WO2020152808A1 - 電力供給システム、及び電力供給システムの制御方法 - Google Patents
電力供給システム、及び電力供給システムの制御方法 Download PDFInfo
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- WO2020152808A1 WO2020152808A1 PCT/JP2019/002108 JP2019002108W WO2020152808A1 WO 2020152808 A1 WO2020152808 A1 WO 2020152808A1 JP 2019002108 W JP2019002108 W JP 2019002108W WO 2020152808 A1 WO2020152808 A1 WO 2020152808A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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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
-
- 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
-
- 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
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/23—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only arranged for operation in parallel
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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
- 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
-
- 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
-
- 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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/10—The network having a local or delimited stationary reach
Definitions
- the embodiment of the present invention relates to a power supply system and a control method for the power supply system.
- renewable energy power sources such as solar power generation and wind power generation are connected to an AC system by a power converter (inverter) using power electronics technology.
- a power supply is called an inverter power supply.
- the inverter power supply also includes a system such as a storage battery installed to suppress the output fluctuation of the renewable energy.
- control to establish the voltage and frequency of the power system while maintaining the output sharing of multiple inverter power supplies is required.
- control is known in which a droop characteristic is provided between the active power and the voltage frequency of each inverter power supply operated in the voltage source mode. Then, power distribution control is performed based on the droop characteristics of the active power and the voltage frequency in which these droop characteristics are unified.
- the balance of the droop characteristics between the effective power and the voltage frequency which is unified with the power supply amount between the nodes, is lost.
- the problem to be solved by the invention is a power supply system capable of establishing a voltage and a frequency of a system while maintaining output sharing of the inverter power supply when each inverter power supply is connected between nodes having different impedance characteristics. Is to provide.
- the water power supply system includes a plurality of first power conversion units that supply power according to a distribution characteristic of power supplied to a load, and changes in active power with respect to output frequencies of the plurality of first power conversion units. And a plurality of control devices that respectively control the plurality of first power conversion units based on the change rate by making the rate correspond to the distribution characteristic.
- the figure of active power-frequency droop characteristic which shows the relationship between active power and frequency.
- the figure of the reactive power-voltage droop characteristic which shows the relationship between delayed reactive power and voltage.
- FIG. 1 is a diagram showing an overall configuration of a power supply system 1 according to the first embodiment.
- the power supply system 1 is an inverter system that supplies electric power to a load 100, and includes a plurality of distributed power supply groups 10 to 10n and a plurality of transformers 12 to 12n.
- FIG. 1 further shows a load 100, a first bus line L1, a plurality of second bus lines L2 to L2n, a plurality of nodes J1 to J1n, and a plurality of nodes J2 to J2n.
- the plurality of second bus lines L2 to L2n are connected in parallel to the first bus line L1 via the plurality of nodes J1 to J1n.
- the distributed power supply group 10 is a power supply group that can supply power to the load 100 independently of other distributed power supply groups.
- the distributed power supply group 10 includes a first inverter power supply 14 and a plurality of second inverter power supplies 16.
- the first inverter power supply 14 is a power supply that operates as a voltage source.
- the first inverter power supply 14 includes a first power conversion unit 14a, a voltage/current measurement unit 14b, and a control device 14c.
- the first power conversion unit 14a is, for example, an inverter, and converts the power output from the power supply 110 (FIG. 2) into power that can be connected to the power system of the first bus L1 via the second bus L2.
- the first power converter 14a converts DC power output from the power supply 110 (FIG. 2) into AC power.
- the first power converters 14a to 14an are connected to the second buses L2 to L2n via the nodes J2 to J2n.
- the voltage/current measuring unit 14b measures the voltage and current output by the first power conversion unit 14a.
- the voltage/current measuring unit 14b is composed of, for example, an instrument current transformer and an instrument transformer. Further, the voltage/current measuring unit 14b outputs the voltage measurement value and the current measurement value to the control device 14c.
- the control device 14c controls the first power conversion unit 14a based on the measurement value of the voltage/current measurement unit 14b. Details of the control device 14c will be described later.
- the second inverter power supply 16 is a power supply that operates as a current source.
- the second inverter power supply 16 includes a second power conversion unit 16a, a voltage/current measurement unit 16b, and a control device 16c.
- the second power conversion unit 16a is, for example, an inverter, and has the same configuration as the first power conversion unit 14a. That is, the second power converter 16a converts the power output from the power supply 120 (FIG. 5) into power that can be connected to the power system of the first bus L1 via the second bus L2.
- the voltage/current measuring unit 16b has the same configuration as the voltage/current measuring unit 14b. That is, the voltage/current measuring unit 16b outputs the voltage measurement value and the current measurement value to the control device 16c.
- the control device 16c controls the second power conversion unit 16a based on the measurement value of the voltage/current measurement unit 16b. Details of the control device 16c will be described later.
- the distributed power supply groups 10 to 10n have the same configuration as the distributed power supply group 10, but the distribution characteristics of the power supplied to the load 100 are different. That is, the power supplied to the load 100 is distributed according to the impedance until each of the plurality of first power converters 14a to 14an is connected to the first bus. That is, the distribution characteristic of the power supplied to the load 100 is defined by the distribution ratio of the power according to the impedance until it is connected to the first bus. Details of the distribution ratio will be described later.
- the plurality of transformers 12 to 12n convert the voltage of the electric power supplied from the plurality of second buses L2 to L2n into the reference voltage of the first bus L1.
- the impedances of the plurality of transformers 12 to 12n are also included in the impedance until each of the plurality of first power converters 14a to 14an is connected to the first bus.
- a rotating machine type distributed power source may be connected to the first bus bar L1.
- FIG. 2 is a diagram showing a configuration example of the control device 14c when the first inverter power supply 14 operates as a voltage source.
- the control device 14c includes an active/reactive power calculation unit 20, a droop characteristic calculation unit 21, and a gate pulse generation unit 22.
- a power supply 110 is, for example, a renewable energy power supply such as solar power generation or wind power generation.
- the active/reactive power calculation unit 20 calculates the values of active power and reactive power output by the first power conversion unit 14a based on the voltage measurement value and current measurement value output by the voltage/current measurement unit 14b. Then, the active/reactive power calculation unit 20 outputs the values of the active power and the reactive power to the droop characteristic calculation unit 21.
- the droop characteristic calculation unit 21 uses the values of the active power and the reactive power calculated by the active/reactive power calculation unit 20, and based on the active power-frequency droop characteristic and the reactive power-voltage droop characteristic, the first power A command signal indicating the output voltage waveform of the converter 14a is output to the gate pulse generator 22. That is, the droop characteristic calculation unit 21 outputs, as a command signal indicating the output voltage waveform, a signal including information on the phase, frequency, and amplitude of the voltage waveform.
- FIG. 3 is a diagram showing an example of active power-frequency droop characteristics showing the relationship between active power P and frequency f.
- the horizontal axis represents active power P, and the vertical axis represents frequency f.
- the characteristic line fp14 shows the active power-frequency droop characteristic of the first power converter 14a
- the characteristic line fp14n shows the active power-frequency droop characteristic of the first power converter 14an.
- the characteristic lines fp14 to fp14n of the plurality of first power converters 14a to 14an are determined according to the distribution characteristics of the power supplied to the load 100.
- the droop characteristic calculation unit 21 calculates the frequency of the output voltage using the value of active power calculated by the active/reactive power calculation unit 20. That is, the droop characteristic calculator 21 lowers the frequency when increasing the active power of the plurality of first power converters 14a to 14an, and raises the frequency when decreasing the active power.
- the frequency fa is set to the reference frequency of 60 hertz or 50 hertz.
- the active power of the first power conversion unit 14a is active power Pa10
- the active power of the first power conversion unit 14an is active power Pa10n.
- the active power of the first power conversion unit 14a at the frequency fb is the active power Pb10
- the active power of the first power conversion unit 14an is the active power Pb10n.
- the amount of change P1 of the active power in the first power converter 14a is expressed by the equation (1). Further, the amount of change P1n in active power in the first power conversion unit 14an is expressed by the equation (2).
- P1 Pb10-Pa10 (1)
- P1n Pb10n-Pa10n (2)
- the ratio of the amounts of change P1 and P1n from the active power at the reference frequency fa is based on the slope R1 of the characteristic line fp14 and the slope R1n of the characteristic line fp14, as shown in equation (3).
- P1:P1n R1:R1n (3)
- the slope R1 and the slope R1n are represented by the equations (4) and (5).
- R1 (Pb10-Pa10)/(fb-fa)
- R1n (Pb10n-Pa10n)/(fb-fa) (5)
- the distribution characteristic of the active power supplied to the load 100 can be determined based on, for example, the impedance ratio between the plurality of nodes J2 to J2n and the corresponding plurality of nodes J1 to J1n. As a result, even if the plurality of distributed power supply groups 10 to 10n perform independent control, the output power frequencies of the plurality of distributed power supply groups 10 to 10n match.
- FIG. 4 is a diagram showing an example of reactive power-voltage droop characteristics showing the relationship between delayed reactive power Q and voltage V.
- the horizontal axis represents the delayed reactive power Q
- the vertical axis represents the voltage V.
- a characteristic line Vq14 shows the reactive power-voltage droop characteristic of the first power converter 14a
- a characteristic line Vq14n shows the reactive power-voltage droop characteristic of the first power converter 14an.
- the reactive power of the first power conversion unit 14a is the reactive power Qa10
- the reactive power of the first power conversion unit 14an is the reactive power Qa10n.
- the reactive power of the first power converter 14a is the reactive power Qb10
- the reactive power of the first power converter 14an is the reactive power Qb10n.
- the droop characteristic calculation unit 21 calculates the voltage V of the output voltage, that is, the amplitude, using the value of the reactive power calculated by the active/reactive power calculation unit 20.
- the droop characteristic calculation unit 21 lowers the voltage V when increasing the delay reactive power Q of the first power conversion unit 14a, and raises the voltage V when decreasing the delay reactive power Q. That is, the droop characteristic calculator 21 outputs a signal that lowers the amplitude when the delay reactive power Q increases and increases the amplitude when the delay reactive power Q decreases.
- the phase of the voltage waveform is calculated from the values of active power P and reactive power Q.
- the gate pulse generator 22 receives the gate signal for the first power converter 14a based on the command signal including the phase, frequency, and amplitude information of the voltage waveform input from the droop characteristic calculator 21. To generate.
- This gate signal is It is a signal that modulates the output voltage waveform of the first power conversion unit 14a, and is, for example, an On/Off signal of the semiconductor switch in the first power conversion unit 14a. Further, as the modulation method at this time, for example, pulse width modulation (PWM modulation) is used.
- PWM modulation pulse width modulation
- FIG. 5 is a diagram showing a configuration example of the control device 16c when the second inverter power supply 16 operates as a current source.
- the control device 16c includes an active/reactive power calculation unit 20, a gate pulse generation unit 22, an active/reactive power control unit 23, a current control device 24, and a voltage control device 25.
- the same components as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.
- the active/reactive power calculation unit 20 calculates the active power and the reactive power output by the second power conversion unit 16a based on the output voltage measurement value and the output current measurement value of the second power conversion unit 16a output by the voltage/current measurement unit 16b. Calculate the power value.
- the active/reactive power calculation unit 20 outputs the values of active power and reactive power to the active/reactive power control device 23.
- the active/reactive power control device 23 receives the output power command value preset as a fixed value, the active power output by the second power conversion unit 16a, and the reactive power value, and the output power value is the output power.
- the output current command value of the second power converter 16a is determined so as to follow the command value.
- the output current command value used by the active/reactive power control device 23 may be changed on a schedule. That is, the active/reactive power control device 23 sets the output power command value to a fixed value or a variable value that changes over time.
- the active/reactive power control device 23 outputs the calculated output current command value to the current control device 24.
- the current control unit 24 uses the output current measurement value of the second power conversion unit 16a and the output current command value calculated by the active/reactive power control device 23 to determine the output current of the second power conversion unit 16a as the command value.
- the current command value is determined so as to follow.
- the voltage control unit 25 determines the output voltage waveform of the second power conversion unit 16a using the output voltage measurement value of the second power conversion unit 16a and the voltage command value calculated by the active/reactive power control device 23. ..
- the command signal including the information of the output voltage waveform of the second power conversion unit 16a calculated by the voltage control device 25, that is, the information of the phase, the frequency, and the amplitude is input to the gate pulse generation unit 22.
- the gate pulse generator 22 generates a gate signal for the second power converter 16a based on a command signal including the phase, frequency, and amplitude information of the voltage waveform input from the voltage controller 25.
- the gate signal is a signal that modulates the output voltage waveform of the second power conversion unit 16a, and is, for example, an On/Off signal of the semiconductor switch in the second power conversion unit 16a. Further, as the modulation method at this time, for example, pulse width modulation (PWM modulation) is used. As a result, the second power converter 16a outputs power corresponding to the fixed power command value.
- PWM modulation pulse width modulation
- FIG. 6 is a diagram showing an operation example of the power supply system 1 according to the first embodiment.
- the left figure shows an output example of the distributed power supply group 10, and the right figure shows an output example of the distributed power supply group 10n.
- the vertical axis represents electric power
- the horizontal axis represents the first inverter power supply (power supply I) and the plurality of second inverter power supplies (power supply II).
- the output shares of the plurality of first inverter power supplies 14 to 14n are allocated based on the impedance ratio between the plurality of nodes J2 to J2n and the corresponding plurality of nodes J1 to J1n. That is, the output sharing among the plurality of first power converters 14a to 14an is automatically assigned according to the magnitude of the power required in the entire system and according to the characteristics shown in FIGS.
- the control device 14c controls the first power conversion unit 14a so as to supplement the active power change amount P1 (equation (1)) independently of the distributed power supply group 10n. Active power can be supplied according to output sharing.
- the frequency of the output power of the first power converter 14a at this time is fb.
- the control device 14cn controls the first power conversion unit 14an independently of the distributed power supply group 10 so as to compensate for the variation P1n (equation (2)) of active power. This makes it possible to supply active power according to the output sharing.
- the frequency of the first power conversion unit 14an at this time is fb.
- the control devices 14c to 14cn of the plurality of distributed power supply groups 10 to 10n can supplement the magnitude of the power required for the entire system at the same frequency even if they are independently controlled, In addition, it is possible to maintain a balance between power supply and demand in the grid.
- the plurality of second power conversion units 16 to 16n in each distributed power supply group 10 to 10n are operated as current sources. Therefore, it does not interfere with the voltage control of the plurality of first power converters 14a to 14an.
- the respective inverter power supplies 14 to 14n and 16 to 16n communicate with each other. Without doing so, it becomes possible to maintain the appropriate output sharing and establish the voltage and frequency of the grid.
- the rate of change of active power with respect to the output frequency of each of the plurality of first power conversion units 14a to 14an is made to correspond to the distribution characteristic of power supplied to the load.
- the plurality of control devices 14c to 14cn independently control the plurality of first power conversion units 14a to 14an, respectively, the magnitude of the power required for the entire system remains the same. It is possible to make up for it, and it is possible to maintain the power supply and demand balance within the grid.
- the power supply system 1 according to the second embodiment is different from the power supply system 1 according to the first embodiment in that an output instruction in the current source mode is given from the host controller.
- an output instruction in the current source mode is given from the host controller.
- FIG. 7 is a diagram showing the overall configuration of the power supply system 1 according to the second embodiment. As shown in FIG. 7, the power supply system 1 according to the second embodiment is different from the power supply system 1 according to the first embodiment in further including a host controller 30.
- the host controller 30 controls the plurality of second inverter power supplies 16 to 16n in each distributed power supply group 10 to 10n in an integrated manner.
- the host controller 30 may control all of the plurality of second inverter power supplies 16 to 16n, or may control some of the plurality of second inverter power supplies 16 to 16n.
- FIG. 8 is a diagram showing a configuration example of the control device 16c according to the second embodiment. As shown in FIG. 8, the power command value input to the active/reactive power control device 23 is input from the host control device 30.
- the host controller 30 collects information from the inverter power supplies 14-14n and 16-16n in each distributed power supply group 10-10n in the system to determine the power output command value of the second inverter power supply 16-16n. At this time, the host controller 30 may determine the power output command value by referring to information such as the voltage measurement value in the system and the load condition, for example.
- the power output command value of the second inverter power supplies 16 to 16n is determined by the host controller 8, it is possible to change the output sharing of the second inverter power supplies 16 to 16n depending on the system condition.
- the second inverter power supplies 16 to 16n can also be used to suppress power fluctuations in the system, it is possible to reduce the output capacity of the first inverter power supplies 14 to 14n required to cope with power fluctuations.
- the outputs of the second inverter power supplies 16 to 16n can be controlled by using the information on the system side, it is possible to perform more advanced system control such as improving the distribution of the system voltage, optimizing the power flow, and improving the system stability. Is possible.
- the first inverter power supplies 14 to 14n can be independently operated without being controlled by the host controller 30, and the plurality of second inverter power supplies 16 to 16n can be operated. It was decided to control by 30. As a result, steep power fluctuations can be suppressed by operating the first inverter power supplies 14 to 14n as voltage sources, so that the communication speed between the host controller 30 and the second inverter power supplies 16 to 16n can be further reduced. Become.
- the power supply system 1 according to the third embodiment is different from the power supply system 1 according to the first embodiment in that a voltage/current measuring device that measures the output voltage/current of the inverter power supply group is provided.
- a voltage/current measuring device that measures the output voltage/current of the inverter power supply group is provided.
- FIG. 9 is a diagram showing the overall configuration of the power supply system 1 according to the third embodiment.
- the power supply system 1 according to the third embodiment is different from the power supply system 1 according to the first embodiment in that it further includes voltage/current measuring devices 40 to 40n.
- the measured values of the voltage/current measuring devices 40 to 40n are shared by the second inverter power supplies 16 to 16n in the corresponding distributed power supply groups 10 to 10n.
- the power command value input to the active/reactive power control unit 23 inside the control device 16c is determined by using the output power of the entire distributed power supply group to which the second inverter power supply 16 belongs.
- the power command value is a value obtained by apportioning the output power of the entire distributed power supply group by the rated output values of the plurality of second inverter power supplies 16.
- FIG. 10 is a diagram showing an operation example of the power supply system 1 according to the third embodiment.
- the left figure shows an output example of the distributed power supply group 10, and the right figure shows an output example of the distributed power supply group 10n.
- the vertical axis represents electric power
- the horizontal axis represents the first inverter power supply (power supply I) and the plurality of second inverter power supplies (power supply II).
- a plurality of second inverter power supplies 16 can also be used to suppress power fluctuations.
- the output power command of the plurality of second inverter power supplies 16 is changed according to the output power of the entire distributed power supply group.
- the plurality of second inverter power supplies 16 can also be used for suppressing the power fluctuation. Therefore, the power fluctuations shared by the first inverter power supplies 14 to 14n are reduced, and the output capacity of the first inverter power supplies 14 to 14n required to cope with the power fluctuations can be reduced. Further, since it is not necessary to install a host controller and a communication network between the host controller and each inverter power supply, the influence of the communication speed between the devices can be suppressed.
- the power supply system 1 according to the fourth embodiment is different from the power supply system 1 according to the first embodiment in that the outputs of the plurality of second inverter power supplies 16 to 16n are proportional to the corresponding first inverter power supplies 14 to 14n. To do.
- differences from the power supply system 1 according to the first embodiment will be described.
- FIG. 11 is a diagram showing the overall configuration of the power supply system 1 according to the fourth embodiment.
- the power supply system 1 according to the fourth embodiment includes a first inverter power supply 14 included in the same distributed power supply group among a plurality of distributed power supply groups 10 to 10n, and a plurality of first inverter power supplies. It differs from the power supply system 1 according to the first embodiment in that the two-inverter power supply 16 is connected by a signal line.
- the power command value input to the active/reactive power control unit 23 inside the control device 16c is determined using the outputs of the first inverter power supplies 14 belonging to the same distributed power supply group. ..
- the power command value is a value obtained by multiplying the output power of the first inverter power supply 14 by a coefficient according to the rated output values of the plurality of second inverter power supplies 16, for example.
- the outputs of the plurality of second inverter power supplies 16 to 16n are proportional to the corresponding first inverter power supplies 14 to 14n. Therefore, without using the voltage/current measuring devices 40 to 40n (FIG. 9), the plurality of second inverter power supplies 16 can also be used to suppress power fluctuations. Also in this case, since it is not necessary to install a host controller and a communication network between the host controller and each inverter power supply, the influence of the communication speed between the devices can be suppressed.
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Abstract
Description
図1は、第1実施形態に係る電力供給システム1の全体構成を示す図である。図1に示すように、電力供給システム1は、負荷100に電力を供給するインバータ系統であり、複数の分散型電源群10~10nと、複数の変圧器12~12nと、を備えている。図1には更に負荷100と、第1母線L1と、複数の第2母線L2~L2nと、複数のノードJ1~J1nと、複数のノードJ2~J2nとが図示されている。複数の第2母線L2~L2nは、複数のノードJ1~J1nを介して第1母線L1に並列接続される。
P1=Pb10-Pa10 (1)
P1n=Pb10n-Pa10n (2)
P1:P1n=R1:R1n (3)
ここで、傾きR1と傾きR1nとは(4)、(5)式で示される。
R1=(Pb10-Pa10)/(fb-fa) (4)
R1n=(Pb10n-Pa10n)/(fb-fa) (5)
第1電力変換部14aの出力電圧波形を変調する信号であり、例えば第1電力変換部14aにおける半導体スイッチのOn/Off信号である。また、この時の変調方法としては、例えばパルス幅変調(PWM変調)が用いられる。
第2実施形態に係る電力供給システム1は、電流源モードの出力指示を上位制御装置から与える点で、第1形態に係る電力供給システム1と相違する。以下では、第1形態に係る電力供給システム1と相違する点に関して説明する。
第3実施形態に係る電力供給システム1は、インバータ電源群の出力電圧・電流を計測する電圧・電流計測装置が設けられている点で、第1形態に係る電力供給システム1と相違する。以下では、第1形態に係る電力供給システム1と相違する点に関して説明する。
第4実施形態に係る電力供給システム1は、複数の第2インバータ電源16~16nの出力を対応する第1インバータ電源14~14nに比例させる点で、第1形態に係る電力供給システム1と相違する。以下では、第1形態に係る電力供給システム1と相違する点に関して説明する。
Claims (10)
- 負荷に供給する電力の分配特性に従い電力を供給する複数の第1電力変換部と、
前記複数の第1電力変換部それぞれの出力周波数に対する有効電力の変化率を前記分配特性に対応させ、前記変化率に基づき前記複数の第1電力変換部をそれぞれ制御する複数の制御装置と、
を備える、電力供給システム。 - 前記電力の分配特性は、前記複数の第1電力変換部のそれぞれが第1母線に接続されるまでのインピーダンスに応じた電力の分配比率である、請求項1に記載の電力供給システム。
- 前記複数の制御装置それぞれは、制御対象となる前記第1電力変換部の出力電圧の振幅を無効電力と関連付けた特性に基づき出力させる、請求項1又は2に記載の電力供給システム。
- 前記負荷の接続される第1母線に並列接続される複数の第2母線のそれぞれに、前記複数の第1電力変換部が接続されており、
前記複数の第2母線のそれぞれに接続され、出力電力指令値を所定値とする複数の第2電力変換部を更に備える、請求項1乃至3のいずれか一項に記載の電力供給システム。 - 前記複数の第2電力変換部に対する出力電力指令値を固定値、或いは時間経過に従い変化する可変値とする、請求項4に記載の電力供給システム。
- 前記複数の第2電力変換部に対する出力電力指令値を生成する上位制御装置を更に備える、請求項4に記載の電力供給システム。
- 前記複数の第2電力変換部に対する出力電力指令値を前記第2母線毎の出力電力に基づき生成する、請求項4に記載の電力供給システム。
- 前記複数の第2電力変換部に対する出力電力指令値を前記第2母線毎の前記第1電力変換部の出力電力に基づき生成する、請求項4に記載の電力供給システム。
- 前記複数の第1電力変換部及び前記複数の第2電力変換部は、インバータ電源である、請求項4乃至8のいずれか一項に記載の電力供給システム。
- 負荷に供給する電力の分配特性に従い電力を供給する複数の第1電力変換部を備える電力供給システムの制御方法であって、
前記複数の第1電力変換部それぞれの出力周波数に対する有効電力の変化率を前記分配特性に対応させ、前記変化率に基づき前記複数の第1電力変換部をそれぞれ制御する電力供給システムの制御方法。
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