WO2017110276A1 - Electric power supply system, control device for electric power supply system, and program - Google Patents

Abstract

The present invention achieves an electric power supply system that can be inexpensively operated. The electric power supply system has: an electric power supply facility (5, 6) that is connected to a load facility (9) via an electric power system (2) and is capable of increasing/decreasing output power thereof on the basis of an external output command (P_BATT (t), P_EG (t)); and a control device (4). The control device (4) has: a system inertia-absorbed electric power calculation unit (416) for calculating system inertia-absorbed electric power (ΔP_I (t)) on the basis of system inertia (H) pertaining to the electric power system (2) such that the frequency variation range of the electric power system (2) falls within a predetermined range (±Δf_LIM); and a signal input/output unit (42) for sending a value obtained by subtracting the system inertia-absorbed electric power (ΔP_I (t)) from deficient/surplus electric power (P_DP (t)), that is, a deficiency or surplus of electric power in the electric power system (2), to the electric power supply facility (5, 6) as the output command (P_BATT (t), P_EG (t)).

Description

Power supply system, control device and program for power supply system

The present invention relates to a power supply system, a control device for the power supply system, and a program.

A power system installed in a limited area is called a “local system”, and an existing wide-area power system is called a “upper system”. The local system is linked to the upper system as necessary, and sells power to the upper system or purchases power from the upper system. As a background art of such a technical field, the abstract of Patent Document 1 states that “the electric power system 11 is a natural energy type power source 10 via a main bus 13 and an auxiliary bus 14 and a solar power generation facility 15. 16 is connected to the power load 17, and the total power of the power of the natural energy type power source 10 and the like is calculated by a total power calculation unit 19. The main bus 13 is a dispersion that performs load following operation via the auxiliary bus. As a type power source, it is connected to an electric power storage device 22 comprising an engine generator 21 and a secondary battery, and the deviation between the load power detection value and the connection point received power set value is reduced by a low-pass filter 27 and a low-frequency component and a high-frequency component. The engine generator 21 is controlled with a low frequency component and the power storage device 22 is controlled with a high frequency component ".

Also, on page 3 of Non-Patent Document 1, “Developing a method to estimate the ratio between the inertia constant of the entire system and the system capacity of the governor-free generator, and system frequency in 10 cases such as generator load interruption” As a result, the unit inertia constant of the system is approximately 14-18 seconds (system capacity standard), and the ratio of governor-free generator is the system capacity. Is estimated to be about 0.2 to 0.4.

JP 2006-333563 A

By the way, in the technique disclosed in Patent Document 1, when trying to maintain the power quality in the local system in an appropriate range, the frequency deviation which is the difference between the rated frequency (for example, 50 Hz and 60 Hz) and the actual frequency is used. Did not take into account. For this reason, there is a problem that the capacity required for the equipment is increased, and initial costs and maintenance costs are increased.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a power supply system that can be operated at a low cost, a control device for the power supply system, and a program.

In order to solve the above problems, the power supply system of the present invention is:
Power supply equipment connected to the load equipment via the power system and capable of increasing / decreasing output power based on an output command from the outside,
A control device;
And the control device includes:
Based on system inertia related to the power system, a system inertia absorbed power calculation unit that calculates system inertia absorbed power so that a change range of the frequency of the power system falls within a predetermined range;
A value obtained by subtracting the grid inertia absorption power from the shortage / surplus power that is a shortage or surplus of power in the power system, as the output command, a signal input / output unit that commands the power supply facility,
It is characterized by having.

According to the power supply system, the control device for the power supply system, and the program of the present invention, the power supply system can be operated at low cost.

It is a block diagram of the electric power system by one Embodiment of this invention. It is a block diagram of a control apparatus. It is a flowchart of the application program performed with a control apparatus. (A) Output power predicted value and demand power predicted value, (b) Interconnected power predicted value, (c) Power storage facility output command, (d) AC power facility output command, (e) Frequency change amount measured value FIG. It is a figure which shows the relationship of each output instruction | command.

<Configuration of Embodiment>
With reference to the block diagram shown in FIG. 1, the structure of the electric power grid | system A by one Embodiment of this invention is demonstrated.
In FIG. 1, the power system A includes a host system 1 (another power system) that is a wide-area backbone power system, and an independent power supply system 20 (power supply system). The independent power supply system 20 has a local system 2 (power system), and the local system 2 includes a control device 4, a power storage facility 5 (power source facility), an AC power source facility 6 (power source facility), and solar power generation. A facility 7 (natural energy power source facility), a wind power generation facility 8 (natural energy power source facility), a load facility 9 and the like are connected. The interconnection device 3 includes a switch 3a for setting on / off of the grid connection between the upper grid 1 and the local grid 2, and a transformer 3b for adjusting the voltage on the local grid 2 side when grid interconnection is performed. If the switch 3a is turned off, the local system 2 becomes a system independent of the upper system 1.

In addition, the power storage facility 5 is a power supply facility having no inertia, and includes a storage battery, an inverter, an AC-DC converter, and the like (none of which are shown). The storage battery is charged from the local system 2 via the AC-DC converter. Moreover, when shortage arises in the electric power of the local system 2, a storage battery is discharged and electric power is supplied to the local system 2 via an inverter. The AC power supply facility 6 is a power supply facility having inertia, and includes, for example, a turbine generator, an engine generator, and the like.

The power generation output of the solar power generation facility 7 varies depending on the solar radiation conditions. Moreover, the power generation output of the wind power generation facility 8 varies depending on the wind speed situation. Equipment whose power generation output fluctuates due to these natural phenomena is sometimes called “natural energy power supply equipment”. The load facility 9 includes a house that is a wide area power load, an office building that is a concentrated power load, a factory, and the like.

The control device 4 includes various electric quantities (power, voltage, power factor, etc.) transmitted from the local system 2 and each power supply facility, operating state signals such as state of charge (SOC) of the power storage facility 5, and interconnections. Based on the interconnection state signal of the device 3 and the system unit inertia constant which is the inertia constant of the entire independent power supply system 20, the power generation output suppression amount, the charge / discharge, etc. Supply power and other control commands.

Next, the configuration of the control device 4 will be described with reference to the block diagram shown in FIG.
The control device 4 includes a control arithmetic device 41, a signal input / output interface device 42 (signal input / output means, signal input / output unit), an input device 43, a display device 44, and a data storage device 45. .
The control arithmetic unit 41 includes hardware as a general computer such as a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), and a hard disk drive (HDD). Stores an OS (Operating System), application programs, various data, and the like. The OS and application programs are expanded in the RAM and executed by the CPU.

The input device 43 is used by an operator to input an operation command for setting / correcting a control command or for maintenance. The display device 44 is for the operator to check the driving situation and the like. The data storage device 45 stores various data used for application programs to be described later. The signal input / output interface device 42 mediates signal transmission inside the control device 4 and between the control device 4 and the components 3, 5 to 9.

In FIG. 2, the functions realized by the application program expanded in the RAM are shown as blocks in the control arithmetic unit 41.
The variable power output prediction calculation unit 411 calculates the predicted output power value P _PV (t) of the solar power generation facility 7 and the predicted output power value P _WF (t) of the wind power generation facility 8. The demand power prediction calculation unit 412 calculates a demand power prediction value P _LOAD (t) that is a prediction value of demand power of the independent power supply system 20.

Here, the total power that the local system 2 receives from the host system 1, the power storage facility 5, and the AC power supply facility 6 is referred to as “supplied power”. The interconnection power calculation unit 413 calculates a predicted supply power value P _SUP (t) that is an expected value of the supply power. A power generation facility connected to the independent power supply system 20 excluding the natural energy power supply facility (7, 8) is referred to as a “distributed power supply”. In the example of FIG. 1, the power storage facility 5 and the AC power source facility 6 correspond to a distributed power source. The distributed power output command calculation unit 414 in FIG. 2 calculates a distributed power output command P _DP (t) that is the total value of power to be output from the distributed power.

System unit inertia constant calculation unit 415 (system inertia calculation unit) calculates system unit inertia constant H. Although details will be described later, the system unit inertia constant H is a value representing the “hardness of change” of the system frequency f of the local system 2 with respect to power fluctuation. That is, if the system unit inertia constant H is small, the system frequency f is likely to change with respect to power fluctuations. Conversely, if the system unit inertia constant H is large, the system frequency f is difficult to change with respect to power fluctuations.

Further, the system inertia absorbed power calculation unit 416 (system inertia absorbed power calculation means) calculates system inertia absorbed power ΔP _I (t). The system inertia absorption power ΔP _I (t) represents the power absorbed by the fluctuation of the system frequency f. In addition, the distributed power supply correction output command calculation unit 417 includes a power storage facility output command P _BATT (t) that is an output command to the power storage facility 5 and an AC power supply facility output command P _EG (t that is an output command to the AC power supply facility 6. ) And calculate.

<Operation of Embodiment>
Next, the operation of this embodiment will be described with reference to the flowchart shown in FIG. FIG. 3 is a flowchart of an application program executed in the control arithmetic device 41.
In FIG. 3, when the process proceeds to step S <b> 31, weather control data and actual measurement data are read from the data storage device 45 by the control arithmetic device 41. Here, the weather prediction data is data that predicts the future weather, and includes predictions such as “weather”, “solar radiation”, “temperature”, “wind speed”, “wind direction”, and the like. The actually measured data is various kinds of actually measured data, and “demand power”, “power supply equipment operation state”, “electrical quantities”, “interconnection power”, “system unit inertia” in the independent power supply system 20. Constant H "," weather data ", etc. Here, the “meteorological data” includes measured values such as “weather”, “amount of solar radiation”, “temperature”, “wind speed”, “wind direction”, and the like. The “interconnection power” is power that is received or transmitted to the higher-order system 1.

When the process of step S31 is completed, the processes of steps S32 to S36 and the processes of steps S37 to S39 are executed in parallel. First, the processing of steps S32 to S36 will be described.
In step S32, the fluctuation power output prediction unit 411 (see FIG. 2) performs the predicted output power value P _PV (t) of the photovoltaic power generation facility 7 and the predicted output power value P _WF ( _{tw of the} wind power generation facility 8). t) is calculated. That is, since the output power of the solar power generation facility 7 and the wind power generation facility 8 depends on the weather, the past weather data, the past output power, the future weather prediction data previously obtained in step S31, Based on this relationship, the future output power can be predicted.

Next, when the process proceeds to step S33, the demand power prediction calculation unit 412 (see FIG. 2) calculates a demand power predicted value P _LOAD (t) that is a predicted value of demand power of the independent power supply system 20. The Since the measured data of demand power is correlated with past weather data such as temperature, it is based on the relationship between past weather data, weather forecast data, and past demand power previously obtained in step S31. Future power demand can be predicted. An example of the calculated output power predicted values P _PV (t), P _WF (t) and the predicted power demand P _LOAD (t) is shown in FIG.

In FIG. 3, when the process next proceeds to step S <b> 34, the interconnection power calculation unit 413 calculates a supply power expected value P _SUP (t). Specifically, the predicted power supply value P _SUP (t) includes the predicted output power values P _PV (t) and P _WF (t) obtained in steps S32 and S33 and the predicted power demand value P _LOAD ( Based on t), the following equation (1) is obtained.

According to the equation (1), the interconnection power calculation unit 413 supplies power from the solar power generation facility 7 and the wind power generation facility 8 which are natural energy power supply facilities to the local system 2, and the power storage facility 5 or the AC power supply facility 6. Is prioritized over the power supply to the local system 2. Thereby, the capability of a natural energy power supply facility can be used effectively.

Next, when the process proceeds to step S35, the interconnection power calculation unit 413 calculates an interconnection power expected value P _GC (t) that is an expected value of the interconnection power. Further, the maximum value of the interconnection power is referred to as the maximum interconnection power P _GCLIM (t). The maximum interconnection power P _GCLIM (t) is determined based on a contract between the operator of the upper grid 1 and the operator of the independent power supply system 20, but generally varies depending on the date and time. It is a function of t. The interconnected power expected value P _GC (t) is determined to be within a range of ± P _GCLIM (t). Here, an example of the waveform of the interconnected power expected value P _GC (t) is shown in FIG.

In FIG. 4B, before time t10, there is a connection (switch 3a is on), and after time t10, there is no connection (switch 3a is off). Therefore, after time t10, the interconnected power expected value P _GC (t) is zero. In the present embodiment, in order to reduce the burden on the power storage facility 5 and the AC power supply facility 6 in the independent power supply system 20, the predicted interconnected power value P _GC (t) is the expected power supply value P _SUP (t). It is desirable to determine so as to match or approximate the high frequency component.

That is, interconnection power calculating section 413, in the case of interconnection Yes, distributed power output command frequency components of P _DP (t) is borne on the upper line 1, the remaining frequency components system inertia absorbed power [Delta] P _I ( t) and a distributed power source (the power storage facility 5 and the AC power source facility 6).

Next, when the process proceeds to step S36, the distributed power output command calculation unit 414 calculates a distributed power output command P _DP (t) based on the following equation (2). As described above, the distributed power output command P _DP (t) is a total value of the power to be output by the distributed power supply (the power storage facility 5 and the AC power facility 6).

In the system unit inertia constant calculation unit 415, the processes of steps S37 and S38 are executed in parallel with the processes of steps S32 to S36 described above.
First, in step S37, it is determined whether or not a “frequency variation event” has occurred. Therefore, the “frequency fluctuation event” will be described. A measured value of the difference between the actual supplied power (the sum of the power supplied from the host system 1, the power storage facility 5, and the AC power supply facility 6) and the actual demand power is referred to as “power variation measured value ΔP”.

When the absolute value of the measured power change amount ΔP is sufficiently large, the system frequency f of the local system 2 increases or decreases with respect to the rated frequency f ₀ . Accordingly, in step S37, it is determined whether or not a frequency variation event has occurred based on whether or not the measured power change amount ΔP exceeds a predetermined value. If it is determined “Yes” in step S37, the process proceeds to step S38. If it is determined “No”, the process proceeds to step S39.

In step S38, the system unit inertia constant calculating unit 415 calculates and updates the system unit inertia constant H based on the following equation (3). As described above, the system unit inertia constant H is included in the “actual measurement data” read from the data storage device 45 when step S31 is executed. However, when step S38 is executed, the system unit inertia constant H is updated based on the equation (3). The updated value of the system unit inertia constant H is also written in the data storage device 45 and is reflected when step S31 is executed next.

In Equation (3), H is the system unit inertia constant (s), ΔP is the power change measurement value (pu), f is the system frequency, Δf is the frequency change measurement value (Hz), f _0. Is the rated frequency (Hz). As shown in the equation (3), by calculating the power change amount measured value ΔP at the time of the event occurrence and the frequency change rate (d (Δf / f ₀ ) / dt) at the time point from the measured data, The system unit inertia constant H can be obtained. That is, the system unit inertia constant calculation unit 415 has a function of calculating the system unit inertia constant H based on the inertia of the power storage facility 5, the AC power supply facility 6, the load facility 9, and the like.

When the operation of the independent power supply system 20 is started for the first time, there is no past actual measurement data, so the system unit inertia constant calculation unit 415 is connected to the independent power supply system 20. The sum of the inertia constants of the power supply facility 6 and the load facility 9 is calculated, and thereby the initial value of the system unit inertia constant H is calculated.

When the processing of steps S37 and S38 in the system unit inertia constant calculation unit 415 is completed, the system inertia absorption power calculation unit 416 executes the process of step S39, and the system inertia absorption power ΔP _I (t ) Is calculated.

In Expression (4), Δf _LIM is a system frequency deviation command value indicating an allowable value of the frequency change amount, and the value can be appropriately determined by the operator of the independent power supply system 20. System inertia absorbed power ΔP _I (t) represents power that can be absorbed by system inertia.

Steps S32 to S36 by the demand power prediction calculation unit 412, the grid power calculation unit 413, and the distributed power output command calculation unit 414, and the steps S37 to S36 by the system unit inertia constant calculation unit 415 and the system inertia absorbed power calculation unit 416 When the process of S39 ends, the distributed power supply correction output command calculation unit 417 executes the process of step S40. Here, the correction output command P _DP (t) * is calculated based on the following equation (5).

The corrected output command P _DP (t) * obtained by Expression (5) is a command for the total value of the electric power output from the power storage facility 5 and the AC power supply facility 6.
Next, when the process proceeds to step S41, the distributed power supply correction output command calculation unit 417 stores the power storage that is an output command for the power storage facility 5 based on the correction output command P _DP (t) * obtained in step S40. The facility output command P _BATT (t) and the AC power facility output command P _EG (t), which is an output command for the AC power facility 6, are calculated so as to satisfy the following equation (6).

Next, when the process proceeds to step S42, the control arithmetic device 41 sends the above-described control commands (P _BATT (t), P _EG (t), P _DP (t), etc.) to the signal input / output interface device 42. To the power storage facility 5, the AC power supply facility 6, the solar power generation facility 7, the wind power generation facility 8, the interconnection device 3, and the like. And a process returns to step S31 and the operation | movement mentioned above is repeated.

Here, referring to FIG. 5, distributed power output command P _DP (t), corrected output command P _DP (t) *, system inertia absorbed power ΔP _I (t), power storage facility output command P _BATT (t), The mutual relationship between the AC power supply facility output command P _EG (t) will be described.
In FIG. 5, the distributed power output command P _DP (t) rises in a step shape at time t3. The corrected output command P _DP (t) * has a waveform obtained by attenuating the high frequency component of the distributed power output command P _DP (t). As shown in Expression (5), the difference between the two (region QA) is borne by the system inertial absorption power ΔP _I (t).

Further, in the corrected output command P _DP (t) *, the medium frequency component (region QB) is borne by the storage facility output command P _BATT (t), and the lowest frequency component (region QC) is output from the AC power supply facility. There is a tendency to be borne by the directive P _EG (t).

Here, the effect of the present embodiment will be described with reference to FIGS. 4C, 4D, and 4E are waveform diagrams of the power storage facility output command P _BATT (t), the AC power supply facility output command P _EG (t), and the measured frequency change Δf, respectively, and are solid lines. Is the present embodiment, and the broken line is the comparative example. Here, the “comparative example” is an example in which the storage facility output command P _BATT (t) and the AC power facility output command P _EG (t) are set without considering the system inertia absorption power ΔP _I (t). is there.

According to the present embodiment, the system inertia absorption power ΔP _I (t) is generated by changing the frequency variation measurement value Δf within the range of ± Δf _LIM , and the presence of the system inertia absorption power ΔP _I (t) is determined. As a premise, output commands P _BATT (t) and P _EG (t) can be determined. Thus, according to this embodiment, FIG. 4 (c), the as shown (d), the output command than Comparative Example P _BATT (t), the output response speed of the P _EG (t) Output The change width can be suppressed. Therefore, according to this embodiment, the burden (especially the request | requirement of a high-speed response) with respect to the electrical storage equipment 5 or the alternating current power supply equipment 6 can be reduced, these lifetimes can be aimed at, initial cost, maintenance cost, etc. Can be kept low.

By the way, in FIGS. 4A to 4E, the grid connection is cut off at time t10. This is because the grid connection is suddenly cut off due to a power failure of the upper system 1 or the like. Is assumed. Even when the grid connection is suddenly cut off at time t10 and the predicted grid power value P _GC (t) becomes zero, according to this embodiment, the grid unit inertia constant H and the grid frequency deviation command Based on the value Δf _LIM , the system inertia absorbed power ΔP _I (t) is calculated, and the distributed power output command P _DP (t) is calculated on the assumption that the system inertia absorbed power ΔP _I (t) exists. Thereby, the fluctuation | variation of the system frequency f can be suppressed before and after the disconnection of the grid connection, and the independent power supply system 20 can be operated stably.

[Modification]
The present invention is not limited to the above-described embodiments, and various modifications can be made. The above-described embodiments are illustrated for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. Further, it is possible to delete a part of the configuration of each embodiment, or to add or replace another configuration. Examples of possible modifications to the above embodiment are as follows.

(1) In the above embodiment, an example in which the solar power generation facility 7 and the wind power generation facility 8 are applied as a specific example of the natural energy power supply facility in which the power generation output fluctuates due to a natural phenomenon has been described. The power supply facilities are not limited to these, and may be geothermal power generation facilities, ocean current power generation facilities, tidal power generation facilities, small hydropower generation facilities, and the like.

(2) The system frequency deviation command value Δf _LIM may be switched according to the date and time. Generally, in homes and office buildings, even if the amount of frequency change increases, there is a tendency that no particular inconvenience occurs. On the other hand, in a factory, when the frequency change amount is large, a product may be defective. When such a factory is included in the load facility 9, the system frequency deviation command value Δf _LIM may be decreased during the operation period of the factory facility, and Δf _LIM may be increased during the stop period of the factory facility.

(3) In the above embodiment, the system unit inertia constant H1 is a common value regardless of whether or not the upper system 1 and the local system 2 are connected, but the system unit inertia constant H1 in the case of connection is present. And the system unit inertia constant H2 in the case of no interconnection may be calculated separately. Further, when the system unit inertia constant H1 or H2 is calculated in step S38, the moving average value of the latest calculated value of H1 or H2 and the past calculated value is obtained, and this moving average value is replaced with H1 or H2. May be applied.

(4) In the above embodiment, the system inertia absorbed power [Delta] P _I (t) calculated by Equation (4), subtracts the system inertia absorbed power [Delta] P _I (t) from the distributed power supply output command P _DP (t) The corrected output command P _DP (t) * was calculated by equation (5). However, the calculation method of ΔP _I (t) and P _DP (t) * is not limited to this.
For example, high-pass filter processing is performed on the distributed power output command P _DP (t) to obtain the system inertia absorbed power ΔP _I (t), and the system inertia absorbed power ΔP is calculated from the distributed power output command P _DP (t). _I (t) may be subtracted to obtain the corrected output command P _DP (t) *.
Conversely, we obtain a corrected output command P _DP (t) * by performing a low-pass filter processing on the distributed power supply output command P _DP (t), the corrected output from the distributed power supply output command P _DP (t) The command inertia power absorption ΔP _I (t) may be obtained by subtracting the command P _DP (t) *.

(5) Since the hardware of the control device 4 in the above embodiment can be realized by a general computer, a program or the like corresponding to the flowchart shown in FIG. 3 is stored in a storage medium or distributed via a transmission path. Also good.

(6) Although the process shown in FIG. 3 has been described as a software process using a program in the above embodiment, a part or all of the process is an ASIC (Application (Specific Integrated Circuit) or FPGA. It may be replaced with hardware processing using (field-programmable gate array) or the like.

1 Host system (other power system)
2 Local system (electric power system)
3 Interconnection device 4 Control device (computer)
5 Power storage equipment (power supply equipment)
6 AC power supply equipment (power supply equipment)
7 Solar power generation facilities (natural energy power supply facilities)
8 Wind power generation facilities (natural energy power supply facilities)
9 Load equipment 20 Independent power supply system (power supply system)
41 control arithmetic unit 42 signal input / output interface device (signal input / output means, signal input / output unit)
415 System unit inertia constant calculation unit (system inertia calculation unit)
416 System inertia absorbed power calculation unit (system inertia absorbed power calculation means)
417 Distributed power correction output command calculation unit
P _BATT (t) Power storage facility output command (output command)
P _DP (t) Distributed power output command (insufficient / surplus power)
P _DP (t) * Compensation output command (output command)
P _EG (t) AC power facility output command (output command)
ΔP _I (t) (system inertia absorbed power)
ΔP Power change measurement (power change)
Δf Frequency change measurement (frequency change)
H System unit inertia constant (system inertia)

Claims (8)

1. Power supply equipment connected to the load equipment via the power system and capable of increasing / decreasing output power based on an output command from the outside,
   A control device;
   And the control device includes:
   Based on system inertia related to the power system, a system inertia absorbed power calculation unit that calculates system inertia absorbed power so that a change range of the frequency of the power system falls within a predetermined range;
   A value obtained by subtracting the grid inertia absorption power from the shortage / surplus power that is a shortage or surplus of power in the power system, as the output command, a signal input / output unit that commands the power supply facility,
   A power supply system comprising:
2. The control device includes:
   The system further includes a system inertia calculation unit that calculates system inertia based on a power change amount that is a difference between demand power and supply power in the power system and a frequency change amount in the power system. The power supply system according to 1.
3. An interconnection device for setting an on / off state of interconnection between the power system and another power system;
   When the interconnection device is in an on state, the control device causes the other power system to bear the high frequency component of the shortage / surplus power, and the remaining frequency component is used as the system inertia absorption power and the power supply facility. The power supply system according to claim 2, further comprising a function of causing a burden on the power supply.
4. It further includes a natural energy power supply facility that is connected to the power system and whose power generation output varies due to a natural phenomenon,
   The power supply according to claim 3, wherein the control device further has a function of giving priority to power supply from the natural energy power supply facility to the power system over power supply from the power supply facility to the power system. system.
5. The power supply system according to claim 1, wherein the control device further has a function of calculating the system inertia based on an inertia of the power supply facility or the load facility.
6. 2. The control device according to claim 1, further comprising a function of calculating the system inertia absorption power and the system inertia absorption power by performing a filtering process on the shortage / surplus power. Power supply system.
7. Based on the system inertia related to the power system to which the power supply equipment capable of increasing / decreasing the output power based on the output command from the outside and the load equipment is connected, the frequency change range of the power system falls within a predetermined range. As described above, a system inertia absorbed power calculation unit that calculates system inertia absorbed power,
   A value obtained by subtracting the grid inertia absorption power from the shortage / surplus power that is a shortage or surplus of power in the power system, as the output command, a signal input / output unit that commands the power supply facility,
   A control device for a power supply system, comprising:
8. Power supply equipment connected to the load equipment via the power system and capable of increasing / decreasing output power based on an output command from the outside,
   A computer,
   A program applied to a power supply system having the computer,
   Based on the system inertia related to the power system, the system inertia absorbed power calculation means for calculating the system inertia absorbed power so that the change range of the frequency of the power system falls within a predetermined range,
   A signal input / output means for instructing the power supply facility as a value obtained by subtracting the grid inertia absorption power from a shortage / surplus power that is a shortage or surplus of power in the power system,
   Program to function as.

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