WO2007110913A1 - 系統連系インバータ装置 - Google Patents
系統連系インバータ装置 Download PDFInfo
- Publication number
- WO2007110913A1 WO2007110913A1 PCT/JP2006/306168 JP2006306168W WO2007110913A1 WO 2007110913 A1 WO2007110913 A1 WO 2007110913A1 JP 2006306168 W JP2006306168 W JP 2006306168W WO 2007110913 A1 WO2007110913 A1 WO 2007110913A1
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- WO
- WIPO (PCT)
- Prior art keywords
- semiconductor switch
- circuit
- power
- terminal
- diode
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Definitions
- the present invention relates to an inverter device, and more particularly to a grid-connected inverter device for linking DC power such as solar cells and fuel cells to an AC power system.
- a boost converter to which DC power is input is configured as a full bridge via an intermediate-stage capacitor.
- the boost converter and inverter An inverter protection unit that stops the oscillation operation of the inverter and a capacitor discharge unit that discharges the accumulated charge of the output capacitor provided in the filter based on the output of the inverter protection unit are shown. .
- Patent Document 1 JP 2001-186664 A
- Patent Document 2 JP-A-11 196527
- An inverter protection unit is provided to quickly stop the oscillation operation of the boost converter and inverter when an overvoltage or overcurrent occurs.
- the present invention has been made in view of the above, and does not impair efficiency. Also, even when a negative voltage is applied to the input side due to incorrect connection, an overcurrent protection element such as a fuse is provided. It is an object of the present invention to provide a grid-connected inverter device that can protect a step-up switching element and the like without using any other means, and that does not interfere with immediate normal operation after correcting a misconnection.
- a grid-connected inverter device includes a converter that boosts and Z or steps down DC power, and an inverter that converts the output of the converter into AC power And a pair of capacitors connected in series between a pair of DC buses connecting each input terminal of the DC power and the converter, and connecting the output of the inverter to the AC power system
- the DC power connected in the positive and negative polarity is connected to the positive or negative input end of the pair of DC buses at the input end side of the positive side bus or the negative side bus.
- a short-circuit current cutoff diode that is inserted in a direction that does not cut off the flow of current flowing through the pair of DC buses, and one end side of the short-circuit current cutoff diode is connected to the input end side of the DC power,
- a semiconductor switch connected to the other end of the short-circuit current interrupting diode, a semiconductor switch driving circuit for driving the semiconductor switch, and a negative power that causes a current to flow from the negative electrode side to the positive electrode side of the input terminal.
- a semiconductor switch-off circuit that controls the semiconductor switch drive circuit to be turned off when applied, and a control circuit that controls the semiconductor switch drive circuit.
- the short-circuit current interrupting diode is integrated. Since it is inserted into either the positive side DC bus or the negative side DC bus that constitutes the pair of DC buses, for example, the short-circuit current flowing through the free wheel diode of the semiconductor switch provided in the converter or the like can be The effect of being able to cut off without using a current protection element is obtained.
- a semiconductor switch is connected to this short-circuit current cutoff diode, and the semiconductor that drives this semiconductor switch when negative power is applied so that current flows in the direction toward the negative side of the DC power input terminal.
- the switch drive circuit is configured to include a semiconductor switch-off circuit that forcibly turns off the switch drive circuit, even if AC power or DC power is misconnected, it is safe and reliable that the converter and inverter do not operate. The effect that the stop state can be maintained is obtained.
- FIG. 1 is a diagram showing a circuit configuration of a grid-connected inverter device according to a first embodiment of the present invention.
- FIG. 2 is a diagram showing a circuit configuration of a grid-connected inverter device according to a second embodiment of the present invention.
- FIG. 3 is a diagram showing a configuration example of the semiconductor SW off circuit shown in FIGS. 1 and 2.
- FIG. 4 is a diagram showing another configuration example different from FIG. 3 of the semiconductor SW off circuit shown in FIGS. 1 and 2.
- Fig. 1 shows the circuit configuration of the grid-connected inverter device according to the first embodiment of the present invention. It is a figure.
- the DC input terminals 17 and 18 of the grid interconnection inverter device 2 are connected to the DC power 1 that is, for example, the solar cell output and the fuel cell output shown in the connection mode when normally connected.
- the grid-connected inverter device 2 shown in FIG. 1 includes input capacitors 8a and 8b, a boost converter 29, and an inverter 14, which are typical components of the grid-connected inverter device.
- boost converter 29 includes semiconductor switches 11a, l ib, diodes 12a, 12b for boost converters, and diodes for boost converters, in which diodes are connected in parallel to semiconductor switching elements such as boost converter rear tutors 10a, 10b, IGBT, etc.
- Capacitors 13a and 13b are provided.
- the grid interconnection inverter device 2 of this embodiment in addition to these components, the following components that characterize the present invention are provided.
- semiconductor SW off circuit semiconductor switch-off circuit
- semiconductor SW drive circuit semiconductor switch drive circuit
- voltage monitoring means 9a and 9b for monitoring the terminal voltages of the input capacitors 8a and 8b are provided toward the AC output terminals 31 and 32, respectively, and the outputs thereof are the semiconductor SW drive circuit 5 and the relay 6 described later.
- the short-circuit current interrupting diode 3 is inserted into the negative-polarity DC bus 35 in such a direction as not to interrupt the current that flows when the DC power is correctly connected (that is, as shown in the illustrated DC power 1).
- the power sword of the short-circuit current interrupting diode 3 is connected to the DC input terminal 18 side.
- a semiconductor switch 4 in which a diode is connected in reverse parallel to a semiconductor switching element such as an IGBT is inserted into the DC bus 35 on the negative electrode side.
- the short circuit current cutoff diode 3 and the semiconductor switch 4 are connected with their anodes facing each other, and the short circuit current cutoff diode 3 is connected to the DC bus 35 to which the semiconductor SW off circuit 7 is connected.
- a relay is provided in parallel with each of the short-circuit current cutoff diode and the semiconductor switch. You may comprise as follows.
- the circuit configuration shown in FIG. 1 in which the short-circuit current cutoff diode 3, the semiconductor switch 4, and the relay 6 are inserted or connected to the DC bus 35 on the negative electrode side is not a very general configuration!
- the short-circuit current cutoff diode 3 and the semiconductor switch 4 and the relay 6 may be inserted into or connected to the DC bus 34 on the positive side.
- short-circuit current cutoff diode 3 is inserted between the connection point of DC bus 34 to which semiconductor SW off circuit 7 is connected and the connection point of DC bus 34 to which semiconductor SW drive circuit 5 is connected.
- a semiconductor switch 4 is inserted between the connection point of the DC bus 34 to which the semiconductor SW drive circuit 5 is connected and the connection point of the DC bus 34 to which the input capacitor 8a is connected, and the short-circuit current cutoff diode 3 And the semiconductor switch 4 in such a way that the force swords of each other face each other, and the relay 6 is connected to both ends of the series circuit of the short-circuit current interrupting diode 3 and the semiconductor switch 4.
- either the short-circuit current cutoff diode 3 or the semiconductor switch 4 may be inserted into the DC bus 34 on the positive electrode side.
- the connection point of the DC bus 34 to which the semiconductor SW off circuit 7 is connected and the DC bus 34 to which the semiconductor SW drive circuit 5 is connected When the semiconductor switch 4 is inserted into the DC bus 34 on the positive electrode side between the connection point and the DC bus 34 on the positive electrode side, the connection point of the DC bus 34 to which the semiconductor SW drive circuit 5 is connected is connected to the input capacitor 8a. If it is inserted between the connection points of the DC bus 34 and relays are provided at both ends, it can be configured.
- the short-circuit current cutoff diode 3 is inserted into the DC bus 35.
- the short-circuit current flowing through the free wheel diode (FWD) in the semiconductor switch 11a, l ib of the boost converter 29 can be cut off without using an overcurrent protection element such as a fuse.
- the semiconductor switch 4 connected in series with the anode of the short-circuit current interrupting diode 3 has a function of automatically turning on itself when a normal DC power is applied at a constant voltage, for example, 10 to 30 V or more. Is done. Note that the on / off state of the semiconductor switch 4 is also controlled by the semiconductor SW drive circuit 5 controlled by the control circuit 15. On the other hand, the semiconductor SW off circuit 7 forcibly operates when negative power is applied by the AC power 16 incorrectly connected at the DC input end side or the DC power 30 reversely connected, and the semiconductor SW drive circuit 5 Forcibly stop and turn off semiconductor switch 4.
- control circuit 15 controls the semiconductor SW drive circuit 5 and the relay 6 based on the terminal voltages of the input capacitors 8a and 8b monitored by the voltage monitoring means 9a and 9b. As described above, the semiconductor switch 4 is automatically turned on when the normal DC power 1 is applied to a certain voltage or higher. At this time, the relay 6 is in the off state. On the other hand, when it is confirmed that the voltage monitoring means 9a and 9b are normal, the control circuit 15 turns on the relay 6 and then turns off the semiconductor switch 4.
- the current path during normal operation of the grid-connected inverter device 2 becomes a path including the relay 6, and it is not necessary to consider the loss due to the short-circuit current cutoff diode 3 and the semiconductor switch 4, so that high efficiency is achieved. It is possible to configure a protection circuit that does not impair the efficiency of the required grid-connected inverter device.
- the control circuit 15 turns on the relay 6 for the first time after confirming that the voltage monitoring means 9a, 9b is normal. 1
- a negative power is applied by 6 or reversely connected DC power 30
- a path that bypasses the short-circuit current blocking diode 3 (a bypass path by the relay 6) is not formed.
- either the positive-side DC bus or the negative-side DC constituting the pair of DC buses is inserted into the short-circuit current interrupting diode. Therefore, for example, the short circuit current flowing through the free wheel diode of the semiconductor switch provided in the converter or the like can be cut off without using an overcurrent protection element such as a fuse.
- a semiconductor switch is connected to this short-circuit current cutoff diode, and this semiconductor switch is driven when negative power is applied so that current flows from the negative side to the positive side of the DC power input terminal. Since the semiconductor switch drive circuit is configured to include a semiconductor switch-off circuit that forcibly turns off the semiconductor switch drive circuit, even if AC power or DC power is misconnected, the comparator does not operate and safe. In addition, a reliable stop state can be maintained.
- the output of DC power 1 becomes a high voltage (for example, 1000 VDC or more), and when the device is turned on, the DC power 1 that is a high voltage is directed to a capacitor of substantially zero voltage.
- a desired resistance element should be inserted between the short-circuit current cutoff diode 3 and the semiconductor switch 4 or at either end of these series circuits. May be. Even if such a resistance element is inserted, after the semiconductor switch 4 is turned on, the relay 6 connected in parallel is turned on and the path including the semiconductor switch 4 is bypassed. There is no increase in loss due to insertion.
- FIG. 2 is a diagram illustrating a circuit configuration of the grid-connected inverter device according to the second embodiment of the present invention.
- the control circuit power supply 21 is provided.
- the control circuit power supply 21 has an input side of AC power 16 half cycle of power.
- the control circuit power supply capacitor 22 having a sufficiently chargeable capacity is connected to the positive side branch end 19 on the DC bus 34 and the negative side branch end 20 on the DC bus 35 (the anodes of the short-circuit current cutoff diode 3 and the semiconductor switch 4). And a charging diode 24 between them.
- the other configurations are the same as or equivalent to those of the first embodiment shown in FIG. 1, and the same reference numerals are given to those components, and a detailed description for the configuration and operation is given. Omitted.
- the negative electrode of the control circuit power supply 21 is drawn from the connection point (negative electrode branch end 20) to which the anodes of the short-circuit current interrupting diode 3 and the semiconductor switch 4 are connected.
- the short-circuit current due to the negative power of the AC power 16 is cut off by the action of the short-circuit current cut-off diode 3, and the operation of the semiconductor SW drive circuit 5 is stopped by the action of the semiconductor SW off circuit 7, so that the boost converter 29, Inverter 14 can operate only the control circuit 15 with half-power of AC power 16 while maintaining a safe and reliable stop state without operating.
- the control circuit 15 can detect the abnormality of the control circuit power supply capacitor 22 due to the application of the AC power 16 through the voltage monitoring means 9a, 9b, and the alarm connected to the control circuit 15
- the device 23 can issue a desired alarm.
- this alarm action can issue an alarm to the local worker for an abnormality of the grid-connected inverter device caused by the incorrect connection of AC power, and whether or not the cause of the device error is an incorrect connection. Can be easily identified.
- the abnormality detection of the voltage monitoring means 9a, 9b can be performed using a method that compares the instantaneous value and the average value of the terminal voltages of the voltage monitoring means 9a, 9b, for example.
- the embodiment Similar to 1 the switching of the switching means can be controlled based on the monitored terminal voltage of the capacitor, and the same effect as in the first embodiment can be obtained.
- FIG. 3 is a diagram showing an example of the configuration of the semiconductor SW off circuit 7 shown in FIGS. 1 and 2, and it is shown together with some other components related to the operation.
- the semiconductor The SW off circuit 7 includes a discharge transistor 25 and a bypass diode 27 as main components.
- a drive circuit power capacitor 28 acting as an operation power source for the semiconductor SW drive circuit 5 is connected via a collector resistor between the collector of the discharge transistor 25 and the emitter. The discharge path is configured.
- the semiconductor SW off circuit 7 As shown in FIG. 3, the semiconductor SW drive circuit 5 does not operate even when AC power or DC power is misconnected, and the semiconductor Switch 4 is turned off and relay 6 does not work.
- the semiconductor switch 4 is turned on when normal DC power is applied to a certain voltage or more as described above. Therefore, the semiconductor switch 4 is not turned on in the positive half cycle of the AC power, and the input capacitors 8a and 8b are charged. It will not be charged.
- the step-up converter 29 and the inverter 14 can maintain a safe and reliable stop state without operating, and even if an incorrect connection is corrected immediately, there is no electric shock.
- FIG. 4 is a diagram illustrating another configuration example different from that of FIG. 3 of the semiconductor SW off circuit 7 illustrated in FIGS. 1 and 2, and illustrates the configuration together with some other components related to the operation.
- the semiconductor SW off circuit 7 includes a discharge photopower bra 26 and a bypass diode 27 as main components.
- the discharge photo power bra 26-2 A drive circuit power supply capacitor 28 is connected between the collector and the emitter of the secondary phototransistor via a collector resistor, and a discharge path of the drive circuit power supply capacitor 28 is formed.
- the semiconductor SW off circuit 7 As shown in FIG. 4, the semiconductor SW drive circuit 5 does not operate even when AC power or DC power is misconnected, and the semiconductor Switch 4 is turned off and relay 6 does not work.
- the semiconductor switch 4 is turned on when normal DC power is applied to a certain voltage or more as described above. Therefore, the semiconductor switch 4 is not turned on in the positive half cycle of the AC power, and the input capacitors 8a and 8b are charged. It will not be charged.
- the step-up converter 29 and the inverter 14 can maintain a safe and reliable stop state without operating, and even if an incorrect connection is corrected immediately, there is no electric shock.
- the grid-connected inverter device according to the present invention is useful as a grid-connected inverter device for linking DC power such as solar cells and fuel cells to an AC power system.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006520593A JP4890247B2 (ja) | 2006-03-27 | 2006-03-27 | 系統連系インバータ装置 |
EP06730116A EP1887672A4 (en) | 2006-03-27 | 2006-03-27 | SYSTEM link INVERTER DEVICE |
US11/579,534 US7839665B2 (en) | 2006-03-27 | 2006-03-27 | System interconnection inverter including overvoltage and negative voltage protection |
PCT/JP2006/306168 WO2007110913A1 (ja) | 2006-03-27 | 2006-03-27 | 系統連系インバータ装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2006/306168 WO2007110913A1 (ja) | 2006-03-27 | 2006-03-27 | 系統連系インバータ装置 |
Publications (1)
Publication Number | Publication Date |
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WO2007110913A1 true WO2007110913A1 (ja) | 2007-10-04 |
Family
ID=38540853
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2006/306168 WO2007110913A1 (ja) | 2006-03-27 | 2006-03-27 | 系統連系インバータ装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7839665B2 (ja) |
EP (1) | EP1887672A4 (ja) |
JP (1) | JP4890247B2 (ja) |
WO (1) | WO2007110913A1 (ja) |
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KR20180099161A (ko) * | 2017-02-28 | 2018-09-05 | 주식회사 엘지화학 | 과전류 유입 방지시스템 |
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JP2014147203A (ja) * | 2013-01-29 | 2014-08-14 | Noritz Corp | パワーコンディショナ |
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KR102253782B1 (ko) | 2017-02-28 | 2021-05-20 | 주식회사 엘지화학 | 과전류 유입 방지시스템 |
JP7319179B2 (ja) | 2019-11-27 | 2023-08-01 | ニチコン株式会社 | パワーコンディショナに接続して使用される蓄電ユニット |
Also Published As
Publication number | Publication date |
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JP4890247B2 (ja) | 2012-03-07 |
EP1887672A1 (en) | 2008-02-13 |
JPWO2007110913A1 (ja) | 2009-08-06 |
US20080304298A1 (en) | 2008-12-11 |
EP1887672A4 (en) | 2009-03-18 |
US7839665B2 (en) | 2010-11-23 |
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