WO2023281643A1 - 電力変換装置、及びスイッチング素子の故障診断方法 - Google Patents

電力変換装置、及びスイッチング素子の故障診断方法 Download PDF

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Publication number
WO2023281643A1
WO2023281643A1 PCT/JP2021/025558 JP2021025558W WO2023281643A1 WO 2023281643 A1 WO2023281643 A1 WO 2023281643A1 JP 2021025558 W JP2021025558 W JP 2021025558W WO 2023281643 A1 WO2023281643 A1 WO 2023281643A1
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WIPO (PCT)
Prior art keywords
voltage
switching element
neutral point
test pulse
negative electrode
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Ceased
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PCT/JP2021/025558
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English (en)
French (fr)
Japanese (ja)
Inventor
光貴 森崎
海青 李
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Toshiba Mitsubishi Electric Industrial Systems Corp
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Toshiba Mitsubishi Electric Industrial Systems Corp
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Priority to US18/005,491 priority Critical patent/US12301130B2/en
Priority to CN202180061281.XA priority patent/CN116325473A/zh
Priority to JP2023532935A priority patent/JP7626328B2/ja
Priority to PCT/JP2021/025558 priority patent/WO2023281643A1/ja
Publication of WO2023281643A1 publication Critical patent/WO2023281643A1/ja
Anticipated expiration legal-status Critical
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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
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters
    • 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 and a failure diagnosis method for switching elements.
  • a power conversion device that performs power conversion to supply DC power output by a DC power supply device such as a photovoltaic (PV) device to an AC power supply system, for example, uses multiple switching elements such as IGBTs (Insulated Gate Bipolar Transistors). I have.
  • Patent Literature 1 discloses an example of a power conversion device capable of diagnosing failures of switching elements.
  • An object of the present invention is to provide a power conversion device that can diagnose the presence or absence of a short-circuit fault in a switching element even while it is connected to a DC power supply device, and a failure diagnosis method for the switching element.
  • a power conversion device is a power conversion device including a three-level TNPP circuit, in which voltage between a DC positive electrode and a DC neutral point, voltage between a DC neutral point and a DC negative electrode, and a voltage detection unit for detecting the voltage between the DC positive electrode and the DC negative electrode; a test pulse output section for outputting a test pulse to the inner switching element connected in the forward direction; and an inner switching section in which the test pulse output section is connected in the forward direction from the DC neutral point toward the AC output end.
  • a test pulse is output to the element, if the voltage between the DC neutral point and the DC negative electrode detected by the voltage detection unit drops, the outer switching element connected to the DC negative electrode is short-circuited. It is characterized by having a judgment unit for judging.
  • a power conversion device is a power conversion device including a 3-level TNPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the voltage between the DC neutral point and the DC negative electrode, A voltage detection unit that detects a voltage and a voltage between the DC positive electrode and the DC negative electrode, and an AC output from the DC neutral point when each of the voltages detected by the voltage detection unit rises and exceeds a predetermined threshold.
  • a test pulse output section for outputting a test pulse to the inner switching element connected in the opposite direction toward the end, and the test pulse output section is connected in the opposite direction from the DC neutral point toward the AC output end.
  • a power conversion device is a power conversion device including a 3-level TNPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the voltage between the DC neutral point and the DC negative electrode, a voltage detection unit that detects a voltage and a voltage between the DC positive electrode and the DC negative electrode; and an outside connected to the DC positive electrode when each of the voltages detected by the voltage detection unit rises and exceeds a predetermined threshold.
  • a test pulse output section that outputs a test pulse to a switching element, and a direct current detected by the voltage detection section when the test pulse output section outputs the test pulse to the outer switching element connected to the positive DC terminal.
  • a judgment unit for judging that the inner switching element connected in the opposite direction from the DC neutral point toward the AC output end has a short-circuit failure when the voltage between the positive electrode and the DC neutral point drops. characterized by
  • a power conversion device is a power conversion device including a 3-level TNPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the voltage between the DC neutral point and the DC negative electrode, a voltage detection unit that detects a voltage and a voltage between the DC positive electrode and the DC negative electrode; and an outside connected to the DC positive electrode when each of the voltages detected by the voltage detection unit rises and exceeds a predetermined threshold.
  • a test pulse output section that outputs a test pulse to a switching element, and a direct current detected by the voltage detection section when the test pulse output section outputs the test pulse to the outer switching element connected to the positive DC terminal.
  • a determination unit that determines that the outer switching element connected to the DC negative electrode has a short-circuit failure when the voltage between the positive electrode and the DC negative electrode drops.
  • a power conversion device is a power conversion device including a 3-level TNPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the voltage between the DC neutral point and the DC negative electrode, a voltage detection unit that detects a voltage and a voltage between the DC positive electrode and the DC negative electrode; and an outer connected to the DC negative electrode when each of the voltages detected by the voltage detection unit rises and exceeds a predetermined threshold.
  • a test pulse output section that outputs a test pulse to a switching element, and a direct current detected by the voltage detection section when the test pulse output section outputs the test pulse to the outer switching element connected to the DC negative pole.
  • a determination unit that determines that the outer switching element connected to the DC positive electrode has a short-circuit failure when the voltage between the positive electrode and the DC negative electrode drops.
  • a power conversion device is a power conversion device including a 3-level TNPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the voltage between the DC neutral point and the DC negative electrode, a voltage detection unit that detects a voltage and a voltage between the DC positive electrode and the DC negative electrode; and an outer connected to the DC negative electrode when each of the voltages detected by the voltage detection unit rises and exceeds a predetermined threshold.
  • a test pulse output section that outputs a test pulse to a switching element, and a direct current detected by the voltage detection section when the test pulse output section outputs the test pulse to the outer switching element connected to the DC negative pole.
  • a judgment unit for judging that the inner switching element connected in the forward direction from the DC neutral point toward the AC output end has a short-circuit failure when the voltage between the neutral point and the DC negative electrode drops. characterized by
  • a power conversion device is a power conversion device including a three-level NPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the voltage between the DC neutral point and the DC negative electrode, a voltage detection unit that detects a voltage and a voltage between the DC positive electrode and the DC negative electrode; and an outside connected to the DC positive electrode when each of the voltages detected by the voltage detection unit rises and exceeds a predetermined threshold.
  • a test pulse output section that outputs a test pulse to the switching element and the inner switching element on the DC positive side, and the test pulse output section is connected to the DC positive side to the outer switching element and the inner switching element on the DC positive side.
  • a determining unit that determines that the inner switching element on the DC negative electrode side has a short-circuit failure when the voltage between the DC positive electrode and the DC neutral point detected by the voltage detecting unit decreases when the test pulse is output; characterized by having
  • a power conversion device is a power conversion device including a three-level NPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the voltage between the DC neutral point and the DC negative electrode, a voltage detection unit for detecting a voltage and a voltage between the DC positive electrode and the DC negative electrode; and an inner switching element on the DC positive electrode side when each of the voltages detected by the voltage detection unit rises and exceeds a predetermined threshold. and a test pulse output unit for outputting a test pulse to the inner switching element on the DC negative side, and the test pulse output unit outputting the test pulse to the inner switching element on the DC positive side and the inner switching element on the DC negative side.
  • a determination unit that determines that an outer switching element connected to the DC positive electrode is short-circuited when the voltage between the DC positive electrode and the DC neutral point detected by the voltage detection unit drops in the case where It is characterized by
  • a power conversion device is a power conversion device including a three-level NPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the voltage between the DC neutral point and the DC negative electrode, a voltage detection unit for detecting a voltage and a voltage between the DC positive electrode and the DC negative electrode; and an inner switching element on the DC positive electrode side when each of the voltages detected by the voltage detection unit rises and exceeds a predetermined threshold. and a test pulse output unit for outputting a test pulse to the inner switching element on the DC negative side, and the test pulse output unit outputting the test pulse to the inner switching element on the DC positive side and the inner switching element on the DC negative side.
  • a judgment unit for judging that an outer switching element connected to the DC negative electrode has a short-circuit failure when the voltage between the DC neutral point and the DC negative electrode detected by the voltage detection unit drops in the case where the It is characterized by
  • a power conversion device is a power conversion device including a three-level NPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the voltage between the DC neutral point and the DC negative electrode, a voltage detection unit for detecting a voltage and a voltage between the DC positive electrode and the DC negative electrode; and an inner switching element on the DC negative electrode side when each of the voltages detected by the voltage detection unit rises and exceeds a predetermined threshold. and a test pulse output section that outputs a test pulse to the outer switching element connected to the DC negative pole, and the test pulse output section outputs the test pulse output section to the inner switching element on the DC negative pole side and the outer switching element connected to the DC negative pole.
  • a determination unit that determines that the inner switching element on the DC positive electrode side has a short-circuit failure when the voltage between the DC neutral point and the DC negative electrode detected by the voltage detection unit drops when the test pulse is output; characterized by having
  • a power conversion device is a power conversion device including a two-level switching circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the voltage between the DC neutral point and the DC negative electrode, a voltage detection unit for detecting a voltage and a voltage between the DC positive electrode and the DC negative electrode; and a switching device connected to the DC positive electrode when each of the voltages detected by the voltage detection unit rises and exceeds a predetermined threshold.
  • a test pulse output section that outputs a test pulse to an element; and a DC positive electrode that is detected by the voltage detection section when the test pulse output section outputs a test pulse to a switching element connected to the DC positive electrode.
  • a determination unit that determines that a switching element connected to the DC negative electrode has a short-circuit failure when the voltage between the DC neutral point and the voltage between the DC neutral point and the DC negative electrode decreases.
  • a power conversion device is a power conversion device including a two-level switching circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the voltage between the DC neutral point and the DC negative electrode, a voltage detection unit for detecting a voltage and a voltage between the DC positive electrode and the DC negative electrode; and a switching device connected to the DC negative electrode when each of the voltages detected by the voltage detection unit increases and exceeds a predetermined threshold.
  • a test pulse output section that outputs a test pulse to an element; and a DC positive electrode that is detected by the voltage detection section when the test pulse output section outputs the test pulse to a switching element connected to the DC negative electrode.
  • a determination unit that determines that a switching element connected to the DC positive electrode has a short-circuit failure when the voltage between the DC neutral point and the voltage between the DC neutral point and the DC negative electrode decreases.
  • a failure diagnosis method for a switching element is a failure diagnosis method for a switching element provided in a three-level TNPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the DC neutral point and the DC A voltage detection step of detecting the voltage between the negative electrode and the voltage between the DC positive electrode and the DC negative electrode, and when each of the detected voltages rises and exceeds a predetermined threshold, AC output from the DC neutral point A test pulse outputting step of outputting a test pulse to the inner switching element forwardly connected toward the end, and a test pulse outputting step to the inner switching element forwardly connected from the DC neutral point toward the AC output end. and a determination step of determining that the outer switching element connected to the DC negative electrode has a short-circuit failure when the voltage between the DC neutral point and the DC negative electrode decreases when the test pulse is output. and
  • a failure diagnosis method for a switching element is a failure diagnosis method for a switching element provided in a three-level TNPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the DC neutral point and the DC A voltage detection step of detecting the voltage between the negative electrode and the voltage between the DC positive electrode and the DC negative electrode, and when each of the detected voltages rises and exceeds a predetermined threshold, AC output from the DC neutral point A test pulse output step of outputting a test pulse to the inner switching element connected in the opposite direction toward the end, and to the inner switching element connected in the opposite direction from the DC neutral point to the AC output end. and a determination step of determining that an outer switching element connected to the DC positive electrode is short-circuited when the voltage between the DC positive electrode and the DC neutral point drops when the test pulse is output. and
  • a failure diagnosis method for a switching element is a failure diagnosis method for a switching element provided in a three-level TNPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the DC neutral point and the DC a voltage detection step of detecting the voltage between the negative electrode and the voltage between the DC positive electrode and the DC negative electrode; The voltage between the DC positive electrode and the DC neutral point drops in the test pulse output step of outputting the test pulse to the switching element and when the test pulse is output to the outer switching element connected to the DC positive electrode. Then, the step of determining that the inner switching element connected in the opposite direction from the DC neutral point toward the AC output terminal has a short-circuit failure.
  • a failure diagnosis method for a switching element is a failure diagnosis method for a switching element provided in a three-level TNPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the DC neutral point and the DC a voltage detection step of detecting the voltage between the negative electrode and the voltage between the DC positive electrode and the DC negative electrode; In the test pulse output step of outputting a test pulse to the switching element, and when the test pulse is output to the outer switching element connected to the DC positive electrode, when the voltage between the DC positive electrode and the DC negative electrode decreases, and a determination step of determining that the outer switching element connected to the DC negative electrode has a short-circuit failure.
  • a failure diagnosis method for a switching element is a failure diagnosis method for a switching element provided in a three-level TNPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the DC neutral point and the DC a voltage detection step of detecting the voltage between the negative electrode and the voltage between the DC positive electrode and the DC negative electrode; In the test pulse output step of outputting a test pulse to the switching element, and when the test pulse is output to the outer switching element connected to the DC negative electrode, when the voltage between the DC positive electrode and the DC negative electrode decreases, and a determination step of determining that the outer switching element connected to the DC positive electrode has a short-circuit failure.
  • a failure diagnosis method for a switching element is a failure diagnosis method for a switching element provided in a three-level TNPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the DC neutral point and the DC a voltage detection step of detecting the voltage between the negative electrode and the voltage between the DC positive electrode and the DC negative electrode; The voltage between the DC neutral point and the DC negative electrode drops in the test pulse output step of outputting the test pulse to the switching element and when the test pulse is output to the outer switching element connected to the DC negative electrode. Then, the step of determining that the inner switching element connected in the forward direction from the DC neutral point toward the AC output terminal has a short-circuit failure.
  • a failure diagnosis method for a switching element is a failure diagnosis method for a switching element provided in a 3-level NPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the DC neutral point and the DC a voltage detection step of detecting the voltage between the negative electrode and the voltage between the DC positive electrode and the DC negative electrode; A test pulse output step of outputting a test pulse to the switching element and the inner switching element on the DC positive side, and outputting the test pulse to the outer switching element connected to the DC positive side and the inner switching element on the DC positive side. and a determination step of determining that the inner switching element on the DC negative electrode side has a short-circuit failure when the voltage between the DC positive electrode and the DC neutral point drops.
  • a fault diagnosis method for a switching element is a fault diagnosis method for a switching element provided in a three-level NPP circuit, wherein A voltage detection step of detecting the voltage between the DC positive electrode and the DC negative electrode and the voltage between the DC positive electrode and the DC negative electrode, and when each of the detected voltages rises and exceeds a predetermined threshold, the inner switching element on the DC positive electrode side and the DC a test pulse output step of outputting a test pulse to the inner switching element on the negative electrode side; and a determination step of determining that the outer switching element connected to the DC positive electrode has a short-circuit failure when the voltage between the neutral point drops.
  • a failure diagnosis method for a switching element is a failure diagnosis method for a switching element provided in a 3-level NPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the DC neutral point and the DC a voltage detection step of detecting the voltage between the negative electrode and the voltage between the DC positive electrode and the DC negative electrode; and a test pulse output step of outputting a test pulse to the inner switching element on the DC negative side and outputting the test pulse to the inner switching element on the DC positive side and the inner switching element on the DC negative side. and a determination step of determining that the outer switching element connected to the DC negative electrode has a short-circuit failure when the voltage between the polarity point and the DC negative electrode decreases.
  • a failure diagnosis method for a switching element is a failure diagnosis method for a switching element provided in a 3-level NPP circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the DC neutral point and the DC a voltage detection step of detecting the voltage between the negative electrode and the voltage between the DC positive electrode and the DC negative electrode; and a test pulse output step of outputting a test pulse to the outer switching element connected to the DC negative electrode, and outputting the test pulse to the inner switching element on the DC negative electrode side and the outer switching element connected to the DC negative electrode. and a determination step of determining that the inner switching element on the DC positive electrode side has a short-circuit failure when the voltage between the DC neutral point and the DC negative electrode drops.
  • a switching element failure diagnosis method is a switching element failure diagnosis method provided in a two-level switching circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the DC neutral point and the DC a voltage detection step of detecting the voltage between the negative electrode and the voltage between the DC positive electrode and the DC negative electrode; and the switching connected to the DC positive electrode when each of the detected voltages increases and exceeds a predetermined threshold.
  • a switching element failure diagnosis method is a switching element failure diagnosis method provided in a two-level switching circuit, wherein the voltage between the DC positive electrode and the DC neutral point, the DC neutral point and the DC a voltage detection step of detecting the voltage between the negative electrode and the voltage between the DC positive electrode and the DC negative electrode; and the switching connected to the DC negative electrode when each of the detected voltages increases and exceeds a predetermined threshold.
  • the present invention it is possible to diagnose the presence or absence of a short-circuit fault in the switching element even while it is still connected to the DC power supply.
  • FIG. 3 is a diagram showing a TNPP circuit for one phase included in a 3-level TNPP circuit
  • FIG. 4 is a diagram showing the relationship between output destinations of test pulses and short-circuit fault elements in fault diagnosis performed by the power electronics device
  • FIG. 4 is a diagram showing one phase NPP circuit included in a 3-level NPP circuit
  • FIG. 4 is a diagram showing the relationship between output destinations of test pulses and short-circuit fault elements in fault diagnosis performed by the power electronics device; It is a figure which shows the structural example of the electric power system which has the power converter device concerning 3rd Embodiment.
  • FIG. 4 is a diagram showing a two-level switching circuit for one phase included in the two-level switching circuit;
  • FIG. 4 is a diagram showing the relationship between output destinations of test pulses and short-circuit fault elements in fault diagnosis performed by the power electronics device;
  • FIG. 1 is a diagram showing a configuration example of a power system 1 having a power converter according to the first embodiment.
  • the power system 1 is configured such that a power conversion device 2 converts DC power output from a photovoltaic power generation device 10 , for example, and supplies the converted power to an AC power supply system 12 .
  • the power conversion device 2 includes, for example, a three-phase three-level TNPP (Threee Level T-Typed Neutral Point Piloted) circuit 20, a filter 21, a circuit breaker 22, a circuit breaker 23, a voltmeter 24, a voltmeter 25, a voltage detection unit 26, It has an execution determination section 27 , a test pulse output section 28 and a determination section 29 .
  • TNPP Three-phase Three-level TNPP (Three Level T-Typed Neutral Point Piloted) circuit 20
  • a filter 21 for a circuit breaker 22
  • a circuit breaker 23 a circuit breaker 23, a voltmeter 24, a voltmeter 25, a voltage detection unit 26
  • It has an execution determination section 27 , a test pulse output section 28 and a determination section 29 .
  • the 3-level TNPP circuit 20 is an inverter circuit that performs power conversion using the TNPP method for each of the three phases of U-phase, V-phase, and W-phase.
  • the filter 21 is, for example, an LC filter, filters the three-phase power output from the three-level TNPP circuit 20, and outputs the filtered power to the circuit breaker .
  • the breaker 22 cuts off the DC power output by the photovoltaic power generation device 10 .
  • the breaker 23 cuts off the power output from the filter 21 .
  • the voltmeter 24 measures the voltage between the DC positive pole (P) and the DC neutral point (C) for the 3-level TNPP circuit 20 and outputs it to the voltage detection section 26 .
  • the voltmeter 25 measures the voltage between the DC neutral point (C) and the DC negative electrode (N) for the 3-level TNPP circuit 20 and outputs it to the voltage detection section 26 .
  • the voltage detection unit 26 Based on the voltage measured by the voltmeter 24 and the voltage measured by the voltmeter 25, the voltage detection unit 26 detects the voltage between the DC positive electrode and the DC neutral point and the voltage between the DC neutral point and the DC negative electrode. The voltage and the voltage between the DC positive electrode and the DC negative electrode are detected, and the detection result is output to the execution determination section 27 and the determination section 29 .
  • the execution determination unit 27 determines that the power conversion device 2 executes self-diagnosis for failure of the switching element when each of the voltages detected by the voltage detection unit 26 rises and exceeds a predetermined threshold.
  • the test pulse output unit 28 outputs a test pulse to each switching element included in the 3-level TNPP circuit 20 when the execution determination unit 27 determines to execute the self-diagnosis, as will be described later.
  • the test pulse is, for example, a one-shot pulse of several ms.
  • the determination unit 29 determines each switching element included in the 3-level TNPP circuit 20 based on at least one of the voltages detected by the voltage detection unit 26 when the test pulse output unit 28 outputs a predetermined test pulse as described later. Determine whether or not the element has a short circuit fault.
  • FIG. 2 is a diagram showing a TNPP circuit for one phase that the 3-level TNPP circuit 20 has.
  • the three-level TNPP circuit 20 has the TNPP circuit shown in FIG. 2 for each of the three phases.
  • each switching element is described as follows.
  • FIG. 3 is a diagram showing the relationship between test pulse output destinations and short-circuit failure elements (switching elements) in the failure diagnosis performed by the power conversion device 2 .
  • the test pulse output unit 28 outputs a test pulse to the inner switching element connected in the forward direction from the DC neutral point toward the AC output terminal
  • the power conversion device 2 When the voltage between the DC neutral point and the DC negative electrode detected by the voltage detection unit 26 drops, the determination unit 29 determines that the outer switching element connected to the DC negative electrode has a short-circuit failure.
  • the test pulse output unit 28 when the test pulse output unit 28 outputs a test pulse to the inner switching element connected in the opposite direction from the DC neutral point toward the AC output end, the voltage detection unit 26 When the detected voltage between the DC positive electrode and the DC neutral point drops, the determination unit 29 determines that the outer switching element connected to the DC positive electrode has a short-circuit failure.
  • the test pulse output unit 28 outputs a test pulse to the outer switching element connected to the DC positive electrode
  • the power conversion device 2 detects the difference between the DC positive electrode and the DC neutral point detected by the voltage detection unit 26.
  • the determination unit 29 determines that the inner switching element connected in the opposite direction from the DC neutral point to the AC output terminal has a short-circuit failure.
  • the test pulse output unit 28 outputs a test pulse to the outer switching element connected to the DC positive electrode
  • the power converter 2 detects the voltage between the DC positive electrode and the DC negative electrode detected by the voltage detection unit 26.
  • the determination unit 29 determines that the outer switching element connected to the DC negative electrode has a short-circuit failure.
  • the test pulse output unit 28 outputs a test pulse to the outer switching element connected to the DC negative electrode
  • the power conversion device 2 detects the voltage between the DC positive electrode and the DC negative electrode detected by the voltage detection unit 26.
  • the determination unit 29 determines that the outer switching element connected to the DC positive electrode has a short-circuit failure.
  • the power conversion device 2 detects the difference between the DC neutral point detected by the voltage detection unit 26 and the DC negative electrode.
  • the determination unit 29 determines that the inner switching element connected in the forward direction from the DC neutral point toward the AC output terminal has a short-circuit failure.
  • the power conversion device 2 preferably diagnoses Q1 and Q4 after diagnosing Q2 and Q3.
  • FIG. 4 is a diagram showing a configuration example of a power system 1a having a power converter according to the second embodiment.
  • the electric power system 1 a is configured such that the power conversion device 2 a converts the DC power output by the photovoltaic power generation device 10 , for example, and supplies the converted power to the AC power supply system 12 .
  • the same reference numerals are given to substantially the same configurations as those described above, unless otherwise stated.
  • the power conversion device 2a includes, for example, a three-phase three-level NPP (Neutral Point Piloted) circuit 20a, a filter 21, a breaker 22, a breaker 23, a voltmeter 24, a voltmeter 25, a voltage detection unit 26, an execution determination unit 27, It has a test pulse output section 28 and a determination section 29 .
  • NPP Neutral Point Piloted
  • the 3-level NPP circuit 20a is an inverter circuit that performs power conversion using the NPP method for each of the three phases of U, V, and W phases.
  • FIG. 5 is a diagram showing an NPP circuit for one phase included in the 3-level NPP circuit 20a.
  • the three-level NPP circuit 20a has the NPP circuits shown in FIG. 5 for each of the three phases.
  • each switching element is described as follows.
  • FIG. 6 is a diagram showing the relationship between test pulse output destinations and short-circuit failure elements (switching elements) in failure diagnosis performed by the power converter 2a.
  • the power conversion device 2a outputs a test pulse to the outer switching element connected to the DC positive electrode and the inner switching element on the DC positive electrode side by the test pulse output unit 28.
  • the determination unit 29 determines that the inner switching element on the DC negative electrode side has a short-circuit failure.
  • the test pulse output unit 28 outputs a test pulse to the inner switching element on the DC positive electrode side and the inner switching element on the DC negative electrode side
  • the power converter 2a detects the DC positive electrode detected by the voltage detection unit 26 and the When the voltage between the DC neutral point drops, the determination unit 29 determines that the outer switching element connected to the DC positive electrode is short-circuited.
  • the test pulse output unit 28 when the test pulse output unit 28 outputs a test pulse to the inner switching element on the DC positive side and the inner switching element on the DC negative side, the DC neutral voltage detected by the voltage detection unit 26 is detected.
  • the determination unit 29 determines that the outer switching element connected to the DC negative electrode has a short-circuit failure.
  • the power conversion device 2a detects the DC voltage detected by the voltage detection unit 26 when the test pulse output unit 28 outputs a test pulse to the inner switching element on the DC negative electrode side and the outer switching element connected to the DC negative electrode.
  • the determination unit 29 determines that the inner switching element on the DC positive electrode side has a short-circuit failure.
  • FIG. 7 is a diagram showing a configuration example of a power system 1b having a power converter according to the third embodiment.
  • the power system 1 b is configured such that the DC power output by the photovoltaic power generation device 10 is converted by the power conversion device 2 b and supplied to the AC power supply system 12 .
  • the same reference numerals are given to substantially the same configurations as those described above, unless otherwise stated.
  • the power converter 2b includes, for example, a three-phase two-level switching circuit 20b, a filter 21, a circuit breaker 22, a circuit breaker 23, a voltmeter 24, a voltmeter 25, a voltage detection unit 26, an execution determination unit 27, and a test pulse output unit 28. , and a determination unit 29 .
  • FIG. 8 is a diagram showing a two-level switching circuit for one phase included in the two-level switching circuit 20b.
  • the 2-level switching circuit 20b has the 2-level switching circuit shown in FIG. 8 for each of the three phases.
  • each switching element is described as follows.
  • FIG. 9 is a diagram showing the relationship between test pulse output destinations and short-circuit failure elements (switching elements) in failure diagnosis performed by the power converter 2b.
  • the determination unit 29 determines that the switching element connected to the DC negative electrode has a short-circuit failure.
  • the test pulse output unit 28 outputs a test pulse to the switching element connected to the DC negative electrode
  • the power conversion device 2b detects a voltage between the DC positive electrode detected by the voltage detection unit 26 and the DC neutral point. and the voltage between the DC neutral point and the DC negative electrode drop, the determination unit 29 determines that the switching element connected to the DC positive electrode has a short-circuit failure.
  • the power conversion device 2, the power conversion device 2a, and the power conversion device 2b diagnose the presence or absence of a short-circuit failure of the switching element even while being connected to a DC power supply device such as the solar power generation device 10. be able to.
  • the power conversion device 2, the power conversion device 2a, and the power conversion device 2b sequentially output a short-time test pulse to all the elements in a low voltage region such as sunrise where the main circuit voltage is being charged.
  • a short-time test pulse to all the elements in a low voltage region such as sunrise where the main circuit voltage is being charged.
  • the change aspect of the DC voltage or the aspect of the DC current from the photovoltaic power generation device 10
  • the presence or absence of a short-circuit fault in the switching element is diagnosed.
  • the power conversion device 2, the power conversion device 2a, and the power conversion device 2b are charged to a low voltage of about 50V and automatically diagnosed.
  • the power conversion device 2, the power conversion device 2a, and the power conversion device 2b can be safely diagnosed by outputting a test pulse in a low voltage region, preventing short-circuit accidents and secondary damage to other parts can be prevented.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
PCT/JP2021/025558 2021-07-07 2021-07-07 電力変換装置、及びスイッチング素子の故障診断方法 Ceased WO2023281643A1 (ja)

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US18/005,491 US12301130B2 (en) 2021-07-07 2021-07-07 Power conversion device and method of diagnosing failures of switching devices
CN202180061281.XA CN116325473A (zh) 2021-07-07 2021-07-07 电力变换装置及开关元件的故障诊断方法
JP2023532935A JP7626328B2 (ja) 2021-07-07 2021-07-07 電力変換装置、及びスイッチング素子の故障診断方法
PCT/JP2021/025558 WO2023281643A1 (ja) 2021-07-07 2021-07-07 電力変換装置、及びスイッチング素子の故障診断方法

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US12316243B2 (en) * 2020-04-30 2025-05-27 Tmeic Corporation Power converter and failure analysis method
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JP2003033045A (ja) * 2001-07-10 2003-01-31 Mitsubishi Electric Corp インバータ装置
JP2012210150A (ja) * 2012-08-02 2012-10-25 Toshiba Mitsubishi-Electric Industrial System Corp 多レベル電力変換装置
JP2013176240A (ja) * 2012-02-27 2013-09-05 Toshiba Mitsubishi-Electric Industrial System Corp 電力変換装置
JP2016092977A (ja) * 2014-11-05 2016-05-23 三菱重工業株式会社 故障検出装置、それを備えた空気調和装置、及び故障検出方法並びにプログラム
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JP6699253B2 (ja) 2016-03-10 2020-05-27 富士電機株式会社 電力変換装置、スイッチング素子の短絡故障診断方法およびスイッチング素子のオープン故障診断方法
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JP2013176240A (ja) * 2012-02-27 2013-09-05 Toshiba Mitsubishi-Electric Industrial System Corp 電力変換装置
JP2012210150A (ja) * 2012-08-02 2012-10-25 Toshiba Mitsubishi-Electric Industrial System Corp 多レベル電力変換装置
JP2016092977A (ja) * 2014-11-05 2016-05-23 三菱重工業株式会社 故障検出装置、それを備えた空気調和装置、及び故障検出方法並びにプログラム
JP2020072503A (ja) * 2018-10-29 2020-05-07 富士電機株式会社 電力変換装置

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