WO2022162948A1 - 電力変換装置 - Google Patents
電力変換装置 Download PDFInfo
- Publication number
- WO2022162948A1 WO2022162948A1 PCT/JP2021/003587 JP2021003587W WO2022162948A1 WO 2022162948 A1 WO2022162948 A1 WO 2022162948A1 JP 2021003587 W JP2021003587 W JP 2021003587W WO 2022162948 A1 WO2022162948 A1 WO 2022162948A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- inverter
- power
- negative
- control unit
- islanding
- Prior art date
Links
- 238000006243 chemical reaction Methods 0.000 title abstract description 9
- 238000000034 method Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000002620 method output Methods 0.000 description 1
Images
Classifications
-
- 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
- H02M1/36—Means for starting or stopping converters
-
- 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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
-
- 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
-
- 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
-
- 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
- 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
Definitions
- the present invention relates to a power converter.
- a power conversion device (PCS: Power Conditioning Subsystem, etc.) equipped with an inverter that converts DC power supplied from a DC power supply such as a solar battery into AC power based on a PWM (Pulse Width Modulation) signal is known.
- PCS Power Conditioning Subsystem, etc.
- PWM Pulse Width Modulation
- the inverter output power (active power/reactive power) and the load power match perfectly when the circuit breaker on the grid side is opened, the inverter operates at a power factor of 100%.
- the current supplied from the inverter to the load is maintained at the current before islanding occurs, and the terminal voltage and frequency may not change. Therefore, the power converter may continue the islanding operation without being able to detect that it is in the islanding operation.
- Power converters have problems such as the possibility of electric shock to the human body, mechanical failure, or overcurrent when reclosing when the islanding operation continues. In order to prevent the power converter from continuing the islanding operation, it is necessary to detect that the power converter is in the islanding operation.
- a method for detecting that the power converter is in islanding operation is, for example, the slip mode frequency shift method (SMFS).
- the slip mode frequency shift method is a method for detecting that the power converter is in islanding operation by detecting a frequency abnormality using reactive power (see, for example, Non-Patent Document 1).
- the present invention has been made to solve the above problems, and an object thereof is to provide a power converter capable of stopping the inverter early in the event of islanding.
- a power converter determines whether or not an inverter that converts DC power supplied from a DC power supply into AC power and a negative-phase voltage on the AC side of the inverter are equal to or greater than a predetermined value. and a stop control unit that controls to stop the inverter when the decision unit determines that the negative-sequence voltage is equal to or higher than a predetermined value.
- the stop control unit controls to stop the inverter when the positive-sequence voltage on the AC side of the inverter is within a predetermined range.
- the inverter can be stopped early in the event of islanding.
- FIG. 4 is a graph showing the relationship between a negative-sequence voltage and a q-axis negative-sequence current command; (a) is a graph showing changes in the d-axis positive sequence current and the q-axis positive sequence current. (b) is a graph showing changes in positive-sequence voltage and negative-sequence voltage. (c) is a graph showing how the reversed-phase current changes. It is a graph which illustrates the time which it took until the power converter device concerning one embodiment stopped an inverter.
- (a) is a graph illustrating frequency variation in a slip mode frequency shifting scheme
- (b) is a graph illustrating the relationship between the d-axis positive-sequence current and the q-axis positive-sequence current in the slip mode frequency shift method.
- (c) is a graph illustrating the time until a gate block signal that stops the inverter is output in the slip mode frequency shifting scheme;
- FIG. 6 is a graph illustrating the results of stopping the islanding of the power converter by the slip mode frequency shift scheme.
- FIG. 6(a) is a graph illustrating frequency changes in a slip mode frequency shifting scheme.
- FIG. 6B is a graph illustrating the relationship between the d-axis positive sequence current and the q-axis positive sequence current in the slip mode frequency shift method.
- FIG. 6(c) is a graph illustrating the time until the gate block signal that stops the inverter is output in the slip mode frequency shift scheme.
- the inverter is stopped when the frequency of the power converter adopting the slip mode frequency shift method drops from 60 Hz during normal operation to 53 Hz (UF protection level) or less.
- the q-axis positive sequence current of the power converter changes to Varies as shown. Note that the d-axis positive sequence current does not fluctuate much.
- the power converter that employs the slip mode frequency shift method outputs a gate block signal to the inverter to stop the inverter.
- a power conversion apparatus that adopts the slip mode frequency shift method takes 1.6 s from the time of islanding until the gate block signal is output, for example, as shown in FIG. 6(c).
- FIG. 1 is a diagram showing a configuration example of a power conversion device 1 and its periphery according to an embodiment.
- the power conversion device 1 is provided between a DC power supply 2 and an AC power supply (power grid) 3, and converts DC power into three-phase AC power.
- the DC power supply 2 is, for example, a solar cell module.
- the AC power supply 3 is also generally called a power system.
- a transformer 40, an RLC load 41, a circuit breaker 42, and an AC reactor 43 are connected between the power converter 1 and the AC power supply 3.
- the power converter 1 includes, for example, an inverter 10, a power controller 11, an islanding controller 12, a reverse phase output current controller 13, a current controller 14, and a PWM drive circuit 15.
- the inverter 10 is interposed between the DC power supply 2 and the AC power supply 3 and forms a series circuit together with them. Inverter 10 converts the DC power supplied from DC power supply 2 into AC power based on a PWM signal (described later). Inverter 10 may be, for example, a three-phase voltage source inverter circuit including a plurality of semiconductor switching elements.
- the power control unit 11 performs control to match the active power and reactive power with respect to a preset power standard, and outputs the controlled active power and reactive power to the current control unit 14 .
- the islanding control unit 12 When the islanding control unit 12 receives the negative-sequence voltage ( vo_n ) and the positive-sequence voltage ( vo_p ) from the output of the inverter 10, the q-axis negative-sequence current command ( ioq_n_ref ) is applied to the negative-sequence output current control. 13 and outputs the gate block signal to the PWM drive circuit 15 .
- the islanding control unit 12 receives the negative-sequence voltage ( vo_n ) and the positive-sequence voltage ( vo_p ) from the output of the inverter 10.
- the q-axis negative-sequence current command ioq_n_ref
- the negative-phase output current control unit 13 controls the q-axis negative-phase current and outputs it to the current control unit 14 .
- the current control unit 14 When the current control unit 14 receives the controlled active power and reactive power from the power control unit 11 and the q-axis negative-phase current from the negative-phase output current control unit 13 , the current control unit 14 issues a current command to the PWM drive circuit 15 . print the value.
- the PWM driving circuit 15 generates a pulse width modulation signal (PWM signal) according to the current command value of the current control section 14. Then, PWM drive circuit 15 transmits this PWM signal to inverter 10 as a drive signal (gate signal) for the semiconductor switching element.
- PWM signal pulse width modulation signal
- FIG. 2 is a block diagram showing a specific configuration example of the islanding control unit 12. As shown in FIG. As shown in FIG. 2, the islanding control unit 12 includes a current command unit 5, a measurement unit 6, a determination unit 7, and a stop control unit 8, for example.
- the current command unit 5 When receiving the negative-phase voltage ( vo_n ), the current command unit 5 calculates a q-axis negative-phase current command ( ioq_n_ref ) and outputs it to the negative-phase output current control unit 13 . For example, the current command unit 5 outputs a q-axis negative-sequence current command ( ioq_n_ref ) according to the negative-sequence voltage ( vo_n ), as shown in FIG.
- the measurement unit 6 ( FIG. 2 ) measures the input negative-phase voltage ( vo_n ) and outputs the measurement result to the determination unit 7 .
- FIG. 4 is a graph showing an example of an operation state when the measuring unit 6 measures the negative-sequence voltage ( vo_n ) in islanding operation.
- FIG. 4A is a graph showing changes in the d-axis positive sequence current and the q-axis positive sequence current.
- FIG. 4(b) is a graph showing changes in the positive-sequence voltage ( vo_p ) and the negative-sequence voltage ( vo_n ).
- FIG.4(c) is a graph which shows the change condition of a negative sequence current.
- the d-axis positive sequence current and the q-axis positive sequence current do not change much even in islanding.
- the positive phase voltage does not change much, but the negative phase voltage changes.
- the negative sequence current increases in islanding operation.
- the inverter 10 injects the negative-sequence current, and the negative-sequence voltage further rises.
- the negative-sequence current increases, the negative-sequence voltage also increases, and the increase in the negative-sequence voltage further increases the negative-sequence current.
- the determination unit 7 determines whether or not the negative-phase voltage ( vo_n ) measured by the measurement unit 6 is equal to or greater than a predetermined determination value, and outputs the determination result to the stop control unit 8 . That is, the determination unit 7 determines whether or not the negative-sequence voltage on the AC side of the inverter 10 is equal to or higher than a predetermined value.
- the stop control unit 8 includes a condition determination unit 80, an AND circuit 82, and a delay element 84, and controls the PWM drive circuit 15. For example, the stop control unit 8 controls to stop the inverter 10 when the determination unit 7 determines that the negative-sequence voltage is equal to or higher than a predetermined value.
- condition determination unit 80 determines whether or not the input positive-sequence voltage ( vo_p ) satisfies, for example, 0.9 ⁇ vo_p ⁇ 1.1 , and outputs the determination result to the AND circuit 82. Output for In other words, the condition determination unit 80 determines whether or not the positive-sequence voltage is within the normal range, not the unbalanced operating state (unbalanced short circuit).
- the stop control unit 8 controls to stop the inverter 10 when the positive phase voltage on the AC side of the inverter 10 is within a predetermined range.
- the determining unit 7 determines that the negative-sequence voltage is equal to or greater than a predetermined value, and the condition determining unit 80 determines that the positive-sequence voltage ( vo_p ) is, for example, 0.9 ⁇ vo_p ⁇ 1.1 . If determined, it outputs a gate block signal to the PWM drive circuit 15 .
- the delay element 84 is an element that imparts a delay in order to stabilize the control operation, and imparts a delay of several ms, for example.
- the power converter 1 injects a negative-sequence current based on the positive-sequence voltage ( vo_p ) and the negative-sequence voltage ( vo_n ) to increase the negative-sequence voltage, Inverter 10 can be stopped at high speed.
- FIG. 5 is a graph illustrating the time taken by the power conversion device 1 according to one embodiment to stop the inverter 10.
- the islanding control unit 12 can output the gate block signal to the PWM driving circuit 15 within 50 ms after the islanding operation.
- the power converter 1 includes the islanding control unit 12 that controls to stop the inverter 10 when the determination unit 7 determines that the negative-sequence voltage is equal to or higher than a predetermined value. Therefore, when islanding occurs, the inverter can be stopped early.
- each function of the control performed by the power conversion device 1 may be configured partially or entirely by hardware such as a PLD (Programmable Logic Device) or an FPGA (Field Programmable Gate Array), or a processor such as a CPU. may be configured as a program executed by
- control performed by the power converter 1 according to the present invention can be realized using a computer and a program, and the program can be recorded on a storage medium or provided through a network.
- SYMBOLS 1... Power converter, 2... DC power supply, 3... AC power supply, 5... Current command part, 6... Measurement part, 7... Judgment part, 8... Stop control Part, 10... Inverter, 11... Power control part, 12... Individual operation control part, 13... Negative phase output current control part, 14... Current control part, 15... PWM drive Circuit 40 Transformer 41 RLC load 42 Circuit breaker 43 AC reactor 80 Condition determination unit 82 AND circuit 84 Delay element
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
Description
Claims (2)
- 直流電源から供給される直流電力を交流電力に変換するインバータと、
前記インバータの交流側における逆相電圧が所定値以上であるか否かを判定する判定部と、
逆相電圧が所定値以上であると前記判定部が判定した場合に、前記インバータを停止させるように制御する停止制御部と
を有することを特徴とする電力変換装置。 - 前記停止制御部は、
前記インバータの交流側における正相電圧が所定の範囲内である場合に、前記インバータを停止させるように制御すること
を特徴とする請求項1に記載の電力変換装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021569176A JP7151911B1 (ja) | 2021-02-01 | 2021-02-01 | 電力変換装置 |
PCT/JP2021/003587 WO2022162948A1 (ja) | 2021-02-01 | 2021-02-01 | 電力変換装置 |
CN202180015201.7A CN115250644A (zh) | 2021-02-01 | 2021-02-01 | 电力转换装置 |
US17/760,330 US20230071413A1 (en) | 2021-02-01 | 2021-02-01 | Power conversion device |
EP21922958.0A EP4287488A1 (en) | 2021-02-01 | 2021-02-01 | Power conversion device |
Applications Claiming Priority (1)
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PCT/JP2021/003587 WO2022162948A1 (ja) | 2021-02-01 | 2021-02-01 | 電力変換装置 |
Publications (1)
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WO2022162948A1 true WO2022162948A1 (ja) | 2022-08-04 |
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PCT/JP2021/003587 WO2022162948A1 (ja) | 2021-02-01 | 2021-02-01 | 電力変換装置 |
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US (1) | US20230071413A1 (ja) |
EP (1) | EP4287488A1 (ja) |
JP (1) | JP7151911B1 (ja) |
CN (1) | CN115250644A (ja) |
WO (1) | WO2022162948A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60141123A (ja) * | 1983-12-28 | 1985-07-26 | 関西電力株式会社 | 太陽光発電装置 |
JP2013116019A (ja) * | 2011-12-01 | 2013-06-10 | Daihen Corp | 単独運転検出装置、系統連系インバータシステム、および、単独運転検出方法 |
JP2015180174A (ja) * | 2014-02-26 | 2015-10-08 | 日新電機株式会社 | 分散電源の単独運転検出装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5345764B2 (ja) * | 2007-05-22 | 2013-11-20 | ルネサスエレクトロニクス株式会社 | モータ制御用マイクロコンピュータ及びその制御方法 |
JP6389425B2 (ja) * | 2014-11-28 | 2018-09-12 | ミネベアミツミ株式会社 | モータ駆動制御装置および回転状態検出方法 |
-
2021
- 2021-02-01 US US17/760,330 patent/US20230071413A1/en active Pending
- 2021-02-01 WO PCT/JP2021/003587 patent/WO2022162948A1/ja active Application Filing
- 2021-02-01 CN CN202180015201.7A patent/CN115250644A/zh active Pending
- 2021-02-01 EP EP21922958.0A patent/EP4287488A1/en active Pending
- 2021-02-01 JP JP2021569176A patent/JP7151911B1/ja active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60141123A (ja) * | 1983-12-28 | 1985-07-26 | 関西電力株式会社 | 太陽光発電装置 |
JP2013116019A (ja) * | 2011-12-01 | 2013-06-10 | Daihen Corp | 単独運転検出装置、系統連系インバータシステム、および、単独運転検出方法 |
JP2015180174A (ja) * | 2014-02-26 | 2015-10-08 | 日新電機株式会社 | 分散電源の単独運転検出装置 |
Non-Patent Citations (1)
Title |
---|
CHIHIRO OKADO: "A Novel Islanding Protection System for Photovoltaic Inverters", T. IEE JAPAN, vol. 114, pages 732 - 738 |
Also Published As
Publication number | Publication date |
---|---|
EP4287488A1 (en) | 2023-12-06 |
CN115250644A (zh) | 2022-10-28 |
JPWO2022162948A1 (ja) | 2022-08-04 |
JP7151911B1 (ja) | 2022-10-12 |
US20230071413A1 (en) | 2023-03-09 |
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