WO2022208809A1 - Système de conversion d'énergie - Google Patents

Système de conversion d'énergie Download PDF

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Publication number
WO2022208809A1
WO2022208809A1 PCT/JP2021/014039 JP2021014039W WO2022208809A1 WO 2022208809 A1 WO2022208809 A1 WO 2022208809A1 JP 2021014039 W JP2021014039 W JP 2021014039W WO 2022208809 A1 WO2022208809 A1 WO 2022208809A1
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WO
WIPO (PCT)
Prior art keywords
inverter device
multiple inverter
phase
conversion system
power generation
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Application number
PCT/JP2021/014039
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English (en)
Japanese (ja)
Inventor
一誠 深澤
雅博 木下
Original Assignee
東芝三菱電機産業システム株式会社
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Priority to PCT/JP2021/014039 priority Critical patent/WO2022208809A1/fr
Publication of WO2022208809A1 publication Critical patent/WO2022208809A1/fr

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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
    • H02M7/493—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 the static converters being arranged for operation in parallel

Definitions

  • the present disclosure relates to a power conversion system, and more particularly to a power conversion system suitable for use in a photovoltaic power generation system.
  • Patent Document 1 discloses a multiple inverter device that converts the DC voltage from the first and second DC capacitors into a three-phase AC voltage.
  • This multiple inverter device consists of a plurality of units connected in parallel to the first and second DC capacitors. Each unit is composed of an open delta-connected transformer with a secondary winding connected to an AC circuit, and first and second inverters (three-phase inverters).
  • the first inverter has an input terminal connected to the first DC capacitor and an output terminal connected to one end of the primary winding of the open delta transformer.
  • the second inverter has an input terminal connected to the second DC capacitor and an output terminal connected to the other end of the primary winding of the open delta transformer.
  • Each unit is connected to a common AC circuit through an open delta transformer.
  • the output capacity can be increased by multiplexing the inverters.
  • the use of the multiplexed inverter device described in Patent Document 1 will increase the cost of the photovoltaic power generation system.
  • the present disclosure has been made in view of the problems described above, and includes a power conversion system that converts DC power supplied from a photovoltaic power generation facility into three-phase AC power, and includes a single open delta connection transformer.
  • the purpose is to make it possible to increase the output capacity by using
  • a power conversion system is a system that converts DC power supplied from a photovoltaic power generation facility into three-phase AC power, and includes a single open delta connection transformer connected to an AC power system and a first A multiple inverter device and a second multiple inverter device are provided.
  • the first multiple inverter device and the second multiple inverter device both have a plurality of three-phase inverters connected in parallel, and are configured by connecting DC capacitors in parallel to the input terminals of the plurality of three-phase inverters. .
  • the photovoltaic power generation facility has a first photovoltaic power generation facility in which a plurality of solar cell groups are connected in parallel, and a second photovoltaic power generation facility in which a plurality of solar cell groups are connected in parallel.
  • a first multiple inverter arrangement has an input connected to the first photovoltaic power plant and an output connected to one end of the primary winding of each phase of the open delta connected transformer.
  • a second multiple inverter arrangement has an input connected to the second photovoltaic power plant and an output connected to the other end of the primary winding of each phase of the open delta connected transformer.
  • both the first multiple inverter device and the second multiple inverter device are configured by connecting the output terminals of a plurality of three-phase inverters to each other via an AC reactor for each common phase.
  • a DC switch may be provided between the input section of the first multiplex inverter device and the first DC power supply, and between the input section of the second multiplex inverter device and the second DC power supply, respectively.
  • the plurality of solar cell groups forming the first photovoltaic power generation facility and the plurality of solar cell groups forming the second photovoltaic power generation facility may each be provided with a protection device that cuts off a short-circuit current.
  • AC capacitors may be provided between the output of the first multiple inverter device and the open delta connection transformer, and between the output of the second multiple inverter device and the open delta connection transformer. good.
  • the power conversion system may include a control device that cooperatively controls the first multiple inverter device and the second multiple inverter device.
  • the control device may cause the first multiple inverter device and the second multiple inverter device to output voltages having different signs.
  • the power conversion system according to the present disclosure may be applied to DC power supply equipment having a first DC power supply and a second DC power supply instead of the solar power generation equipment.
  • the input of the first multiple inverter device is connected to the first DC power supply
  • the input of the second multiple inverter device is connected to the second DC power supply.
  • the DC power supply equipment may be a distributed power supply, or more specifically, a storage battery equipment having a first storage battery and a second storage battery.
  • FIG. 1 is a circuit diagram showing the configuration of a power conversion system according to an embodiment of the present disclosure
  • FIG. 4 is a circuit diagram showing an example of the structure of a unit inverter
  • FIG. 4 is a diagram showing an example of coordinated control of the output voltage of the first multiple inverter device and the output voltage of the second multiple inverter device by the control device
  • FIG. 4 is a circuit diagram showing a configuration of a modification of the power conversion system of the embodiment of the present disclosure
  • FIG. 1 is a circuit diagram showing the configuration of the power conversion system according to the embodiment of the present disclosure.
  • the power conversion system 101 of the first embodiment is a system that converts DC power supplied from the photovoltaic power generation facility 50 into three-phase AC power.
  • the photovoltaic power generation facility 50 consists of two systems of a first photovoltaic power generation facility 51 and a second photovoltaic power generation facility 52 .
  • the first photovoltaic power generation facility 51 and the second photovoltaic power generation facility 52 are electrically insulated or connected via a resistor.
  • the first photovoltaic power generation facility 51 is configured by connecting a plurality of photovoltaic cell groups 51-1 to 51-n in parallel (where n is any natural number equal to or greater than 2).
  • the second photovoltaic power generation facility 52 is also configured by connecting a plurality of photovoltaic cell groups 52-1 to 52-m in parallel (where m is any natural number equal to or greater than 2).
  • Each solar cell group is configured by connecting a plurality of solar cells in series and in parallel.
  • a power conversion system 101 includes a single open delta connection transformer 30 connected to an AC power system, and a pair of multiple inverter devices 10 and 20 connected to the open delta connection transformer 30 .
  • a first multiple inverter device 10 and a second multiple inverter device 20 are connected to the open delta connection transformer 30 .
  • the first multiple inverter device 10 includes a pair of unit inverters 11a and 11b.
  • the number of unit inverters constituting the first multiple inverter device 10 may be plural, and therefore may be three or more.
  • the unit inverters 11a and 11b are voltage source inverters having switching elements composed of self arc-extinguishing power transistors such as MOSFETs and IGBTs, and are configured as three-phase inverters for converting DC power into three-phase AC power.
  • the unit inverters 11a and 11b have the same structure and are connected in parallel.
  • the first multiple inverter device 10 includes a pair of AC reactors 13a and 13b. Output terminals ua1, va1, wa1 of the unit inverter 11a and output terminals ub1, vb1, wb1 of the unit inverter 21b are connected to each other via AC reactors 13a, 13b for each common phase.
  • the AC reactor 13a on the unit inverter 11a side and the AC reactor 13b on the unit inverter 11b side may have the same capacity or may have different capacities.
  • An AC capacitor 17 is provided between the intermediate point between the AC reactors 13 a and 13 b connected in series and the transformer 30 .
  • the AC capacitor 17 forms a filter circuit together with the AC reactors 13a and 13b in order to suppress output current ripples of the unit inverters 11a and 11b due to switching of the switching elements.
  • the first multiple inverter device 10 includes a pair of DC capacitors 12a and 12b.
  • the DC capacitors 12a and 12b are connected in parallel between the input terminal of the unit inverter 11a and the input terminal of the unit inverter 11a.
  • the DC capacitor 12a on the side of the unit inverter 11a and the DC capacitor 12b on the side of the unit inverter 11b may have the same capacity or may have different capacities.
  • the first multiple inverter device 10 has an input section 10in to which DC power is input, and an output section 10out to output three-phase AC power.
  • the input 10in is connected to the midpoint between the parallel-connected DC capacitors 12a and 12b.
  • the output section 10out is connected to the AC capacitor 17 .
  • a current sensor 14 is provided between the AC capacitor 17 and the output section 10out.
  • the second multiple inverter device 20 has the same configuration as the first multiple inverter device 10.
  • the second multiple inverter device 20 includes a pair of unit inverters 21a and 21b.
  • the number of unit inverters constituting the second multiple inverter device 20 may be plural, and therefore may be three or more. Also, the number of unit inverters constituting the second multiple inverter device 20 may be different from the number of the first multiple inverter devices 10 .
  • FIG. 2 shows an example of the structure of the unit inverter.
  • FIG. 2 shows an example of the structure of the unit inverter 11a representing the unit inverters 11a, 11b, 21a, and 21b.
  • the unit inverter 11a may be configured as a three-phase, two-level inverter as shown in Example 1 of FIG.
  • the unit inverter 11a when the unit inverter 11a is a three-phase, three-level inverter, the DC capacitor 12a is composed of a positive electrode side capacitor 12aP and a negative electrode side capacitor 12aN.
  • the unit inverters 11a, 11b and the unit inverters 21a, 21b may have the same structure or may have different structures.
  • the unit inverters 11a and 11b may be 3-phase 3-level inverters
  • the unit inverters 21a and 21b may be 3-phase 2-level inverters.
  • the second multiple inverter device 20 has a pair of AC reactors 23a and 23b.
  • the output terminals ua2, va2, wa2 of the unit inverter 21a and the output terminals ub2, vb2, wb2 of the unit inverter 21b are connected to each other via AC reactors 23a, 23b for each common phase.
  • the AC reactor 23a on the unit inverter 21a side and the AC reactor 23b on the unit inverter 21b side may have the same capacity or may have different capacities.
  • An AC capacitor 27 is provided between the intermediate point between the AC reactors 23 a and 23 b connected in series and the transformer 30 .
  • the AC capacitor 27 forms a filter circuit together with the AC reactors 23a and 23b in order to suppress output current ripples of the unit inverters 21a and 21b due to switching of the switching elements.
  • the second multiple inverter device 20 includes a pair of DC capacitors 22a and 22b.
  • the DC capacitors 22a and 22b are connected in parallel between the input terminal of the unit inverter 21a and the input terminal of the unit inverter 21b.
  • the DC capacitor 22a on the side of the unit inverter 21a and the DC capacitor 22b on the side of the unit inverter 21b may have the same capacity or may have different capacities.
  • the second multiple inverter device 20 has an input section 20in to which DC power is input, and an output section 20out to output three-phase AC power.
  • the input section 20in is connected to the midpoint between the parallel-connected DC capacitors 22a and 22b.
  • the output section 20out is connected to the AC capacitor 27 .
  • a current sensor (not shown) is provided between the AC capacitor 17 and the output section 20out. However, since the current flowing through the current sensor of the first inverter 10 and the current flowing through the current sensor of the second inverter 20 have the same magnitude and opposite sign, one of the current sensors can be omitted.
  • An open-delta-connected transformer (hereinafter simply referred to as a transformer) 30 has primary-side windings 31u, 31v, and 31w that are open-delta-connected, and secondary-side windings 32u, 32v, and 32w that are star-connected. It is a three-phase transformer.
  • u, v, and w included in the reference numerals attached to each winding mean U-phase, V-phase, and W-phase, respectively.
  • the first multiple inverter device 10 and the second multiple inverter device 20 have respective outputs 10out and 20out connected to the primary windings 31u, 31v and 31w of the transformer 30, respectively.
  • the output section 10out of the first multiple inverter device 10 is connected to the winding start terminals of the primary windings 31u, 31v, and 31w
  • the output section 20out of the second multiple inverter device 20 is connected to the primary winding 31u. , 31v and 31w.
  • Secondary windings 32u, 32v, and 32w are connected to an AC power system.
  • a first photovoltaic power generation facility 51 is connected to the input section 10in of the first multiple inverter device 10 .
  • a DC switch 16 is provided between the input section 10in and the first photovoltaic power generation equipment 51 .
  • the input section 20in of the second multiplex inverter device 20 is connected to the second photovoltaic power generation facility 52 .
  • a DC switch 26 is provided between the input section 20in and the second photovoltaic power generation equipment 52 . The DC switches 16 and 26 are turned on when power generation by the photovoltaic power generation equipment 50 is started, and are opened when power generation is finished.
  • DC fuses 18-1 to 18-n are provided for each of the solar cell groups 51-1 to 51-n.
  • DC fuses 28-1 to 28-m are also provided between the DC switch 26 and the second solar power generation equipment 52 for each of the solar cell groups 52-1 to 52-m.
  • a DC fuse functions as a protective device for interrupting short-circuit currents. By providing a DC fuse for each solar cell group, a DC fuse with a small capacity can be used as each individual DC fuse.
  • circuit breakers and load switches can also be cited as examples of protective devices.
  • the power conversion system 101 includes a control device 40 .
  • the control device 40 transmits gate signals to the unit inverters 11 a and 11 b that constitute the first multiple inverter device 10 . More specifically, the control device 40 supplies a common gate signal GS1 to both unit inverters 11a and 11b to drive the respective switching elements.
  • both unit inverters 11a and 11b theoretically output voltage pulses with the same timing.
  • a slight timing shift occurs between the output voltage pulse of the unit inverter 11a and the output voltage pulse of the unit inverter 11b.
  • AC reactors 13a and 13b are provided between the output terminal of the unit inverter 11a and the output terminal of the unit inverter 11b. The AC reactors 13a and 13b suppress circulating currents between the unit inverters 11a and 11b caused by timing deviations of the output voltage pulses.
  • the control device 40 also transmits gate signals to the unit inverters 21 a and 21 b that make up the second multiplex inverter device 20 . More specifically, the control device 40 supplies a common gate signal GS2 to both unit inverters 21a and 21b to drive the respective switching elements. At this time, although a slight deviation may occur in the timing of the output voltage pulse between the unit inverters 21a and 21b, the circulating current generated between the unit inverters 21a and 21b due to the deviation is suppressed by the AC reactors 23a and 23b.
  • the control device 40 cooperatively controls the output voltage of the first multiple inverter device 10 and the output voltage of the second multiple inverter device 20 .
  • FIG. 3 is a diagram showing an example of the cooperative control.
  • the control device 40 generates a carrier wave based on a carrier frequency that determines the switching frequency, and has a phase difference of 180 degrees between the sine wave of the first voltage command value and the sine wave of the first voltage command value.
  • a sine wave of the second voltage command value is generated.
  • the gate signal GS1 to be supplied to the first multiple inverter device 10 is generated.
  • a gate signal GS2 to be supplied to the multiple inverter device 20 is generated.
  • the output current of the first multiple inverter device 10 and the output current of the second multiple inverter device 20 have different signs. Therefore, the output power of the first multiple inverter device 10 and the output power of the second multiple inverter device 20 have the same sign, and the two output powers are combined. As a result, the output capacity of the power conversion system 101 as a whole increases.
  • the gate signals GS1 and GS2 generated as described above a phase difference occurs in the switching timings of the in-phase switching elements of the first multiple inverter device 10 and the second multiple inverter device 20 .
  • the voltages applied to the primary windings 31u, 31v, and 31w of the transformer 30 are stepped with respect to the voltages output from the first multiple inverter device 10 and the second multiple inverter device 20, respectively.
  • the unit inverters 11a and 11b of the first multiple inverter device 10 are n1 level circuits and the unit inverters 21a and 21b of the second multiple inverter device 20 are n2 level circuits
  • the voltage is applied to the primary side of the transformer 30.
  • the voltage becomes (n1+n2-1) level.
  • output harmonic voltages and currents on the secondary side of transformer 30 are suppressed.
  • the output current of each phase of the first multiple inverter device 10 and the output current of each phase of the second multiple inverter device 20 have the same magnitude and opposite signs.
  • the current sensor 14 may be provided only in the first multiple inverter device 10 (or only in the second multiple inverter device 20). That is, the number of installed current sensors can be reduced.
  • the output current of the second multiplex inverter device 20 is also determined, so that the flow of circulating current on the AC side can be prevented. can be suppressed.
  • the input terminal of the unit inverter 21a and the input terminal of the unit inverter 21b are connected in parallel, and a common DC voltage is input from the second photovoltaic power generation equipment 52. Therefore, the circulating current generated between the unit inverters 21a and 21b is is suppressed. Furthermore, since the DC capacitors 22a and 22b are connected in parallel to the input terminals of the unit inverters 21a and 21b, the switching ripple caused by the switching of the switching elements is absorbed by the DC capacitors 22a and 22b.
  • the power conversion system 101 of this embodiment is a power conversion system having a DC fuse (protective device) that cuts off short-circuit current on the DC side.
  • a DC fuse protective device
  • the larger the capacity the greater the short-circuit current that flows through the DC fuse when the DC input is short-circuited, making it difficult to select a DC fuse with a sufficient short-circuit capacity.
  • the transformer 30 with an open winding on the primary side is used, and the primary winding of the transformer 30 is connected to the two systems of multiple inverter devices 10 and 20.
  • the DC sides of the multiple inverter devices 10 and 20 are independent of each other.
  • the voltage of the solar cell decreases at night. For this reason, if the multiple inverter devices 10 and 20 are left connected to the photovoltaic power generation facility 50, if the voltage of the solar cells falls below the minimum DC voltage of the multiple inverter devices 10 and 20 determined by the AC voltage, the solar cells will be removed from the system. power flows backwards.
  • One way to prevent this problem is to have a switch on the ac side and turn it on and off daily so that it disconnects from the grid side at night.
  • the required rated current increases, making it difficult to select an AC switch with a sufficient rated current.
  • the transformer 30 with an open winding on the primary side is used, and the primary winding of the transformer 30 is connected to the two systems of multiple inverter devices 10 and 20.
  • the DC sides of the multiple inverter devices 10 and 20 are independent of each other, and DC switches 16 and 26 are provided between the photovoltaic power generation facilities 51 and 52 to which they are connected, respectively.
  • the multiple inverter devices 10 and 20 are connected to the photovoltaic power generation facilities 51 and 52 divided into two, respectively, so that the DC switching devices installed on the DC sides of the multiple inverter devices 10 and 20 are connected.
  • the rated current of the devices 16 and 26 can be small.
  • the rated current of the DC switches 16 and 26 can be small. Further, according to the configuration of the power conversion system 101 of the present embodiment, since the short-circuit current on the DC side is small, it becomes easy to select the DC switches 16 and 26 that can cut off the short-circuit current on the DC side, and the DC fuse 18 -1 to 18-n and 28-1 to 28-m also have the effect of being easy to take protective cooperation.
  • the power conversion system is applied to the photovoltaic power generation facility, but the power conversion system according to the present disclosure includes a first DC power supply and a second DC power supply instead of the photovoltaic power generation facility. It may be applied to a DC power supply facility with The DC power supply facility may be a distributed power supply, or more specifically, a storage battery facility having a first storage battery and a second storage battery.
  • FIG. 4 is a circuit diagram showing a configuration of a modification of the power conversion system according to the embodiment of the present disclosure.
  • the power conversion system 102 of the modification is applied to the storage battery equipment 60 .
  • the storage battery equipment 60 comprises a first storage battery 61 and a second storage battery 62 electrically insulated from each other.
  • the first storage battery 61 is connected to the input section 10in of the first multiple inverter device 10 via a DC fuse 18 and a DC switch as protective equipment.
  • the second storage battery 62 is connected to the input section 20in of the second multiple inverter device 20 via a DC fuse 28 and a DC switch as protective equipment.
  • the single open delta connection transformer 30 is used to increase the output capacity. can be made possible.
  • First multiple inverter device 20 Second multiple inverter device 11a, 11b, 21a, 21b Unit inverter (three-phase inverter) 12a, 12b, 22a, 22b DC capacitors 13a, 13b, 23a, 23b AC reactor 14 Current sensors 16, 26 DC switches 17, 27 AC capacitors 18, 18-1 to 18-n, 28, 28-1 to 28- m DC fuse (protective device) 30 Open delta connection transformers 31u, 31v, 31w Primary windings 32u, 32v, 32w Secondary windings 40 Control device 50 Photovoltaic power generation equipment 51 First photovoltaic power generation equipment 52 Second photovoltaic power generation equipment 51-1 ⁇ 51-n, 52-1 to 52-m solar cell group 60 storage battery equipment 61 first storage battery 62 second storage battery 101, 102 power conversion system

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

La présente invention concerne un système de conversion d'énergie qui convertit l'énergie CC apportée depuis une installation de production d'énergie solaire en énergie CA triphasée, et comprend un transformateur de connexion delta ouvert qui est connecté à un système d'alimentation CA, un premier dispositif onduleur de multiplexage et un second dispositif onduleur de multiplexage. Le premier dispositif onduleur de multiplexage et le second dispositif onduleur de multiplexage comprennent chacun une pluralité d'onduleurs triphasés connectés en parallèle, les bornes de sortie de la pluralité d'onduleurs triphasés étant connectées entre elles dans chaque phase commune par l'intermédiaire d'un réacteur CA, et un condensateur CC est connecté en parallèle aux bornes d'entrée de la pluralité d'onduleurs triphasés. Le premier dispositif onduleur de multiplexage comprend une unité d'entrée qui est connectée à une première installation de production d'énergie solaire, et une unité de sortie qui est connectée à une extrémité d'un enroulement primaire de chaque phase du transformateur de connexion delta ouvert. Le second dispositif onduleur de multiplexage comprend une unité d'entrée qui est connectée à une seconde installation de production d'énergie solaire, et une unité de sortie qui est connectée à l'autre extrémité de l'enroulement primaire de chaque phase du transformateur de connexion delta ouvert.
PCT/JP2021/014039 2021-03-31 2021-03-31 Système de conversion d'énergie WO2022208809A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5120533A (fr) * 1974-08-12 1976-02-18 Mitsubishi Electric Corp
JPH02193570A (ja) * 1988-10-21 1990-07-31 Fuji Electric Co Ltd インバータの制御方法
JP3237983B2 (ja) * 1994-01-28 2001-12-10 隆夫 川畑 多重インバータ装置
JP2014033519A (ja) * 2012-08-02 2014-02-20 Mitsubishi Electric Corp パワーコンディショナ
JP2017535237A (ja) * 2014-10-27 2017-11-24 エスエムエイ ソーラー テクノロジー アクティエンゲゼルシャフトＳＭＡ Ｓｏｌａｒ Ｔｅｃｈｎｏｌｏｇｙ ＡＧ 電動式過電流保護部を有するコンバイナボックス

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5120533A (fr) * 1974-08-12 1976-02-18 Mitsubishi Electric Corp
JPH02193570A (ja) * 1988-10-21 1990-07-31 Fuji Electric Co Ltd インバータの制御方法
JP3237983B2 (ja) * 1994-01-28 2001-12-10 隆夫 川畑 多重インバータ装置
JP2014033519A (ja) * 2012-08-02 2014-02-20 Mitsubishi Electric Corp パワーコンディショナ
JP2017535237A (ja) * 2014-10-27 2017-11-24 エスエムエイ ソーラー テクノロジー アクティエンゲゼルシャフトＳＭＡ Ｓｏｌａｒ Ｔｅｃｈｎｏｌｏｇｙ ＡＧ 電動式過電流保護部を有するコンバイナボックス

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