Power generation control program, control terminal for executing the same, and power generation control system

Abstract

To provide a control device of a power generation system capable of coping with output control and not performing excessive control at low cost.SOLUTION: A power generation control program for transmitting an output switching command, the power generation control program comprising: an upper limit value determination step of determining an upper limit value of a total generated power of a plurality of power generation control devices when output control information is acquired; an output power prediction step of predicting an actual output power of the power generation control device in a time period of output control; and an output control step of causing one of the plurality of power generation control devices to switch between 100% output and stop so that an arithmetic mean output power in the time period of output control of the plurality of power generation control devices based on the prediction in the output control time period is equal to the upper limit value; A time table preparation step for preparing an output time table for setting 100% output or stop to the other power generation controllers, and a command transmission step for transmitting an output command for executing the output time table only to a part of the power generation controllers are executed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power generation control program, a control terminal that executes the program, and a power generation control system. [Background technology]

[0002] The number of businesses that install solar power generation systems and sell the electricity they generate to electric power companies is increasing. In recent years, the frequency of output control due to supply-demand balance constraints has increased, and from fiscal year 2023, the scope of output control will be greatly expanded.

[0003] Output control is basically performed by controlling power generation control devices online. For example, in a solar power generation system that receives output control information from an electric utility, the power connected to the power grid is controlled to a specified value by suppressing the output of each power conditioner. However, in a solar power generation system with a power conditioner that does not have online control or output control functions, it is necessary to choose between installing a new compatible power conditioner, manually controlling the inverter by switching it on and off, or using the economic output control system, all of which involve significant economic burdens and losses. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-226120

[0005] Patent Document 1 discloses an operation control device that combines a power conditioner that outputs at 100% (rated) with a power conditioner that stops operation, thereby achieving output suppression for the entire photovoltaic power generation system.

[0006] With this technology, if the solar power generation system has a large number of power conditioners, it can control the output almost in accordance with the command value for output control. However, if the number of power conditioners is small, the output of the solar power generation system may be controlled significantly lower (excessively) than the command value. Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a control terminal and a program for the control terminal at low cost for a power generation system that can handle online output control and does not perform excessive control. [Means for solving the problem]

[0008] The power generation control program according to the present invention comprises: A power generation control program for transmitting an output switching command to each of a plurality of power generation control devices that switch power generation between 100% output and stop, When output control information including an output command value that sets an upper limit of the output of the plurality of power generation control devices and a time period during which the output command value is maintained is acquired, an upper limit value determination step of determining an upper limit value of the total power generation power of the plurality of power generation control devices during a time period of output control based on the upper limit of the output and the output power of each of the power generation control devices; a timetable creation step of creating an output timetable by the time period subject to output control, in which one of the plurality of power generation control devices is caused to output alternately between 100% output and stop within the time period subject to output control, and the other power generation control devices are caused to output 100% or stop, so that the arithmetic average output power of the plurality of power generation control devices within the time period subject to output control, calculated based on the output power, becomes equal to the upper limit value; a command sending step of sending an output command to execute the output timetable to only some of the power generation control devices.

[0009] Such a power generation control program can achieve the maximum possible power generation within the time period subject to output control by using a low-cost method of switching between 100% output and no output (0% output) using contact control, etc. The representation format of the timetable is not limited to a table, and any format that can store the output plan within the time period subject to output control will suffice.

[0010] The output command value may be a command for an upper limit output ratio to a rated output of the power generation control device.

[0011] The output power may be a rated output of the power generation control device, or a predicted output power that predicts an actual output power of the power generation control device during a time period of output control.

[0012] The output power predicting step may perform prediction using one or more of information about the current output power, weather, time, and past output power.

[0013] an output power acquisition step of acquiring an actual output power of the power generation control device at predetermined intervals during the time period subject to the output control; a power comparison step of determining whether or not a difference between an arithmetic mean value of actual output power in a time period of output control based on the actual output power acquired in the output power acquisition step and an arithmetic mean value of output power assumed in the output time table exceeds a threshold value; and a modified output time table creating step of creating a modified output time table in which the 100% output time and the stop time within the time period of output control of the plurality of power generation control devices are modified so that, when there is a difference exceeding the threshold value, the arithmetic mean value of the output power within the time period of output control, calculated on the assumption that the actual output power will continue until the end of the time period subject to the output control, becomes equal to the upper limit value; The command transmission step may be configured to transmit, instead of an output command for executing the output timetable, a modified output command for executing the modified output timetable to only some of the power generation control devices.

[0014] The step of creating a modified output time table may include creating a modified output time table for another one of the plurality of power generation control devices, which switches between 100% output and stoppage within a time period of output control.

[0015] In the timetable creation step, a timetable may be created in which the timing for transmitting the output command is the latest, and in the modified output timetable creation step, a timetable may be created in which the timing for transmitting the modified output command is the latest.

[0016] The one of the plurality of power generation control devices may be the power generation control device with the smallest output among the plurality of power generation control devices.

[0017] The one of the plurality of power generation control devices may be the power generation control device that switches between 100% output and stop the least number of times among the plurality of power generation control devices.

[0018] A power generation control device according to the present invention is a power generation control device that executes the above-described power generation control program, and a power generation control system according to the present invention is characterized by being a power generation control system including the above-described power generation control device. [Effects of the Invention]

[0019] It is possible to output in response to output control, and power generation control that can generate maximum power can be realized at low cost. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a block diagram of a power generation control system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a flowchart showing the operation of the power generation control program according to the embodiment of the present invention. [Figure 3] FIG. 3 is a flowchart showing the operation of a power generation control program according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the following embodiments are not intended to limit the scope of the present invention. Furthermore, the same or similar components will be designated by the same reference numerals, and their description may be omitted.

[0022] FIG. 1 is a block diagram of a power generation control system 100 according to one embodiment of the present invention. The power generation control system 100 includes solar cells 11-15, PCSs (power conditioners, power generation control devices) 21-25, and a timetable creation device (control terminal) 5. The power generation control system 100 according to the present invention reverse-flows all of the AC power output from the PCSs 21-25 to the power grid, and is connected to a commercial power line (not shown) of an electric power company or the like. In this embodiment, the power generation control system 100 includes five solar cells 11-15 and five PCSs 21-25. The power generation control system 100 may further include a storage battery (not shown) and an output power measurement device 8 that measures the actual output power, or each PCS itself may be configured to be able to measure the actual output instead of the output power measurement device 8.

[0023] Solar cells 11-15 convert sunlight into DC power and output it to PCSs 21-25, which are electrically connected to them. PCSs 21-25 convert the DC power output from solar cells 11-15 into AC power and provide a reverse power flow to the power grid. Each of PCSs 21-25 is configured to be able to switch between 100% output (rated output) and 0% output (operation stopped) by contact control, but does not have an output control function to control the output to a desired value (for example, xx% of the rated output). The rated outputs of the PCSs may all be the same, or some or all of them may be different.

[0024] The timetable creation device 5 is connected to, for example, the server of an electric utility company, and is configured to be able to receive output control information (output control schedule) from the server. The timetable creation device 5 creates an output timetable for each of the PCSs 21 to 25 based on the output control information. Then, it transmits an output command to the required PCS to execute the output timetable.

[0025] The output power measuring device 8 measures the actual output power of the PCS, and may be provided independently for each PCS, or may measure the output power of multiple PCSs. The actual output power of the PCS may be measured directly or indirectly by the PCS itself. The output power may be measured continuously or at regular intervals.

[0026] The timetable creation device 5 includes a communication device that, for example, sends commands to the PCS, receives information from the server, receives output information from the output power measurement device 8 and the PCS, and so on.

[0027] Furthermore, the device may be provided with a storage device that stores output control information, an output timetable, and output commands, and a control device that calculates upper limits, predicts actual output power, creates timetables, transmits commands, etc. However, this is just one example of the configuration of the timetable creation device 5, and the same or similar functions may be realized by other elements or configurations, and multiple functions may be realized by one element or configuration, or one function may be realized by one or multiple elements or configurations, and these are also included in the scope of the present invention.

[0028] The flow of processing according to the present invention will be described with reference to Fig. 2. Fig. 2 is a flowchart showing the operation of a power generation control program according to an embodiment of the present invention.

[0029] (start) When the timetable creation device 5 receives output control information transmitted from the electric utility's server, subsequent processing begins. The output control information includes, for example, an output control command value that sets the power generation upper limit ratio relative to the rated output of the PCS, and information on the time period during which the output command value is maintained. These time periods are set in 30-minute increments, but processing is also possible for other time periods. When output control command values ​​for multiple time periods are received at the same time, processing for the multiple time periods may be performed simultaneously in parallel, sequentially, or for some of the multiple time periods at once.

[0030] (Upper limit determination step S101) The timetable creation device 5 calculates and determines the upper limit value of the total power generation of multiple power generation control devices during the output control time period from the power generation upper limit ratio included in the output control information and the rated output of the power generation control devices. Note that if the output control information includes the upper limit value (kW) of the output of the power generation control devices instead of the power generation upper limit ratio (%), in upper limit value determination step S102, the total value of the upper limit values ​​of the output included in the output control information is determined as the upper limit value to be used in subsequent timetable creation.

[0031] (Timetable creation step S102) The timetable creation device 5 creates an output timetable by the time slot of output control so that the arithmetic mean output power of the entire power generation control system 100 during the time slot of output control is equal to the upper limit of the total power generation power determined in the upper limit value determination step. This output timetable causes one of the multiple power generation control devices to output power so as to switch between 100% output and stop during the time slot of output control, and causes the other power generation control devices to maintain the 100% output or stop state during the time slot of output control.

[0032] (Waiting step S103) The system waits until an output command is required.

[0033] (Command sending step S104) When the time has come when an output command is required, the timetable creation device 5 transmits the output command to the required PCS. The output command may be created at any time between the end of the timetable creation step S102 and before the start of the command transmission step S105.

[0034] When the PCS receives the output command, the contacts are switched to switch the output from 100% output to stopped operation or from stopped operation to 100% output.

[0035] (Command confirmation step S105) After the command transmission step S104, a command confirmation step S105 is performed. For example, if there is a change in the output of the PCS at the beginning of the output control time period and one PCS is switched during the output control time period, there will be two output commands. In such a case, a waiting step S103 is performed until the remaining output command is sent.

[0036] This series of processes enables simple control that allows for maximum output while still complying with output control from the electric utility company.

[0037] Next, a process for changing the output timetable based on the actual output will be described with reference to Fig. 3. Fig. 3 is a flowchart showing the operation of a power generation control program according to another embodiment of the present invention. Step S201 in Fig. 3 is similar to step S101 in Fig. 2, step S203 in Fig. 3 is similar to step S102 in Fig. 2, step S205 in Fig. 3 is similar to step S103 in Fig. 2, and step S206 in Fig. 3 is similar to step S104 in Fig. 2, and therefore their description will not be repeated.

[0038] (Output power prediction step S202) The timetable creation device 5 predicts that the current actual output obtained from, for example, the output power measurement device 8 or the PCS will be the output during the time period when output control is performed. This predicted output is used in the timetable creation step S203. Note that this prediction method is an example and is not limited to this. Furthermore, the order of the output power prediction step S202 and the upper limit value determination step S201 is not particularly limited, and they may be performed simultaneously.

[0039] (Time zone confirmation step S204) The timetable creation device 5 checks whether or not the time falls within the time period targeted by the timetable creation step S203 of this case. Whether or not the time falls within the time period is determined by, for example, whether or not the timing for sending an output command that should be sent (executed) at the same time as the start of the time period targeted by the output timetable exists, or whether or not the time falls within the time period if there is no output command that should be sent at the same time as the start of this time period.

[0040] (Output power acquisition step S207) If there is no output command to be sent in command confirmation step S205, or after sending an output command to be sent at the beginning of the time period covered by the output timetable (S206), the output power measuring device 8 or PCS starts acquiring the actual output power of the PCS that is outputting 100% during the time period in which output control is being performed at a predetermined interval, and sends it to the timetable creation device 5. The predetermined interval can be set as appropriate.

[0041] (Power comparison step S208) The timetable creation device 5 compares the arithmetic mean value of the actual output power during the time period of output control, based on the actual output power acquired in the output power acquisition step, with the arithmetic mean value of the output power assumed in the output timetable, and determines whether there is a difference exceeding the threshold. If there is no difference, the process returns to the output power acquisition step S206 to continue monitoring the actual output power, and if there is a difference, the process proceeds to the modified output timetable creation step S209.

[0042] (Step S209: Creating a modified output timetable) If there is a difference exceeding the threshold, the timetable creation device 5 creates a modified output timetable creation step that creates a modified output timetable by modifying the 100% output times and stop times within the output control time period of the multiple power generation control devices so that the arithmetic mean value of the output power within the output control time period, calculated assuming that the actual output power will continue until the end of the time period subject to output control, is equal to the upper limit value. In this case, if a modified output timetable is used that performs switching as late as possible, the number of times modified output commands are issued can be reduced, thereby reducing the number of switching times. Similarly, if an output timetable is used that performs switching as late as possible, the number of times modified output commands are issued can be reduced, thereby reducing the number of switching times. After this, the process returns to the output power acquisition step S206 to continue monitoring the actual output power.

[0043] The output command may be generated at any timing between the end of the timetable generation step S203 and before the start of the command transmission step S206, or between the end of the modified output timetable generation step S209 and before the start of the command transmission step S206.

[0044] These steps S205 to S209 are repeated, and a new modified output timetable and a modified output command based on it are created, while the old output timetable and the output command based on it that are no longer needed are discarded and no longer used. The modified output command is sent only to the required PCS at the required timing. Note that processing for this time period ends when the time period ends. Also, to allow for a smooth transition to processing for the next time period, the processing may end without performing any processing for a certain period at the end of the time period (for example, 1 minute, 30 seconds, etc.).

[0045] Since the actual output of solar cells fluctuates depending on the time of day, weather, panel temperature, etc., by being able to track the actual output, it is possible to obtain an actual output equal to the upper limit of the total power generation (allowing for maximum power sales).

[0046] Here, the threshold value used to determine whether the power is equal or not in the power comparison step S207 is not particularly limited and may be set as appropriate. The interval at which the power comparison step is performed is also not particularly limited and may be set as appropriate. The smaller the threshold value and the shorter the interval, the faster the system can respond to changes in actual output. The larger the threshold value and the longer the interval, the less frequently the modified output timetable needs to be created, and the fewer times the system switches between 100% output and off.

[0047] The threshold can be set appropriately from this perspective. For example, by making the threshold when the actual output power and the arithmetic mean value of the output power based on the output timetable are positive smaller than the threshold when the arithmetic mean value is negative, it is possible to prevent output that exceeds the output control while reducing the frequency of creating modified output timetables and reducing the number of times that output is switched between 100% and stopped.

[0048] Furthermore, for example, by setting the threshold and interval large in the early part of the time period when there is room to follow output fluctuations, and setting the threshold and interval small in the later part of the time period, it is possible to obtain output that appropriately complies with output control while reducing the number of times modified output timetables are created and the number of times PCSs are switched.

[0049] Hereinafter, a more detailed explanation will be given using specific numerical examples, but the numerical values ​​used here are merely examples and the present invention is not limited to these numerical values.

[0050] (Embodiment 1) First, an example will be described in which the rated outputs of PCS21 to 25 are all 10 kW and output control starts from the time period of 11:00 to 11:30 AM.

[0051] If a command value to reduce output to 30% is received during the time period from 11:00 to 11:30 a.m., the total rated output is 50 kW, so the timetable creation device 5 calculates the upper limit of the total power generation during this time period to be 15 kW (upper limit determination step S101).

[0052] Thereafter, the timetable creation device 5 creates a timetable of 100% output and stop of PCS25, with one PCS21 outputting 100% during this time period, three PCS22-24 stopped, and one PCS25 switching between 100% output and stop during this time period, and the output timetable shown in Table 1 below is created (timetable creation step S102). Any algorithm may be used for selecting the PCS, and non-limiting examples will be described later.

[0053] [Table 1]

[0054] Thereafter, the timetable creation device 5 transmits output commands for executing the output timetable shown in Table 2 below to only the necessary PCSs at the required timing (wait step S103, command transmission step S104). In Table 2, "-" means that there is no change in output and no output command has been sent, and "0%" means that a command has been sent to switch from 100% (rated) output to 0% output (stopped operation). Since the above output timetable requires that two output commands be sent, the remaining output commands are confirmed (command confirmation step S105) and sent to only the necessary PCSs at the required timing (wait step S103, command transmission step S104).

[0055] [Table 2]

[0056] In this way, by sending commands to only a selected portion of the PCSs, response performance can be improved. Note that in this embodiment, control is performed using an algorithm that minimizes the number of switching units, so instead of changing the PCS25 to 0% output at the beginning of the output control time period, the PCS25 is changed to 0% output in the latter half of the output control time period, but the reverse is also possible. However, since the more switching occurs within the output control time period, the greater the load on the PCS, so it is preferable to reduce the number of switching times.

[0057] For example, suppose that a command value to set the output at 25% is received for the following time period (11:30 AM to 12:00 PM). Since the total rated output is 50 kW, the timetable creation device 5 calculates the upper limit of the total power generation for this time period to be 12.5 kW (upper limit value determination step S101).

[0058] After this, the timetable creation device 5 creates an output timetable shown in Table 3 in the same manner as above, and sends the commands shown in Table 4 only to the necessary PCS (selected PCS) at the necessary timing (timetable creation step S102, waiting step S103, command sending step S104, command confirmation step S105 command confirmation step S105).

[0059] [Table 3]

[0060] [Table 4]

[0061] By repeating this process, the total generated power is controlled in accordance with the output control.

[0062] If the output control is 20%, only the PCS21 will output 100% and the other PCSs will remain stopped. In this case, the PCS operation will not be switched within the time period.

[0063] (Embodiment 2) For example, if the rated output of PCS21 to 24 is 10 kW and only PCS25 has a rated output of 5 kW, and output control of 15 kW and 12.5 kW is performed as in embodiment 1, the timetables shown in Tables 5 and 6 below are created.

[0064] [Table 5]

[0065] [Table 6]

[0066] (Embodiment 3) Next, an example of output control using predicted output that predicts actual output will be described. The output control ratio and time period are assumed to be the same as above (upper limit value determination step S201). Here, it is assumed that the output of PCS 21 to 25 just before 11:00 is all 8 kW, and that the same output will continue from 11:00 to 11:30 (output power prediction step S202). Then, the timetable creation device 5 creates the output timetable shown in Table 7 (timetable creation step S203).

[0067] [Table 7]

[0068] By doing this, the only PCS that is switched is PCS25, and the average value of the total output power can be controlled to 15 kW, which is 8 kW for PCS21 + (8 × 1575 ÷ 1800) kW for PCS25. The details of the output command are the same as above, so a description thereof will be omitted.

[0069] (Embodiment 4) Next, we will explain what happens when the actual output is different from the forecast due to weather changes, etc. In this embodiment, the threshold is, but is not limited to, the accumulated time during which the difference between the forecasted output when creating the output timetable and the actual output is 5% or more for 2 minutes or more.

[0070] First, an output command is created and transmitted so that output control will start at 11:00 a.m. (time zone confirmation step S204, command confirmation step S205, command transmission step S206). The timetable created initially is the same as Table 7 above, and the description will not be repeated.

[0071] However, assume that the outputs of both operating PCSs 21 and 25 dropped to 7.5 kW after 11:10 (output power acquisition step S207). As a result, at 11:12, the error of 6.25% (1 ÷ 16 × 100) continues for two minutes (power comparison step S208). At this point, the timetable creation device 5 creates a modified output timetable by changing the 100% output times and stop times within the output control timeframe of the multiple power generation control devices so that the arithmetic mean value of the output power calculated assuming that the actual output power will continue until the end of the timeframe subject to output control (11:30) is equal to the upper limit, as shown in Table 8 below (modified output timetable creation step S209). The modified output timetable is used in place of the output timetable before the change, and the previous output timetable is discarded. In this case, if an output command for executing the previous output timetable has already been generated, it is also discarded. Specifics of the modified output command are omitted here.

[0072] [Table 8]

[0073] This allows control that follows actual output changes. Also, even if it becomes necessary to change the timetable again, the number of PCS switching operations will not increase if the changed output timetable is created before issuing the output command before the change.

[0074] (Embodiment 5) Next, an example will be described in which the number of operating PCSs increases. The timetable initially created for the time period from 11:00 to 11:30 a.m. is the same as Table 5 above, and the description will not be repeated. Assume that the output of operating PCSs 21 and 25 both drops to 6 kW after 11:10. As a result, at 11:12, an error of 25% (4 ÷ 16 × 100) will continue for two minutes. At this point, the timetable creation device 5 creates a modified output timetable as shown in Table 9 below.

[0075] [Table 9]

[0076] After this, suppose that the outputs of PCSs 21 and 25 both increase to 8 kW after 11:20. In this case, the timetable creation device 5 creates a revised output timetable as shown in Table 10 below. In this case, the previously created revised output timetable is discarded without being used, and a revised output command based on the revised output timetable is sent only to PCS 24. Details of the revised output command will not be explained here. If the threshold value and the interval between output power acquisition steps are set to reduce the frequency of creating the revised output timetable, the revised output timetable of Table 10 can be created without creating the revised output timetable of Table 9.

[0077] [Table 10]

[0078] When creating (changing) a timetable, time divisions can be made in any unit, such as minutes, 30 seconds, 10 seconds, 1 second, or 0.1 seconds. Furthermore, to avoid output exceeding the output control limit, a timetable with a margin can be created by setting the upper limit to a value lower than the upper limit determined from the output control information. The margin value can be set as appropriate.

[0079] In the above embodiment, an example is shown in which the output of the PCS during the time period subject to output control is predicted and the PCS is switched between 100% output and stopped in response to changes in the actual output of the PCS. However, it is also possible to create an output timetable using rated output and switch the PCS between 100% output and stopped in response to changes in the actual output of the PCS.

[0080] Furthermore, in the output power prediction, an example has been described in which a constant output is maintained within a time period, but predictions may also be made assuming that the output of the PCS fluctuates within a time period.

[0081] The following describes a method for selecting a PCS to be switched, but these are merely examples and the present invention is not limited to this disclosure.

[0082] Algorithms for selecting PCS include random control, control that minimizes the number of switching times, control that makes operating hours uniform, and control that minimizes output fluctuations within a time period.Any of these may be selected, or two or more may be combined.

[0083] For example, if the PCS outputs are not all the same, the fluctuation range of the output value within the time period subject to output control can be reduced by switching the output of the unit with the lowest output in the output timetable created first.Also, in the output timetable created first, the PCS that maintains 100% output during the time period subject to output control can be selected from the PCS with the highest possible output.

[0084] In addition, if the PCS with the shortest output time is selected as the PCS that maintains 100% output during the time period subject to output control, the operating time of each PCS can be made uniform. Also, if the PCS with the least number of switching times is selected as the PCS that switches output during the time period subject to output control, the number of switching times for each PCS can be made uniform.

[0085] Furthermore, the output time table or the modified output time table can be created so as to minimize the number of times of switching or so as to delay the timing of transmitting the (modified) output command.

[0086] Additionally, PCSs may be prioritized based on the above criteria or other criteria, and a completely random PCS selection control may be employed.

[0087] By configuring a power generation control system using a control terminal that executes such a power generation control program, power generation corresponding to the output control as described above can be performed at low cost. [Industrial Applicability]

[0088] According to the present invention, output control can be achieved at low cost, and therefore the present invention has great industrial applicability. [Explanation of symbols]

[0089] 11~15 Solar cells 21~25 PCS 5 Timetable creation device 8. Output power measuring device 100 Power generation control system

Claims

1. A power generation control program for transmitting an output switching command to each of a plurality of power generation control devices that switch power generation between 100% output and stop, When output control information including an output command value that sets an upper limit of the output of the plurality of power generation control devices and a time period during which the output command value is maintained is acquired, an upper limit value determination step of determining an upper limit value of the total power generation power of the plurality of power generation control devices during a time period of output control based on the upper limit of the output and the output power of each of the power generation control devices; a timetable creation step of creating an output timetable by the time period subject to output control, in which one of the plurality of power generation control devices is caused to output alternately between 100% output and stop within the time period subject to output control, and the other power generation control devices are caused to output 100% or stop, so that the arithmetic average output power of the plurality of power generation control devices within the time period subject to output control, calculated based on the output power, becomes equal to the upper limit value; a command sending step of sending an output command to execute the output timetable to only some of the power generation control devices.

2. 2. The power generation control program according to claim 1, wherein the output command value is a command for an upper limit output ratio to a rated output of the power generation control device.

3. 2. The power generation control program according to claim 1, wherein the output power is a rated output of the power generation control device or a predicted output power obtained by predicting an actual output power of the power generation control device during a time period of output control.

4. 4. The power generation control program according to claim 3, wherein the output power prediction step makes a prediction using at least one of information about a current output power, weather, time, and past output power.

5. an output power acquisition step of acquiring an actual output power of the power generation control device at predetermined intervals during the time period subject to the output control; a power comparison step of determining whether or not a difference between an arithmetic mean value of actual output power in a time period of output control based on the actual output power acquired in the output power acquisition step and an arithmetic mean value of output power assumed in the output time table exceeds a threshold value; and a modified output time table creating step of creating a modified output time table in which the 100% output time and the stop time within the time period of output control of the plurality of power generation control devices are modified so that, when there is a difference exceeding the threshold value, the arithmetic mean value of the output power within the time period of output control, calculated on the assumption that the actual output power will continue until the end of the time period subject to the output control, becomes equal to the upper limit value, The power generation control program according to any one of claims 1 to 4, wherein the command sending step sends a modified output command to execute the modified output timetable to only some of the power generation control devices instead of the output command to execute the output timetable.

6. The power generation control program according to claim 5, wherein the modified output time table creation step creates a modified output time table for another one of the plurality of power generation control devices that switches between 100% output and stop within the output control time period.

7. In the timetable creation step, a timetable is created in which the timing of transmitting the output command is the latest, 6. The power generation control program according to claim 5, wherein the step of creating the modified output time table creates a time table that provides the latest timing for transmitting the modified output command.

8. 5. The power generation control program according to claim 1, wherein the one of the plurality of power generation control devices is a power generation control device with the smallest output among the plurality of power generation control devices.

9. 5. The power generation control program according to claim 1, wherein the one of the plurality of power generation control devices is the power generation control device that switches between 100% output and stoppage the fewest number of times among the plurality of power generation control devices.

10. A control terminal that executes the power generation control program according to any one of claims 1 to 4.

11. A power generation control system comprising the control terminal according to claim 10.

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