WO2024047841A1 - 電力変換システム - Google Patents
電力変換システム Download PDFInfo
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- WO2024047841A1 WO2024047841A1 PCT/JP2022/032946 JP2022032946W WO2024047841A1 WO 2024047841 A1 WO2024047841 A1 WO 2024047841A1 JP 2022032946 W JP2022032946 W JP 2022032946W WO 2024047841 A1 WO2024047841 A1 WO 2024047841A1
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- power
- discharge
- conversion system
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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
- H02M1/0048—Circuits or arrangements for reducing losses
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
-
- 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
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
Definitions
- the present disclosure relates to a power conversion system, and particularly to one having a capacitor on the DC power supply side of a power converter.
- Patent Document 1 discloses a power conversion system.
- a capacitor and the charge accumulated in the capacitor are connected between a positive DC line (also called a positive bus) and a negative DC line (also called a negative bus) that are connected to the input terminal of a power converter.
- a discharge circuit for discharging is provided in parallel.
- the discharge circuit is configured only with a discharge resistor, and is not configured with a discharge resistor and a switch connected in series. While DC power is supplied from the DC power supply to the power converter, a relatively high DC voltage is always applied to the discharge resistor. Therefore, it is necessary to increase the capacity of the discharge resistor as a whole, and this increases the loss of the power conversion system as the loss of the discharge resistor increases. Furthermore, increasing the capacity per discharge resistor increases the cost of the discharge resistor. When a plurality of discharge resistors each having a relatively small capacity are connected in series, the number of discharge resistors increases. In addition to increasing the overall cost of the discharge resistor, the installation space is also increased.
- the present disclosure has been made to solve the above-mentioned problems, and aims to provide a low-cost power conversion system that can achieve low loss and space saving.
- a power conversion system includes a power converter that converts DC power input from a DC power source into AC power or DC power, and a positive DC line connected to an input terminal of the power converter.
- a capacitor provided between the negative DC line, a ground line connecting the negative DC line and the ground potential and provided with a first grounding resistor, and a ground potential side of the positive DC line and the first grounding resistor. and a discharge switch that is provided on the discharge line and is turned on when discharging the residual charge of the capacitor.
- the second aspect further has the following characteristics.
- a second grounding resistor is provided on the grounding line closer to the ground potential than the connection point with the discharge line.
- the third aspect further has the following characteristics in addition to the first or second aspect.
- a first disconnection switch that is turned off when disconnecting the DC power source from the power converter is provided on each of the positive DC line and the negative DC line.
- a second disconnection switch that is turned OFF when disconnecting the power converter from the power system is provided on the output line from the power converter to the power system.
- the power conversion system includes a control device that controls ON or OFF of a discharge switch, a first disconnection switch, and a second disconnection switch. The control device is configured to turn on the discharge switch after turning off the first disconnection switch and the second disconnection switch.
- the discharge switch when the discharge switch is turned on, the charge accumulated in the capacitor is discharged by the first grounding resistor provided in the grounding line. That is, the first grounding resistor can also be used as a discharge resistor. Thereby, the discharge resistor conventionally provided between the positive DC line and the negative DC line can be omitted. Furthermore, while DC power is supplied from the DC power supply to the power converter, by turning off the discharge switch, a relatively high DC voltage is not always applied to the first grounding resistor, so the first There is no need to increase the capacity of the first grounding resistor. Therefore, it is possible to realize cost reduction and space saving of the power conversion system. Moreover, the loss of the power conversion system can be reduced by the amount of the conventional discharge resistor.
- the second grounding resistor even if the negative electrode DC line has a ground fault, a short circuit will not occur, so safety during discharge can be improved.
- the residual charge in the capacitor can be reliably discharged by opening and closing various switches of the control device.
- FIG. 1 is a schematic diagram for explaining a configuration example of a power conversion system according to Embodiment 1.
- FIG. 7 is a schematic diagram for explaining a configuration example of a power conversion system according to a second embodiment.
- FIG. 1 is a diagram for explaining a configuration example of a power conversion system 1 according to the first embodiment. Note that the discharge resistor Rd indicated by a broken line in FIG. 1 is provided in a conventional power conversion system, and is not provided in the power conversion system 1 of this embodiment.
- the power conversion system 1 includes a power converter 11.
- the power converter 11 is a DC/AC converter that converts DC power supplied from the DC power supply 2 into AC power and supplies the converted AC power to the power system 3.
- the power converter 11 includes a plurality of switching elements 11a and a gate circuit (not shown) that supplies a gate drive signal to each switching element 11a.
- the switching element 11a is, for example, an IGBT or a MOSFET.
- the DC power source 2 may be, for example, a solar cell or a storage battery.
- the DC power supply 2 may be a DC power system including a wind power generator and an AC/DC converter.
- a positive DC line 12 and a negative DC line 13 are connected to the input terminal of the power converter 11.
- the positive DC line 12 is connected to the positive pole of the DC power supply 2 via a switch 12a
- the negative DC line 13 is connected to the negative pole of the DC power supply 2 via a switch 13a.
- the switches 12a and 13a correspond to first disconnection switches that are turned off when disconnecting the DC power supply 2 from the power converter 11.
- the switches 12a and 13a can be interposed in the positive DC line 12 and the negative DC line 13.
- a capacitor 14 is provided between the positive DC line 12 and the negative DC line 13.
- One end of a ground line 15 is connected to the negative DC line 13 .
- the other end of the ground line 15 is connected to the ground potential Gp.
- a first grounding resistor 15a and a grounding switch 15b are provided in series on the grounding line 15 from the connection point with the negative DC line 13. That is, the negative DC line 13 is grounded via a first grounding resistor 15a and a grounding switch 15b connected in series.
- the first grounding resistor 15a can be composed of a plurality of resistors.
- the grounding switch 15b is normally ON. Note that the grounding switch 15b is not essential, and the negative DC line 13 may be grounded via the grounding resistor 15a.
- the power conversion system 1 of this embodiment includes a discharge line 16 in which a discharge switch 16a is interposed. One end of the discharge line 16 is connected to the positive DC line 12. The other end of the discharge line 16 is connected between the first grounding resistor 15a of the grounding line 15 and the grounding switch 15b.
- the discharge switch 16a is turned on when discharging the charge accumulated in the capacitor 14, and is normally turned off.
- the output terminal of the power converter 11 is connected to the power system 3 via a three-phase output line 17.
- Each output line 17 is provided with a switch 17a.
- the switch 17a corresponds to a second disconnection switch that is turned off when disconnecting the power system 3 from the power converter 11.
- the output line 17 may be single-layer or two-phase.
- the power conversion system 1 includes a control device 18.
- the control device 18 controls the power conversion system 1 in an integrated manner by controlling the gate circuit of the power converter 11 and the ON/OFF operations (opening/closing operations) of various switches 12a, 13a, 15b, 16a, 17a. It is composed of
- Each function of the control device 18 can be realized by a processing circuit.
- the processing circuitry may include at least one processor 18a and at least one memory 18b, or may include at least one dedicated hardware (not shown).
- each function of the control device 18 is realized by software, firmware, or a combination of software and firmware.
- At least one of the software and firmware is written as a program.
- At least one of software and firmware is stored in at least one memory 18b.
- At least one processor 18a implements each function of the control device 18 by reading and executing a program stored in at least one memory 18b.
- At least one processor 18a is also referred to as a central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, or DSP.
- the at least one memory 18b is a non-volatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, EEPROM, etc., a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD, etc.
- Switches 12a, 13a, and 17a are turned on to supply DC power from DC power supply 2 to power converter 11.
- the power converter 11 converts DC power into AC power by driving each switching element 11a based on a command input from the control device 18, and supplies the converted AC power to the power system 3. While power is being supplied to the power system 3 in this manner, the discharging switch 16a is turned off and the grounding switch 15b is turned on.
- the operation of the power converter 11 may be stopped, or the supply of DC power from the DC power supply 2 to the power converter 11 may be stopped.
- the control device 18 turns off the switches 12a, 13a, and 17a, and disconnects the DC power supply 2 and the power system 3 from the power converter 11.
- the control device 18 turns on the discharge switch 16a and turns off the grounding switch 15b.
- the charges accumulated in the capacitor 14 are discharged by the first grounding resistor 15a provided on the grounding line 15. That is, by using the first grounding resistor 15a also as a discharge resistor, the residual charge in the capacitor 14 can be reliably discharged. Therefore, the discharge resistor Rd conventionally provided between the positive DC line 12 and the negative DC line 13 can be omitted.
- a relatively high DC voltage is not always applied to the first grounding resistor 15a, so the capacity of the first grounding resistor 15a may be smaller than that of the discharge resistor Rd. .
- FIG. 2 is a diagram for explaining a configuration example of the power conversion system 10 according to the second embodiment.
- Power conversion system 10 differs from power conversion system 1 of Embodiment 1 in that a second grounding resistor 15c is further provided on grounding line 15. This difference will be mainly explained below.
- the second grounding resistor 15c is provided between the first grounding resistor 15a and the grounding switch 15b.
- a discharge line 16 is connected between the first grounding resistor 15a and the second grounding resistor 15c.
- the second ground resistor 15c is provided on the ground line 15 closer to the ground potential Gp than the connection point Pc with the discharge line 16.
- the capacity of the second grounding resistor 15c can be set to be the same as or less than the capacity of the first grounding resistor 15a, and can be set to 200W, for example.
- the second grounding resistor 15c can be composed of a plurality of resistors. Furthermore, since the grounding resistor is composed of two grounding resistors 15a and 15c, the capacity of the first grounding resistor 15a may be set to, for example, 300 W, which is smaller than that in the first embodiment.
- the grounding switch 15b when discharging the residual charge in the capacitor 14, the grounding switch 15b is turned OFF. This allows discharge in a state where the negative DC line 13 is grounded via the second grounding resistor 15c. Therefore, even if there is a ground fault in the negative DC line 13, a short circuit will not occur, so safety during discharge can be improved.
- the present invention is not limited to the above embodiments, and can be implemented with various modifications without departing from the spirit of the present invention.
- a power conversion system that converts DC power to AC power has been described as an example, but the present invention can also be applied to a power conversion system that converts DC power to DC power.
- the mentioned number when referring to the number, amount, amount, range, etc. of each element in the above embodiments, unless it is specifically specified or the number is clearly specified in principle, the mentioned number This invention is not limited to.
- the structures described in the above embodiments are not necessarily essential to the present invention, unless explicitly stated or clearly specified in principle.
- SYMBOLS 1 Power conversion system, 2... DC power supply, 3... Power system, 11... Power converter, 12... Positive electrode DC line, 12a... First disconnection switch, 13... Negative electrode DC line, 13a... First disconnection Switch, 14... Capacitor, 15... Grounding line, 15a... First grounding resistor, 15c... Second grounding resistor, 16... Discharge line, 16a... Discharge switch, 17... Output line, 17a... Second Disconnection switch, 18...control device, Gp...ground potential, Pc...connection point
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
Description
図1は、実施の形態1による電力変換システム1の構成例を説明するための図である。なお、図1において破線で示す放電抵抗器Rdは、従来の電力変換システムに設けられていたものであり、本実施の形態の電力変換システム1には設けられていない。
図2は、実施の形態2による電力変換システム10の構成例を説明するための図である。電力変換システム10は、接地ライン15に第2の接地抵抗器15cを更に設ける点で、実施の形態1の電力変換システム1と相違する。以下、この相違点を中心に説明する。
Claims (3)
- 直流電源から入力される直流電力を交流電力または直流電力に変換する電力変換器と、
前記電力変換器の入力端子に接続される正極直流ラインと負極直流ラインとの間に設けられるコンデンサと、
前記負極直流ラインと接地電位とを接続し、第1の接地抵抗器が設けられる接地ラインと、
前記正極直流ラインと前記第1の接地抵抗器の前記接地電位側の前記接地ラインとを接続する放電ラインと、
前記放電ラインに設けられ、前記コンデンサの残留電荷を放電するときにONにされる放電スイッチと、を備える電力変換システム。 - 前記放電ラインとの接続点よりも前記接地電位側の前記接地ラインに第2の接地抵抗器が設けられる請求項1に記載の電力変換システム。
- 前記正極直流ライン及び前記負極直流ラインに夫々設けられる、前記電力変換器から前記直流電源を切り離すときにOFFにされる第1の切り離しスイッチと、
前記電力変換器から電力系統への出力ラインに設けられる、前記電力変換器から前記電力系統を切り離すときにOFFにされる第2の切り離しスイッチと、
前記放電スイッチ、前記第1の切り離しスイッチ及び前記第2の切り離しスイッチのONまたはOFFを制御する制御装置と、を備え、
前記制御装置は、前記第1の切り離しスイッチ及び前記第2の切り離しスイッチをOFFにした後に、前記放電スイッチをONにするように構成される請求項1または請求項2に記載の電力変換システム。
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2023555841A JP7552930B2 (ja) | 2022-09-01 | 2022-09-01 | 電力変換システム |
| US18/689,945 US20240429834A1 (en) | 2022-09-01 | 2022-09-01 | Power conversion system |
| PCT/JP2022/032946 WO2024047841A1 (ja) | 2022-09-01 | 2022-09-01 | 電力変換システム |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2022/032946 WO2024047841A1 (ja) | 2022-09-01 | 2022-09-01 | 電力変換システム |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024047841A1 true WO2024047841A1 (ja) | 2024-03-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2022/032946 Ceased WO2024047841A1 (ja) | 2022-09-01 | 2022-09-01 | 電力変換システム |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20240429834A1 (ja) |
| JP (1) | JP7552930B2 (ja) |
| WO (1) | WO2024047841A1 (ja) |
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| JP7489293B2 (ja) * | 2020-11-02 | 2024-05-23 | オークマ株式会社 | モータ絶縁検査機能付きインバータ装置 |
| JP7323066B2 (ja) * | 2020-11-13 | 2023-08-08 | 東芝三菱電機産業システム株式会社 | 電力変換器の制御装置 |
| JP7509724B2 (ja) * | 2021-07-28 | 2024-07-02 | 矢崎総業株式会社 | 車載電源供給システム |
| CN217427758U (zh) * | 2022-03-24 | 2022-09-13 | 山特电子(深圳)有限公司 | 不间断电源 |
| US12207367B2 (en) * | 2022-04-20 | 2025-01-21 | Maxim Integrated Products, Inc. | Systems and methods for improving transient response in H-bridge buck-boost drivers using integrated matrix manager |
-
2022
- 2022-09-01 JP JP2023555841A patent/JP7552930B2/ja active Active
- 2022-09-01 US US18/689,945 patent/US20240429834A1/en active Pending
- 2022-09-01 WO PCT/JP2022/032946 patent/WO2024047841A1/ja not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015100241A (ja) * | 2013-11-20 | 2015-05-28 | 株式会社デンソー | 車載電気システム |
| JP2017001425A (ja) * | 2015-06-05 | 2017-01-05 | トヨタ自動車株式会社 | 電源システム |
| JP2017060261A (ja) * | 2015-09-15 | 2017-03-23 | アイシン・エィ・ダブリュ株式会社 | インバータ制御基板 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7552930B2 (ja) | 2024-09-18 |
| JPWO2024047841A1 (ja) | 2024-03-07 |
| US20240429834A1 (en) | 2024-12-26 |
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