WO2020065857A1 - Dispositif de conversion de puissance - Google Patents

Dispositif de conversion de puissance Download PDF

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Publication number
WO2020065857A1
WO2020065857A1 PCT/JP2018/036059 JP2018036059W WO2020065857A1 WO 2020065857 A1 WO2020065857 A1 WO 2020065857A1 JP 2018036059 W JP2018036059 W JP 2018036059W WO 2020065857 A1 WO2020065857 A1 WO 2020065857A1
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Prior art keywords
current
short
circuit
input unit
unit
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PCT/JP2018/036059
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English (en)
Japanese (ja)
Inventor
朋也 勝倉
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東芝三菱電機産業システム株式会社
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Application filed by 東芝三菱電機産業システム株式会社 filed Critical 東芝三菱電機産業システム株式会社
Priority to PCT/JP2018/036059 priority Critical patent/WO2020065857A1/fr
Priority to JP2019525030A priority patent/JP6733818B1/ja
Publication of WO2020065857A1 publication Critical patent/WO2020065857A1/fr

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/66—Regulating electric power
    • G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
    • 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

Definitions

  • FIG. 9 of the above publication describes a configuration in which a plurality of solar cell strings are provided, and an ammeter is provided for each of the solar cell strings.
  • a short circuit occurs between the positive electrode and the negative electrode in a power system
  • a large current flows through the short circuit.
  • This large current is generally cut off by a protection element such as a fuse.
  • the present invention has been made to solve the above-described problems, and has as its object to provide a power converter having a function of detecting a short circuit between a positive electrode and a negative electrode.
  • the first power converter is: A first DC input unit constructed to accept the first DC current, A power conversion circuit that outputs an AC current by converting the first DC current input from the first DC input unit, A first current detector provided in the first DC input unit, It was detected based on the output of the first current detector that the magnitude of the first reverse current flowing in the opposite direction to the first DC current through the first DC input section exceeded a first determination value.
  • a short-circuit detection unit configured to output a first short-circuit detection signal, Is provided.
  • the second power converter is: A first DC input unit constructed to accept the first DC current, A second DC input unit configured to accept a second DC current, A positive input terminal connected to each positive electrode of the first DC input unit and the second DC input unit, and a negative electrode connected to each negative electrode of the first DC input unit and the second DC input unit A power conversion circuit having an input end; A first current detector provided in the first DC input unit, A second current detector provided in the second DC input unit, If the total current value obtained by summing the current value detected by the first current detector and the current value detected by the second current detector exceeds the determination value, a short-circuit detection signal is output. Short-circuit detection unit, Is provided.
  • the short-circuit detection unit can detect whether the first DC current is correctly flowing in the forward direction. . If the first reverse current flowing in the reverse direction is generated, and the magnitude of the first reverse current exceeds the reference level, the reverse current having a magnitude exceeding the normal range is usually assumed. Flows toward the first solar cell strings. In this case, there is a high possibility that a short circuit between the first positive electrode and the negative electrode, which is a short circuit on the first solar cell string side, has occurred. Therefore, the short-circuit detection unit can output a short-circuit detection signal indicating that such a short circuit between the first positive electrode and the negative electrode has occurred.
  • the short-circuit detector can make the determination. If the magnitude of the total current exceeds the reference level, a current having a magnitude exceeding the normal range usually flows toward the power conversion circuit. In this case, there is a high possibility that a short circuit between the second positive electrode and the negative electrode, in which the positive electrode and the negative electrode of the power conversion circuit are short-circuited, has occurred. Thus, the short-circuit detection unit can output a short-circuit detection signal indicating that such a short circuit between the second positive electrode and the negative electrode has occurred.
  • FIG. 2 is a circuit diagram showing a configuration of a power converter according to the embodiment and a first short-circuit mode.
  • FIG. 3 is a block diagram illustrating a first short-circuit detection unit according to the embodiment.
  • FIG. 3 is a circuit diagram illustrating a configuration of a power conversion device according to the embodiment and a second short-circuit mode.
  • FIG. 4 is a block diagram illustrating a second short-circuit detection unit according to the embodiment.
  • FIG. 6 is a diagram for explaining an operation of the second short-circuit detection unit according to the embodiment.
  • FIG. 10 is a block diagram illustrating a second short-circuit detection unit according to a modification of the embodiment. 4 is a configuration example of a control unit according to the embodiment.
  • the “first short-circuit mode” is a mode in which the first positive-negative-electrode short-circuit X1 shown in FIG. 1 has occurred.
  • the “second short-circuit mode” is a mode in which the second short-circuit between the positive electrode and the negative electrode X2 illustrated in FIG. 3 has occurred.
  • FIG. 1 is a circuit diagram showing a configuration of a power conversion device 6 according to the embodiment and a first short-circuit mode.
  • FIG. 1 also shows a photovoltaic power generation system 1 including a power converter 6.
  • the solar power generation system 1 includes a first solar cell string # 1, a second solar cell string # 2, a third solar cell string # 3, a first connection box 4a, a second connection box 4b, and a third It includes a connection box 4c, a power conversion device 6, and a transformer 16.
  • the first solar cell string # 1 includes a plurality of solar cell panels 2a.
  • the first direct current output from each of the plurality of solar cell panels 2a joins inside the first connection box 4a.
  • the second solar cell string # 2 includes a plurality of solar cell panels 2b.
  • the second direct current output from each of the plurality of solar cell panels 2b joins inside the second connection box 4b.
  • first solar cell string # 1 the second solar cell string # 2
  • third solar cell string # 3 may be collectively referred to as "solar cell strings # 1 to # 3".
  • the solar power generation system 1 converts the DC power generated by the solar cell strings # 1 to # 3 into AC power by the power converter 6.
  • the photovoltaic power generation system 1 is connected to the power system 17 in a system interconnection operation.
  • the AC power converted by the power converter 6 is supplied to the power system 17.
  • the power conversion device 6 includes a first DC input unit 91, a second DC input unit 92, a third DC input unit 93, a first current detector 10a, and a second current detection unit. , A third current detector 10c, a DC side circuit breaker 11, a power conversion circuit 12, a DC smoothing capacitor 13, a switch SW, an AC filter circuit 14, an AC side circuit breaker 15, and a control unit. 20.
  • the first DC input unit 91, the second DC input unit 92, and the third DC input unit 93 each include a positive terminal 9a and a negative terminal 9b.
  • the fuse 7 is provided inside each of the first DC input unit 91, the second DC input unit 92, and the third DC input unit 93.
  • a fuse 7 is also provided inside the first connection box 4a, the second connection box 4b, and the third connection box 4c.
  • the positive terminal 9a of the first DC input unit 91 is connected to the positive terminal of the first connection box 4a, and the negative terminal 9b of the first DC input unit 91 is connected to the negative terminal of the first connection box 4a.
  • the first DC input unit 91 is configured to receive the first DC current supplied from the first solar cell string # 1.
  • the positive terminal 9a of the second DC input unit 92 is connected to the positive terminal of the second connection box 4b, and the negative terminal 9b of the second DC input unit 92 is connected to the negative terminal of the second connection box 4b.
  • the second DC input unit 92 is configured to receive the second DC current supplied from the second solar cell string # 2.
  • the positive terminal 9a of the third DC input unit 93 is connected to the positive terminal of the third connection box 4c, and the negative terminal 9b of the third DC input unit 93 is connected to the negative terminal of the third connection box 4c.
  • the third DC input unit 93 is configured to receive a third DC current supplied from the third solar cell string # 3.
  • the first current detector 10a is provided at a stage subsequent to the fuse 7 in the first DC input unit 91.
  • the first current detector 10a detects a current flowing via the first DC input unit 91.
  • the first current detector 10a outputs a first detected current value Ist1 , which is a detected current value, to the control unit 20.
  • the second current detector 10b is provided at a stage subsequent to the fuse 7 in the second DC input unit 92.
  • the second current detector 10b detects a current flowing via the second DC input unit 92.
  • the second current detector 10b outputs a second detected current value Ist2 , which is a detected current value, to the control unit 20.
  • the third current detector 10c is provided after the fuse 7 in the third DC input unit 93.
  • the third current detector 10c detects a current flowing through the third DC input unit 93.
  • the third current detector 10c outputs a third detected current value Ist3 , which is the detected current value, to the control unit 20.
  • the direction of the current flowing into the input side of the power conversion circuit 12 is “forward”. In the embodiment, the direction of the current flowing from the input side of the power conversion circuit 12 is referred to as “reverse direction”.
  • the first current detector 10a, the second current detector 10b, and the third current detector 10c measure the forward current flowing into the power conversion circuit 12 as a positive value, and measure the forward current in the opposite direction to the forward current. The current can be measured as a negative value.
  • the DC side circuit breaker 11 is provided on the input side of the power conversion circuit 12.
  • a DC smoothing capacitor 13 is provided between the DC circuit breaker 11 and the power conversion circuit 12.
  • the AC side circuit breaker 15 is provided on the output side of the power conversion circuit 12.
  • An AC filter circuit 14 is provided between the power conversion circuit 12 and the AC circuit breaker 15.
  • the power conversion circuit 12 is an inverter circuit that converts DC power into three-phase AC power.
  • the power conversion circuit 12 is constructed by a plurality of semiconductor switching elements (not shown).
  • the power conversion circuit 12 has a positive input terminal 12a and a negative input terminal 12b.
  • the positive input terminal 12a is connected to the positive DC wiring 61a in the power converter 6.
  • the positive terminal 9a of the first DC input unit 91, the positive terminal 9a of the second DC input unit 92, and the positive terminal 9a of the third DC input unit 93 are connected to the positive DC line 61a.
  • the negative input terminal 12b is connected to the negative DC wiring 61b in the power converter 6.
  • the negative terminal 9b of the first DC input unit 91, the negative terminal 9b of the second DC input unit 92, and the negative terminal 9b of the third DC input unit 93 are connected to the negative DC line 61b.
  • the control unit 20 includes a first short-circuit detection unit 21 and a second short-circuit detection unit 22.
  • the first short-circuit detection unit 21 detects the first positive-negative-electrode short-circuit X1 shown in FIG. 1, it outputs a switch-on signal S1, circuit breaker trip signals S2, S3, and an alarm signal S4a.
  • the first short-circuit detection unit 21 includes a first block 21a, a second block 21b, and a third block 21c.
  • the alarm signal S4a includes an alarm signal S41 output from the first block 21a, an alarm signal S42 output from the second block 21b, and an alarm signal S43 output from the third block 21c.
  • the first positive-negative electrode short-circuit X1 is based on the first current detector 10a, the second current detector 10b, and the third current detector 10c as reference positions, and is closer to the solar cell strings # 1 to # 3 than the reference positions. This is a short circuit between the positive electrode and the negative electrode that occurs. Specifically, between the first connection box 4a and the first DC input section 91, between the second connection box 4b and the second DC input section 92, between the third connection box 4c and the third DC input section 93. The first short-circuit between the positive electrode and the negative electrode X1 occurs in at least one of the two. The first positive-negative electrode short-circuit X1 may occur further on the solar cell strings # 1 to # 3 side than the first connection box 4a to the third connection box 4c.
  • FIG. 1 shows, as an example, a case in which a first positive-negative-electrode short circuit X1 occurs between the first junction box 4a and the first DC input unit 91.
  • the current Ix1 flows to the short-circuit point of the first positive-negative electrode short-circuit X1.
  • the current Ix1 is the sum of the DC currents input from the second DC input unit 92 and the third DC input unit 93.
  • the second short-circuit detecting unit 22 detects the second positive-negative-electrode short-circuit X2 (see FIG. 3 described later), it outputs a switch-on signal S1, circuit breaker trip signals S2 and S3, and an alarm signal S4b.
  • the configuration and operation of the second short-circuit detector 22 will be described later with reference to FIGS.
  • one end of the switch SW is connected to the positive input terminal 12a via the positive DC line 61a.
  • the other end of the switch SW is connected to the negative input terminal 12b via the negative DC line 61b.
  • the switch SW is turned on in response to the switch-on signal S1 output by the first short-circuit detection unit 21. When the switch SW is turned on, the positive input terminal 12a and the negative input terminal 12b conduct.
  • the DC-side circuit breaker 11 is tripped in response to the circuit breaker trip signal S2.
  • the AC side circuit breaker 15 is tripped in response to the circuit breaker trip signal S3.
  • the alarm signal S4a and the alarm signal S4b may be transmitted to a monitoring device (not shown) provided outside the power conversion device 6.
  • a monitoring device not shown
  • an alarm may be displayed on an alarm device (not shown) provided on the housing of the power conversion device 6 or on the periphery thereof.
  • FIG. 2 is a block diagram illustrating the first short-circuit detection unit 21 according to the embodiment.
  • Each of the first block 21a, the second block 21b, and the third block 21c includes a determination value acquisition block 33 and a first comparison block 34.
  • the determination value obtaining block 33 multiplies a predetermined determination reference value Istr by a negative coefficient of minus 1 to obtain a first reverse current determination.
  • a value Iref1a , a second reverse current determination value Iref1b, and a third reverse current determination value Iref1c are calculated.
  • the third reverse current determination value I Ref1c is a value determined from a predetermined determination reference value I str.
  • the first reverse current determination value Iref1a , the second reverse current determination value Iref1b, and the third reverse current determination value Iref1c may be a common value or different values.
  • the first reverse current determination value Iref1a , the second reverse current determination value Iref1b, and the third reverse current determination value Iref1c are determined by the first solar cell string # 1, the second solar cell string # 2, and the third solar cell string # 3 is preferably set based on the rated current according to each power generation capacity. Specifically, when the rated current of the first solar cell string # 1 is 100 A, a reverse current can be permitted if the rated current is equal to or less than the rated current. That is, it is possible to tolerate up to minus 100A.
  • the first reverse current determination value Iref1a may be set to any value within the range of 1 to 2 times the rated current of the first solar cell string # 1.
  • the second reverse current determination value I ref1b and the third reverse current determination value I ref1c can be determined in the same manner as the first reverse current determination value I ref1a .
  • the “first reverse current” is a current flowing through the first DC input unit 91 in a direction opposite to the first DC current output from the first solar cell string # 1.
  • the first reverse current is measured as a negative current in the first current detector 10a.
  • the detection operation of the first block 21a is realized by the following specific logic by considering the direction of current flow, that is, the sign of the detected current value.
  • the first comparison block 34 compares the first reverse current determination value I ref1a with the first detected current value I st1 . When than the first reverse current determination value I Ref1a is first detected current value I st1 becomes small, the output of the first comparator block 34 becomes high.
  • the first reverse current determination value I ref1a is set to minus 200 A by setting the determination reference value I str to 200A.
  • the first detected current value Ist1 becomes, for example, ⁇ 300 A or the like.
  • the first detection current value I st1 has become a large value in the negative side exceeds the negative 200A is the first reverse current determination value I ref1a. That is, a situation occurs in which a reverse current is flowing, and the absolute value of the measured value of the reverse current exceeds the determination reference value.
  • the output of the first comparison block 34 becomes high.
  • the high output of the first comparison block 34 is the first short-circuit detection signal SX1a.
  • the output of the first comparator block 34 is low.
  • the first reverse current determination value I ref1a is set to minus 200A and the measured first detection current value I st1 is minus 100A.
  • the “magnitude of the current flowing in the negative direction, that is, the reverse direction” in the first DC input unit 91 is 100 A, which is determined to be within the allowable range. That is, a situation where the first detection current value I st1 flows largely the opposite direction enough to exceed the first reverse current determination value I Ref1a is not generated. In this case, the output of the first comparison block 34 remains low.
  • the first short-circuit detection signal SX1a is output to the outside of the control unit 20 in the form of the switch-on signal S1, the breaker trip signals S2, S3, and the alarm signal S41 through the output interface of the first block 21a.
  • the alarm signal S41 is a type of the alarm signal S4a, and indicates that a short circuit between the positive electrode and the negative electrode has occurred on the first DC input unit 91 side.
  • the second block 21b is first Two short-circuit detection signals SX1b are output.
  • the second reverse current is a current that flows through the second DC input unit 92 in a direction opposite to the second DC current output by the second solar cell string # 2. Also in the second block 21b, a detection operation taking into account the sign of the current value is constructed in the same manner as in the first block 21a.
  • the second short-circuit detection signal SX1b is output to the outside of the control unit 20 in the form of the switch-on signal S1, the breaker trip signals S2 and S3, and the alarm signal S42 through the output interface of the second block 21b.
  • the alarm signal S42 is a kind of the alarm signal S4a, and indicates that the first positive-negative electrode short-circuit X1 has occurred on the side of the second DC input unit 92.
  • the third block 21c When it is detected based on the third detection current value Ist3 of the third current detector 10c that the magnitude of the third reverse current exceeds the third reverse current determination value Iref1c , the third block 21c performs the third block 21c.
  • a short-circuit detection signal SX1c is output.
  • the third reverse current is a current that flows through the third DC input unit 93 in a direction opposite to the third DC current output by the third solar cell string # 3. Also in the third block 21c, a detection operation taking into account the polarity of the current value is constructed in the same manner as in the first block 21a.
  • the third short-circuit detection signal SX1c is output to the outside of the control unit 20 in the form of the switch-on signal S1, the breaker trip signals S2 and S3, and the alarm signal S43 through the output interface of the third block 21c.
  • the alarm signal S43 is a type of the alarm signal S4a, and indicates that the first positive-negative electrode short-circuit X1 has occurred on the side of the third DC input unit 93.
  • the first short-circuit detection unit 21 can detect whether the direct current is flowing correctly in the forward direction. If the first reverse current flowing in the reverse direction has occurred and the magnitude of the first reverse current exceeds a predetermined reference, the reverse current having a magnitude exceeding the normally assumed range is usually generated. It flows toward the first solar cell string # 1. In this case, it is highly possible that the first positive-negative electrode short-circuit X1 in the first short-circuit mode has occurred on the first solar cell string # 1 side.
  • Such a short-circuit detection principle can be similarly applied to a current flowing through the second DC input unit 92 and the third DC input unit 93.
  • the first short-circuit detection unit 21 can output the first short-circuit detection signal SX1a indicating that the first positive-negative-electrode short-circuit X1 in the first short-circuit mode has occurred. Similarly, the first short-circuit detection unit 21 generates a second short-circuit detection signal indicating that the first positive-negative short-circuit X1 in the first short-circuit mode has occurred in the second DC input unit 92 and the third DC input unit 93. SX1b and the third short-circuit detection signal SX1c can be output.
  • the first short-circuit detection signal SX1a, the second short-circuit detection signal SX1b, and the third short-circuit detection signal SX1c are separately output, the first DC input unit 91, the second DC input unit 92, and the third DC input unit It is also possible to discriminately detect which of 93 has caused the short circuit.
  • FIG. 3 is a circuit diagram showing a configuration of the power conversion device 6 according to the embodiment and a second short-circuit mode. Since the configuration of the power conversion device 6 and the configuration of the photovoltaic power generation system 1 are the same in FIG. 1 and FIG. 3, the description of the configuration is omitted.
  • the second short-circuit mode that is, the second short-circuit between the positive electrode and the negative electrode X2 is a short-circuit that occurs between the positive-electrode DC wiring 61a and the negative-electrode DC wiring 61b.
  • the short-circuit current Ix4 flows to the short-circuit location of the second short-circuit between the positive electrode and the negative electrode X2.
  • the short-circuit current Ix4 is a current obtained by summing the current input from the first DC input unit 91 and the sum of the currents input from the second DC input unit 92 and the third DC input unit 93 (that is, the current Ix1). It is.
  • FIG. 4 is a block diagram illustrating the second short-circuit detection unit 22 according to the embodiment.
  • the second short-circuit detection unit 22 includes a total value calculation block 41, a low-pass filter block 42, a gain block 43, and a second comparison block 44.
  • Total value calculation block 41 by adding the first detected current value I st1 and the second detected current value I st2 and a third detected current value I st3, calculates a total current value I stsum.
  • the total current value Istsum is input to the second comparison block 44 and the low-pass filter block 42.
  • the low-pass filter block 42 can dampen the change so as not to transmit the change to the subsequent circuit.
  • the time constant of the low-pass filter block 42 is set to a value that allows a gradual change in current caused by fluctuations in solar radiation to pass, and is set to an appropriate value that can prevent a sudden change in current when a short circuit occurs.
  • the gain block 43 multiplies the input value by a predetermined gain coefficient K.
  • the low-pass filter block 42 performs filtering on the total current value I stsum .
  • the value passed through the low-pass filter block 42 is multiplied by a gain coefficient K in a gain block 43.
  • the gain coefficient may be set to any value within a range of 1.1 to 1.5, for example.
  • the gain block 43 is preferably constructed so that the gain coefficient K can be variably set afterwards.
  • the calculated value multiplied by the gain coefficient K is input to the second comparison block 44 as the total determination value I sumref .
  • FIG. 5 is a diagram for explaining the operation of the second short-circuit detection unit 22 according to the embodiment.
  • a schematic graph of the total current value I stsum is shown by a solid line, and the corresponding total determination value I sumref is shown by a broken line.
  • the gradual fluctuation of the total current value I stsum schematically represents the solar radiation fluctuation. Since the low-pass filter block 42 allows the current change due to the solar radiation fluctuation, the total current value I stsum and the total determination value I sumref gradually change in the same tendency.
  • the low-pass filter block 42 blocks a steep change in the total current value I stsum at the time tx. Therefore, even at time tx, the total determination value I sumref holds the value immediately before the occurrence of the short circuit. Since the total current value I Stsum total determination value I Sumref Whereas constant increases sharply, points total current value I Stsum indicated by reference numeral Q increases beyond the total judgment value I sumref.
  • the second comparison block 44 compares the total current value Istsum with the total determination value Isumref .
  • the output of the first comparison block 34 is low.
  • the output of the second comparison block 44 becomes high. That is, the total current value I sumsum exceeds the total determination value I sumref to the plus side.
  • the high output of the second comparison block 44 is the short-circuit detection signal SX2.
  • the second short-circuit detection unit 22 can determine whether or not the size is appropriate. If the magnitude of the total current exceeds a predetermined reference, a current larger than the original current flows to the power conversion circuit 12 side. In this case, there is a high possibility that the second short-circuit between the positive electrode and the negative electrode in the second short-circuit mode X2 has occurred in the previous stage of the power conversion circuit 12. Therefore, the second short-circuit detection unit 22 can output the short-circuit detection signal SX2 indicating that the second short-circuit between the positive electrode and the negative electrode X2 in the second short-circuit mode has occurred.
  • the provision of the low-pass filter block 42 and the gain block 43 also has the following advantages.
  • the number of solar cell strings # 1 to # 3 and the current value for each solar cell string differ for each power system.
  • different power systems also have different appropriate sum determination values I sumref for determining the total current.
  • an appropriate total determination value I sumref is calculated by performing an operation on the total current value I stsum by the low-pass filter block 42 and the gain block 43.
  • the gain coefficient K is 1.1 to 1.5, a value 1.1 to 1.5 times the actually input total current value I stsum is used as the total determination value I sumref . Can be set. As a result, even if the current flowing at the time of the short circuit between the positive electrode and the negative electrode is small, the second short circuit X2 between the positive electrode and the negative electrode can be detected quickly and accurately.
  • Gain coefficient K can be set to any value greater than one.
  • the switch SW is turned on in response to the switch-on signal S1 output from the second short-circuit detection unit 22.
  • a path for flowing a short-circuit current can be intentionally created, so that the current flowing to the generated short-circuit portion can be reduced. Therefore, the protection function is perfect for both the first short-circuit mode and the second short-circuit mode.
  • the control unit 20 switches at least one of the DC-side circuit breaker 11 and the AC-side circuit breaker 15. It is built to trip. Therefore, the protection function can be further improved.
  • the control unit 20 includes both the first short-circuit detection unit 21 and the second short-circuit detection unit 22. Therefore, the first short-circuit between the positive electrode and the negative electrode X1 in the first short-circuit mode and the second short-circuit between the positive electrode and the negative electrode X2 in the second short-circuit mode can be detected separately.
  • an alarm signal S4a (more specifically, S41, S42, S43) is output according to the first positive-negative short-circuit X1
  • an alarm signal S4b is output according to the second positive-negative short-circuit X2. .
  • a band-pass filter block may be used instead of the low-pass filter block 42 in FIG.
  • This band-pass filter block may be provided with a filter function for blocking a signal in a high-frequency range similarly to the low-pass filter block 42.
  • the order of the low-pass filter block 42 and the gain block 43 may be opposite to that in FIG. 4, that is, the gain block 43 may be in the preceding stage.
  • FIG. 6 is a block diagram illustrating a second short-circuit detection unit 22 according to a modification of the embodiment.
  • the determination value setting unit 143 stores the total determination value I sumref in a rewritable manner.
  • the total determination value I sumref is a fixed value or a variable set value determined independently of the total current value I stsum .
  • the power conversion device 6 including only one of the first short-circuit detection unit 21 and the second short-circuit detection unit 22 may be provided.
  • a solar power generation system 1 including three solar cell strings # 1 to # 3 is provided.
  • the number of solar cell strings is not limited to three.
  • the number of solar cell strings may be one, two, or four or more.
  • the above-described various determination values may be adjusted according to the number of connected solar cell strings.
  • FIG. 7 is a configuration example of the control unit 20 according to the embodiment.
  • FIG. 7 is a hardware configuration diagram applicable to the control unit 20 according to the embodiment of the present invention. As shown in FIG. 7, each function of the control unit 20 can be realized by the processing circuit 50.
  • the processing circuit 50 includes a processor 51 and a memory 52.
  • the processor 51 is a CPU (Central Processing Unit) such as a central processing unit, a processing unit, a microprocessor, a microcomputer, a processor, or a DSP.
  • the memory 52 is a non-volatile or volatile semiconductor memory such as a RAM, a ROM, a flash memory, an EPROM, an EEPROM, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, and a DVD.
  • a program stored in the memory 52 is executed by the processor 51.
  • the power conversion device 6 is not limited to only the photovoltaic power generation use.
  • a constant current power source other than a solar cell may be connected to the power converter 6.
  • Reference Signs List 1 solar power generation system # 1 first solar cell string, # 2 second solar cell string, # 3 third solar cell string, 2a, 2b, 2c solar panel, 4a first connection box, 4b second connection box 4c third connection box, 6 power converter, 7 fuse, 9a positive terminal, 9b negative terminal, 10a first current detector, 10b second current detector, 10c third current detector, 11 DC circuit breaker, Reference Signs List 12 power conversion circuit, 12a positive input terminal, 12b negative input terminal, 13 DC smoothing capacitor, 14 AC filter circuit, 15 AC circuit breaker, 16 transformer, 17 power system, 20 control unit, 21 first short circuit detection unit, 21a first block, 21b second block, 21c third block, 22 second short circuit detector, 33 judgment value acquisition block, 34 first comparison block, 41 total value calculation block Block, 42 low-pass filter block, 43 gain block, 44 second comparison block, 50 processing circuit, 51 processor, 52 memory, 61a positive DC wiring, 61b negative DC wiring, 91 first DC input section, 92 second DC Input unit, 93 third DC input

Abstract

La présente invention concerne un dispositif de conversion de puissance comprenant : une première unité d'entrée de courant continu conçue pour pouvoir recevoir un premier courant continu ; un circuit de conversion de puissance qui délivre un courant alternatif par conversion de la première entrée de courant continu provenant de la première unité d'entrée de courant continu ; un premier détecteur de courant placé dans la première unité d'entrée de courant continu ; et une unité de détection de court-circuit conçue pour émettre un premier signal de détection de court-circuit lorsqu'il est détecté que la taille d'un premier courant inverse qui circule à travers la première unité d'entrée de courant continu dans la direction inverse au premier courant continu dépasse une première valeur d'évaluation sur la base de la sortie du premier détecteur de courant. Le dispositif de conversion de puissance peut également comprendre en outre : une seconde unité d'entrée de courant continu qui peut recevoir un second courant continu ; et un second détecteur de courant placé dans la seconde unité d'entrée de courant continu. L'unité de détection de court-circuit peut également être conçue pour émettre un second signal de détection de court-circuit lorsqu'il est détecté que la taille d'un second courant inverse qui circule à travers la seconde unité d'entrée de courant continu dans la direction inverse au second courant continu dépasse une seconde valeur de jugement prédéfinie sur la base de la sortie du second détecteur de courant.
PCT/JP2018/036059 2018-09-27 2018-09-27 Dispositif de conversion de puissance WO2020065857A1 (fr)

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PCT/JP2018/036059 WO2020065857A1 (fr) 2018-09-27 2018-09-27 Dispositif de conversion de puissance
JP2019525030A JP6733818B1 (ja) 2018-09-27 2018-09-27 電力変換装置

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI737514B (zh) * 2020-10-13 2021-08-21 台達電子工業股份有限公司 具有保護電路的升壓轉換模組

Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2012019646A (ja) * 2010-07-09 2012-01-26 Daihen Corp 電力変換装置の制御装置、および、この制御装置を用いた系統連系インバータシステム
WO2012046331A1 (fr) * 2010-10-07 2012-04-12 東芝三菱電機産業システム株式会社 Appareil de détection de défauts
JP2012253848A (ja) * 2011-05-31 2012-12-20 Toshiba Corp 太陽光発電システム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012019646A (ja) * 2010-07-09 2012-01-26 Daihen Corp 電力変換装置の制御装置、および、この制御装置を用いた系統連系インバータシステム
WO2012046331A1 (fr) * 2010-10-07 2012-04-12 東芝三菱電機産業システム株式会社 Appareil de détection de défauts
JP2012253848A (ja) * 2011-05-31 2012-12-20 Toshiba Corp 太陽光発電システム

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI737514B (zh) * 2020-10-13 2021-08-21 台達電子工業股份有限公司 具有保護電路的升壓轉換模組

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