JP6548570B2 - POWER SUPPLY SYSTEM, CONTROL DEVICE AND PROGRAM FOR POWER SUPPLY SYSTEM - Google Patents

Description

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

  The power system provided in a limited area is called "local system", and the existing wide area power system is called "upper system". The local grid is connected to the upper grid as needed, selling power to the upper grid, or purchasing power from the upper grid. As a background art of such a technical field, the abstract of Patent Document 1 states that “the power system 11 has a wind power generation facility 15 and a solar power generation facility which are natural energy type power supplies 10 via the main busbar 13 and the auxiliary busbar 14 The total power calculation unit 19 is connected to the power load 17 in addition to the power load 17, and the total power is calculated by the total power calculation unit 19. Further, the main bus 13 is distributed to perform load following operation through the auxiliary bus. It is connected to the power storage device 22 which consists of an engine generator 21 and a secondary battery as a stationary power source The deviation between the load power detection value and the interconnection point reception power setting value is a low frequency component and a high frequency component by the low pass filter 27 To control the engine generator 21 with low frequency components and to control the power storage device 22 with high frequency components.

  Also, on page 3 of Non-Patent Document 1, “A method to estimate the ratio of inertia constant as whole system to governor capacity of governor free generator is developed, and system frequency in 10 cases of events such as generator load cut off These estimations were made on the basis of the actual measurement of the change of the load, the dropout amount and the system capacity, and as a result, the unit inertia constant of the system is approximately 14-18 seconds (system capacity reference), and the governor free generator ratio is the system capacity. It is estimated that it is about 0.2 to 0.4.

JP, 2006-333563, A

Toshio Inoue, 3 others, development of estimation method of grid frequency characteristics based on actual measurement results (Power Central Research Institute Report T94016), [online], [Nov 09, 2015 search], Internet <URL: http: / /criepi.denken.or.jp/jp/kenkikaku/report/detail/T94016.html〉

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, about the frequency deviation which is the difference between the rated frequency (for example, 50 Hz, 60 Hz) and the actual frequency. , Was not considered. Therefore, there is a problem that the capacity required for the facility increases and the initial cost and the maintenance cost become high.
The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to provide a power supply system that can be operated inexpensively, 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
A power supply facility connected to a load facility via an electric power system and capable of adjusting the output power based on an external output command,
A controller,
And the control unit
A system inertia absorbed power calculation unit that calculates system inertia absorbed power such that a change range of the frequency of the power system falls within a predetermined range based on system inertia related to the power system;
A signal input / output unit that instructs the power supply equipment of a value obtained by subtracting the system inertia absorbed power from the shortage or surplus power which is a shortage or surplus of power in the power system, as the output command,
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 inexpensively.

FIG. 1 is a block diagram of a power system according to an embodiment of the present invention. It is a block diagram of a control device. 5 is a flowchart of an application program executed by the control device. (A) Output power forecast value and demand power forecast value, (b) Interconnected power forecast value, (c) storage facility output command, (d) AC power facility output command, (e) each waveform of measured value of frequency change FIG. It is a figure which shows the relationship of each output instruction | command.

<Configuration of Embodiment>
The configuration of a power system A according to an embodiment of the present invention will be described with reference to the block diagram shown in FIG.
In FIG. 1, a power system A includes a host system 1 (other power system), which 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 grid 2 (power grid), and the local grid 2 includes the control device 4, the storage facility 5 (power supply facility), the AC power supply facility 6 (power supply facility), and solar power generation. Equipment 7 (natural energy power supply equipment), wind power generation equipment 8 (natural energy power equipment), load equipment 9 and the like are connected. The grid connection device 3 includes a switch 3a for setting on / off of grid connection between the upper grid 1 and the local grid 2 and a transformer 3b for adjusting a voltage on the local grid 2 side in grid connection. When the switch 3 a is turned off, the local system 2 becomes an independent system from the upper system 1.

  In addition, the storage facility 5 is a power supply facility without 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 grid 2 via the AC-DC converter. Moreover, when shortage arises in the electric power of the local grid 2, the storage battery is discharged and power is supplied to the local grid 2 through the inverter. Further, 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 fluctuates according to the solar radiation condition. Further, the power generation output of the wind power generation facility 8 fluctuates according to the wind speed condition. Equipment whose power generation output fluctuates due to these natural phenomena is sometimes called "natural energy power supply equipment". The load equipment 9 includes homes that are wide area power loads, office buildings that are concentrated power loads, factories, and the like.

  The control device 4 is connected to the local grid 2 and the amount of electricity (electric power, voltage, power factor, etc.) transmitted from each power supply facility, operation state signals such as the state of charge (SOC) of the storage facility 5, etc. Based on the connection state signal of the device 3 and the system unit inertia constant which is the inertia constant of the whole of the independent power supply system 20, the amount of generation output suppression, charge and discharge with respect to the components 5 to 8 described above. Supply control commands such as power.

Next, the configuration of the control device 4 will be described with reference to the block diagram shown in FIG.
The control device 4 has 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 device 41 includes hardware as a general computer, such as a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), a hard disk drive (HDD), etc. Stores an operating system (OS), 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 for the operator to input an operation command for setting / correcting a control command or for maintenance. The display device 44 is for the operator to confirm the driving condition and the like. The data storage device 45 stores various data used for an application program described later. The signal input / output interface unit 42 mediates signal transmission inside the control unit 4 and between the control unit 4 and the components 3, 5-9.

In FIG. 2, inside the control arithmetic device 41, functions realized by the application program developed in the RAM are shown as blocks.
The fluctuating power supply output prediction calculation unit 411 calculates an output power prediction value P _PV (t) of the solar power generation facility 7 and an output power prediction 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) which is a prediction value of the demand power of the independent power supply system 20.

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

  The grid unit inertia constant calculation unit 415 (grid inertia calculation unit) calculates a grid unit inertia constant H. Although the details will be described later, the system unit inertia constant H is a value representing the "inconvenient change" of the system frequency f of the local system 2 with respect to the power fluctuation. That is, if the grid unit inertia constant H is small, the grid frequency f is likely to change due to power fluctuations, and conversely, if the grid unit inertia constant H is large, the grid frequency f is unlikely to change against power fluctuations.

Further, the system inertia absorbed power calculating unit 416 (system inertia absorbed power calculating unit) calculates the system inertia absorbed power ΔP _I (t). The system inertia absorbed power ΔP _I (t) represents the power absorbed by the fluctuation of the system frequency f. Further, distributed power supply correction output command calculation unit 417 outputs storage storage device 5 power storage facility output command P _BATT (t), and AC power supply equipment 6 output command AC power supply output instruction P _EG (t And calculate.

<Operation of Embodiment>
Next, the operation of the present embodiment will be described with reference to the flowchart shown in FIG. FIG. 3 is a flowchart of an application program executed by the control arithmetic device 41.
When the process proceeds to step S31 in FIG. 3, the weather calculation data and the actual measurement data are read from the data storage device 45 by the control arithmetic device 41. Here, the weather forecast data is data forecasting future weather, and includes forecasts such as "weather", "amount of solar radiation", "air temperature", "wind speed", "wind direction" and the like. Also, the actual measurement data are various data actually measured, and the “demand power”, “power supply facility operation state”, “electric quantities”, “interconnected electric power”, “system unit inertia” in the independent power supply system 20 Includes constant H "," weather data ", etc. Here, "weather data" includes actual measurement values such as "weather", "solar radiation amount", "air temperature", "wind speed", "wind direction" and the like. Further, “connected power” is power to be received or transmitted to the upper grid 1.

When the process of step S31 ends, the processes of steps S32 to S36 and the processes of steps S37 to S39 are executed in parallel. First, the processes of steps S32 to S36 will be described.
In step S32, the output power prediction value P _PV (t) of the solar power generation facility 7 and the output power prediction value P _{WF of the} wind power generation facility 8 are calculated by the fluctuating power output prediction calculation unit 411 (see FIG. 2). 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 obtained in step S31, the past output power, and the future weather forecast data The future output power can be predicted based on the relationship

Next, when the process proceeds to step S33, the demand power prediction calculation unit 412 (see FIG. 2) calculates a demand power forecast value P _LOAD (t) which is a forecast value of demand power of the independent power supply system 20. Ru. Since the measured data of demand power has correlation with the past weather data such as temperature, based on the relationship between the past weather data previously obtained at step S31, the weather forecast data, and the past demand power Future demand power can be predicted. Here, an example of the waveform of the calculated output power predicted values P _PV (t) and P _WF (t) and the demand power predicted value P _LOAD (t) is shown in FIG. 4A.

式（１）によれば、連系電力演算部４１３は、自然エネルギー電源設備である太陽光発電設備７および風力発電設備８から局所系統２への電力供給を、蓄電設備５または交流電源設備６から局所系統２への電力供給よりも優先させている。これにより、自然エネルギー電源設備の能力を有効に活用することができる。 In FIG. 3, when the process next proceeds to step S34, the interconnection power calculation unit 413 calculates the supply power prediction value P _SUP (t). Specifically, the estimated supply power value P _SUP (t) is the estimated output power value P _PV (t), P _WF (t) previously obtained in steps S 32 and S 33, and the estimated demand power value P _LOAD ( Based on t), the following equation (1) is obtained.

According to the equation (1), the interconnection power calculating 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 grid 2 Priority over the power supply to the local grid 2. Thereby, the capacity of the natural energy power supply facility can be effectively utilized.

Next, when the process proceeds to step S35, the interconnection power calculation unit 413 calculates an interconnection power prediction value P _GC (t) which is a prediction value of the interconnection power. Further, the maximum value of the interconnection power is referred to as 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 according to the date and time. It is a function of t. The interconnection power prediction value P _GC (t) is determined to be within the range of ± P _GCLIM (t). Here, an example of the waveform of the interconnection power prediction value P _GC (t) is shown in FIG. 4 (b).

In FIG. 4B, the connection is present (the switch 3a is on) before time t10, and the connection is absent (the switch 3a is off) after time t10. Therefore, after time t10, the interconnection power prediction value P _GC (t) is zero. In the present embodiment, in order to reduce the load on the storage facility 5 and the AC power supply facility 6 in the independent power supply system 20, the interconnection power prediction value P _GC (t) is equal to the supply power prediction value P _SUP (t). It is desirable to define to match or approximate the high frequency component.

That is, when there is interconnection, interconnection power operation unit 413 causes high-frequency component of dispersed power output command P _DP (t) to be borne by host system 1, and the remaining frequency component is system inertia absorbed power ΔP _I ( t) and a distributed power supply (the power storage facility 5 and the AC power supply facility 6).

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

In parallel with the process of steps S32 to S36 described above, the system unit inertial constant calculation unit 415 executes the processes of steps S37 and S38.
First, in step S37, it is determined whether a "frequency fluctuation event" has occurred. Therefore, the "frequency change event" will be described. The measured value of the difference between the actual supplied power (the sum of the power supplied from the upper system 1, the storage facility 5, and the AC power supply facility 6) and the actual demand power is called "power change amount measured value ΔP".

If the absolute value is sufficiently large power variation measurement ΔP is the system frequency f of the local system 2, to increase or decrease the rated frequency f _0. Therefore, in step S37, it is determined whether or not a frequency fluctuation event has occurred, based on whether or not the power variation measurement value ΔP exceeds a predetermined value. Then, if "Yes" is determined in step S37, the process proceeds to step S38, and 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 “measured data” read from the data storage device 45 when step S31 is executed. However, when step S38 is executed, the systematic unit inertia constant H is updated based on the equation (3). The updated value of the system unit inertia constant H is also written to the data storage device 45, and is reflected when step S31 is executed next.

In equation (3), H is a system unit inertia constant (s), ΔP is a measured power change (pu), f is a system frequency, and Δf is a measured change in frequency (Hz), f _0. Is the rated frequency (Hz). As shown in the equation (3), by calculating the measured power change amount ΔP at the time of occurrence of the event and the frequency change rate (d (Δf / f ₀ ) / dt) at that time from the measured data, The system unit inertia constant H can be determined. 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.

  It should be noted that when the operation of the stand-alone power supply system 20 is first started, since there is no actual measurement data in the past, the system unit inertia constant calculation unit 415 is an AC connected to the stand-alone power supply system 20. The total of the inertia constants of the power supply equipment 6, the load equipment 9, etc. is calculated, and thereby the initial value of the grid unit inertia constant H is calculated.

式（４）において、Δｆ_LIMは、周波数変化量の許容値を示す系統周波数偏差指令値であり、その値は、独立型電力供給システム２０の運用者が適宜定めることができる。系統慣性吸収電力ΔP_I（t）は、系統慣性によって吸収できる電力を表す。 When the processing of steps S37 and S38 in system unit inertia constant calculation unit 415 is completed, the process of step S39 is executed in system inertia absorbed power calculation unit 416, and system inertia absorbed power ΔP _I shown in the following equation (4) ) Is calculated.

In Formula (4), (DELTA) f _LIM is a grid | system | group frequency deviation command value which shows the tolerance _| permissible_value of frequency variation, The operator of the independent type power supply system 20 can define the value suitably. The system inertia absorbed power ΔP _I (t) represents the power that can be absorbed by the system inertia.

The processing of steps S32 to S36 by the demand power prediction calculation unit 412, the interconnection power calculation unit 413, and the distributed power output command calculation unit 414, and the steps S37 to 37 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 computation unit 417 executes the process of step S40. Here, the corrected output command P _DP (t) * is calculated based on the following equation (5).

The corrected output command P _DP (t) * obtained by the equation (5) is a command of the total value of the powers output from the storage facility 5 and the AC power supply facility 6.
Next, when the process proceeds to step S41, the dispersed power source correction output command computation unit 417 stores electricity that is an output command to the 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 supply facility output command P _EG (t) which is the output command for the AC power facility 6 are calculated so as to satisfy the following expression (6).

Next, when the process proceeds to step S42, the control arithmetic device 41 transmits the control commands (P _BATT (t), P _EG (t), P _DP (t), etc.) described above to the signal input / output interface device 42. , The AC power supply equipment 6, the solar power generation equipment 7, the wind power generation equipment 8, the interconnection device 3 and the like. Then, the process returns to step S31, and the above-described operation 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), storage facility output command P _BATT (t), And the interrelation of the AC power equipment output command P _EG (t).
In FIG. 5, the distributed power supply output command P _DP (t) rises in a step-like manner at time t3. The correction output command P _DP (t) * has a waveform obtained by attenuating the high frequency component of the dispersed power supply output command P _DP (t). As shown in equation (5), the difference between the two (area QA) is borne by the system inertia absorbed power ΔP _I (t).

Also, among 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 the AC power supply facility output There is a tendency to be borne by the command P _EG (t).

Here, the effects of the present embodiment will be described with reference to FIGS. 4 (c), (d) and (e). FIGS. 4 (c), (d) and (e) are waveform diagrams of the storage facility output command _PBATT (t), the AC power supply facility output command _PEG (t), and the frequency variation measurement value Δf, respectively. Is according to the present embodiment, and the broken line is according to the comparative example. Here, the “comparative example” is an example in which the storage facility output command P _BATT (t) and the AC power supply facility output command P _EG (t) are set without considering the system inertia absorbed power ΔP _I (t). is there.

According to the present embodiment, the system inertia absorbed power ΔP _I (t) is generated by fluctuating the frequency change measurement value Δf within the range of ± Δf _LIM , and the presence of the system inertia absorbed power ΔP _I (t) As a premise, the output commands P _BATT (t) and P _EG (t) can be determined. Thus, according to the present embodiment, as shown in FIGS. 4C and 4D, the output response speed and the output of the output commands P _BATT (t) and P _EG (t) are higher than those of the comparative example. The variation width can be suppressed. Therefore, according to the present embodiment, the burden on the power storage facility 5 and the AC power supply facility 6 (particularly, the requirement for high-speed response) can be reduced, and the service life can be extended. Can be kept low.

By the way, in Fig.4 (a)-(e), although grid connection is interrupted at time t10, this is a state where grid connection is suddenly interrupted by circumstances such as a power failure of host system 1 Is assumed. According to the present embodiment, the grid unit inertia constant H and the grid frequency deviation command are obtained even if the grid connection is suddenly cut off at time t10 and the grid power estimated value P _GC (t) becomes zero. The system inertia absorbed power ΔP _I (t) is calculated based on the value Δf _LIM, and the distributed power output command P _DP (t) is calculated on the premise of the system inertia absorbed power ΔP _I (t). Thereby, before and after the interruption of the grid connection, the fluctuation of the grid frequency f can be suppressed, and the independent power supply system 20 can be operated stably.

[Modification]
The present invention is not limited to the embodiments described above, and various modifications are possible. The embodiments described above are illustrated to facilitate understanding of the present invention, and are not necessarily limited to those having all the described configurations. Further, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, it is possible to delete part of the configuration of each embodiment or to add / replace other configuration. Possible modifications to the above embodiment are, for example, 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 has been described as a specific example of the natural energy power supply facility whose power generation output fluctuates due to natural phenomena. The power supply equipment is not limited to these, and may be a geothermal power generation equipment, an ocean current power generation equipment, a tidal power generation equipment, a small hydroelectric power generation equipment, or 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, there is a tendency not to cause any particular inconvenience even if the amount of frequency change is large. On the other hand, in the factory, when the amount of frequency change becomes large, defects may occur in the product. When the load facility 9 includes such a factory, the system frequency deviation command value Δf _LIM may be reduced during the operation period of the factory facility, and Δf _LIM may be increased during the idle period of the factory facility.

(3) In the above embodiment, although the system unit inertia constant H is a common value regardless of the presence or absence of the connection between the upper system 1 and the local system 2, the system unit inertia constant H1 in the case of the system connection And the system unit inertia constant H2 in the case of no connection may be calculated separately. In addition, when the system unit inertia constant H1 or H2 is calculated in step S38, a moving average value of the latest calculation value of H1 or H2 and the past calculation value is determined, and this moving average value is replaced with H1 or H2. May be applied.

(4) In the above embodiment, the system inertia absorbed power ΔP _I (t) is calculated by equation (4), and the system inertia absorbed power ΔP _I (t) is subtracted from the distributed power output command P _DP (t) The corrected output command P _DP (t) * was calculated according to equation (5). However, the method of calculating ΔP _I (t), P _DP (t) * is not limited to this.
For example, distributed power output command P _DP obtains the system inertia absorbed power [Delta] P _I (t) by applying the high-pass filtering with respect to (t), the system inertia absorbed power [Delta] P from the distributed power supply output command P _DP (t) _The corrected output command P _DP (t) * may be obtained by subtracting _I (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 system inertia absorbed power ΔP _I (t) may be determined by subtracting the command P _DP (t) *.

(5) The hardware of the control device 4 in the above embodiment can be realized by a general computer, so programs etc. corresponding to the flowchart shown in FIG. 3 are stored in a storage medium or distributed via a transmission line. It is also good.

(6) The process shown in FIG. 3 has been described as software-like process using a program in the above embodiment, but a part or all of it may be an ASIC (Application Specific Integrated Circuit; IC for specific application) or an FPGA It may be replaced by hardware processing using (field-programmable gate array) or the like.

1 Upper system (other power system)
2 Local grid (power grid)
3-connected device 4 control device (computer)
5 Storage equipment (power supply equipment)
6 AC power supply equipment (power supply equipment)
7 Photovoltaic power generation equipment (natural energy power supply equipment)
8 Wind power generation equipment (natural energy power equipment)
9 Load Equipment 20 Independent Power Supply System (Power Supply System)
41 control arithmetic unit 42 signal input / output interface unit (signal input / output means, signal input / output unit)
415 System unit inertia constant calculation unit (system inertia calculation unit)
416 System Inertia Absorbing Power Calculator (System Inertia Absorbing Power Calculator)
417 Distributed Power Supply Correction Output 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) * correction output command (output command)
P _EG (t) AC power supply facility output command (output command)
ΔP _I (t) (system inertial absorption power)
ΔP Power change measurement value (power change)
Δf Measured value of frequency change (frequency change)
H system unit inertia constant (system inertia)

Claims (8)

A power supply facility connected to a load facility via an electric power system and capable of adjusting the output power based on an external output command,
A controller,
And the control unit
A system inertia absorbed power calculation unit that calculates system inertia absorbed power such that a change range of the frequency of the power system falls within a predetermined range based on system inertia related to the power system;
A signal input / output unit that instructs the power supply equipment of a value obtained by subtracting the system inertia absorbed power from the shortage or surplus power which is a shortage or surplus of power in the power system, as the output command,
An electric power supply system characterized by having. The controller is
The system further includes a system inertia operation unit that calculates system inertia based on a power change amount which is a difference between demand power and supplied power in the power system and a frequency change amount in the power system. The power supply system according to 1. The power system further includes an interconnection apparatus for setting an on / off state of interconnection between the power system and another power system,
When the interconnection device is in the ON state, the control device causes the high frequency component of the shortage / excessive power to be shared by the other power system, and the remaining frequency component is the system inertial absorption power and the power supply facility The power supply system according to claim 2, further comprising: The power system further includes a natural energy power supply facility connected to the power system and generating output fluctuates due to natural phenomena;
The power supply according to claim 3, wherein the control device further has a function of prioritizing the power supply from the natural energy power supply facility to the power system over the power supply from the power supply facility to the power system. system. The power supply system according to claim 1, wherein the control device further has a function of calculating the system inertia based on inertia of the power supply facility or the load facility. The said control apparatus is further provided with the function which calculates the said system inertial absorption electric power and the said system inertial absorption electric power by performing a filter process with respect to the said inadequate and surplus electric power, It is characterized by the above-mentioned. Power supply system. The variation range of the frequency of the electric power system falls within a predetermined range based on the system inertia related to the electric power system to which the output power can be increased or decreased based on the output command from the outside and the load facility connected. And a system inertia absorbed power calculating unit that calculates the system inertia absorbed power;
A signal input / output unit that instructs the power supply equipment of a value obtained by subtracting the system inertia absorbed power from the shortage or surplus power which is a shortage or surplus of power in the power system, as the output command,
A controller for a power supply system, comprising: A power supply facility connected to a load facility via an electric power system and capable of adjusting the output power based on an external output command,
With a computer
A program applied to a power supply system having
System inertia absorbed power computing means for calculating system inertia absorbed power such that the change range of the frequency of the power system falls within a predetermined range based on system inertia related to the power system;
Signal input / output means for commanding the power supply facility as the output command a value obtained by subtracting the system inertia absorbed power from the shortage or surplus power which is the shortage or surplus of the power in the power system,
Program to function as.

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