit limiting the generated power output from the generator. The power sale loss amount may vary depending on the power loss value. The condition calculation unit may calculate the loss amount based on the maintenance cost information and the power sale amount information.

  The increase in maintenance cost that occurs per unit time or per unit time when the control unit limits the generated power in a specific type of generator among multiple types of generators, the control unit limits the generated power in other types of generators It may be larger than the increase in maintenance cost that occurs per unit time or unit time.

  Certain types of generators may generate power using mechanical drives.

  The control unit may suppress the variation of the generated power with respect to the specific type of generator more than other types of generator.

  A minimum value may be set in at least a part of the plurality of types of generators. The minimum value may be the minimum value of generated power that the generator should output when the generator is driven. The power generation control system may further include a correction unit. The correction unit may correct the common condition according to each generator such that the generated power output from the generator for which the minimum value is set is equal to or more than the minimum value.

  The correction unit may add the offset amount based on the minimum value to the common condition so that the generated power output from the generator for which the minimum value is set is equal to or more than the minimum value.

  The correction unit may determine whether or not the generated power output by the generator for which the minimum value is set is less than the minimum value when each generator is controlled according to the common condition. The correction unit is configured such that, when the generated power output from the generator for which the minimum value is set is less than the minimum value, the generated power output from the generator for which the minimum value is set is greater than or equal to the minimum value , You may correct the common conditions. The control unit may apply the corrected common condition to each generator to limit the sum value to a threshold value or less.

  The plurality of types of generators may include wind turbines. In the case of driving the wind power generator, at least a part of the wind power generator may be set to the minimum value of the generated power to be output by the wind power generator.

  In a second aspect of the present invention, a power generation control system is provided. The power generation control system may include a determination unit. The determination unit may determine whether or not the total value of the generated power output by the plurality of types of generators exceeds a predetermined threshold. The power generation control system may include a controller. The control unit controls each of the plurality of types of generators under the condition that the variation of the generated power is suppressed more than that of other types of generators, and the total value is equal to or less than the threshold value. May be restricted to Certain types of generators may generate power using mechanical drives. The particular type of generator may be a wind generator.

In a third aspect of the present invention, a control program is provided. The control program may cause the computer to execute a procedure of determining whether or not the total value of the generated power output by the plurality of types of generators exceeds a predetermined threshold. The control program may cause the computer to execute a procedure for calculating a common condition for suppressing the generated power for each generator when the total value exceeds the threshold. The control program may cause the computer to execute a procedure of controlling the respective generators and transmitting a control signal which limits the sum to a threshold value or less based on the common conditions.
In a fourth aspect of the present invention, a control program is provided. The control program may cause the computer to execute a procedure of determining whether or not the total value of the generated power output by the plurality of types of generators exceeds a predetermined threshold. The control program controls each generator to suppress the sum value to a threshold value or less on condition that the variation of the generated power is suppressed more than other types of generators for a specific type of generator among a plurality of types of generators. The computer may execute a procedure of transmitting control signals limited to

  Note that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a subcombination of these feature groups can also be an invention.

1 schematically shows a power generation system 2 in which a power generation control system 100 of the present invention is used. 1 shows an example of a power generation system 2 having a power generation control system 100 according to a first embodiment. The schematic structure of the electric power generation control system 100 which uses the restriction ratio with respect to a rated power value as common conditions is shown. The control content in the electric power generation control system of a comparative example is shown. An example of the control content in the electric power generation control system 100 of 1st Embodiment is shown. An example of the output restriction in a comparative example is shown. An example of the output restriction | limiting in 1st Embodiment is shown. It is a flowchart which shows an example of the process in the electric power generation control system 100 of 1st Embodiment. The schematic structure of the electric power generation control system 100 which uses a limit value as common conditions is shown. An example of the power generation system 2 which has the other power generation control system 100 in 1st Embodiment is shown. The schematic structure of the electric power generation control system 100 which uses the restriction ratio with respect to a pre-limit electric power value as common conditions is shown. The schematic structure of the electric power generation control system 100 which uses a loss electric power value as common conditions is shown. 1 shows a schematic configuration of a power generation control system 100 using a loss amount as a common condition. An example of the maintenance cost information stored in the 1st storage part 142 is shown. 13 shows an example of power sale price information stored in a second storage unit 144. An example of schematic structure of the electric power generation control system 100 provided with the correction | amendment part which correct | amends common conditions is shown. 7 shows another example of the correction unit. It is a flowchart which shows an example of a correction process of a restriction | limiting ratio. An example of the electric power generation system 2 which has the electric power generation control system 200 of 2nd Embodiment is shown. The schematic structure of a wind power generator is shown. It is a flowchart which shows an example of the process in the electric power generation control system 200 of 2nd Embodiment. An example of a structure of the computer 2200 which concerns on this embodiment is shown.

  Hereinafter, the present invention will be described through the embodiments of the invention, but the following embodiments do not limit the invention according to the claims. Moreover, not all combinations of features described in the embodiments are essential to the solution of the invention.

First Embodiment
FIG. 1 shows an outline of a power generation system 2 in which a power generation control system 100 of the present invention is used. The power generation system 2 includes a plurality of types of generators, a power generation control system 100, and an interconnection point 30. In this example, the power generation system 2 includes a plurality of solar power generators 10-1 and 10-2, a plurality of wind power generators 20-1 and 20-2, a hydroelectric generator 42, and a thermal power generator as a plurality of types of generators. A generator 43 is included. However, the type and number of generators are not limited to those shown in FIG. The plurality of types of generators may include the solar power generators 10-1 and 10-2 and the wind power generators 20-1 and 20-2 without including the hydroelectric generator 42 and the thermal power generator 43.

  The plurality of types of generators 10-1, 10-2, 20-1, 20-2, 42, and 43 are electrically connected to the same interconnection point 30 via a transmission line. Electric power generated by a plurality of types of generators is supplied to the substation 4 via the interconnection point 30. The substation 4 may be connected to the commercial power system 6.

  When the power producer links the generator with the commercial power grid 6, the maximum output power (sometimes referred to as a grid connection capacity) supplied by the generator is determined in advance. The interconnection capacity may be determined based on the rated output of the generator. When a plurality of types of generators are connected to one interconnection point 30, the total value of the generated power of all the generators is controlled to be less than or equal to the interconnection capacity. In this example, the power generation control system 100 controls each generator so that the total value of the generated power output by the plurality of types of generators does not exceed the threshold value determined below the connection capacity.

  A plurality of types of generators may be installed by one power producer, or may be installed by a plurality of power producers. The power generation control system 100 may be provided by a power generator operating a generator. However, the manager of the commercial power grid 6 may use the power generation control system 100 to limit the output power from each generator.

  FIG. 2 shows an example of a power generation system 2 having the power generation control system 100 of the first embodiment. In FIG. 2, the power generation system 2 exemplifies a case including a solar power generator 10 and a wind power generator 20 as a plurality of types of power generators. The number of installed solar power generators 10 and the number of installed wind power generators 20 may be one or more.

  The power generation system 2 includes a power conditioner 12 for solar power generation. The power conditioner 12 is called a PCS (Power Conditioning System). The power conditioner 12 may include an inverter device 14 and an output control unit 16. The inverter device 14 is connected to the solar power generator 10. The inverter device 14 converts direct current power generated by the solar power generator 10 into alternating current power. The output control unit 16 receives a control signal from the power generation control system 100. The output control unit 16 controls the generated power of the solar power generator 10 according to the received control signal. Specifically, the output control unit 16 controls AC power output via the inverter device 14.

  The power generation system 2 includes a wind power generation control unit 22. The wind power generation control unit 22 controls the generated power of the wind power generator 20. Specifically, the wind power generator 20 generates electric power using a blade of a wind turbine as a mechanical drive unit. In one example, the wind power generation control unit 22 controls the generated power of the wind power generator 20 by pitch control control that adjusts the angle of the blades of the wind turbine.

  The power conditioner 12 and the interconnection point 30 may be connected by a transmission line 18. A transformer 36 may be provided between the power conditioner 12 and the interconnection point 30. A transformer 37 may be provided between the interconnection point 30 and the substation 4. The wind power generator 20 and the interconnection point 30 may be connected by a transmission line 24. The power generation system 2 may include a power meter 31. The power meter 31 measures the total value in which the generated power of the solar power generator 10 and the wind power generator 20 is summed up at the interconnection point 30.

  The power generation control system 100 includes a determination unit 110, a condition calculation unit 120, a control unit 130, and a storage unit 140. The power generation control system 100 may be configured by a computer such as a PLC (programmable logic controller). Each unit such as the determination unit 110, the condition calculation unit 120, and the control unit 130 may be realized as a function of a CPU that executes a control program.

  The determination unit 110 acquires a total value of generated power output by a plurality of types of generators. In one example, the determination unit 110 may obtain the sum value from the power meter 31. The determination unit 110 determines whether the sum value exceeds a predetermined threshold. The threshold may be set to less than the interconnection capacity. For example, the threshold is set in the range of 90% to 99% of the interconnection capacity.

  The condition calculation unit 120 calculates a common condition for suppressing the generated power with respect to each of the plurality of types of generators when the total value exceeds the threshold. Specifically, the condition calculation unit 120 may calculate a common condition for each generator such as the solar power generator 10 and the wind power generator 20. The control unit 130 controls each of the solar power generator 10 and the wind power generator 20, which are a plurality of types of power generators, based on the common conditions, and limits the total value of the generated power to a threshold or less. For example, the control unit 130 transmits control signals to the output restriction mechanism of each of the solar power generator 10 and the wind power generator 20.

  The control unit 130 may control the solar power generator 10 by transmitting a first control signal to the output control unit 16 of the power conditioner 12. The control unit 130 may control the wind power generator 20 by transmitting a second control signal to the wind power generation control unit 22. The first control signal and the second control signal may be generated by converting the common condition calculated by the condition calculation unit 120 into a command format of each output restriction mechanism. The control unit 130 controls the solar power generator 10 and the wind power generation control unit 22 to limit the total value at the interconnection point 30 to a threshold value or less.

  The storage unit 140 may store in advance a threshold value to be compared with the total value in the determination unit 110. In addition, the storage unit 140 may store each piece of information used when the condition calculation unit 120 calculates a common condition. The information used to calculate the common condition may include at least one of rated power values of the plurality of types of generators, selling price information, maintenance cost information, weather information, and the like.

  The storage unit 140 may store information necessary for the control unit 130 to control each of a plurality of types of generators. The storage unit 140 outputs, as necessary information, destination information in the case of transmitting a control signal to output restriction mechanisms of a plurality of types of generators via a network, and common conditions calculated by the condition calculation unit 120 Information may be stored for conversion into the command format of the restriction mechanism.

  FIG. 3 shows a schematic configuration of a power generation control system 100 using a limit ratio to a rated power value as a common condition. In one example, the determination unit 110 includes a difference unit 111, a first limiter 112, a second limiter 113, a first integrator 114, a second integrator 115, a first comparator 116, and a second comparator 117.

  The difference unit 111 takes a difference between a total value of generated power at the interconnection point 30 and a predetermined threshold. In the present example, the difference unit 111 subtracts the threshold from the sum value. The output end of the difference unit 111 may be branched and connected to the first limiter 112 and the second limiter 113. The first limiter 112 is a signal restriction conversion unit that outputs a difference value when the difference value is 0 or more. The second limiter 113 is a signal restriction conversion unit that outputs a difference value when the difference value is less than zero.

  The output end of the first limiter 112 is connected to the input end of the first integrator 114. The output end of the second limiter 113 is connected to the output end of the second integrator 115. The first integrator 114 integrates the output from the output end of the first limiter 112, that is, the summed value when the summed value is equal to or greater than the threshold value for a predetermined time. On the other hand, the second integrator 115 integrates the output from the output end of the second limiter 113, that is, the sum value when the sum value is less than the threshold value for a predetermined time. The integrated values of the first integrator 114 and the second integrator 115 may be reset every predetermined time, or may be reset by the determination of the first comparator 116 and the second comparator 117.

  The output end of the first integrator 114 is connected to the input end of the first comparator 116. The output end of the second integrator 115 is connected to the input end of the second comparator 117. The first comparator 116 determines whether the integrated value from the first integrator 114 is equal to or greater than the first threshold + X1. In other words, the first comparator 116 determines whether the absolute value of the integrated value from the first integrator 114 is greater than or equal to the first threshold value X1. On the other hand, the second comparator 117 determines whether the integrated value from the second integrator 115 is less than or equal to the second threshold -X2. In other words, the second comparator 117 determines whether the absolute value of the integral value from the second integrator 115 is greater than or equal to the second threshold X2.

  In one example, the condition calculation unit 120 includes a restriction ratio subtraction unit 121, a restriction ratio addition unit 122, and a condition output unit 123. The condition calculation unit 120 of this example calculates the restriction ratio based on the rated power value as a common condition for suppressing the generated power with respect to each of the plurality of types of generators. The restriction ratio means a value obtained by dividing the restriction value of the generated power output by each generator by the rated power value of each generator. For example, when the rated power value of the generator is 10 MW, if the generated power of the generator is limited to 9 MW, the limit value is 9 MW, and the limiting ratio based on the rated power value is 90% Become.

  In one example, in the first comparator 116 of the determination unit 110, when the integrated value is equal to or greater than the first threshold + X1 (the absolute value of the integrated value is equal to or greater than the first threshold X1), the restriction ratio subtraction unit 121 determines in advance As described above, -C% is output, and 0% is output when the integral value is less than the first threshold + X1 (the absolute value of the integral is less than the first threshold X1). C% is a predetermined value, for example, 1%. Similarly, in the second comparator 117 of the determination unit 110, when the integral value is less than or equal to the second threshold-X2 (the absolute value of the integral is greater than or equal to the second threshold X2), the restriction ratio addition unit 122 As defined, it outputs + C%, and outputs 0% if the integral value is larger than the second threshold -X2 (the absolute value of the integral is less than the second threshold X2). The absolute value of the first threshold X1 and the absolute value of the second threshold X2 may be the same, and the absolute value of the second threshold X2 may be larger than the absolute value of the first threshold X1. In the case where the absolute value of the second threshold X2 is made larger than the absolute value of the first threshold X1, hunting that frequently repeats increase and decrease of the limit ratio can be suppressed.

  The condition output unit 123 adds the output of the restriction ratio subtraction unit 121 and the output of the restriction ratio addition unit 122 to the previous restriction ratio. If the previous limit ratio does not exist, the limit ratio defined as the initial value may be used. Thus, when the total value of the generated power output by the plurality of types of generators is equal to or greater than the threshold for a predetermined integration time, the condition calculation unit 120 gradually decreases the restriction ratio to increase the output restriction. Do. On the other hand, when the total value of the generated power is less than the threshold for a predetermined integration time, the condition calculation unit 120 causes the power generation control system 100 to gradually increase the restriction ratio in order to reduce the output restriction.

  The present embodiment includes the first limiter 112, the second limiter 113, the first integrator 114, the second integrator 115, the first comparator 116, and the second comparator 117. However, the configuration of the determination unit 110 is not limited to this case. However, by using the first integrator 114 and the second integrator 115, the effect of preventing hunting can be obtained.

  The control unit 130 acquires the determined restriction ratio as a common condition. The control unit 130 controls each generator to limit the sum value to a threshold value or less based on the common restriction ratio. In one example, the control unit 130 may calculate the limit value (MW) of the generated power of each generator by multiplying the determined limit ratio by the rated power value of each generator. The control unit 130 transmits the calculated limit value (MW) as a control signal to the output limiting mechanism of the plurality of types of generators. In the present example, the control unit 130 transmits control signals to the power conditioner 12 and the wind power generation control unit 22.

  The power conditioner 12 receiving the control signal controls the output of the generated power of the photovoltaic power generation 10-1. The wind power generation control unit 22 controls the output of the generated power of the wind power generators 20-1 and 20-2. The wind power generation control unit 22 may be provided for each of the wind power generators 20-1 and 20-2. The total value of the generated power at the interconnection point 30 is input to the difference unit 111, and the above-described process is repeated. By configuring such a feedback loop, the condition calculation unit 120 calculates common conditions for suppressing the generated power for each of a plurality of types of generators such as the solar power generator 10 and the wind power generator 20. can do.

  The processing by the determination unit 110, the condition calculation unit 120, and the control unit 130 in this example is executed, for example, in a control cycle of 5 milliseconds or more and 20 milliseconds or less, more preferably 10 milliseconds. After the control unit 130 sends the control signal to the power conditioner 12, it may take about one second until the generated power of the solar power generator 10 is controlled to the target value. After the control unit 130 sends the control signal to the wind power generation control unit 22, it may take about 5 seconds to 30 seconds until the generated power of the wind power generator 20 is controlled to the target value. Therefore, the responsiveness of the wind power generator 20 is lower than that of the solar power generator 10.

  FIG. 4 shows control contents in the power generation control system of the comparative example. FIG. 5 shows an example of control contents in the power generation control system 100 of the first embodiment. In the power generation control system of the comparative example, priority is given to the solar power generator (PV) 10. The wind power generator (WT) 20 is limited as a limit value (power reduction upper limit value) by “a value obtained by subtracting the generated power of photovoltaic power generation from a threshold value determined to be less than the interconnection capacity. Therefore, the loss power value (loss) due to the output limitation is biased to the wind power generator.

  On the other hand, according to the control contents in the power generation control system 100 of the first embodiment shown in FIG. 5, in order to suppress the generated power to each of the solar power generator 10 (PV) and the wind power generator 20 (WT) The common restriction ratio (output suppression rate) is calculated as the common condition of. And control part 130 controls each of a plurality of kinds of generators, such as solar power generator 10 and wind power generator 20, based on common conditions. Therefore, the power loss value (loss) due to the output limitation is distributed to each of the plurality of types of generators without being biased to the wind power generator.

  FIG. 6 shows an example of output limitation in the comparative example. FIG. 7 shows an example of output limitation in the first embodiment. FIG. 6 and FIG. 7 respectively show the relationship between the output power of each generator and the restriction ratio when the output power of the solar power generator 10 rises rapidly. In the comparative example shown in FIG. 6, the generated power of the solar power generator 10 (PV) is not limited, and the generated power of the wind power generator 20 (WT) is limited.

  According to the first embodiment shown in FIG. 7, a restriction ratio common to solar power generation (PV) and wind power generation (WT) is calculated. The control unit 130 may convert the common restriction ratio into a command format of the output restriction mechanism of photovoltaic power generation (PV) and wind power generation (WT) to generate a control signal. The control unit 130 transmits the control signal to the output restriction mechanism of photovoltaic power generation (PV) and wind power generation (WT). The control unit 130 limits the output of the solar power generator 10 (PV) and the output of the wind power generator 20 (WT). As a result, the total value is limited to within the threshold which is a value less than the interconnection capacity. The condition calculation unit 120 decreases the limit ratio to increase the output limit until the sum value falls below the threshold.

  Table 1 shows a numerical example of the power of each item in the case of the comparative example shown in FIG. The combined value before the output restriction at the interconnection point is 15.4 MW, which exceeds the threshold 12 MW at the interconnection point. In the case of the comparative example, the generated power of the solar power generator 10 is not limited. The remaining 3 MW obtained by subtracting the generated power (9 MW) of the solar power generation from the threshold (12 MV) at the interconnection point becomes the limit value (upper limit value) of the wind power generator (WT). As a result, for photovoltaic power generation, no loss power value (loss) occurs. In the wind power generator 20 (WT), the generated power (6.4 MW) before limitation is limited to the limit value (3 MW), so 3.4 MW is the loss power value (loss). Therefore, the power loss value is biased to the wind power generator.

  Table 2 shows a numerical example of the power in each item in the first embodiment shown in FIG. It is the same as the case of Table 1 that the total value before the output restriction at the interconnection point is 15.4 MW and exceeds the threshold 12 MW at the interconnection point. In the present example, the condition calculation unit 120 calculates the common restriction ratio as 67%. Therefore, the limit value (upper limit value) of the solar power generator 10PV is 6.7 MW by applying the limit ratio of 67% to the rated power value 10 MW. On the other hand, the limit value (upper limit value) of the wind power generator 20WT is 5.3 MW by applying the limit ratio of 67% to the rated power value of 8 MW. As a result, in the solar power generator 10, since the generated power (9 MW) before the limitation is limited to the limit value (6.7 MW), the power loss value (loss) is 2.3 MW. In the wind power generator 20, since the generated power of 6.4 MW before limitation is limited to the limit value (5.3 MW), 1.1 MW is a loss power value (loss).

  As described above, according to the power generation control system 100 of the first embodiment, the loss of power value (loss) due to the output restriction of the generated power is prevented from being biased to the specific type such as the wind power generator 20 (WT). Be done. In particular, when the operation of limiting the generated power in the wind power generator 20 (WT) is increased, the mechanical structure for adjusting the angle of the blade is burdened, and the failure rate tends to increase. According to the power generation control system of this embodiment, it is possible to prevent the operation of limiting the generated power from being biased to the specific type of generator, so it is possible to reduce the failure rate of the specific generator.

  Moreover, according to the power generation control system 100 of the first embodiment, different from the case where priority is given to solar power generation, output can be limited using common conditions among the respective generators. Therefore, for example, even when a plurality of types of generators are operated by a plurality of different power producers, the restriction ratio can be made the same among the power producers. Can be secured.

  FIG. 8 is a flowchart illustrating an example of processing in the power generation control system 100 according to the first embodiment. It is determined whether the total value of the generated power at the interconnection point 30 exceeds a predetermined threshold (step S101). If the summed value exceeds the threshold (step S101: YES), the determination unit 110 integrates the output power within a predetermined time (step S101). If the absolute value of the integral value is equal to or greater than the first threshold X1 (step S103: YES), the condition calculation unit 120 decreases the restriction ratio (%) by C% (step S104). As a result, if the total value exceeds the threshold value, the limit ratio (%), which is the ratio of the limit value to the rated power value, is lowered to increase the output limit.

  On the other hand, if the total value is equal to or less than the threshold (step S101: NO), the determination unit 110 integrates the generated power output within a predetermined time (step S105). If the absolute value of the integral value is equal to or greater than the second threshold X2 (step S106: YES), the condition calculation unit 120 increases the limit ratio (%) by C% (step S107). Thus, when the total value exceeds the threshold value, the limit ratio (%), which is the ratio of the limit value to the rated power value, is increased to reduce the output limit. And control part 130 controls each of a plurality of kinds of generators, such as solar power generator 10 and wind power generator 20, based on a common restriction ratio, and limits a total value to below a threshold. The control unit 130 transmits a control signal to the output restriction mechanism of a plurality of types of generators such as the solar power generator 10 and the wind power generator 20 (step S108). The process also returns to step S101.

  In the above description, when the combined value exceeds the threshold value, the condition calculation unit 120 that calculates the common condition for suppressing the generated power for each generator is used based on the common condition. And a control unit 130 configured to control the generator to limit the sum value to a threshold value or less. Then, as described in Table 2, a common condition common to each generator is a restriction ratio that is a value obtained by dividing the restriction value of the generated power output from each generator by the rated power value of each generator. Calculated as

  However, the common condition is not limited to the limit ratio. The limit value (upper limit value) may be used as a common condition. FIG. 9 shows a schematic configuration of a power generation control system 100 using the limit value as a common condition. The power generation control system 100 of FIG. 9 has the same structure as the power generation control system 100 shown in FIG. 3 except for the condition calculation unit 120.

  The condition calculation unit 120 includes a limit value subtraction unit 151, a limit value addition unit 152, and a condition output unit 123. The condition calculation unit 120 of this example calculates the limit value of the generated power output by each generator as a common condition for suppressing the generated power with respect to each of the plurality of types of generators. For example, when the rated power value of the generator is 10 MW, if the generated power of the generator is limited to 9 MW, the limit value (upper limit value) is 9 MW.

  In one example, in the first comparator 116 of the determination unit 110, when the integral value is equal to or greater than the first threshold + X1 (the absolute value of the integral is equal to or greater than the first threshold X1), the limit value subtraction unit 151 determines in advance. As described above, -C (MW) is output, and 0 (MW) is output when the integral value is less than the first threshold + X1 (the absolute value of the integral is less than the first threshold X1). C (MW) is a predetermined value. The unit may be kW. Similarly, in the second comparator 117 of the determination unit 110, when the integral value is less than or equal to the second threshold -X2 (the absolute value of the integral is greater than or equal to the second threshold X2), the limit value adder 152 is previously configured As defined, it outputs + C (MW), and outputs 0 (MW) if the integral value is larger than the second threshold -X2 (the absolute value of the integral is less than the second threshold X2) . The absolute value of the first threshold X1 and the absolute value of the second threshold X2 may be the same, and the absolute value of the second threshold X2 may be larger than the absolute value of the first threshold X1. Also in this example, it is possible to reduce the failure rate of a specific generator and to ensure the fairness among business operators.

  FIG. 10 shows an example of a power generation system 2 having another power generation control system 100 in the first embodiment. The power generation system of this example includes power meters 32 and 34 for measuring the generated power of each of a plurality of types of generators. The power meter 32 is connected to a power line between the solar power generator 10 and the interconnection point 30 and measures the generated power of the solar power generator 10. The power meter 34 is connected to a power line between the wind power generator 20 and the interconnection point 30 to measure the power generated by the wind power generator 20. The generated power values measured by the power meter 32 and the power meter 34 are supplied to the determination unit 110 of the power generation control system 100.

  Also, the generated power value measured by the power meter 32 may be given to the power conditioner 12. The generated power measured by the power meter 34 may be supplied to the wind power generation control unit 22. Except for these configurations, the power generation system 2 shown in FIG. 10 is the same as the structure of the power generation system 2 shown in FIG. Therefore, the repeated description is omitted. In addition, also in the power generation system 2 shown in FIG. 10, the wattmeter 31 which measures the total value shown in FIG. 2 may be separately provided.

  FIG. 11 shows a schematic configuration of a power generation control system 100 using a limit ratio to a pre-limit power value as a common condition. The power generation control system 100 may include an adding unit 119. The adding unit 119 may calculate the total value of the generated power output by a plurality of types of generators. Further, the condition calculation unit 120 in the power generation control system 100 shown in FIG. 11 is different from the condition calculation unit 120 in the power generation control system 100 shown in FIGS. 3 and 9. Except for the configurations of the adding unit 119 and the condition calculating unit 120, the configuration of the power generation control system shown in FIG. 11 is the same as the configuration of the power generation control system 100 shown in FIGS. Therefore, the repeated description is omitted.

  The condition calculation unit 120 includes a restriction ratio subtraction unit 161, a restriction ratio addition unit 162, and a condition output unit 123. The condition calculation unit 120 of the present example calculates a restriction ratio based on the unrestricted output power value as a common condition for suppressing the generated power for each of the plurality of types of generators. The limiting ratio in the power generation control system shown in FIG. 11 means a value obtained by dividing the limiting value for limiting the generated power output by each generator by the output power value before limitation of each generator. For example, if the pre-restriction generated power of the generator is 9 MW and the limit value is limited to 6.3 MW, the limit ratio based on the pre-limit output power value is 70%.

  The pre-limit output power value may be a generated power value of each generator at a predetermined time before the threshold of the interconnection point 30. The predetermined time is determined based on the control cycle. The storage unit 140 may sequentially store the generated power value of each generator and store information on the implementation of restriction of the generated power of the generator. The pre-limit power value acquiring unit 160 uses the information on the implementation of the limitation of the generated power stored in the storage unit 140 and the information of the generated power value of each generator at each time, and outputs the pre-limit output power value. You may get

  However, the present invention is not limited to the case where the power generation value of each generator at the time immediately before the threshold of the interconnection point 30 is exceeded is used as the pre-limit output power value. As the pre-limit output power value, it is possible to use a generated power estimated value that the generator is expected to be able to generate at the current time.

  Specifically, for the solar power generator 10, the estimated amount that can be generated may be predicted based on the predicted result of the solar radiation amount. For example, the pre-limit power value acquisition unit 160 predicts the amount of solar radiation during a predetermined time based on weather data acquired from an external server or a weather station. The pre-limit power value acquisition unit 160 calculates the generated power estimated value from the predicted amount of solar radiation. The cloud image by the weather satellite may be used to predict the amount of solar radiation, or the amount of solar radiation may be predicted based on the weather forecast.

  On the other hand, for the wind power generator 20, an estimated amount that can be generated may be predicted based on the prediction result of the wind speed. For example, the pre-limit power value acquisition unit 160 predicts the wind speed at a specific time based on weather data acquired from an external server or a weather station. The pre-limit power value acquisition unit 160 calculates a power generation estimated value from the predicted wind speed. The wind speed may be predicted based on the weather forecast.

  In FIG. 11, when it is determined by the first comparator 116 of the determination unit 110 that the integrated value is equal to or greater than the first threshold + X1 (the absolute value of the integrated value is equal to or greater than the first threshold X1), the limiting ratio subtraction unit 161 Outputs -C% as predetermined. On the other hand, when the integral value is less than the first threshold + X1 (the absolute value of the integral is less than the first threshold X1), the restriction ratio subtraction unit 161 outputs 0%. C% is a predetermined value, for example, 1%. Similarly, in the second comparator 117 of the determination unit 110, when the integral value is less than or equal to the second threshold-X2 (the absolute value of the integral is greater than or equal to the second threshold X2), the restriction ratio addition unit 162 Output + C% as defined. When the integral value is larger than the second threshold -X2 (the absolute value of the integral is less than the second threshold X2), the restriction ratio adder 162 outputs 0%. The absolute value of the first threshold X1 and the absolute value of the second threshold X2 may be the same, and the absolute value of the second threshold X2 may be larger than the absolute value of the first threshold X1.

  The condition output unit 123 adds the output of the restriction ratio subtraction unit 161 and the output of the restriction ratio addition unit 162 to the previous restriction ratio. If the previous limit ratio does not exist, the limit ratio defined as the initial value may be used. Thereby, when the total value of the generated power output by the plurality of types of generators is equal to or more than the threshold value over a predetermined integration time, the condition calculation unit 120 gradually increases the restriction ratio to increase the output restriction. make low. On the other hand, when the total value of the generated power is less than the threshold for a predetermined integration time, the condition calculation unit 120 gradually increases the restriction ratio to reduce the output restriction.

  The control unit 130 acquires the common restriction ratio as common condition information. The control unit 130 controls each generator to limit the sum value to a threshold value or less based on the common restriction ratio. The control unit 130 may calculate the limit value (MW) of the generated power of each generator by multiplying the determined limit ratio by the output power value before limit of each generator. The control unit 130 transmits the calculated limit value (MW) as a control signal to the output limiting mechanism of the plurality of types of generators. In the present example, the control unit 130 transmits control signals to the power conditioner 12 and the wind power generation control unit 22. The control unit 130 transmits a control signal to the wind power generation control unit 22.

  FIG. 12 shows a schematic configuration of a power generation control system 100 that uses a loss power value as a common condition. In FIG. 3, FIG. 9, and FIG. 11, the condition calculation unit 120 is the limit value of the generated power output by each generator, the limit value of the generated power divided by the rated power value of each generator, or A value obtained by dividing the limit value of the generated power by the output power value before limitation of each generator was calculated as a common condition. However, in the example illustrated in FIG. 12, the condition calculation unit 120 calculates, as a common condition, a power loss value generated by the control unit 130 limiting the generated power output by each generator. The power loss value may be a value obtained by subtracting the limit value from the pre-limit output power value. For example, if the pre-limit output power value is 9 MW and the limit value is 6.7 MW, the loss power value (loss) is 2.3 MW.

  The power generation control system 100 of FIG. 12 has the same structure as the power generation control system shown in FIGS. 10 and 11 except for the condition calculation unit 120.

  The condition calculation unit 120 includes a pre-limit power value acquisition unit 160, a loss power value addition unit 171, a loss power value subtraction unit 172, and a condition output unit 123. In the condition calculation unit 120 of this example, the condition calculation unit 120 is a common condition for suppressing the power loss of the generated power output from each generator with respect to each of a plurality of types of generators. Calculated as

  In one example, in the first comparator 116 of the determination unit 110, when the integrated value is equal to or greater than the first threshold + X1 (the absolute value of the integrated value is equal to or greater than the first threshold X1), As defined, it outputs + L (MW), and outputs 0 (MW) if the integral value is less than the first threshold + X1 (the absolute value of the integral is less than the first threshold X1). L (MW) is a predetermined value. The unit may be kW. Similarly, in the second comparator 117 of the determination unit 110, when the integral value is less than or equal to the second threshold −X2 (the absolute value of the integral is greater than or equal to the second threshold X2), the loss power value subtraction unit 172 As predetermined, output -L (MW), and if the integral is greater than the second threshold-X2 (the absolute value of the integral is less than the second threshold X2), then 0 (MW) Output. The absolute value of the first threshold X1 and the absolute value of the second threshold X2 may be the same, and the absolute value of the second threshold X2 may be larger than the absolute value of the first threshold X1.

  The condition output unit 123 adds the output of the loss power value addition unit 171 and the output of the loss power value subtraction unit 172 to the previous loss power value. If the previous loss power value does not exist, the loss power value defined as the initial value may be used. Thus, when the total value of the generated power output by the plurality of types of generators is equal to or greater than the threshold for a predetermined period, the condition calculation unit 120 increases the loss power value to limit the output. Enlarge. On the other hand, when the total value of the generated power is less than the threshold for a predetermined period, the condition calculation unit 120 reduces the loss power value and reduces the output restriction.

The control unit 130 acquires the determined loss power value as common information. The control unit 130 controls the respective generators based on the common power loss value to limit the total value to a threshold value or less. In one example, the control unit 130 subtracts the common loss power value from the pre-limit power value of each generator obtained by the pre-limit power value acquisition unit 160 to limit the generated power of each generator (MW) You may calculate The control unit 130 transmits the calculated limit value (MW) as a control signal to the output limiting mechanism of the plurality of types of generators. In the present example, the control unit 130 transmits control signals to the power conditioner 12 and the wind power generation control unit 22.

  In FIG. 12, the condition calculation unit 120 calculates the loss power value of the generated power output by each generator as a common condition for suppressing the generated power with respect to each of a plurality of types of generators. It has been shown. However, similarly to the relationships in FIG. 3, FIG. 9 and FIG. 11, a value obtained by dividing the loss power value by the rated power value of each generator, or a loss power value is divided by the output power value before limitation of each generator The value may be calculated as a common condition for suppressing the generated power for each of the plurality of types of generators. Description of repetition is omitted.

  FIG. 13 shows a schematic configuration of a power generation control system 100 using a loss amount as a common condition. FIG. 12 shows the case where the power loss value is used as a common condition. A power sale loss amount occurs due to the power loss value. Further, the maintenance cost may increase as the number and time of the control unit 130 limiting the generated power output from the generator increase. Therefore, in the power generation control system 100 shown in FIG. 13, the loss amount is calculated as the common condition in consideration of the maintenance cost and the power sale loss amount.

  The power generation control system 100 of FIG. 13 has the same configuration as the power generation control system 100 shown in FIG. 12 except for the condition calculation unit 120 and the storage unit 140. The storage unit 140 includes a first storage unit 142 and a second storage unit 144. The first storage unit 142 stores maintenance cost information. The maintenance cost information is information indicating, for each generator, the relationship between at least one of the number of times and time that the control unit 130 limits the generated power output by the generator, and the maintenance cost that varies according to the number of times and / or time. including. The maintenance cost information may be configured to be stored in the first storage unit 142 when the power generation company of each generator notifies the power generation control system 100.

  The second storage unit 144 stores the power sale amount information. The power sale price information indicates the relationship between the power loss value and the power sale loss amount that fluctuates depending on the power loss value. The power loss value is generated by the control unit 130 limiting the generated power output from the generator. Specifically, the power loss value may be a value obtained by subtracting the limit value from the pre-limit output power value. The pre-limit output power value is as described in FIG. The condition calculation unit 120 calculates the loss amount based on the maintenance cost information and the power sale amount information.

  FIG. 14 illustrates an example of maintenance cost information stored in the first storage unit 142. In one example, the maintenance cost information indicates, for each generator, information on an increase in maintenance cost that occurs per unit time or per unit time for which the control unit 130 limits the generated power. In this example, X11 and X12 are generators that generate power using a mechanical drive unit, and X21 and X22 are generators that do not generate power using a mechanical drive unit. In particular, the increase in maintenance cost per unit of output restriction (unit time) in generators X11 and X12 that generate power using mechanical drive units Y11 and Y12 do not generate power using mechanical drive units The increase in maintenance cost per output limit of the unit count (unit time) in the machine X21, X22 is larger than Y21, Y22. Note that the maintenance cost generated per unit time or per unit time may be changed according to the actual operation time.

  A generator that generates power using a mechanical drive may include a wind power generator 20, a hydroelectric generator 42, and a thermal power generator 43. In the case of the wind power generator 20, the generated power of the wind power generator 20 is controlled by pitch control control that adjusts the angle of the blades of the wind turbine. Therefore, as the number of times of output limitation or time increases, the mechanism part for pitch control is burdened, and the maintenance cost increases. In the case of the hydroelectric generator 42 and the thermal power generator 43, pitch control control is not performed. However, since the configuration for mechanically controlling the opening and closing of the mechanical parts of the water channel and the fuel channel is provided, the maintenance cost increases as the number or time of the output restriction increases.

  On the other hand, the solar power generator 10 is not a generator that generates electric power using a mechanical drive unit. Thus, the electrical circuit can be used to limit the output. Therefore, compared with the case where the generator is not generated by using a mechanical drive unit, the increase in maintenance cost per unit number of times (unit time) of output restriction is small or the increase in maintenance cost can be ignored.

  As described above, in a specific type of generator such as a wind power generator 20 that generates power using a mechanical drive unit among a plurality of types of generators, the control unit 130 limits generated power per unit time or per unit time The increase in maintenance cost occurring in the above is larger than the increase in maintenance cost occurring per unit time or per unit time when the control unit 130 limits the generated power in other types of generators such as the solar power generator 10. Therefore, from the viewpoint of maintenance costs, the control unit 130 suppresses the frequency of output control for a specific type of generator such as the wind power generator 20 than that of the other types of generators such as the solar power generator 10 Power fluctuations may be suppressed.

  FIG. 15 shows an example of the sale price information. The power sale price information may include the power sale price per unit power amount in association with the identification information of each generator. The power sale price per kWh for solar power generation may be higher than the power sale price per kWh for wind power generation. Also, the latest power sale price information may be obtained through the network.

  The condition calculation unit 120 includes a pre-limit power value acquisition unit 160, a loss amount addition unit 181, a loss amount subtraction unit 182, and a condition output unit 123. The condition calculation unit 120 of this example calculates the loss amount of the generated power output by each generator as a common condition for suppressing the generated power with respect to each of the plurality of types of generators. As described above, the condition calculation unit 120 may calculate the loss amount using the maintenance cost information and the power sale price information.

  In one example, in the first comparator 116 of the determination unit 110, if the integral value is equal to or greater than the first threshold + X1 (the absolute value of the integral is equal to or greater than the first threshold X1), As described above, the + L circle is output, and when the integral value is less than the first threshold + X1 (the absolute value of the integral is less than the first threshold X1), the 0 circle is output. The L circle is a predetermined value. The unit may be a currency unit other than yen. Similarly, in the second comparator 117 of the determination unit 110, when the integral value is less than or equal to the second threshold-X2 (the absolute value of the integral is greater than or equal to the second threshold X2), the loss amount subtraction unit 182 As defined, the -L circle is output, and the zero circle is output if the integral value is larger than the second threshold -X2 (the absolute value of the integral is less than the second threshold X2). The absolute value of the first threshold X1 and the absolute value of the second threshold X2 may be the same, and the absolute value of the second threshold X2 may be larger than the absolute value of the first threshold X1.

  The condition output unit 123 adds the output of the loss amount addition unit 181 and the output of the loss amount subtraction unit 182 to the previous loss power value. If the previous loss amount does not exist, the loss amount determined as the initial value may be used. Thereby, when the total value of the generated power output by the plurality of types of generators is equal to or more than the threshold value for a predetermined period, the loss amount is increased and the output limit is increased. On the other hand, when the total value of the generated power is less than the threshold value over a predetermined period, the loss amount is reduced and the output restriction is reduced.

  The control unit 130 acquires the determined loss amount as common information. The control unit 130 controls the respective generators to limit the sum value to a threshold value or less based on the common loss amount. Specifically, the control unit 130 may calculate the limit value (MW) of the generated power of each generator from the common loss amount based on the maintenance cost information and the power sale loss amount information. The control unit 130 transmits the calculated limit value (MW) as a control signal to the output limiting mechanism of the plurality of types of generators. In the present example, the control unit 130 transmits control signals to the power conditioner 12 and the wind power generation control unit 22.

  In FIG. 13, the condition calculation unit 120 has shown a case where the loss amount of each generator is calculated as a common condition for suppressing the generated power with respect to each of the plurality of types of generators. However, similarly to the relationships in FIG. 3, FIG. 9 and FIG. 11, a value obtained by dividing the loss amount by the rated power value of each generator, or a value obtained by dividing the loss amount by the unrestricted output power value of each generator It may be calculated as a common condition for suppressing the generated power for each of a plurality of types of generators. Description of repetition is omitted.

  FIG. 16 illustrates an example of a schematic configuration of a power generation control system 100 including a correction unit that corrects common conditions. In FIG. 16, the determination unit 110, the condition calculation unit 120, the control unit 130, and the storage unit 140 are the same as those of the power generation control system 100 shown in FIG. 3. However, in order to simplify the description, the detailed description is omitted in FIG. The condition calculation unit 120 calculates a common restriction ratio for each generator. In the power generation control system in FIG. 3, the calculated common restriction ratio is supplied to the control unit 130. On the other hand, the power generation control system 100 shown in FIG. 16 includes a correction unit 190 that corrects the restriction ratio, which is the calculated common condition, in accordance with each generator.

  A generator such as the wind power generator 20 may be provided with a minimum value of the output that can be reduced by output suppression. The power generation control system 100 can not drive with the generated power output from the wind power generator 20 suppressed to less than the minimum value. The power generation control system 100 must stop the wind power generator 20 and set the output to 0 as necessary. When a generator arises that must be shut down, regulation of the generated power of the other generator occurs. When a stop of the generator and a change in the number of generators to be driven and an adjustment of the power occur, it takes time to complete the stop and the change in the number of the generators, so that the output of the generated power may temporarily decrease.

  In addition, changing the number of generators driven frequently will cause disturbances in the power system. Therefore, when the minimum value of the generated power output in the generator is provided, the power generation control system 100 controls the generated power not to be less than the minimum value in the generator for which the minimum value is set. It is desirable to do.

  In the present embodiment, at least a part of the plurality of types of generators is set to the minimum value of the generated power to be output by the generators when the generators are driven. In particular, the plurality of types of generators include the wind power generator 20, and when at least a part of the wind power generator 20 drives the wind power generator 20, the minimum value of the generated power to be output by the wind power generator 20. May be set. However, the minimum value may be different for each generator.

  The correction unit 190 corrects the common condition according to each generator so that the generated power output from the generator for which the minimum value is set is equal to or more than the minimum value. In the present example, the correction unit 190 corrects the common restriction ratio. The correction unit 190 adds the offset amount based on the minimum value to the common condition so that the generated power output by the generator for which the minimum value is set is equal to or more than the minimum value, and generates the common condition for each power generation. Correct according to the machine. The correction unit 190 adds the offset amount, which is the minimum value for each generator, to the common limit ratio.

  In this example, the correction unit 190 may include an offset addition unit 192 and an offset addition unit 194. The number of offset adders may be determined according to the number of generators for which the minimum value is set. The offset addition unit 192 divides the minimum value of the generated power of the generator 20-1 by the rated power value to calculate the minimum value of the restriction ratio. The minimum value of the generated power in the generator 20-1 may be different from or the same as the minimum value of the generated power of the other generators 20-2. The offset addition unit 192 adds the minimum value of the limit ratio corresponding to the minimum value of the generated power of the generator 20-1 as the offset amount to the common limit ratio in advance. Similarly, the offset addition unit 194 adds the minimum value of the limit ratio corresponding to the minimum value of the generated power of the generator 20-2 as the offset amount to the common limit ratio in advance.

  The control unit 130 acquires each restriction ratio to which the offset amount is added. The control unit 130 controls each generator to limit the sum value to a threshold value or less based on each restriction ratio to which the offset amount is added. In the case where each generator is controlled using the condition in which the common condition is corrected as described above, the case is also included in the case where the respective generator is controlled based on the common condition and the combined value is limited to the threshold or less. You may The control unit 130 may multiply the corrected limit ratio by the rated power value of each generator and transmit the limit value (MW) as a control signal (control signal) to the output control mechanism of the generator.

  According to such a power generation control system 100, it is possible to prevent, in particular, that the generated power output from each of the wind power generators 20 is suppressed to a value smaller than the minimum value. Therefore, since it is not necessary to stop the generator and change the number of generators to be driven, it is possible to prevent the output of the generated power from being temporarily reduced until the stop, the number change, etc. are completed. In addition, disturbance to the power system can be prevented.

  In addition, in the electric power generation control system 100 shown by FIG. 16, although the case where a restriction | limiting ratio was calculated on the basis of a rated power value was demonstrated common conditions, it is not restricted to this case. The common condition may be a limit value or a limit ratio based on the pre-limit output power value. The common condition may be a power loss value, a value obtained by dividing the power loss value by the rated power value of each generator, or a value obtained by dividing the power loss value by the unrestricted output power value of each generator. The common condition may be a loss amount, a value obtained by dividing the loss amount by the rated power value of each generator, or a value obtained by dividing the loss amount by the pre-limit output power value of each generator.

  FIG. 17 shows another example of the correction unit 190. The power generation control system 100 including the correction unit 190 of this example may have the same structure as the power generation control system 100 shown in FIG. 16 except for the correction unit 190. The correction unit 190 in FIG. 17 distributes the limit value corresponding to the lower limit ratio to the other generators when there is a generator whose limit ratio% is lower than the minimum output.

  The correction unit 190 includes a minimum value condition determination unit 197, a difference calculation unit 198, and an adjustment unit 199. The minimum value condition determination unit 197 determines whether or not the generated power output by the generator for which the minimum value is set is less than the minimum value when the respective generators are controlled under the common condition. In this example, the restriction ratio based on the rated power value may be a common condition. When there is a generator whose generated power is less than the minimum value, the difference calculation unit 198 calculates a difference (kW) between the minimum value and the limit value. When there are a plurality of generators whose generated power is less than the minimum value, the difference (kW) between the minimum value and the limit value is calculated in each generator, and all differences (kW) are summed. The unit may be MW.

  The adjustment unit 199 adjusts the limit value of the generator at which the generated power is less than the minimum value. Moreover, the adjustment part 199 adjusts the limit value about generators other than a generator in which generated electric power becomes less than the minimum value about the difference (kW) of the minimum value and the limit value.

  FIG. 18 is a flowchart showing an example of the limiting ratio correction process. The minimum value condition determination unit 197 determines whether there is a generator whose generated power output by the generator for which the minimum value is set is less than the minimum value when the respective generators are controlled according to the common condition. . If there is such a generator (step S201: YES), the difference calculation unit 198 calculates the difference (kW) between the minimum value and the limit value (step S202). When there are a plurality of generators whose generated power is less than the minimum value, the difference (kW) between the minimum value and the limit value is calculated in each generator, and all differences (kW) are summed.

  The adjustment unit 199 adjusts the restriction ratio according to each generator so as to distribute the difference (kW) calculated in step S202 to the other generators (step S203). The adjustment unit 199, for example, for the generator whose generated power output by the generator whose minimum value is set at step S202 is less than the minimum value, becomes generated power larger by the predetermined value than the minimum value or the minimum value. Let's do it. Then, the method described in FIG. 3, FIG. 9, FIG. 11, and FIG. 13 is applied again to the generators except for the generator whose generated power has become less than the minimum value to calculate common conditions. You may The common condition may be a loss power value, a value obtained by dividing the loss power value by the rated power value of each generator, or a value obtained by dividing the loss power value by the unrestricted output power value of each generator. . The common condition may be a loss amount, a value obtained by dividing the loss amount by the rated power value of each generator, or a value obtained by dividing the loss amount by the pre-limit output power value of each generator.

  According to such a power generation control system 100, it can be prevented in advance that the generated power output from each wind power generator 20 is suppressed to a value less than the minimum value.

  In the power generation control system 100 of the first embodiment described with reference to FIGS. 1 to 18, the condition calculation unit 120 increases the limit value or the like according to the results of the first comparator 116 and the second comparator 117. By constructing the feedback by reducing, the appropriate limit values etc were calculated. However, the condition calculation unit 120 is not limited to the case where feedback is configured, and the limit value of the generated power, the limit ratio obtained by dividing the limit value by the rated power value of each generator, and the limit value are limited for each generator. Limit ratio divided by pre-output power value, loss power value, value of loss power value divided by rated power value of each generator, loss power value divided by output power value of each generator before limit, loss amount A value obtained by dividing the loss amount by the rated power value of each generator, or a value obtained by dividing the loss amount by the unrestricted output power value of each generator may be calculated.

Second Embodiment
FIG. 19 shows an example of a power generation system 7 having a power generation control system 200 of the second embodiment. In FIG. 19, the power generation system 7 includes a first type generator 300 and a second type generator 400 as a plurality of types of generators. The first type generator 300 is a generator that generates electric power without passing through a mechanical drive unit. The second type generator 400 is a generator that generates electric power by a mechanical drive unit. The first type generator 300 is, for example, a solar power generator. The second type generator 400 is, for example, a wind power generator, a hydroelectric generator, or a thermal power generator.

  The output end of the first generator 300 and the output end of the second generator 400 may be electrically connected to the interconnection point 30 by the transmission line 18 and the transmission line 24. As the plurality of types of generators, the generated power output by the first type generator 300 and the generated power output by the second type generator 400 are summed at the interconnection point 30.

  A transformer 36 may be provided between the first type generator 300 and the interconnection point 30, and a transformer 37 may be provided between the interconnection point 30 and the power generation control system 200. A power meter 31 may be provided to measure the power of the combined value of the generated power output by the plurality of types of generators.

  The power generation system 7 includes a first control unit 310. The first control unit 310 is electrically connected to the first type generator 300 to control the generated power output by the first type generator 300. Further, the power generation system 7 includes a second control unit 410. The second control unit 410 is connected to the second type generator 400 to control the generated power output by the second type generator 400. When the first type generator 300 is the solar power generator 10, the first control unit 310 may be a power conditioner for solar power generation. The power conditioner may include an inverter device and an output control unit. When the first control unit 310 is a power conditioner, the first type generator 300 may be electrically connected to the interconnection point 30 via the inverter device in the first control unit 310.

  When the type 2 generator 400 is a wind power generator, the second control unit 410 may be a wind power generation control unit. The second generator 400 comprises a mechanical drive unit 402 and a mechanical power limiting mechanism 404. The mechanical drive unit 402 is used for power generation. The mechanical power limiting mechanism 404 is a mechanical part used for power limitation of the second generator 400.

  FIG. 20 shows a schematic configuration of the wind power generator 20. The wind power generator 20 is an example of the second type generator 400. The wind power generator 20 may comprise a blade 406 and a blade angle control mechanism 407. The blade 406 is a blade of a wind turbine. The blade 406 is an example of the mechanical drive unit 402 of FIG. The blade angle control mechanism 407 is an actuator or the like for adjusting the angle of the blade 406. The blade angle control mechanism 407 is controlled by the second control unit 410. In one example, the second control unit 410 controls the generated power of the wind power generator 20 by pitch control control that adjusts the angle of the blades of the wind turbine via the blade angle control mechanism 407.

  In FIG. 19, the power generation control system 200 may include a determination unit 210, a control unit 230, and a storage unit 240. The determination unit 210 acquires a total value of generated power output by a plurality of types of generators. In one example, the determination unit 210 may obtain the sum value from the power meter 31. The determination unit 210 determines whether the sum value exceeds a predetermined threshold. The threshold may be set to less than the interconnection capacity. For example, the threshold is set in the range of 90% to 98% of the interconnection capacity.

  The control unit 230 may control the first type generator by transmitting a first control signal to the first control unit. The control unit 230 may control the second type generator by transmitting a second control signal to the second control unit. The control unit 230 controls each of the plurality of types of generators under the condition that the variation of the generated power is suppressed more than that of other types of generators, thereby controlling the total value as a threshold value. Restrict to the following. Among a plurality of types of generators, the number of times of output limitation is made smaller than that of other types of generators, and the time change rate of the generated power at the time of output limitation is made short and short.

  The particular type of generator may be a type 2 generator 400 with a mechanical drive 402. In this case, the control unit 230 sets each of the first type generator 300 and the first The two-type generator 400 is controlled to control the total value of the generated power at the interconnection point 30 below the threshold. The control unit 230 may make the number of times of limiting the generated power of the second type generator 400 smaller than the number of times of limiting the generated power of the first type generator 300. The control unit 230 may set the time for limiting the generated power of the second generator 400 shorter than the time for limiting the generated power of the first generator. The control unit 230 may make the change of the generated power when limiting the generated power of the second type generator 400 more gradual than the change of the generated power when limiting the generated power of the first type generator 300.

  By setting the limiting ratio based on the rated power value in the second type generator 400 higher than the limiting ratio based on the rated power value in the first type generator 300, the output limitation in the second type generator 400 can be a first type generator It may be smaller than the output limit at 300. The limit ratio is a value obtained by dividing the limit value of the generated power output by each generator by the rated power value of each generator.

  In the second type generator 400, the restriction ratio based on the rated power value is made higher than the restriction ratio based on the rated power value in the first type generator 300, and the output restriction in the second type generator 400 is in the first type generator 300 It may be smaller than the output limit. The limit ratio is a value obtained by dividing the limit value of the generated power output by each generator by the rated power value of each generator. In the second type generator 400, the limit ratio based on the pre-limit output power value is made higher than the limit ratio based on the pre-limit output power value in the first type generator 300, and It may be smaller than the output limitation in the seed generator 300.

  The power loss value (loss) due to the output restriction in the second type generator 400 is made smaller than the loss power value due to the output restriction in the first type generator 300, and the output restriction in the second type generator 400 is a first type generator It may be smaller than the output limit at 300.

  FIG. 21 is a flowchart illustrating an example of processing in the power generation control system 200 according to the second embodiment. It is determined whether the total value of the generated power output by the plurality of types of generators exceeds a predetermined threshold (step S301). When the combined value exceeds the threshold (step S301: YES), the control unit 230 selects a specific type of generator among the plurality of types of generators (step S302), and outputs power to the specific type of generator. The number of times of restriction (time) is made smaller than the number of times (time) of power output restriction for other types of generators (step S303). In this example, a second-type generator 400 may be selected as a specific type of generator. When the total value is equal to or less than the threshold (step S301: NO), the control unit 230 does not particularly execute the process of output restriction of the generated power of the generator.

  The control unit 230 transmits a control signal to each generator. The control unit 230 transmits a control signal to the first control unit 310 (step S304), and transmits a control signal to the second control unit 410 (step S304).

  As described above, the control unit 230 sets each of the first-type generators 300 under the condition that the variation of the generated power of the second-class generator 400 is suppressed more than the variation of the generated power of the first-class generators 300. And control the second type generator 400 to limit the sum to a threshold or less. Therefore, it does not have a mechanical drive and does not have a mechanical drive, and the maintenance cost increases due to the output restriction rather than the type 2 generator 400 that has a mechanical drive and is likely to cause an increase in maintenance cost due to the output restriction. Since priority is given to the output limitation of the first type generator 300 which is less likely to occur, it is possible to prevent an increase in the maintenance cost of the second type generator.

  As mentioned above, although 2nd Embodiment of this invention was described, the technical scope of this invention is not limited to the range as described in the said embodiment.

  FIG. 22 shows an example of the configuration of a computer 2200 according to the present embodiment. FIG. 22 shows an example of a computer 2200 in which aspects of the invention may be fully or partially embodied. A program installed in the computer 2200 can cause the computer 2200 to function as an operation or one or more sections of the device according to an embodiment of the present invention, or the operation or the one or more operations. Sections may be performed and / or computer 2200 may be performed processes according to embodiments of the present invention or steps of such processes. Such programs may be executed by CPU 2212 to cause computer 2200 to perform specific operations associated with some or all of the blocks in the flowcharts and block diagrams described herein.

  The computer 2200 according to the present embodiment includes a CPU 2212, a RAM 2214, a graphic controller 2216 and a display device 2218, which are mutually connected by a host controller 2210. Computer 2200 also includes communication interface 2222, hard disk drive 2224, DVD-ROM drive 2226, and input / output units such as an IC card drive, which are connected to host controller 2210 via input / output controller 2220. There is. The computer also includes legacy input / output units such as ROM 2230 and keyboard 2242, which are connected to input / output controller 2220 via input / output chip 2240.

  The CPU 2212 operates in accordance with programs stored in the ROM 2230 and the RAM 2214, thereby controlling each unit. The graphic controller 2216 obtains image data generated by the CPU 2212 in a frame buffer or the like provided in the RAM 2214 or itself and causes the image data to be displayed on the display device 2218.

  The communication interface 2222 communicates with other electronic devices via a network. The hard disk drive 2224 stores programs and data used by the CPU 2212 in the computer 2200. The DVD-ROM drive 2226 reads a program or data from the DVD-ROM 2201 and provides the hard disk drive 2224 with the program or data via the RAM 2214. The IC card drive reads programs and data from the IC card and / or writes programs and data to the IC card.

  The ROM 2230 stores therein a boot program or the like executed by the computer 2200 upon activation and / or a program dependent on the hardware of the computer 2200. The I / O chip 2240 may also connect various I / O units to the I / O controller 2220 via parallel ports, serial ports, keyboard ports, mouse ports, etc.

  The program is provided by a computer readable medium such as a DVD-ROM 2201 or an IC card. The program is read from a computer readable medium, installed on a hard disk drive 2224, a RAM 2214 or a ROM 2230 which is also an example of a computer readable medium, and executed by the CPU 2212. Information processing described in these programs is read by the computer 2200 and brings about coordination between the programs and the various types of hardware resources. An apparatus or method may be configured by implementing the manipulation or processing of information in accordance with the use of computer 2200.

  For example, when communication is executed between the computer 2200 and an external device, the CPU 2212 executes the communication program loaded in the RAM 2214, and performs communication processing to the communication interface 2222 based on the processing described in the communication program. You may order. The communication interface 2222 reads transmission data stored in a transmission buffer processing area provided in a recording medium such as the RAM 2214, the hard disk drive 2224, the DVD-ROM 2201, or an IC card under the control of the CPU 2212 and reads the transmission The data is transmitted to the network, or the received data received from the network is written to a reception buffer processing area or the like provided on the recording medium.

  In addition, the CPU 2212 causes the RAM 2214 to read all or necessary portions of files or databases stored in an external recording medium such as the hard disk drive 2224, the DVD-ROM drive 2226 (DVD-ROM 2201), an IC card, etc. Various types of processing may be performed on the data on RAM 2214. Next, the CPU 2212 writes back the processed data to the external recording medium.

  Various types of information, such as various types of programs, data, tables, and databases may be stored on the recording medium and received information processing. The CPU 2212 describes various types of operations, information processing, condition judgment, conditional branching, unconditional branching, information retrieval, which are described throughout the present disclosure and specified by a program instruction sequence for data read from the RAM 2214. Various types of processing may be performed, including / replacement etc., and the results are written back to RAM 2214. In addition, the CPU 2212 may search for information in a file in a recording medium, a database, and the like. For example, when a plurality of entries each having the attribute value of the first attribute associated with the attribute value of the second attribute are stored in the recording medium, the CPU 2212 specifies the attribute value of the first attribute. Search for an entry matching the condition from among the plurality of entries, read the attribute value of the second attribute stored in the entry, and thereby associate the first attribute satisfying the predetermined condition with the first attribute An attribute value of the second attribute may be acquired.

  The programs or software modules described above may be stored on computer readable medium on or near computer 2200. Also, a recording medium such as a hard disk or a RAM provided in a server system connected to a dedicated communication network or the Internet can be used as a computer readable medium, thereby providing the program to the computer 2200 via the network. Do.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It is apparent to those skilled in the art that various changes or modifications can be added to the above embodiment. It is also apparent from the scope of the claims that the embodiments added with such alterations or improvements can be included in the technical scope of the present invention.

  The execution order of each process such as operations, procedures, steps, and steps in the apparatuses, systems, programs, and methods shown in the claims, the specification, and the drawings is particularly “before”, “preceding” It is to be noted that “it is not explicitly stated as“ etc. ”and can be realized in any order as long as the output of the previous process is not used in the later process. With regard to the flow of operations in the claims, the specification and the drawings, even if it is described using “first,” “next,” etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

2 · · Power generation system, 4 · · Substation, 6 · · Commercial power system, 7 · · Power generation system, 10 · · Photovoltaic generator, 12 · Power conditioner, 14 · Inverter device, 16 · · · Output control Section 18 Transmission line 20 Wind power generator 22 Wind power generation control unit 24 Transmission line 30 Connection point 31 Electric power meter 32 Electric power meter 34 Power meter 36 Transformer 37 Transformer 42 Hydroelectric generator 43 Thermal power generator 100 Power generation control system 110 Judgment unit 111 Difference unit 112 · · First limiter, 113 · · Second limiter, 114 · · First integrator, 115 · · Second integrator, 116 · · First comparator, 117 · · Second comparator, 119 · Addition unit , 120 · · · condition calculation unit, 121 · · restriction ratio subtraction unit, 122 · · restriction ratio Adder unit 123 Condition output unit 130 Control unit 140 Storage unit 142 First storage unit 144 Second storage unit 151 Limit value subtraction unit 152 Limitation Value addition unit, 160 · · · Pre-limit power value acquisition unit, 161 · · · Restriction ratio subtraction unit, 162 · · · Restriction ratio addition unit, 171 · · · Loss power value addition unit, 172 · · · Loss power value subtraction unit, 181 · · · · loss amount adding unit, 182 ... loss amount subtraction unit, 190 ... correction unit, 192 ... offset addition unit, 194 ... offset addition unit, 197 ... minimum value condition determining unit, 198 ... difference calculating unit, 199 · · adjustment unit, 200 · · power generation control system, 210 · · determination unit 230 · · · control unit 240 · · storage unit 300 · · · Class 1 generator 310 · · first control unit 400 · · · · Type 2 generator, 402 · · · Mechanical drive unit 404 · · · mechanical power limiting mechanism, 406 · · · · · · · · · · · · blade angle control mechanism, 410 · · second control unit, 2200 · · computer, 2201 · · · DVD-ROM, 2210 · · host controller, 2212 · · · CPU 2214 RAM 2216 Graphic controller 2218 Display device 2220 I / O controller 2222 Communication interface 2224 Hard disk drive 2226 DVD-ROM drive 2230 · ROM, 2240 · · I / O chip, 2242 · · Keyboard

Claims (12)

A determination unit that determines whether a total value of generated power output by each of a plurality of generators including different types of generators connected to one interconnection point exceeds a predetermined threshold value;
When the total value exceeds the threshold value, a limit value of generated power output by each of the plurality of generators, a value obtained by dividing the limit value by the rated power value of each generator, or the limit value A condition calculation unit that calculates a value obtained by dividing the output power value before limitation of the generator as a value common to each of the plurality of generators;
Output from each of the plurality of generators according to the limit value, a value obtained by dividing the limit value by the rated power value of each generator, or a value obtained by dividing the limit value by the unrestricted output power value of each generator A control unit that limits the generated power to limit the sum value to the threshold value or less;
Power generation control system comprising: The plurality of generators include at least one wind power generator and a plurality of solar power generators,
The condition calculation unit may set the limit value, a value obtained by dividing the limit value by the rated power value of each generator, or a value obtained by dividing the limit value by the output power value before limitation of each generator, a plurality of sunlights. Calculated as a value common to each generator of the generator and the wind power generator
The power generation control system according to claim 1. If the total value exceeds the threshold value, the condition calculation unit may calculate the limit value, the limit value divided by the rated power value of each generator, or both of the generators of different types. The limit value for limiting the combined value to the threshold value or less by reducing both the limit value divided by the output power value before limit of each generator is reduced, the limit value is the rated power of each generator The power generation control according to claim 1 or 2, wherein a value obtained by dividing the value by a value or a value obtained by dividing the limit value by the output power value before limitation of each generator is calculated as a value common to each of the plurality of generators. system. A determination unit that determines whether a total value of generated power output by each of a plurality of generators including different types of generators connected to one interconnection point exceeds a predetermined threshold value;
A power loss value generated by limiting the generated power output by each of the plurality of generators when the total value exceeds the threshold value, a value obtained by dividing the power loss value by the rated power value of each generator Or a condition calculation unit that calculates a value obtained by dividing the loss power value by the output power value before limitation of each generator as a value common to each of the plurality of generators;
From each of a plurality of generators according to the loss power value, a value obtained by dividing the loss power value by the rated power value of each generator, or a value obtained by dividing the loss power value by the unrestricted output power value of each generator A control unit that limits the generated power to be output and limits the sum value to the threshold value or less;
Power generation control system comprising: The plurality of generators include at least one wind power generator and a plurality of solar power generators,
The condition calculation unit may calculate the loss power value, a value obtained by dividing the loss power value by the rated power value of each generator, or a value obtained by dividing the loss power value by the unrestricted output power value of each generator. Calculated as common values for each of the solar power generators and the wind power generator,
The power generation control system according to claim 4. When the total value exceeds the threshold value, the condition calculation unit divides the loss power value and the loss power value by the rated power value of each generator for both different types of generators. Alternatively, the loss power value and the loss power value are each increased to limit the total value to the threshold value or less by increasing both the value obtained by dividing the loss power value by the output power value before limitation of each generator. A value obtained by dividing the rated power value of the generator or the value obtained by dividing the loss power value by the output power value before limitation of each generator is calculated as a value common to each of the plurality of generators. The power generation control system according to 5. The minimum value of the generated power to be output by the generator when driving the generator is set to at least a part of the plurality of generators.
A correction unit that corrects the common value calculated by the condition calculation unit according to each generator such that the generated power output from the generator for which the minimum value is set is equal to or more than the minimum value Further comprising
The power generation control system according to any one of claims 1 to 6. The correction unit adds an offset amount based on the minimum value to the common value such that generated power output from the generator for which the minimum value is set is equal to or more than the minimum value.
The power generation control system according to claim 7. The correction unit determines whether the generated power output by the generator for which the minimum value is set is less than the minimum value when each of the plurality of generators is controlled by the common value. And
When the generated power output from the generator for which the minimum value is set is less than the minimum value, the correction unit is configured to output the generated power output from the generator for which the minimum value is set. Correct the common value so that it is greater than or equal to the minimum value,
The control unit applies the corrected previous common value to each generator to limit the summed value to the threshold value or less.
The power generation control system according to claim 7. The plurality of generators include wind power generators,
The minimum value of the generated electric power which the wind power generator should output in the case of driving the wind power generator is set to at least a part of the wind power generator according to any one of claims 7 to 9. Power generation control system. On the computer
Determining whether or not a total value of generated power output by each of a plurality of generators including different types of generators connected to one interconnection point exceeds a predetermined threshold value;
When the total value exceeds the threshold value, a limit value of generated power output by each of the plurality of generators, a value obtained by dividing the limit value by the rated power value of each generator, or the limit value Calculating a value obtained by dividing the output power value before limitation of the generator as a value common to each of the plurality of generators;
Output from each of the plurality of generators according to the limit value, a value obtained by dividing the limit value by the rated power value of each generator, or a value obtained by dividing the limit value by the unrestricted output power value of each generator A step of transmitting a control signal for limiting the generated power to limit the sum to the threshold value or less;
Control program to execute On the computer
Determining whether or not a total value of generated power output by each of a plurality of generators including different types of generators connected to one interconnection point exceeds a predetermined threshold value;
A power loss value generated by limiting the generated power output by each of the plurality of generators when the total value exceeds the threshold value, a value obtained by dividing the power loss value by the rated power value of each generator Or a procedure of calculating a value obtained by dividing the loss power value by the output power value before limitation of each generator as a value common to each of the plurality of generators;
From each of a plurality of generators according to the loss power value, a value obtained by dividing the loss power value by the rated power value of each generator, or a value obtained by dividing the loss power value by the unrestricted output power value of each generator A step of transmitting a control signal for limiting the generated power to be output and limiting the sum to the threshold value or less;
Control program to execute

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