WO2014196364A1 - 電力安定化システムおよび制御装置 - Google Patents
電力安定化システムおよび制御装置 Download PDFInfo
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- WO2014196364A1 WO2014196364A1 PCT/JP2014/063506 JP2014063506W WO2014196364A1 WO 2014196364 A1 WO2014196364 A1 WO 2014196364A1 JP 2014063506 W JP2014063506 W JP 2014063506W WO 2014196364 A1 WO2014196364 A1 WO 2014196364A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Definitions
- the present invention relates to a power stabilization system and a control device.
- the frequency fluctuation can be suppressed by increasing the frequency adjustment capacity by governor-free control by adding a rotating machine.
- the power generation efficiency is reduced by the amount of operation of the generator at an output lower than the rated output for frequency adjustment by the governor-free control.
- the reduction effect of carbon dioxide emissions due to the introduction of natural energy is offset by that amount.
- Patent Document 1 discloses a frequency fluctuation suppressing device that suppresses fluctuations in the system frequency of the power system by absorbing or discharging power using a flywheel generator motor as a power storage device.
- a distributed power source such as a wind power generator or a solar cell
- the power generation output of a distributed power source increases, it can be connected to the power system by reducing the discharge of power by the power storage device or increasing the absorption of power. Frequency fluctuations at the system point can be suppressed.
- the power generation output of the distributed power supply decreases, the frequency fluctuation at the connection point to the power system is suppressed by reducing the absorption of power by the power storage device or increasing the discharge of power. Can do.
- power storage devices such as flywheel generator motors and secondary batteries, and power converters that convert power absorbed or released by the power storage device are controlled assuming that the system frequency characteristic constant K hardly changes.
- a constant is determined. Therefore, in a weak power system such as a remote place or a remote island where the system frequency characteristic constant K may change greatly, the compensation control by the power storage device may be in a state of insufficient compensation or overcompensation.
- frequency fluctuation larger than expected may occur temporarily.
- the control constants of the power storage device and the power converter are fixed, sufficient compensation is not performed, and the system frequency may deviate from the target range.
- the main present invention that solves the above-described problems is a power stabilization system that suppresses fluctuations in the active power of an AC power system, and stores power and absorbs or releases power with the AC power system.
- a storage device a power converter that mutually converts power absorbed or released between the AC power system and the power storage device; and the power converter is controlled in accordance with an active power fluctuation of the AC power system
- a control device that extracts a fluctuation component of the system frequency based on the frequency detection unit that detects a system frequency of the AC power system as a frequency measurement value, and the frequency measurement value.
- a frequency fluctuation compensation calculation unit that obtains an electric energy for compensating the extracted fluctuation component as a frequency fluctuation compensation amount, and a dead band set for the system frequency based on the measured frequency value.
- a frequency deviation compensation calculating unit that extracts a deviation amount from which the system frequency has deviated and obtains a power deviation amount that compensates for the extracted deviation amount as a frequency deviation compensation amount, and adds the frequency fluctuation compensation amount and the frequency deviation compensation amount.
- a power converter control unit that controls the power converter according to the frequency compensation amount.
- the other main present invention that solves the above-mentioned problems is a power stabilization system that suppresses fluctuations in the active power of an AC power system, and stores power and absorbs power with the AC power system or A power storage device that performs discharge, a power converter that mutually converts power absorbed or released between the AC power system and the power storage device, and the power according to fluctuations in active power of the AC power system
- a control device for controlling the converter, wherein the control device detects a power flow of the AC power system as a power flow measurement value, and the power flow based on the power flow measurement value.
- a power flow fluctuation compensation calculation unit for obtaining a power flow fluctuation compensation amount as a power flow fluctuation compensation amount, and the power flow based on the measured power flow value.
- a power flow deviation compensation calculating unit that extracts a deviation amount from which the power flow has deviated from a defined dead zone and obtains a power amount that compensates for the extracted deviation amount as a power flow deviation compensation amount; and A power flow compensation calculation unit that obtains a power flow compensation amount by adding the power flow deviation compensation amount, and a power converter control unit that controls the power converter according to the power flow compensation amount.
- FIG. 1 It is a schematic diagram which shows an example of the suppression operation of the frequency variation by the control apparatus in 1st Embodiment of this invention. It is a block diagram which shows the structure of the control apparatus in 2nd Embodiment of this invention. It is a block diagram which shows the structure of the control apparatus in 3rd Embodiment of this invention. It is a block diagram which shows the structure of the control apparatus in 4th Embodiment of this invention. It is a figure explaining the setting method of the proportional gain Kff in the proportional gain setting part 1143.
- FIG. It is a block diagram which shows the structure of the control apparatus in 5th Embodiment of this invention. It is a figure explaining the setting method of the proportional gain Kff in the proportional gain setting part 1144.
- FIG. It is a block diagram which shows the structure of the control apparatus in 6th Embodiment of this invention. It is a block diagram which shows the structure of the state monitoring part in 6th Embodiment of this invention.
- FIG. 1 and FIG. 2 the structure of the power stabilization system provided with the control apparatus in the 1st thru
- the power line is indicated by a solid line
- the signal line is indicated by a broken line.
- the power stabilization system 1 shown in FIG. 1 is a system for suppressing the active power fluctuation of the AC power system 9, especially the fluctuation of the system frequency.
- the AC power system 9 as a distributed power source using natural energy, for example, a solar cell module 50 installed in the solar power plant 5 and a wind power generator 60 installed in the wind power plant 6 are respectively power converters. Interconnected via 51 and 61.
- a generator (not shown) of another power plant 7 is also connected to the AC power system 9.
- the other power plants 7 may include thermal power plants, nuclear power plants, hydroelectric power plants and the like that are not accompanied by output fluctuations due to natural conditions such as wind speed and weather.
- a consumer load 8 is connected to the AC power system 9.
- the power stabilization system 1 includes a control device 10, an instrument transformer 15, a power storage device 20, and a power converter 21.
- the power storage device 20 is linked to the AC power system 9 via the power converter 21.
- the power storage device 20 has the capability of storing power and absorbing or discharging power with the AC power system 9 regardless of the type, such as a flywheel generator motor or a secondary battery. Just do it.
- the power converter 21 has a function of mutually converting power absorbed / released between the AC power system 9 and the power storage device 20.
- the control device 10 is connected to the AC power system 9 via an instrument transformer 15.
- system information indicating the state of the AC power system 9 is input to the control device 10.
- the control apparatus 10 suppresses the active power fluctuation
- the power converter 21 is controlled accordingly.
- FIG. 2 shows an example of specific connection states of the AC power system 9 and the power stabilization system 1.
- a solar cell module 50 is shown as an example of a distributed power source using natural energy, and the solar cell module 50 is connected to an AC power system 9 via a power converter 51 and a (for power) transformer 52. It is linked to.
- a diesel generator group 70 including a plurality of small-capacity diesel generators is shown as an example of another generator of the power plant 7, and the diesel generator group 70 is connected to the AC power system 9 via a transformer 72. It is linked to.
- the customer load 8 is connected to the AC power system 9 via the transformer 82.
- a storage battery is shown as an example of the power storage device 20, and the storage battery 20 is linked to the AC power system 9 through a power converter 21 and a transformer 22.
- voltage / current data or power flow data of each node and operation information of the diesel generator group 70 are input to the control device 10 as an example of system information.
- 3 includes a frequency detection unit 111, a frequency fluctuation compensation calculation unit 112, a frequency deviation compensation calculation unit 113, a frequency compensation calculation unit 114, and a power converter control unit 115. Yes.
- the frequency detection unit 111 is connected to the AC power system 9 via the instrument transformer 15. Further, a frequency deviation ⁇ f is output from the frequency detection unit 111. The frequency deviation ⁇ f is input to the frequency fluctuation compensation calculation unit 112 and the frequency deviation compensation calculation unit 113. Further, the frequency fluctuation compensation calculation unit 112 outputs a frequency fluctuation compensation amount Wf1. On the other hand, the frequency deviation compensation calculation unit 113 outputs a frequency deviation compensation amount Wf2.
- the frequency compensation calculation unit 114 receives the frequency variation compensation amount Wf1 and the frequency deviation compensation amount Wf2.
- the frequency compensation amount Wf is input from the frequency compensation calculation unit 114 to the power converter control unit 115. And from the power converter control part 115, the control signal Cf of the power converter 21 is output.
- FIG. 4A shows the configuration of the frequency fluctuation compensation calculation unit 112, the frequency deviation compensation calculation unit 113, and the frequency compensation calculation unit 114 in the present embodiment.
- the frequency deviation compensation calculation unit 113 includes a dead zone control unit 1131 and a proportional gain 1132. Further, the frequency compensation calculation unit 114 is configured as an addition unit.
- the frequency deviation ⁇ f is input to the high-pass filter 1121 of the frequency fluctuation compensation calculation unit 112.
- the output value of the high pass filter 1121 is input to the proportional gain 1122.
- the value of the proportional gain 1122 is set to Kff.
- the output value of the proportional gain 1122 is input to the phase compensation unit 1123.
- the phase compensation unit 1123 outputs a frequency fluctuation compensation amount Wf1.
- the frequency deviation ⁇ f is input to the dead zone control unit 1131 of the frequency deviation compensation calculation unit 113.
- the output value of the dead zone control unit 1131 is input to the proportional gain 1132.
- the value of the proportional gain 1132 is set to Kdf. Then, a frequency deviation compensation amount Wf2 is output from the proportional gain 1132.
- the frequency compensation calculation unit (adding unit) 114 receives the frequency fluctuation compensation amount Wf1 and the frequency deviation compensation amount Wf2. The frequency compensation calculation unit 114 outputs the frequency compensation amount Wf.
- the frequency detector 111 detects the system frequency of the AC power system 9 as a frequency measurement value f1 based on the voltage waveform of the AC power system 9 obtained by the instrument transformer 15. Then, the frequency detector 111 outputs a frequency deviation ⁇ f between the frequency measurement value f1 and the reference frequency f0. Note that the frequency detection unit 111 may output the frequency measurement value f1 as it is.
- the frequency fluctuation compensation calculation unit 112 uses the high-pass filter 1121 to extract a fluctuation component of the system frequency from the frequency deviation ⁇ f (or the frequency measurement value f1). Then, the extracted fluctuation component is multiplied by a proportional gain Kff (first proportional gain), and phase compensation (phase lead compensation or phase lag compensation) is performed by the phase compensation unit 1123 to obtain an electric energy for compensating the fluctuation component. A corresponding frequency fluctuation compensation amount Wf1 is obtained.
- the transfer function of the high-pass filter 1121 is H1 and the transfer function of the phase compensation unit 1123 is H2
- the frequency fluctuation compensation amount Wf1 is [Equation 4] It is expressed.
- s is a Laplace transformer
- Fd (s) is a Laplace transform of the frequency deviation ⁇ f.
- T f1 , T f2 and T f3 are time constants.
- the frequency deviation compensation calculation unit 113 causes the dead band control unit 1131 to extract a deviation amount in which the system frequency has deviated from the set dead band from the frequency deviation ⁇ f (or the frequency measurement value f1). For example, if the dead band is set to ⁇ 0.15 Hz when the reference frequency f0 of the system frequency is 60 Hz, the deviation amount from which the frequency deviation ⁇ f deviates from ⁇ 0.15 Hz (or the frequency measurement value f1 is 60 Hz ⁇ 0.15 Hz). The deviation amount deviating) is extracted. Then, the extracted deviation amount is multiplied by a proportional gain Kdf to obtain a frequency deviation compensation amount Wf2 corresponding to the power amount for compensating the deviation amount.
- the frequency compensation calculation unit (addition unit) 114 adds the frequency variation compensation amount Wf1 and the frequency deviation compensation amount Wf2 to obtain the frequency compensation amount Wf.
- the power converter control part 115 outputs the control signal Cf according to the frequency compensation amount Wf, and controls the power conversion operation
- FIG. 5 shows a configuration of a conventional compensation calculation unit that does not perform dead band control by the frequency deviation compensation calculation unit 113 of the present embodiment.
- the compensation calculation unit 132 shown in FIG. 5 includes a high-pass filter 1021, a proportional gain 1022, and a phase compensation unit 1023, and performs only the variation compensation control similar to the frequency variation compensation calculation unit 112 of the present embodiment.
- the output value of the phase compensation unit 1023 is output as it is as the frequency compensation amount Wf.
- FIG. 6 shows an example of frequency fluctuations in the power system due to fluctuations in the output of photovoltaic power generation.
- the generator capacity in this example, the generator capacity of the diesel generator group 70
- the output power waveform and power system frequency waveform of the solar cell module 50 when the solar cell module 50 causes 5% output fluctuation are shown.
- the governor-free control of the diesel generator group 70 cannot sufficiently adjust the frequency, and the system frequency of the AC power system 9 greatly deviates from the target range set to 60 Hz ⁇ 0.2 Hz. Yes.
- the power converter 21 is controlled in accordance with the output value (frequency compensation amount Wf) of the compensation calculation unit 132 shown in FIG. 5, for example, as shown in FIG. Absorption / emission) is performed, and the frequency variation can be kept within the target range.
- the frequency fluctuation is targeted with the same control constant as in FIG. It cannot fit within the range.
- the fluctuation compensation control by the frequency fluctuation compensation calculation unit 112 and the dead zone control by the frequency deviation compensation calculation unit 113 are used in parallel.
- the power converter 21 is controlled according to the frequency compensation amount Wf obtained by adding the frequency variation compensation amount Wf1 and the frequency deviation compensation amount Wf2.
- the configuration of the control device according to the second embodiment will be described with reference to FIGS. 13 and 4B.
- the power line is indicated by a solid line
- the signal line is indicated by a broken line.
- the 13 includes a power flow detection unit 121, a power flow fluctuation compensation calculation unit 122, a power flow deviation compensation calculation unit 123, a power flow compensation calculation unit 124, and a power converter control unit 125. It consists of
- System information of the AC power system 9 is input to the power flow detection unit 121.
- the power flow detection unit 121 outputs a power flow deviation ⁇ p.
- the power flow deviation ⁇ p is input to the power flow fluctuation compensation calculation unit 122 and the power flow deviation compensation calculation unit 123.
- the power flow fluctuation compensation calculation unit 122 outputs a power flow fluctuation compensation amount Wp1.
- the power flow deviation compensation calculation unit 123 outputs a power flow deviation compensation amount Wp2.
- the power flow compensation calculation unit 124 receives a power flow fluctuation compensation amount Wp1 and a power flow deviation compensation amount Wp2.
- the power flow compensation amount Wp is input from the power flow compensation calculation unit 124 to the power converter control unit 125. And from the power converter control part 125, the control signal Cp of the power converter 21 is output.
- FIG. 4B shows the configuration of the power flow fluctuation compensation calculation unit 122, the power flow deviation compensation calculation unit 123, and the power flow compensation calculation unit 124 in the present embodiment.
- the power flow fluctuation compensation calculation unit 122 illustrated in FIG. 4B includes a high-pass filter 1221, a proportional gain 1222, and a phase compensation unit 1223, similarly to the frequency fluctuation compensation calculation unit 112 of the first embodiment. It is configured.
- the power flow deviation compensation calculation unit 123 includes a dead band control unit 1231 and a proportional gain 1232 as in the frequency deviation compensation calculation unit 113 of the first embodiment.
- the power flow compensation calculation unit 124 is configured as an addition unit, similar to the frequency compensation calculation unit 114 of the first embodiment.
- the power flow deviation ⁇ p is input to the high-pass filter 1221 of the power flow fluctuation compensation calculation unit 122.
- the output value of the high pass filter 1221 is input to the proportional gain 1222. Further, the output value of the proportional gain 1222 is input to the phase compensation unit 1223.
- the phase compensation unit 1223 outputs a power flow fluctuation compensation amount Wp1.
- the power flow deviation ⁇ p is input to the dead zone control unit 1231 of the power flow deviation compensation calculation unit 123.
- the output value of the dead zone controller 1231 is input to the proportional gain 1232.
- the power gain deviation compensation amount Wp2 is output from the proportional gain 1232.
- a power flow fluctuation compensation amount Wp1 and a power flow deviation compensation amount Wp2 are input to the power flow compensation calculation unit (adder) 124.
- a power flow compensation amount Wp is output from the power flow compensation calculation unit 124.
- the power flow detection unit 121 detects the power flow of the AC power system 9 as the power flow measurement value PL1 based on the input system information. For example, voltage / current data of each node is input as system information, and a voltage value, a phase angle, active power, reactive power, and the like are obtained from these data. Further, the power flow data of each node may be directly input to the power flow detection unit 121. Then, the power flow detection unit 121 outputs a power flow deviation ⁇ p between the power flow measurement value PL1 and the power flow target value PL0. The power flow detector 121 may output the power flow measurement value PL1 as it is.
- the power flow fluctuation compensation calculation unit 122 uses the high-pass filter 1221 to extract a power flow fluctuation component from the power flow deviation ⁇ p (or the power flow measurement value PL1). Then, the extracted fluctuation component is multiplied by a proportional gain Kfp (second proportional gain), phase compensation is performed by the phase compensation unit 1223, and an electric power flow fluctuation compensation amount Wp1 corresponding to the electric energy for compensating the fluctuation component is obtained. Ask.
- This power flow fluctuation compensation amount Wp1 is similar to the above equation (4). [Equation 5] It is expressed.
- Pd (s) is Laplace transform of the power flow deviation ⁇ p.
- T p1 , T p2 and T p3 are time constants.
- the power flow deviation compensation calculating unit 123 causes the dead band control unit 1231 to extract a deviation amount from which the power flow has deviated from the set dead band from the power flow deviation ⁇ p (or the measured power flow value PL1). Then, the extracted deviation amount is multiplied by a proportional gain Kdp to obtain a power flow deviation compensation amount Wp2 corresponding to the electric energy for compensating the deviation amount.
- the power flow compensation calculation unit (adding unit) 124 adds the power flow fluctuation compensation amount Wp1 and the power flow deviation compensation amount Wp2 to obtain the power flow compensation amount Wp.
- the power converter control part 125 outputs the control signal Cp according to the power flow compensation amount Wp, and controls the power conversion operation
- fluctuation compensation control by the power flow fluctuation compensation calculation unit 112 and dead zone control by the power flow deviation compensation calculation unit 113 are used in parallel. Then, the power converter 21 is controlled according to the power flow compensation amount Wp obtained by adding the power flow fluctuation compensation amount Wp1 and the power flow deviation compensation amount Wp2. As a result, fluctuations in the power flow can be suppressed without undercompensation or overcompensation, and as a result, fluctuations in the system frequency can be suppressed.
- the control device 10c shown in FIG. 14 has both a configuration for obtaining the frequency compensation amount Wf in the first embodiment and a configuration for obtaining the power flow compensation amount Wp in the second embodiment. That is, the control device 10c includes a frequency detection unit 111, a frequency variation compensation calculation unit 112, a frequency deviation compensation calculation unit 113, a frequency compensation calculation unit 114, a power flow detection unit 121, a power flow variation compensation calculation unit 122, and a power flow deviation compensation. A calculation unit 123 and a power flow compensation calculation unit 124 are included. Control device 10c further includes a command value generation unit 134 and a power converter control unit 135.
- the command value generation unit 134 obtains the control command value W0 based on the frequency compensation amount Wf and the power flow compensation amount Wp. And the power converter control part 135 outputs the control signal C0 according to the control command value W0, and controls the power conversion operation
- FIG. 1 The command value generation unit 134 obtains the control command value W0 based on the frequency compensation amount Wf and the power flow compensation amount Wp. And the power converter control part 135 outputs the control signal C0 according to the control command value W0, and controls the power conversion operation
- the control device 10c of this embodiment controls the power converter 21 according to both the frequency compensation amount Wf of the first embodiment and the power flow compensation amount Wp of the second embodiment. Thereby, the fluctuation
- the command value generation unit 134 can select and output either the frequency compensation amount Wf or the power flow compensation amount Wp as the control command value W0.
- the command value generation unit 134 may calculate the control command value W0 by performing operations such as addition, subtraction, multiplication, and division on the frequency compensation amount Wf and the power flow compensation amount Wp.
- the average value of the frequency compensation amount Wf and the power flow compensation amount Wp can be calculated as the control command value W0.
- the control command value W0 may be calculated by taking a weighted average of the frequency compensation amount Wf and the power flow compensation amount Wp.
- FIG. 15A shows only the configuration for obtaining the frequency compensation amount Wf from the frequency deviation ⁇ f, and this configuration can be applied to the control device of the first or third embodiment.
- FIG. 15B shows only the configuration for obtaining the power flow compensation amount Wp from the power flow deviation ⁇ p, and this configuration can be applied to the control device of the second or third embodiment.
- the control device of the present embodiment is different from the configuration of the first or third embodiment shown in FIG. 4 (a) in the deviation number counting unit 1141 and the proportional gain setting unit 1143. Is further included. Further, as shown in FIG. 15 (b), a deviation count counting unit 1241 and a proportional gain setting unit 1243 are further included in the configuration of the second or third embodiment shown in FIG. 4 (b). ing.
- the dead zone controller 1131 outputs a departure flag FL when the system frequency deviates from the dead zone. Further, the departure number counting unit 1141 counts the number of departures as the first departure number CN according to the departure flag FL. Then, the first proportional gain setting unit 1143 sets the first proportional gain Kff according to the first deviation count CN in a predetermined period. For example, as shown in FIG. 16, the proportional gain setting unit 1143 sets the proportional gain Kff with reference to a setting table in which the counted number of deviations CN is associated with the set proportional gain Kff.
- the dead zone controller 1231 outputs a departure flag FL when the power flow deviates from the dead zone. Further, the departure count unit 1241 counts the number of departures as the second departure number CN according to the departure flag FL. Then, the second proportional gain setting unit 1243 sets the second proportional gain Kfp according to the second deviation number CN in a predetermined period. For example, similarly to the first proportional gain Kff, the proportional gain setting unit 1243 sets the proportional gain Kfp with reference to a setting table in which the counted number of deviations CN and the set proportional gain Kfp are associated with each other.
- the proportional gain Kff or Kfp of the fluctuation compensation control is set according to the number of deviations CN that deviates from the dead zone.
- the compensation amount of the fluctuation compensation control can be adjusted by changing the proportional gain Kff or Kfp, for example, in a time zone or a day of the week that frequently deviates from the dead zone.
- FIG. 17A shows only a configuration for obtaining the frequency compensation amount Wf from the frequency deviation ⁇ f, and this configuration is applicable to the control device of the first or third embodiment.
- FIG. 17B shows only a configuration for obtaining the power flow compensation amount Wp from the power flow deviation ⁇ p, and this configuration can be applied to the control device of the second or third embodiment.
- the control device of this embodiment is different from the configuration of the first or third embodiment shown in FIG. 4A in the deviation time measuring unit 1142 and the proportional gain setting unit 1144. Is further included. Further, as shown in FIG. 17 (b), a deviation time measuring unit 1242 and a proportional gain setting unit 1244 are further included in the configuration of the second or third embodiment shown in FIG. 4 (b). ing.
- the dead zone controller 1131 outputs a departure flag FL when the system frequency deviates from the dead zone.
- the departure time measuring unit 1142 measures the departure time as the first departure time T according to the departure flag FL.
- the third proportional gain setting unit 1144 sets the first proportional gain Kff according to the first deviation time T in the predetermined period. For example, as shown in FIG. 18, the proportional gain setting unit 1144 sets the proportional gain Kff with reference to a setting table in which the measured departure time T is associated with the set proportional gain Kff.
- the dead zone controller 1231 outputs a departure flag FL when the power flow deviates from the dead zone.
- the departure time measuring unit 1242 measures the departure time as the second departure time T according to the departure flag FL.
- the fourth proportional gain setting unit 1244 sets the second proportional gain Kfp according to the second deviation time T in the predetermined period. For example, similarly to the first proportional gain Kff, the proportional gain setting unit 1244 sets the proportional gain Kfp with reference to a setting table in which the measured deviation time T and the set proportional gain Kfp are associated with each other.
- the proportional gain Kff or Kfp of the fluctuation compensation control is set according to the departure time T that deviates from the dead zone.
- the proportional gain Kff or Kfp is changed to adjust the compensation amount of the fluctuation compensation control, for example, in a time zone or a day of the week that frequently deviates from the dead zone. it can.
- FIG. 19A shows only the configuration for obtaining the frequency compensation amount Wf from the frequency deviation ⁇ f, and this configuration can be applied to the control device of the first or third embodiment.
- FIG. 19B shows only the configuration for obtaining the power flow compensation amount Wp from the power flow deviation ⁇ p, and this configuration can be applied to the control device of the second or third embodiment.
- the control device of the present embodiment is configured to further include a state monitoring unit 101 with respect to the configuration of the first or third embodiment shown in FIG. Yes.
- System information of the AC power system 9 is input to the state monitoring unit 101.
- the state monitoring unit 101 outputs setting change command values for changing the control constants to the high-pass filter 1121, the proportional gains 1122 and 1132, the phase compensation unit 1123, and the dead zone control unit 1131.
- the state monitoring unit 101 is further included in the configuration of the second or third embodiment shown in FIG. 4B.
- System information of the AC power system 9 is input to the state monitoring unit 101.
- the state monitoring unit 101 outputs setting change command values for changing the control constants to the high-pass filter 1221, the proportional gains 1222 and 1232, the phase compensation unit 1223, and the dead zone control unit 1231.
- FIG. 20 shows a configuration of the state monitoring unit 101 in the present embodiment.
- the state monitoring unit 101 shown in FIG. 20 includes a system frequency characteristic estimation unit 1011 and a control constant selection table 1012.
- the system frequency characteristic estimation unit 1011 acquires, for example, the frequency measurement value f1, the output value of the diesel generator group 70, the number of operating units, and the like as the system information, and the system frequency characteristic constant of the AC power system 9 from the acquired system information. K is estimated. Then, with reference to the control constant selection table 1012 in which the estimated system frequency characteristic constant K is associated with the control constant of each part to be set, the setting change command value for the control constant of each part is output.
- the control constants of the fluctuation compensation control and / or the dead zone control are changed according to the system information of the AC power system 9.
- the compensation amount of the fluctuation compensation control and / or the dead zone control can be adjusted according to the frequency characteristic of the AC power system 9 that changes according to the output value of the diesel generator group 70 and the number of operating units.
- system information such as the frequency measurement value f 1, the output value of the diesel generator group 70, and the number of operating units is directly associated with the control constant of each unit.
- a control constant selection table can also be used.
- the frequency fluctuation compensation amount Wf1 corresponding to the electric energy for compensating the fluctuation component of the system frequency of the AC power system 9 and the set dead band A frequency deviation compensation amount Wf2 corresponding to the power amount for compensating the deviation amount deviated is obtained, and between the AC power system 9 and the power storage device 20 by the power converter 21 according to the frequency compensation amount Wf obtained by adding these.
- system frequency fluctuations can be suppressed without undercompensation or overcompensation.
- frequency fluctuations can be reliably kept within the target range, and power loss due to charge / discharge and power conversion can be suppressed.
- the power flow fluctuation compensation amount Wp1 corresponding to the power quantity for compensating the fluctuation component of the power flow of the AC power system 9 and the set dead band are obtained.
- a power flow deviation compensation amount Wp2 corresponding to the power amount that compensates the deviation amount from which the power flow has deviated is obtained, and the power conversion operation of the power converter 21 is controlled according to the power flow compensation amount Wp obtained by adding these.
- the power stabilization system including the control device 10c includes both a configuration for obtaining the frequency compensation amount Wf and a configuration for obtaining the power flow compensation amount Wp, so that one of these is selected as a control command value W0. It is possible to control the power converter 21 according to the above, or to control the power converter 21 according to the control command value W0 calculated by performing operations on these.
- the dead band is frequently deviated. It is possible to adjust the compensation amount of the fluctuation compensation control by changing the proportional gain Kff or Kfp in a special time zone.
- the compensation amount of the fluctuation compensation control and / or the dead zone control can be adjusted according to the frequency characteristics.
Abstract
Description
[数1]
また、需要家負荷の変動分をΔPLとすると、負荷の周波数特性定数KLは、以下の式(2)のように表される。
[数2]
したがって、電力系統における電力の変動分をΔPとすると、電力系統の系統周波数特性定数Kは、
[数3]
となり、発電機の台数が変化することにより、発電機群全体の周波数特性が変化し、電力系統の周波数特性も変化する。
以下、図1および図2を参照して、後述する第1ないし第3実施形態における制御装置を備えた電力安定化システムの構成について説明する。なお、図1および図2においては、電力線を実線で示し、信号線を破線で示している。
===制御装置の構成===
以下、図3および図4(a)を参照して、第1の実施形態における制御装置の構成について説明する。なお、図3においては、電力線を実線で示し、信号線を破線で示している。
次に、本実施形態における制御装置の動作について説明する。
[数4]
と表される。ここで、sはラプラス変換子であり、Fd(s)は周波数偏差Δfのラプラス変換である。また、Tf1,Tf2,Tf3は時定数である。
以下、図5ないし図12を適宜参照して、本実施形態における制御装置による周波数変動の抑制動作の具体例について説明する。
===制御装置の構成===
以下、図13および図4(b)を参照して、第2の実施形態における制御装置の構成について説明する。なお、図13においては、電力線を実線で示し、信号線を破線で示している。
次に、本実施形態における制御装置の動作について説明する。
[数5]
と表される。ここで、Pd(s)は電力潮流偏差Δpのラプラス変換である。また、Tp1,Tp2,Tp3は時定数である。
===制御装置の構成および動作===
以下、図14を参照して、第3の実施形態における制御装置の構成および動作について説明する。なお、図14においては、電力線を実線で示し、信号線を破線で示している。
===制御装置の構成および動作===
以下、図15および図16を参照して、第4の実施形態における制御装置の構成および動作について説明する。なお、図15(a)は、周波数偏差Δfから周波数補償量Wfを求める構成のみを示しており、当該構成は、第1または第3実施形態の制御装置に対して適用可能である。また、図15(b)は、電力潮流偏差Δpから電力潮流補償量Wpを求める構成のみを示しており、当該構成は、第2または第3実施形態の制御装置に対して適用可能である。
===制御装置の構成および動作===
以下、図17および図18を参照して、第5の実施形態における制御装置の構成および動作について説明する。なお、図17(a)は、周波数偏差Δfから周波数補償量Wfを求める構成のみを示しており、当該構成は、第1または第3実施形態の制御装置に対して適用可能である。また、図17(b)は、電力潮流偏差Δpから電力潮流補償量Wpを求める構成のみを示しており、当該構成は、第2または第3実施形態の制御装置に対して適用可能である。
===制御装置の構成および動作===
以下、図19および図20を参照して、第6の実施形態における制御装置の構成および動作について説明する。なお、図19(a)は、周波数偏差Δfから周波数補償量Wfを求める構成のみを示しており、当該構成は、第1または第3実施形態の制御装置に対して適用可能である。また、図19(b)は、電力潮流偏差Δpから電力潮流補償量Wpを求める構成のみを示しており、当該構成は、第2または第3実施形態の制御装置に対して適用可能である。
5 太陽光発電所
6 風力発電所
7 発電所
8 需要家負荷
9 交流電力系統
10(10a~10c) 制御装置
15 計器用変圧器
20 電力貯蔵装置(蓄電池)
50 太陽電池モジュール
60 風力発電機
70 ディーゼル発電機群
21、51、61 電力変換器
22、52、72、82 (電力用)変圧器
101 状態監視部
111 周波数検出部
112 周波数変動補償演算部
113 周波数逸脱補償演算部
114 周波数補償演算部(加算部)
121 電力潮流検出部
122 電力潮流変動補償演算部
123 電力潮流逸脱補償演算部
124 電力潮流補償演算部
134 指令値生成部
115、125、135 電力変換器制御部
1011 系統周波数特性推定部
1012 制御定数選択テーブル
1121、1221 ハイパスフィルタ
1123、1223 位相補償部
1131、1231 不感帯制御部
1122、1132、1222、1232 比例ゲイン
1141、1241 逸脱回数カウント部
1142、1242 逸脱時間計測部
1143、1144、1243、1244 比例ゲイン設定部
Claims (13)
- 交流電力系統の有効電力変動を抑制する電力安定化システムであって、
電力を貯蔵し、前記交流電力系統との間で電力の吸収または放出を行う電力貯蔵装置と、
前記交流電力系統と前記電力貯蔵装置との間で吸収または放出される電力を相互に変換する電力変換器と、
前記交流電力系統の有効電力変動に応じて前記電力変換器を制御する制御装置と、
を備え、
前記制御装置は、
前記交流電力系統の系統周波数を周波数計測値として検出する周波数検出部と、
前記周波数計測値に基づいて、前記系統周波数の変動成分を抽出し、当該抽出した変動成分を補償する電力量を周波数変動補償量として求める周波数変動補償演算部と、
前記周波数計測値に基づいて、前記系統周波数に設定された不感帯を前記系統周波数が逸脱した逸脱量を抽出し、当該抽出した逸脱量を補償する電力量を周波数逸脱補償量として求める周波数逸脱補償演算部と、
前記周波数変動補償量と前記周波数逸脱補償量とを加算して周波数補償量を求める周波数補償演算部と、
前記周波数補償量に応じて前記電力変換器を制御する電力変換器制御部と、
を有することを特徴とする電力安定化システム。 - 交流電力系統の有効電力変動を抑制する電力安定化システムであって、
電力を貯蔵し、前記交流電力系統との間で電力の吸収または放出を行う電力貯蔵装置と、
前記交流電力系統と前記電力貯蔵装置との間で吸収または放出される電力を相互に変換する電力変換器と、
前記交流電力系統の有効電力変動に応じて前記電力変換器を制御する制御装置と、
を備え、
前記制御装置は、
前記交流電力系統の電力潮流を電力潮流計測値として検出する電力潮流検出部と、
前記電力潮流計測値に基づいて、前記電力潮流の変動成分を抽出し、当該抽出した変動成分を補償する電力量を電力潮流変動補償量として求める電力潮流変動補償演算部と、
前記電力潮流計測値に基づいて、前記電力潮流に設定された不感帯を前記電力潮流が逸脱した逸脱量を抽出し、当該抽出した逸脱量を補償する電力量を電力潮流逸脱補償量として求める電力潮流逸脱補償演算部と、
前記電力潮流変動補償量と前記電力潮流逸脱補償量とを加算して電力潮流補償量を求める電力潮流補償演算部と、
前記電力潮流補償量に応じて前記電力変換器を制御する電力変換器制御部と、
を有することを特徴とする電力安定化システム。 - 請求項1に記載の電力安定化システムであって、
前記制御装置は、
前記交流電力系統の電力潮流を電力潮流計測値として検出する電力潮流検出部と、
前記電力潮流計測値に基づいて、前記電力潮流の変動成分を抽出し、当該抽出した変動成分を補償する電力量を電力潮流変動補償量として求める電力潮流変動補償演算部と、
前記電力潮流計測値に基づいて、前記電力潮流に設定された不感帯を前記電力潮流が逸脱した逸脱量を抽出し、当該抽出した逸脱量を補償する電力量を電力潮流逸脱補償量として求める電力潮流逸脱補償演算部と、
前記電力潮流変動補償量と前記電力潮流逸脱補償量とを加算して電力潮流補償量を求める電力潮流補償演算部と、
をさらに有し、
前記電力変換器制御部は、前記周波数補償量および前記電力潮流補償量に応じて前記電力変換器を制御することを特徴とする電力安定化システム。 - 請求項1または請求項3に記載の電力安定化システムであって、
前記周波数変動補償演算部は、前記系統周波数の変動成分に第1の比例ゲインを乗算し、位相補償を行って前記周波数変動補償量を求め、
前記制御装置は、
前記系統周波数に設定された不感帯を前記系統周波数が逸脱した回数を第1の逸脱回数としてカウントする第1の逸脱回数カウント部と、
前記第1の逸脱回数に応じて前記第1の比例ゲインを設定する第1の比例ゲイン設定部と、
をさらに有することを特徴とする電力安定化システム。 - 請求項2または請求項3に記載の電力安定化システムであって、
前記電力潮流変動補償演算部は、前記電力潮流の変動成分に第2の比例ゲインを乗算し、位相補償を行って前記電力潮流変動補償量を求め、
前記制御装置は、
前記電力潮流に設定された不感帯を前記電力潮流が逸脱した回数を第2の逸脱回数としてカウントする第2の逸脱回数カウント部と、
前記第2の逸脱回数に応じて前記第2の比例ゲインを設定する第2の比例ゲイン設定部と、
をさらに有することを特徴とする電力安定化システム。 - 請求項1または請求項3に記載の電力安定化システムであって、
前記周波数変動補償演算部は、前記系統周波数の変動成分に第1の比例ゲインを乗算し、位相補償を行って前記周波数変動補償量を求め、
前記制御装置は、
前記系統周波数に設定された不感帯を前記系統周波数が逸脱した時間を第1の逸脱時間として計測する第1の逸脱時間計測部と、
前記第1の逸脱時間に応じて前記第1の比例ゲインを設定する第3の比例ゲイン設定部と、
をさらに有することを特徴とする電力安定化システム。 - 請求項2または請求項3に記載の電力安定化システムであって、
前記電力潮流変動補償演算部は、前記電力潮流の変動成分に第2の比例ゲインを乗算し、位相補償を行って前記電力潮流変動補償量を求め、
前記制御装置は、
前記電力潮流に設定された不感帯を前記電力潮流が逸脱した時間を第2の逸脱時間として計測する第2の逸脱時間計測部と、
前記第2の逸脱時間に応じて前記第2の比例ゲインを設定する第4の比例ゲイン設定部と、
をさらに有することを特徴とする電力安定化システム。 - 請求項1または請求項3に記載の電力安定化システムであって、
前記制御装置は、前記交流電力系統の状態を示す系統情報を取得し、当該取得した系統情報に基づいて、前記周波数変動補償演算部の制御定数を変更する状態監視部をさらに有することを特徴とする電力安定化システム。 - 請求項2または請求項3に記載の電力安定化システムであって、
前記制御装置は、前記交流電力系統の状態を示す系統情報を取得し、当該取得した系統情報に基づいて、前記電力潮流変動補償演算部の制御定数を変更する状態監視部をさらに有することを特徴とする電力安定化システム。 - 請求項1または請求項3に記載の電力安定化システムであって、
前記制御装置は、前記交流電力系統の状態を示す系統情報を取得し、当該取得した系統情報に基づいて、前記周波数逸脱補償演算部の制御定数を変更する状態監視部をさらに有することを特徴とする電力安定化システム。 - 請求項2または請求項3に記載の電力安定化システムであって、
前記制御装置は、前記交流電力系統の状態を示す系統情報を取得し、当該取得した系統情報に基づいて、前記電力潮流逸脱補償演算部の制御定数を変更する状態監視部をさらに有することを特徴とする電力安定化システム。 - 電力を貯蔵し、交流電力系統との間で電力の吸収または放出を行う電力貯蔵装置と、
前記交流電力系統と前記電力貯蔵装置との間で吸収または放出される電力を相互に変換する電力変換器と、
ともに用いられ、前記交流電力系統の有効電力変動を抑制すべく前記電力変換器を制御する制御装置であって、
前記交流電力系統の系統周波数を周波数計測値として検出する周波数検出部と、
前記周波数計測値に基づいて、前記系統周波数の変動成分を抽出し、当該抽出した変動成分を補償する電力量を周波数変動補償量として求める周波数変動補償演算部と、
前記周波数計測値に基づいて、前記系統周波数に設定された不感帯を前記系統周波数が逸脱した逸脱量を抽出し、当該抽出した逸脱量を補償する電力量を周波数逸脱補償量として求める周波数逸脱補償演算部と、
前記周波数変動補償量と前記周波数逸脱補償量とを加算して周波数補償量を求める周波数補償演算部と、
前記周波数補償量に応じて前記電力変換器を制御する電力変換器制御部と、
を有することを特徴とする制御装置。 - 電力を貯蔵し、交流電力系統との間で電力の吸収または放出を行う電力貯蔵装置と、
前記交流電力系統と前記電力貯蔵装置との間で吸収または放出される電力を相互に変換する電力変換器と、
ともに用いられ、前記交流電力系統の有効電力変動を抑制すべく前記電力変換器を制御する制御装置であって、
前記交流電力系統の電力潮流を電力潮流計測値として検出する電力潮流検出部と、
前記電力潮流計測値に基づいて、前記電力潮流の変動成分を抽出し、当該抽出した変動成分を補償する電力量を電力潮流変動補償量として求める電力潮流変動補償演算部と、
前記電力潮流計測値に基づいて、前記電力潮流に設定された不感帯を前記電力潮流が逸脱した逸脱量を抽出し、当該抽出した逸脱量を補償する電力量を電力潮流逸脱補償量として求める電力潮流逸脱補償演算部と、
前記電力潮流変動補償量と前記電力潮流逸脱補償量とを加算して電力潮流補償量を求める電力潮流補償演算部と、
前記電力潮流補償量に応じて前記電力変換器を制御する電力変換器制御部と、
を有することを特徴とする制御装置。
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JP2019003454A (ja) * | 2017-06-16 | 2019-01-10 | 東京電力ホールディングス株式会社 | 交直変換器制御装置 |
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EP3425760A4 (en) * | 2016-03-04 | 2019-11-20 | Kabushiki Kaisha Toshiba | VOLTAGE BLIND POWER CONTROL DEVICE AND VOLTAGE BLIND POWER CONTROL PROGRAM |
JP2021035108A (ja) * | 2019-08-21 | 2021-03-01 | 東京電力ホールディングス株式会社 | 慣性推定装置、慣性推定プログラム及び慣性推定方法 |
JP2021052546A (ja) * | 2019-09-26 | 2021-04-01 | 東京電力ホールディングス株式会社 | ネガワット取引支援装置、ネガワット取引システムおよびネガワット取引方法 |
JP2021052545A (ja) * | 2019-09-26 | 2021-04-01 | 東京電力ホールディングス株式会社 | ネガワット取引支援装置、ネガワット取引システムおよびネガワット取引方法 |
WO2022264303A1 (ja) * | 2021-06-16 | 2022-12-22 | 東芝三菱電機産業システム株式会社 | 無停電電源装置 |
JP7411226B2 (ja) | 2020-07-29 | 2024-01-11 | ネクストエナジー・アンド・リソース株式会社 | 出力制御装置 |
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EP3425760A4 (en) * | 2016-03-04 | 2019-11-20 | Kabushiki Kaisha Toshiba | VOLTAGE BLIND POWER CONTROL DEVICE AND VOLTAGE BLIND POWER CONTROL PROGRAM |
JP7304010B2 (ja) | 2017-01-24 | 2023-07-06 | 住友電気工業株式会社 | エネルギー貯蔵システムおよび変動電力安定利用システム |
JPWO2018139004A1 (ja) * | 2017-01-24 | 2019-11-14 | 住友電気工業株式会社 | エネルギー貯蔵システムおよび変動電力安定利用システム |
JP7228126B2 (ja) | 2017-01-24 | 2023-02-24 | 住友電気工業株式会社 | エネルギー貯蔵システムおよび変動電力安定利用システム |
JP2022097523A (ja) * | 2017-01-24 | 2022-06-30 | 住友電気工業株式会社 | エネルギー貯蔵システムおよび変動電力安定利用システム |
JP2019003454A (ja) * | 2017-06-16 | 2019-01-10 | 東京電力ホールディングス株式会社 | 交直変換器制御装置 |
CN108964025B (zh) * | 2018-06-29 | 2021-07-02 | 国电南瑞科技股份有限公司 | 一种含多条直流线路的异步电网agc控制方法 |
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JP7358836B2 (ja) | 2019-08-21 | 2023-10-11 | 東京電力ホールディングス株式会社 | 慣性推定装置、慣性推定プログラム及び慣性推定方法 |
JP2021052545A (ja) * | 2019-09-26 | 2021-04-01 | 東京電力ホールディングス株式会社 | ネガワット取引支援装置、ネガワット取引システムおよびネガワット取引方法 |
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JP7331587B2 (ja) | 2019-09-26 | 2023-08-23 | 東京電力ホールディングス株式会社 | ネガワット取引支援装置、ネガワット取引システムおよびネガワット取引方法 |
JP7412674B2 (ja) | 2019-09-26 | 2024-01-15 | 東京電力ホールディングス株式会社 | ネガワット取引支援装置、ネガワット取引システムおよびネガワット取引方法 |
JP7411226B2 (ja) | 2020-07-29 | 2024-01-11 | ネクストエナジー・アンド・リソース株式会社 | 出力制御装置 |
WO2022264303A1 (ja) * | 2021-06-16 | 2022-12-22 | 東芝三菱電機産業システム株式会社 | 無停電電源装置 |
JP7218453B1 (ja) * | 2021-06-16 | 2023-02-06 | 東芝三菱電機産業システム株式会社 | 無停電電源装置 |
Also Published As
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JPWO2014196364A1 (ja) | 2017-02-23 |
JP6020721B2 (ja) | 2016-11-02 |
PH12015501299A1 (en) | 2015-08-24 |
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