JP2012029414A - Power system interconnection monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power system interconnection monitoring device that is capable of identifying a source of generation of reverse-flow power to another power system, and that is applicable to a power system interconnects to another power system and provided with a power generator and a power storage device.SOLUTION: A power system interconnection monitoring device performs: interconnecting to a commercial system 2; supplying, to electricity demanding loads 7A and 7B, power supplied from the commercial system 2, natural energy utilizing-power generators 4A and 4B, or generators 5A and 5B; monitoring a power system provided with power storage devices 6A and 6B; respectively measuring flow power PS with the commercial system 2, power PNA and PNB sourced from the natural energy utilizing-power generation, power PGA and PGB sourced from the generators, charge and discharge power PBA and PBB, and load power PLA and PLB; calculating a breakdown of generation source of storage power of the power storage devices 6A and 6B based on the measured power PS through PLB; and calculating a breakdown of a generation source of reverse flow power of the commercial system 2 based on the power PS through PLB and the calculated generation source of the storage power.

Description

  Embodiments described herein relate generally to a power grid interconnection monitoring device that monitors a linked power grid.

  In general, a power system using a distributed power source such as a natural energy-based power generation, a fuel supply-type power generation, or a renewable energy-based power generation is known. Natural energy-based power generation is solar power generation or wind power generation. The fuel supply type power generation is a fuel cell or a gas engine power generation device. Renewable energy-based power generation is biomass power generation or hydropower generation. In order to link an electric power system using such a distributed power supply to an electric power system owned by an electric power company, an electric power system interconnection monitoring device may be installed.

  The role of the power system interconnection monitoring device of the distributed power supply is as follows. The power grid interconnection monitoring device is linked to the power grid of the power company and distributes the generated power to the power grid. The power grid interconnection monitoring device operates a distributed power source safely, protecting it from accidents occurring in the power grid. The power grid interconnection monitoring device works to minimize the influence on the power grid, which can be called public facilities. As such a function, the power system interconnection monitoring device prevents an isolated operation in the power system from a safety problem, or prevents an accident spread to the power system due to a failure of the distributed power source itself.

  The power system interconnection monitoring device may be applied to a power system that links a small-scale power system in which a plurality of distributed power sources and power demand loads are mixed with a power system of a power company. In this case, the power system interconnection monitoring device controls the power demand of the power company so that the effective power at the connection point between the power system and the small-scale power system is within a certain range, and for the purpose of reducing energy costs. Some have a function of controlling supply power (generated power).

  In recent years, the introduction and expansion of power generation using natural energy such as solar power generation and wind power generation has progressed, and the number of power supply systems provided with a storage battery for stabilizing output has increased. In addition, there is a general consumer who installs fuel-supplemented power generation as a private power generator in such a power supply system. When a system in which various power generation devices and demand loads are mixed and operated in this way is often contracted with “no reverse power flow” to the commercial system. However, recently, in order to sell surplus power such as solar power generation and wind power generation to electric power companies, there is an increasing number of contracts with reverse power flow. Furthermore, in order to popularize solar power generation, there is a movement to raise the purchase price of power derived from solar power generation.

JP 2005-86953 A JP 2006-204081 A JP 2008-104332 A JP 2008-148382 A

  However, the power grid interconnection monitoring apparatus described above cannot determine the origin of stored power or reverse power flow. For this reason, when the reverse flow is caused to flow into the commercial system, the power grid interconnection monitoring device cannot determine how much of the reverse flow power is generated by a specific power generation device. For this reason, even if a contract is made with an electric power company with “reverse power flow”, it is not possible to sell power at the power purchase price of the power generation device, assuming that the power is generated by a specific power generation device.

  Therefore, an object according to an embodiment of the present invention is applied to a power system that is linked to another power system and includes a power generation device and a power storage device, and identifies the power generation origin of reverse power flow to the other power system. An object of the present invention is to provide a power system interconnection monitoring device capable of performing the above.

  A power system interconnection monitoring device according to an aspect of the present invention is connected to another power system, and the other power system, the first power generation device derived from the first power generation, or the second power generation derived from the second power generation. A power grid interconnection monitoring device for monitoring a power system including a power storage device that supplies power supplied from the power generator of 2 to a load and stores the power, and measures power flow with the other power system Tidal power measuring means, first power measuring means for measuring power derived from the first power generation supplied from the first power generator, and the second power supplied from the second power generator. Second power measurement means for measuring power derived from power generation, charge / discharge power measurement means for measuring charge / discharge power of the power storage device, load power measurement means for measuring load power supplied to the load, The tide measured by the tidal power measuring means Electric power, electric power derived from the first electric power generation measured by the first electric power measuring means, electric power derived from the second electric power generation measured by the second electric power measuring means, measured by the charge / discharge electric power measuring means A storage power generation derived breakdown calculation means for calculating a breakdown derived from power generation of the stored power stored in the power storage device based on the charged / discharged power and the load power measured by the load power measurement means; , The tidal power measured by the tidal power measuring means, the power derived from the first power generation measured by the first power measuring means, and the second power generation measured by the second power measuring means. Derived power, the charge / discharge power measured by the charge / discharge power measurement means, the load power measured by the load power measurement means, and the stored power generation derived breakdown calculation means Based on the more breakdown from power generation of the computed the stored power, and a backward flow power generation from breakdown calculation means for calculating a breakdown from power generation of the backward flow power that flows reversely to the other electric power system.

The lineblock diagram showing the composition of the electric power system to which the electric power system interconnection monitoring device concerning a 1st embodiment of the present invention is applied. The block diagram which shows the outline | summary of the computer which comprises the power grid connection monitoring apparatus which concerns on 1st Embodiment. The flowchart which shows the process sequence by the stored electric power breakdown calculation part which concerns on 1st Embodiment. The flowchart which shows the process sequence by the reverse power flow breakdown calculation part which concerns on 1st Embodiment. The lineblock diagram showing the composition of the electric power system to which the electric power system interconnection monitoring device concerning a 2nd embodiment of the present invention is applied. The flowchart which shows the process sequence by the stored electric power breakdown calculation part which concerns on 2nd Embodiment. The flowchart which shows the process sequence by the reverse power flow breakdown calculation part which concerns on 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a configuration diagram showing a configuration of a power system to which the power system interconnection monitoring device 1 according to the first embodiment of the present invention is applied. In addition, the same code | symbol is attached | subjected to the same part in subsequent figures, the detailed description is abbreviate | omitted, and a different part is mainly described. In the following embodiments, the same description is omitted.

  The power grid to which the power grid interconnection monitoring device 1 is applied includes a commercial grid 2, two natural energy generation power generation apparatuses 4A and 4B, two power generation apparatuses 5A and 5B, and two power storage apparatuses 6A and 6B. Two power demand loads 7 </ b> A and 7 </ b> B are connected to the bus 3. This power system is provided with power detectors 8S, 8NA, 8NB, 8GA, 8GB, 8BA, 8BB, 8LA, and 8LB (hereinafter referred to as “power detectors 8S to 8LB”).

  The power grid interconnection monitoring device 1 identifies the power generation origin of the reverse power flow to the commercial grid 2 based on each active power detected by the power detectors 8S to 8LB. The power grid interconnection monitoring device 1 is composed of a computer 10.

  FIG. 2 is a configuration diagram showing an outline of the computer 10 constituting the power grid interconnection monitoring device 1 according to the present embodiment.

  The basic configuration of the computer 10 includes an input unit 91, an output unit 92, an interface 93, a calculation unit 94, a memory 95, a storage device 96, and a bus 97. The input unit 91 and the output unit 92 are connected to the bus 97 via the interface 93.

  A calculation unit 94, a memory 95, and a storage device 96 are connected to the bus 97. The input unit 91 is a keyboard or a mouse. The output unit 92 is a display or a printer. The arithmetic unit 94 is a central processing unit or a chip set. The memory 95 is a cache memory or the like for temporarily storing information for performing calculations by the calculation unit 94. The storage device 96 is a hard disk or the like for storing information.

  The commercial system 2 is, for example, a power system of an electric power company.

  The natural energy utilization power generation devices 4A and 4B are power generation devices that utilize natural energy such as solar power generation or wind power generation.

  The power generators 5A and 5B are power generators that do not use natural energy.

  The power storage devices 6A and 6B are devices that store power as energy. For example, the power storage devices 6A and 6B are secondary batteries. The power storage devices 6A and 6B discharge the stored electrical energy as necessary.

  The power demand loads 7 </ b> A and 7 </ b> B are loads that consume power supplied from the bus 3.

  The power detector 8S detects the active power (tidal power) PS supplied from the commercial system 2 to the bus 3. The power detector 8S detects the active power PS as a negative value when the power detector 8S flows backward to the commercial system 2. The power detector 8S outputs the detected active power PS to the power grid interconnection monitoring device 1.

  The power detectors 8NA and 8NB detect active power (generated power) PNA and PNB supplied to the bus 3 from the natural energy utilization power generation devices 4A and 4B, respectively. The power detectors 8NA and 8NB output the detected active power PNA and PNB to the power grid interconnection monitoring device 1.

  The power detectors 8GA and 8GB detect active power (generated power) PGA and PGB supplied to the bus 3 from the power generators 5A and 5B, respectively. The power detectors 8GA and 8GB output the detected active powers PGA and PGB to the power grid interconnection monitoring device 1.

  Power detectors 8BA and 8BB detect active power (charge / discharge power) PBA and PBB supplied to power bus 3 from power storage devices 6A and 6B, respectively. The power detectors 8BA and 8BB detect the active powers PBA and PBB as positive values when discharged. The power detectors 8BA and 8BB detect the effective powers PBA and PBB as negative values when charging. The power detectors 8BA and 8BB output the detected active powers PGA and PGB to the power grid interconnection monitoring device 1.

  The power detectors 8LA and 8LB detect active power (load power) PLA and PLB supplied from the bus 3 to the power demand loads 7A and 7B, respectively. The power detectors 8LA and 8LB output the detected active power PLA and PLB to the power grid interconnection monitoring device 1.

  The power grid interconnection monitoring device 1 includes a commercial grid power measurement value calculation unit 11, a natural energy power measurement value calculation unit 12, a power generator power measurement value calculation unit 13, a charge / discharge power measurement value calculation unit 14, and a load. A power measurement value calculation unit 15, a reverse power flow breakdown calculation unit 16, a stored power breakdown calculation unit 17, a result processing unit 18, a result output display unit 19, a data recording unit 20, and a transmission unit 21 are provided. Yes.

  The commercial grid power measurement value calculation unit 11 calculates the active power PS detected by the power detector 8S. Therefore, the active power PS is active power derived from commercial power reception. The commercial grid power measurement value calculation unit 11 calculates an average value PSv of measurement data of the active power PS in a preset time range. The commercial grid power measurement value calculation unit 11 outputs the calculated active power PS and average value PSv to the reverse power flow breakdown calculation unit 16 and the stored power breakdown calculation unit 17.

  The natural energy power measurement value calculation unit 12 calculates the total effective power PN of the active power PNA and PNB of the two natural energy utilizing power generation devices 4A and 4B detected by the two power detectors 8NA and 8NB, respectively. The active power PN is a total value of active power derived from natural energy power generation. The natural energy power measurement value calculation unit 12 calculates an average value PNv of measurement data of the active power PN in a preset time range. The natural energy power measurement value calculation unit 12 outputs the calculated active power PN and average value PNv to the reverse power flow breakdown calculation unit 16 and the stored power breakdown calculation unit 17.

  The power generation device power measurement value calculation unit 13 calculates the total effective power PG of the active power PGA and PGB of the two power generation devices 5A and 5B detected by the two power detectors 8GA and 8GB, respectively. The active power PG is a total value of active power derived from the power generation device. The power generation device power measurement value calculation unit 13 calculates an average value PGv of measurement data of the active power PG in a preset time range. The power generation device power measurement value calculation unit 13 outputs the calculated active power PG and the average value PGv to the reverse power flow breakdown calculation unit 16 and the stored power breakdown calculation unit 17.

  The charge / discharge power measurement value calculation unit 14 calculates the total effective power PB of the effective powers PBA and PBB of the two power storage devices 6A and 6B detected by the two power detectors 8BA and 8BB, respectively. The active power PB is the total value of the active power of the power storage devices 6A and 6B. The charge / discharge power measurement value calculation unit 14 calculates an average value PBv of measurement data of active power PB in a preset time range. The charge / discharge power measurement value calculation unit 14 outputs the calculated active power PB and average value PBv to the reverse power flow breakdown calculation unit 16 and the stored power breakdown calculation unit 17.

  The load power measurement value calculation unit 15 calculates the total effective power PL of the active power PLA and PLB of the two power demand loads 7A and 7B detected by the two power detectors 8LA and 8LB, respectively. The active power PL is the total value of the active power of the power demand loads 7A and 7B. The load power measurement value calculation unit 15 calculates an average value PLv of measurement data of the active power PL in a preset time range. The load power measurement value calculation unit 15 outputs the calculated active power PL and average value PLv to the reverse power flow breakdown calculation unit 16 and the stored power breakdown calculation unit 17.

  The stored power breakdown calculation unit 17 includes an active power PS and an average value PSv calculated by the commercial grid power measurement value calculation unit 11, an active power PN and an average value PNv calculated by the natural energy power measurement value calculation unit 12, and power generation The active power PG and average value PGv calculated by the device power measurement value calculation unit 13, the active power PB and average value PBv calculated by the charge / discharge power measurement value calculation unit 14, and the load power measurement value calculation unit 15 are calculated. The active power PL and the average value PLv are input.

  The stored power breakdown calculation unit 17 determines the power storage device 6A based on the active power PS, PN, PG, PB, PL for each generation of power and the average value PSv, PNv, PGv, PBv, PLv of the active power for each power generation. , 6B is calculated as a breakdown by power generation origin of the stored power and its ratio. The stored power breakdown calculation unit 17 records a breakdown of the calculated stored power by power generation origin. The stored power breakdown calculation unit 17 outputs the recorded breakdown of the stored power by power generation to the reverse power flow breakdown calculation unit 16 and the result processing unit 18 as necessary. In addition, the stored power breakdown calculation unit 17 outputs the calculation result to the result processing unit 18.

  The reverse power flow breakdown calculation unit 16 includes active power PS and average value PSv calculated by the commercial grid power measurement value calculation unit 11, active power PN and average value PNv calculated by the natural energy power measurement value calculation unit 12, power generation The active power PG and average value PGv calculated by the device power measurement value calculation unit 13, the active power PB and average value PBv calculated by the charge / discharge power measurement value calculation unit 14, and the load power measurement value calculation unit 15 are calculated. The active power PL and the average value PLv are input. The reverse power flow breakdown calculation unit 16 acquires a breakdown of the stored power by generation from the stored power breakdown calculation unit 17 as necessary.

  The reverse power flow breakdown calculation unit 16 has an active power PS, PN, PG, PB, PL for each power generation origin, an average value PSv, PNv, PGv, PBv, PLv for each power generation, and a stored power breakdown calculation unit 17. If the active power PS is in reverse power flow (PS <0) based on the breakdown by power generation derived from the stored power obtained from Calculate as a separate breakdown. The reverse flow breakdown calculation unit 16 outputs the calculated breakdown of the reverse flow for each power generation origin to the result processing unit 18. In addition, the reverse flow breakdown calculation unit 16 outputs the calculation result to the result processing unit 18.

  The result processing unit 18 includes calculation result information such as the breakdown by power generation origin of the reverse power flow calculated by the reverse power flow breakdown calculation unit 16, and the breakdown of power storage power by power generation calculated by the power storage power breakdown calculation unit 17 The calculation result information is input.

  The result processing unit 18 performs processing for matching various types of input information to the output destination format. For example, the result processing unit 18 processes a screen display format such as a monitor, a format for recording in a data recording device, or a format for information transmission. The result processing unit 18 outputs the information processed into the screen display format to the result output display unit 19. The result processing unit 18 outputs information processed into a recording format to the data recording unit 20. The result processing unit 18 outputs the information processed into the information transmission format to the transmission unit 21.

  The result output display unit 19 displays result information in accordance with the format processed by the result processing unit 18.

  The data recording unit 20 records result information and the like on the storage medium according to the format processed by the result processing unit 18.

  The transmission unit 21 transmits the result processed by the result processing unit 18 to an information transmission destination such as another computer or a server via an information network.

  FIG. 3 is a flowchart showing a processing procedure by the stored power breakdown calculation unit 17 according to the present embodiment.

  The active power PSv traded with the commercial grid 2 is theoretically the same as the sum of the active power generated on the power grid side to which the power grid interconnection monitoring device 1 is applied. Accordingly, each measured effective power PSv, PNv, PGv, PBv, and PLv theoretically has the following relationship. Here, the value of each active power is indicated by a symbol used in the figure. Similarly, in the following formulas, each active power value is appropriately indicated by a symbol.

PSv = PLv− (PNv + PGv + PBv) Formula (1)
Here, the measurement value of each active power includes an error. For this reason, the stored power breakdown calculation unit 17 calculates the value PPv on the right side of the equation (1) by the following equation.

PPv = PLv− (PNv + PGv + PBv) Equation (2)
The stored power breakdown calculation unit 17 checks whether or not the absolute value of the difference between PPv and PSv is within a preset allowable error range ε1 as shown in the following equation (step S101).

| PSv−PPv | ≦ ε1 Formula (3)
When Expression (3) does not hold, the stored power breakdown calculation unit 17 determines that any of the measured values is abnormal. When the stored power breakdown calculation unit 17 determines that there is an abnormality, the result information for notifying the measurement data abnormality is transmitted to the result processing unit 18 (Yes in step S101, step S102).

  When Expression (3) is established, the stored power breakdown calculation unit 17 proceeds to the next process (No in step S101, step S103).

  The stored power breakdown calculation unit 17 determines whether or not the power storage devices 6A and 6B are being discharged (PBv> 0) (step S103).

  When it is determined that the power storage devices 6A and 6B are discharging, the stored power breakdown calculation unit 17 calculates a breakdown according to the generation of discharge power (Yes in step S103, step S104).

  When the stored power breakdown calculation unit 17 determines that the power storage devices 6A and 6B are not discharging (charging), the process proceeds to the next process (No in step S103, step S105).

  The stored power breakdown calculation unit 17 determines whether or not a reverse power is flowing to the commercial grid 2 (PSv <0) (step S105).

  If the stored power breakdown calculation unit 17 determines that there is a reverse flow to the commercial grid 2, it calculates the breakdown of the charging power by power generation when there is no charge from the commercial grid 2 (Yes in step S 105). Step S106).

  When the stored power breakdown calculation unit 17 determines that no reverse power flow has been made to the commercial grid 2, the process proceeds to the next process (No in step S105, step S107).

  The stored power breakdown calculation unit 17 determines whether or not the load power is greater than or equal to the active power received from the commercial grid 2 (PLv ≧ PSv) (step S107).

  When the stored power breakdown calculation unit 17 determines that the load power is greater than or equal to the active power received from the commercial grid 2, the calculation of the breakdown of the charge power by power generation when there is no charge from the commercial grid 2 (step) Yes in S107, step S106).

  When the stored power breakdown calculation unit 17 determines that the load power is less than the active power received from the commercial grid 2, it calculates the breakdown of the charging power by power generation when charging from the commercial grid 2 occurs ( No in step S107, step S108).

  Next, the calculation method (step S104) of the breakdown according to the generation of discharge power will be described.

  The stored power amount WB charged in the power storage devices 6A and 6B immediately before the discharge is the sum of the charged amount WN derived from natural energy power generation, the charged amount WG derived from the power generator, and the charged amount WS derived from commercial power reception.

  These charged amounts WN, WG, WS are calculated by the stored power breakdown calculation unit 17. The discharge power PBv is shared by these charge amounts WN, WG, WS. When there are charge amounts WN, WG, WS derived from all power generations (when all of WN> 0, WG> 0, WS> 0 are satisfied), the discharge power derived from each power generation is obtained using the following equation.

PBvND = Kn × PBv Formula (4)
PBvGD = Kg × PBv Formula (5)
PBvSD = Ks × PBv Formula (6)
Here, PBvND represents the discharge power from the charge amount WN derived from natural energy power generation. PBvGD represents the discharge power from the charge amount WG derived from the power generation device. PBvSD represents the discharge power from the charge amount WS derived from commercial power reception. Kn represents a sharing coefficient derived from natural energy power generation. Kg represents a sharing coefficient derived from the power generation device. Ks represents a sharing coefficient derived from commercial power reception. These sharing coefficients Kn, Kg, and Ks are determined so that Kn + Kg + Ks = 1, Kn> 0, Kg> 0, and Ks> 0.

  Next, when one of the charged amounts WN, WG, WS derived from any power generation is zero, the sharing coefficient shared by the charged amount derived from the power generation, which is zero, is set to zero. The sharing coefficient that is shared by the charge amount derived from non-zero power generation is uniformly corrected so that the total of these sharing coefficients is 1.

  For example, it is assumed that preset sharing coefficients Kn, Kg, and Ks are Kn = 0.3, Kg = 0.5, and Ks = 0.2, respectively, and the charging amount WS derived from commercial power reception becomes zero. . In this case, the stored power breakdown calculation unit 17 sets the distribution coefficient Ks derived from commercial power reception to zero. The remaining sharing coefficients Kn and Kg are corrected using the following equations.

Kn1 = Kn + Ks × Kn / (Kn + Kg) Equation (7)
Kg1 = Kg + Ks × Kg / (Kn + Kg) Formula (8)
Here, Kn1 represents a shared coefficient derived from the corrected natural energy power generation. Kg1 represents a shared coefficient derived from the power generator after correction.

  Thus, the corrected sharing coefficients are Kn1 = 0.375 and Kg1 = 0.625.

  The sharing coefficient Kn1 is substituted into the sharing coefficient Kn in the equation (4) to calculate the discharge power PBvND derived from natural energy power generation. The sharing coefficient Kg1 is substituted for the sharing coefficient Kg in the equation (5) to calculate the discharge power PBvGD derived from the power generator. In addition, since the sharing coefficient Ks is zero, the discharge power PBvSD derived from commercial power reception is also zero according to the equation (6).

  Based on the calculated discharge power PBvND, PBvGD, and PBvSD derived from each power generation, the stored power breakdown calculation unit 17 calculates a breakdown of the stored power amount WB of the power storage devices 6A and 6B after discharge by power generation. Specifically, as shown in the following equation, the value obtained by integrating the discharge time ΔTd to the discharge power PBvND, PBvGD, PBvSD derived from each power generation is subtracted from the charge amounts WN, WG, WS derived from each power generation before discharging. .

WNn = WN−PBvND × ΔTd Equation (9)
WGn = WG-PBvGD × ΔTd Formula (10)
WSn = WS−PBvSD × ΔTd Formula (11)
Here, WNn represents the amount of charge derived from natural energy power generation after discharge. WGn represents the amount of charge derived from the power generation device after discharging. WSn represents the amount of charge derived from commercial power reception after discharge. At this time, when WBn is the charge amount of the power storage devices 6A and 6B after discharging, the following equation is established.

WBn = WNn + WGn + WSn Formula (12)
Next, the calculation method (step S106) of the breakdown according to generation of charging power when there is no charging from the commercial system 2 will be described.

  The state of the power system when this calculation method is performed is that the natural power generation power generation devices 4A and 4B and the power generation devices 5A and 5B receive active power PSv of the commercial system 2 from the active power PLv to the power demand loads 7A and 7B. (In the case of reverse flow, the active power (PLv−PSv) of the difference obtained by subtracting PSv <0) is shared. Therefore, the power storage devices 6A and 6B are charged with surplus power from the natural energy utilization power generation devices 4A and 4B and the power generation devices 5A and 5B. In this case, the breakdown by power generation derived from the charging power of the power storage devices 6A and 6B is obtained using the following equation.

PBvNC = PNv−Kn × (PLv−PSv) Formula (13)
PBvGC = PGv−Kg × (PLv−PSv) Formula (14)
Here, PBvNC represents charging power from the power storage devices 6A and 6B. PBvGC represents the charging power from the power generators 5A and 5B. Kn represents a sharing coefficient derived from natural energy power generation. Kg represents a sharing coefficient derived from the power generation device. These sharing coefficients Kn and Kg are determined so that Kn + Kg = 1, Kn> 0, and Kg> 0.

  Based on the calculated charging power PBvNC and PBvGC derived from each power generation, the stored power breakdown calculation unit 17 calculates a breakdown of the stored power amounts of the power storage devices 6A and 6B after charging by power generation. Specifically, as shown in the following equation, the stored power breakdown calculation unit 17 adds the charging time ΔTc to the charging power PBvNC and PBvGC derived from each power generation to the charging amounts WN and WG derived from each power generation before charging, respectively. Add the values.

WNn = WN + PBvNC × ΔTc Equation (15)
WGn = WG + PBvGC × ΔTc Equation (16)
Here, WNn represents the amount of charge derived from natural energy power generation after charging. WGn represents the amount of charge derived from the power generator after charging. At this time, if WBn is the charge amount of the power storage devices 6A and 6B after charging and WS is the charge amount derived from commercial power reception, the following equation is established.

WBn = WNn + WGn + WS Formula (17)
Next, the calculation method (step S108) of the breakdown according to the generation of the charging power when the commercial system 2 is charged will be described.

  The state of the power system when this calculation method is performed is a state in which the power storage devices 6A and 6B are charged by surplus power of the natural energy utilization power generation devices 4A and 4B, the power generation devices 5A and 5B, and the commercial system 2. It is. At this time, the power storage devices 6A and 6B are all the generated power of the natural energy generation power generation devices 4A and 4B and the power generation devices 5A and 5B, and the effective power of the power demand loads 7A and 7B from the received active power PSv of the commercial system 2. The effective power (PSv−PLv) of the difference obtained by subtracting from PLv is charged. In this case, the breakdown by power generation derived from the charging power of the power storage devices 6A and 6B is obtained using the following equation.

PBvNC = PNv Formula (18)
PBvGC = PGv Formula (19)
PBvSC = PSv-PLv Formula (20)
Based on the calculated charging power PBvNC, PBvGC, and PBvSC derived from each power generation, the stored power breakdown calculation unit 17 calculates the breakdown of the stored power amounts of the power storage devices 6A and 6B after charging by power generation. Specifically, as shown in the following equation, the stored power breakdown calculation unit 17 charges the charging power PBvNC, PBvGC, and PBvGC derived from each power generation to the charging amounts WN, WG, WS derived from each power generation before charging. A value obtained by integrating the time ΔTc is added.

WNn = WN + PBvNC × ΔTc Equation (21)
WGn = WG + PBvGC × ΔTc Equation (22)
WSn = WS + PBvSC × ΔTc Equation (23)
Here, WNn represents the amount of charge derived from natural energy power generation after charging. WGn represents the amount of charge derived from the power generator after charging. WSn represents the amount of charge derived from commercial power reception after charging.

  At this time, when WBn is the charge amount of the power storage devices 6A and 6B after charging, the following equation is established.

WBn = WNn + WGn + WSn Formula (24)
FIG. 4 is a flowchart showing a processing procedure by the reverse power flow breakdown calculation unit 16 according to the present embodiment.

  The measured active powers PSv, PNv, PGv, PBv, and PLv theoretically hold the following relationship.

PSv = PLv− (PNv + PGv + PBv) Formula (25)
Here, the measurement value of each active power includes an error. Therefore, the reverse power flow breakdown calculation unit 16 calculates the value PPv on the right side of the equation (25) by the following equation.

PPv = PLv− (PNv + PGv + PBv) Equation (26)
The reverse power flow breakdown calculation unit 16 checks whether or not the absolute value of the difference between PPv and PSv is within a preset allowable error range ε1 as shown in the following equation (step S201).

| PSv−PPv | ≦ ε1 Formula (27)
When Expression (27) does not hold, the reverse power flow breakdown calculation unit 16 determines that any of the measurement values is abnormal. When determining that there is an abnormality, the reverse power flow breakdown calculation unit 16 transmits result information for notifying the measurement data abnormality to the result processing unit 18 (Yes in step S201, step S202).

  When Expression (27) is satisfied, the reverse power flow breakdown calculation unit 16 proceeds to the next process (No in Step S201, Step S203).

  The reverse flow breakdown calculation unit 16 determines whether or not the reverse flow is flowing to the commercial grid 2 (PSv <0) (step S203).

  When the reverse flow breakdown calculation unit 16 determines that the reverse flow does not flow into the commercial system 2 (PSv ≦ 0), the reverse flow flow is notified to the result processing unit 18 (No in step S203, step S204). ).

  If the reverse flow breakdown calculation unit 16 determines that the reverse flow is flowing into the commercial system 2, the process proceeds to the next process (Yes in step S203, step S205).

  The reverse power flow breakdown calculation unit 16 determines whether or not the power storage devices 6A and 6B are being discharged (PBv> 0) (step S205).

  When it is determined that the power storage devices 6A and 6B are discharging, the reverse flow breakdown calculation unit 16 calculates the breakdown of the reverse flow depending on the generation of power when there is discharge power (Yes in step S205, step S206). ).

  When the reverse power flow breakdown calculation unit 16 determines that the power storage devices 6A and 6B are not discharging (charging), the reverse power flow calculation unit 16 calculates a breakdown by power generation origin of the reverse power flow when there is no discharge power (step S205). No, step S207).

  Next, the calculation method (step S206) of the breakdown according to the power generation origin of the reverse power flow when there is discharge power will be described.

  The state of the power system when performing this calculation method is a state in which there is a reverse power flow (PSv <0) and the power storage devices 6A and 6B are being discharged (PBv> 0).

  Since there is a reverse power flow, the following equation holds from Equation (25).

PLv <PNv + PGv + PBv Formula (28)
Further, since the power storage devices 6A and 6B are being discharged (PBv> 0), the power demand loads 7A, 4A and 4B, the power generation devices 5A and 5B, and the power storage devices 6A and 6B The effective power PLv to 7B is shared. In addition, surplus power for power supply to the power demand loads 7 </ b> A and 7 </ b> B flows backward to the commercial system 2.

  The reverse power flow breakdown calculation unit 16 receives the discharge power PBvND, PBvGD, PBvSD derived from each power generation of the power storage devices 6A, 6B from the stored power breakdown calculation unit 17. The reverse power flow breakdown calculation unit 16 obtains a breakdown of the active power supplied to the power system by the power generation origin using the following equation.

PNt = PNv + PBvND Formula (29)
PGt = PGv + PBvGD Formula (30)
PSt = PBvSD Formula (31)
Here, PNt represents total active power derived from natural energy power generation. PGt represents the total active power derived from the power generator. PSt represents the total active power derived from commercial power reception.

  The reverse power flow breakdown calculation unit 16 obtains a breakdown of the reverse power flow by power generation based on the calculated total active power PNt, PGt, PSt derived from each power generation. Specifically, it is assumed that the power supply to the power demand loads 7A and 7B is shared at a ratio determined in advance for each generation of power generation, and the surplus power is reverse power flow. Under this condition, the reverse flow breakdown calculation unit 16 obtains a breakdown of the reverse flow power by power generation origin. The breakdown of the reverse flow power by power generation by this calculation method is as follows.

PSvN = PNt−Ksn × PLv Equation (32)
PSvG = PGt−Ksg × PLv Formula (33)
PSvS = PSt−Kss × PLv Equation (34)
Here, PSvN represents reverse flow power derived from natural energy power generation. PSvG represents the reverse power flow derived from the power generation device. PSvS represents the reverse power flow derived from stored commercial power. Ksn represents a sharing coefficient derived from natural energy power generation. Ksg represents a sharing coefficient derived from the power generation device. Kss represents a sharing coefficient derived from commercial power reception. These sharing coefficients Ksn, Ksg, and Kss are determined so that Ksn + Ksg + Kss = 1, Ksn> 0, Ksg> 0, and Kss> 0.

  When the reverse flow power derived from any power generation is zero, the sharing coefficients Ksn, Ksg, as well as the correction of the sharing coefficients Kn, Kg, Ks when the stored power breakdown calculation unit 17 calculates the discharge power derived from each power generation, Correct Kss.

  Next, a calculation method (step S207) of breakdown according to power generation origin of reverse power flow when there is no discharge power will be described.

  The state of the power system when this calculation method is performed is a state where there is a reverse power flow (PSv <0) and charging (PBv <0).

  Since the power storage devices 6A and 6B are being charged and are flowing backward to the commercial grid 2, the natural energy-based power generation devices 4A and 4B and the power generation devices 5A and 5B are effective for the power demand loads 7A and 7B. This means that the power PLv is shared and the power storage devices 6A and 6B are charged. Therefore, the reverse power flow to the commercial grid 2 becomes surplus power of the power supplied to the power demand loads 7A and 7B and the power storage devices 6A and 6B.

  The reverse power flow breakdown calculation unit 16 receives charging power PBvNC and PBvGC derived from each power generation of the power storage devices 6A and 6B from the stored power breakdown calculation unit 17. The reverse power flow breakdown calculation unit 16 subtracts the charging power PBvNC and PBvGC derived from each power generation from the supplied power PNv and PGv derived from each power generation, and obtains a breakdown according to the power generation derived from the active power supplied in the power system. . This calculation is expressed by the following equation.

PNt = PNv−PBvNC Formula (35)
PGt = PGv−PBvGC Formula (36)
Here, PNt represents total active power derived from natural energy power generation. PGt represents the total active power derived from the power generator.

  The reverse power flow breakdown calculation unit 16 obtains a breakdown of the reverse power flow by power generation based on the calculated total active powers PNt and PGt derived from each power generation. Specifically, it is assumed that the power supply to the power demand loads 7A and 7B is shared at a ratio determined in advance for each generation of power generation, and the surplus power is reverse power flow. Under this condition, the reverse flow breakdown calculation unit 16 obtains a breakdown of the reverse flow power by power generation origin. The breakdown of the reverse flow power by power generation by this calculation method is as follows.

PSvN = PNt−Ksn × PLv Formula (37)
PSvG = PGt−Ksg × PLv Formula (38)
Here, Ksn represents a sharing coefficient derived from natural energy power generation. Ksg represents a sharing coefficient derived from the power generation device. These sharing coefficients Ksn and Ksg are determined so that Ksn + Ksg = 1, Ksn> 0, and Ksg> 0.

  According to the present embodiment, by measuring the effective power for each power generation in the power system, the breakdown by power generation of the stored power amount of the power storage devices 6A and 6B and the power generation from the reverse power flow to the commercial system 2 Another breakdown can be calculated.

  Accordingly, the power grid interconnection monitoring device 1 is applied in a power grid system including a plurality of types of power generators 4A, 4B, 5A, 5B, power storage devices 6A, 6B, and power demand loads 7A, 7B. Thus, the power generation origin of the reverse flow power to the commercial system 2 can be identified.

(Second Embodiment)
FIG. 5: is a block diagram which shows the structure of the electric power system with which 1 A of electric power grid connection monitoring apparatuses which concern on the 2nd Embodiment of this invention are applied.

  In the power grid interconnection monitoring apparatus 1 according to the first embodiment shown in FIG. 1, the power grid interconnection monitoring apparatus 1A includes a reverse power flow breakdown calculation section 16 and a stored power breakdown calculation section 17 as a reverse power flow breakdown calculation section 16A. And the storage power breakdown calculation unit 17A. About another point, 1 A of electric power grid connection monitoring apparatuses are the same as that of 1st Embodiment.

  FIG. 6 is a flowchart showing a processing procedure by the stored power breakdown calculation unit 17A according to the present embodiment.

  The processing procedure by the stored power breakdown calculation unit 17A is the same as the processing procedure by the storage power breakdown calculation unit 17A according to the first embodiment shown in FIG. This is a procedure in place of the processing content. About the other point, the process sequence by the stored electric power breakdown calculation part 17A is the same as that of 1st Embodiment.

  Next, the calculation method (step S104A) of the breakdown by discharge power generation origin will be described.

  The stored power amount WB charged in the power storage devices 6A and 6B immediately before the discharge is the sum of the charged amount WN derived from natural energy power generation, the charged amount WG derived from the power generator, and the charged amount WS derived from commercial power reception. These charged amounts WN, WG, WS are calculated by the stored power breakdown calculation unit 17A.

  The discharge power PBv is shared by these charge amounts WN, WG, WS. The discharge power derived from each power generation is obtained by switching in the order of priority derived from power generation set in advance and discharging until the charge amount derived from each power generation sequentially becomes zero. Here, the order of priority is derived from natural energy power generation, power generation device, and commercial power reception. In this method, the following three equations are sequentially calculated until the amount of charge derived from each power generation becomes zero.

WNn = WN−PBv × ΔTd1 Formula (39)
WGn = WG−PBv × ΔTd2 Formula (40)
WSn = WS−PBv × ΔTd3 Formula (41)
Here, WNn represents the amount of charge derived from natural energy power generation after discharge. WGn represents the amount of charge derived from the power generation device after discharging. WSn represents the amount of charge derived from commercial power reception after discharge.

  At this time, when WBn is the charge amount of the power storage devices 6A and 6B after discharging, the following equation is established.

WBn = WNn + WGn + WSn Formula (42)
Further, ΔTd1 represents a time during which the stored power derived from natural energy power generation is discharged (a time until the charge amount becomes zero). ΔTd2 represents the time during which the stored power derived from the power generator is discharged. ΔTd3 represents the time during which the stored power derived from commercial power reception is being discharged.

  At this time, if the discharge time of the power storage devices 6A and 6B is ΔTd, the following equation holds.

ΔTd = ΔTd1 + ΔTd2 + ΔTd3 Formula (43)
That is, the calculation procedure by the stored power breakdown calculation unit 17A is as follows.

  The stored power breakdown calculation unit 17A performs calculation according to Expression (39) until the amount of charge WN derived from natural energy power generation becomes zero (until the discharge time ΔTd1 elapses from the start of discharge). When the discharge time ΔTd elapses before the charge amount WN derived from natural energy power generation becomes zero (ΔTd1 = ΔTd), the stored power breakdown calculation unit 17A ends the calculation. If the discharge time ΔTd has not elapsed (ΔTd1 <ΔTd) even if the charge amount WN derived from natural energy power generation becomes zero, the stored power breakdown calculation unit 17A performs the following calculation.

  After the discharge time ΔTd1 derived from the natural energy power generation has elapsed, the stored power breakdown calculation unit 17A determines that the amount of charge WG derived from the power generator becomes zero (until the discharge time ΔTd2 elapses after the discharge time ΔTd1 elapses). ). When the discharge time ΔTd elapses before the charge amount WG derived from the power generation device becomes zero (ΔTd1 + ΔTd2 = ΔTd), the stored power breakdown calculation unit 17A ends the calculation. If the discharge time ΔTd has not elapsed even when the charging amount WG derived from the power generation device becomes zero (ΔTd1 + ΔTd2 <ΔTd), the stored power breakdown calculation unit 17A performs the following calculation.

  After the discharge time ΔTd2 derived from the power generation device has elapsed, the stored power breakdown calculation unit 17A performs the calculation according to the equation (41) until the discharge time ΔTd3 has elapsed.

  After the elapse of the discharge time ΔTd, the stored power breakdown calculation unit 17A uses the calculated charge amounts WNn, WGn, WSn derived from the respective power generations according to the power generation origins of the stored power amounts WBn of the power storage devices 6A, 6B after the discharge. Record as a breakdown.

  Next, the calculation method (step S106A) of the breakdown according to the generation of charging power when there is no charging from the commercial system 2 will be described.

  The state of the power system when this calculation method is performed is that the natural power generation power generation devices 4A and 4B and the power generation devices 5A and 5B receive active power PSv of the commercial system 2 from the active power PLv to the power demand loads 7A and 7B. (In the case of reverse flow, the active power (PLv−PSv) of the difference obtained by subtracting PSv <0) is shared. Therefore, the power storage devices 6A and 6B are charged with surplus power from the natural energy utilization power generation devices 4A and 4B and the power generation devices 5A and 5B.

  The stored power breakdown calculation unit 17A calculates that the power storage devices 6A and 6B are preferentially charged with the active power PNv by the natural energy generation power generation devices 4A and 4B. In this case, the breakdown by power generation derived from the charging power of the power storage devices 6A and 6B is obtained using the following equation.

When PGv ≧ (PLv−PSv),
PBvNC = PNv Formula (44)
PBvGC = PGv− (PLv−PSv) Formula (45)
When PGv <(PLv−PSv),
PBvNC = PNv + PGv− (PLv−PSv) Equation (46)
PBvGC = 0 Formula (47)
Here, PBvNC represents charging power from the power storage devices 6A and 6B. PBvGC represents the charging power from the power generators 5A and 5B.

  The stored power breakdown calculation unit 17A uses the equations (15) and (16) to store the power after charging based on the calculated charging power PBvNC and PBvGC derived from each power generation, as in the first embodiment. The breakdown by power generation of the amount of stored power WBn of the devices 6A and 6B is calculated.

  FIG. 7 is a flowchart showing a processing procedure by the reverse power flow breakdown calculation unit 16A according to the present embodiment.

  The processing procedure by the reverse flow breakdown calculation unit 16A is the same as the processing procedure by the reverse flow breakdown calculation unit 16A according to the first embodiment shown in FIG. This is a procedure in place of the processing content of S206A and step S207A. Regarding other points, the processing procedure by the reverse flow breakdown calculation unit 16A according to the present embodiment is the same as that of the first embodiment.

  Next, the calculation method (step S206A) of the breakdown according to the power generation origin of the reverse power flow when there is discharge power will be described.

  The state of the power system when performing this calculation method is a state in which there is a reverse power flow (PSv <0) and the power storage devices 6A and 6B are being discharged (PBv> 0).

  Since the power storage devices 6A and 6B are being discharged (PBv> 0), the natural energy utilization power generation devices 4A and 4B, the power generation devices 5A and 5B, and the power storage devices 6A and 6B reach the power demand loads 7A and 7B. Active power PLv is shared. In addition, surplus power for power supply to the power demand loads 7 </ b> A and 7 </ b> B flows backward to the commercial system 2.

  Similarly to the first embodiment, the reverse power flow breakdown calculation unit 16 calculates the total active power PNt, PGt, PSt derived from each power generation calculated using the equations (29), (30), and (31). Based on this, the breakdown of the reverse power flow by power generation is obtained. Specifically, the reverse power flow breakdown calculation unit 16 obtains a breakdown of the reverse power flow by power generation, assuming that active power from a preset power generation is preferentially supplied as reverse power flow. Here, the active power PNt derived from natural energy power generation is preferentially set as reverse power flow power. The breakdown by power generation origin of reverse power flow by this calculation method is obtained using the following equation.

When PGt + PSt ≧ PLv PSvN = PNt Formula (48)
PSvG = PGt−Ksg × PLv Formula (49)
PSvS = PSt−Kss × PLv Formula (50)
When PGt + PSt <PLv PSvN = PNt + PGt + PSt−PLv Equation (51)
PSvG = 0 Formula (52)
PSvS = 0 Formula (53)
Here, PSvN represents reverse flow power derived from natural energy power generation. PSvG represents the reverse power flow derived from the power generation device. PSvS represents the reverse power flow derived from stored commercial power. Ksg represents a sharing coefficient derived from the power generation device. Kss represents a sharing coefficient derived from commercial power reception. These sharing coefficients Ksg and Kss are determined so that Ksg + Kss = 1, Ksg> 0, and Kss> 0.

  Next, the calculation method (step S207A) of the breakdown according to the power generation origin of the reverse power flow when there is no discharge power will be described.

  The state of the power system when this calculation method is performed is a state where there is a reverse power flow (PSv <0) and charging (PBv <0).

  Since the power storage devices 6A and 6B are being charged and are flowing backward to the commercial grid 2, the natural energy-based power generation devices 4A and 4B and the power generation devices 5A and 5B are effective for the power demand loads 7A and 7B. This means that the power PLv is shared and the power storage devices 6A and 6B are charged. Therefore, the reverse power flow to the commercial grid 2 becomes surplus power of the power supplied to the power demand loads 7A and 7B and the power storage devices 6A and 6B.

  Similarly to the first embodiment, the reverse flow breakdown calculation unit 16 generates the reverse flow power based on the total active powers PNt and PGt derived from each power generation calculated using the equations (35) and (36). Find a breakdown by origin. Specifically, the reverse power flow breakdown calculation unit 16 obtains a breakdown of the reverse power flow by power generation, assuming that active power from a preset power generation is preferentially supplied as reverse power flow. Here, the active power PNt derived from natural energy power generation is preferentially set as reverse power flow power. The breakdown by power generation origin of reverse power flow by this calculation method is obtained using the following equation.

When PGt ≧ PLv PSvN = PNt Formula (54)
PSvG = PGt-PLv Formula (55)
When PGt <PLv PSvN = PNt + PGt−PLv Formula (56)
PSvG = 0 Formula (57)
Here, PSvN represents reverse flow power derived from natural energy power generation. PSvG represents the reverse power flow derived from the power generation device.

  According to this embodiment, the same effect as that of the first embodiment can be obtained.

  In addition, it is possible to calculate the breakdown of the reverse power flow by power generation, with the active power derived from power generation set in advance as the reverse power flow. Therefore, by arbitrarily setting the power generation origin to be set, it is possible to make a power trading transaction suitable for the demands of the power selling side (for example, general consumers) or the power purchasing side (for example, the power company). .

  The computer 10 constituting the power grid interconnection monitoring device 1 may be of any model and configuration. The computer 10 may be a personal computer or a microcomputer. The input unit 91 and the output unit 92 may be devices having both functions. The parts constituting the computer may be any combination of software and hardware.

  In each embodiment, although the secondary battery was demonstrated as an apparatus which stores electric power, it is not restricted to this. As long as electricity can be stored as energy and the stored energy can be supplied as electricity, any method may be used for storing electric power. Therefore, it may be a device that converts electricity into kinetic energy, potential energy, thermal energy, or the like and stores it.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 1 ... Electric power grid connection monitoring apparatus, 2 ... Commercial system, 3 ... Bus, 4A, 4B ... Natural energy utilization power generation device, 5A, 5B ... Power generation device, 6A, 6B ... Power storage device, 7A, 7B ... Power demand load , 8S, 8NA, 8NB, 8GA, 8GB, 8BA, 8BB, 8LA, 8LB ... power detector, 11 ... commercial power measurement value calculation unit, 12 ... natural energy power measurement value calculation unit, 13 ... power generation device power measurement value Calculation unit, 14 ... Charge / discharge power measurement value calculation unit, 15 ... Load power measurement value calculation unit, 16 ... Reverse power flow breakdown calculation unit, 17 ... Storage power breakdown calculation unit, 18 ... Result processing unit, 19 ... Result output display unit , 20 ... data recording unit, 21 ... transmission unit.

Claims (8)

Linked with another power system, supplying power supplied from the other power system, the first power generation device derived from the first power generation, or the second power generation device derived from the second power generation to the load, A power grid interconnection monitoring device for monitoring a power grid including a power storage device for storing power,
Tidal power measuring means for measuring tidal power with the other power system;
First power measuring means for measuring power derived from the first power generation supplied from the first power generation device;
Second power measuring means for measuring the power derived from the second power generation supplied from the second power generation device;
Charge / discharge power measuring means for measuring charge / discharge power of the power storage device;
Load power measuring means for measuring load power supplied to the load;
The tidal power measured by the tidal power measuring means, the power derived from the first power generation measured by the first power measuring means, and derived from the second power generation measured by the second power measuring means Of power stored in the power storage device based on the power of the power, the charge / discharge power measured by the charge / discharge power measurement means, and the load power measured by the load power measurement means A storage power generation-derived breakdown calculation means for calculating
The tidal power measured by the tidal power measuring means, the power derived from the first power generation measured by the first power measuring means, and derived from the second power generation measured by the second power measuring means Power, the charge / discharge power measured by the charge / discharge power measurement means, the load power measured by the load power measurement means, and the power generation derived from the stored power calculated by the power storage power generation breakdown calculation means A power grid interconnection monitoring device, comprising: a reverse power flow power generation-derived breakdown calculation means for calculating a breakdown derived from power generation of reverse flow power flowing backward to the other power system based on the breakdown of the power flow. The power derived from the first power generation measured by the first power measuring means, the power derived from the second power generation measured by the second power measuring means, and measured by the charge / discharge power measuring means. System power calculation means for calculating system power that is the difference between the total power with the charge / discharge power and the load power measured by the load power measurement means;
Difference calculating means for calculating a difference between the tidal power measured by the tidal power measuring means and the power on the grid calculated by the grid power calculating means;
The power grid interconnection monitoring apparatus according to claim 1, further comprising: an abnormality determination unit that determines that an abnormality is detected when the difference calculated by the difference calculation unit is not within a predetermined range. 2. The power grid link according to claim 1, wherein the stored power generation derived breakdown calculation unit calculates a breakdown that shares a large amount of power derived from power generation that is prioritized according to a predetermined priority order. System monitoring device. The power grid interconnection monitoring device according to claim 1, wherein the storage power generation-derived breakdown calculation means calculates a breakdown of sharing the storage power according to a sharing ratio determined in advance for each generation of power generation. 2. The power according to claim 1, wherein the reverse flow power generation-derived breakdown calculation unit calculates a breakdown that largely shares the power derived from the power generation that is given priority to the reverse flow power according to a predetermined priority order. Grid connection monitoring device. 2. The power grid interconnection monitoring device according to claim 1, wherein the reverse flow power generation-derived breakdown calculation unit calculates a breakdown of sharing the reverse flow power according to a sharing ratio determined in advance for each generation of power generation. . Linked with another power system, supplying power supplied from the other power system, the first power generation device derived from the first power generation, or the second power generation device derived from the second power generation to the load, A power grid interconnection monitoring method for monitoring a power grid provided with a power storage device for storing power,
Measuring tidal power with the other power system;
Measuring the power derived from the first power generation supplied from the first power generation device;
Measuring the power derived from the second power generation supplied from the second power generation device;
Measuring charge / discharge power of the power storage device;
Measuring load power supplied to the load;
Based on the measured tidal power, the measured power from the first power generation, the measured power from the second power generation, the measured charge / discharge power, and the measured load power, Calculating a breakdown derived from power generation of the stored power stored in the power storage device;
The measured tidal current power, the measured power derived from the first power generation, the measured power derived from the second power generation, the measured charge / discharge power, the measured load power, and the calculated A power system interconnection monitoring method comprising: calculating a breakdown derived from power generation of reverse flow power flowing backward to the other power system based on a breakdown derived from power generation of the stored power. Linked with another power system, supplying power supplied from the other power system, the first power generation device derived from the first power generation, or the second power generation device derived from the second power generation to the load, A power grid interconnection monitoring program for monitoring a power grid equipped with a power storage device for storing power,
Computer
Tidal power measuring means for measuring tidal power with the other power system;
First power measuring means for measuring power derived from the first power generation supplied from the first power generation device;
Second power measuring means for measuring the power derived from the second power generation supplied from the second power generation device;
Charge / discharge power measuring means for measuring charge / discharge power of the power storage device;
Load power measuring means for measuring load power supplied to the load;
The tidal power measured by the tidal power measuring means, the power derived from the first power generation measured by the first power measuring means, and derived from the second power generation measured by the second power measuring means Of power stored in the power storage device based on the power of the power, the charge / discharge power measured by the charge / discharge power measurement means, and the load power measured by the load power measurement means A storage power generation-derived breakdown calculation means for calculating
The tidal power measured by the tidal power measuring means, the power derived from the first power generation measured by the first power measuring means, and derived from the second power generation measured by the second power measuring means Power, the charge / discharge power measured by the charge / discharge power measurement means, the load power measured by the load power measurement means, and the power generation derived from the stored power calculated by the power storage power generation breakdown calculation means A power grid interconnection monitoring program for functioning as a reverse flow power generation derived breakdown calculation means for calculating a breakdown derived from the generation of reverse flow power that flows backward to the other power system based on the breakdown.

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