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Three-phase four-track bridge protection circuit for current output type inverter

A protection circuit, three-phase four-wire technology, applied to output power conversion devices, electrical components, etc., can solve problems such as device damage, high DC side voltage, and misoperation of switching devices, so as to prevent false triggering and reduce impact peaks The effect of electric current and simple structure

Active Publication Date: 2012-11-28
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] due to figure 1 The DC side voltage in the circuit is very high [Zhao Guopeng, Liu Jinjun. Research on the influence of static var generator DC side voltage on reactive power compensation characteristics [J]. Journal of Xi'an Jiaotong University, 2010, 44(4): 66-70.] , when this kind of through phenomenon occurs, the inrush current will reach a large value, resulting in a large di / dt and du / dt, which will easily cause the malfunction of the switching device and cause the device to be damaged

Method used

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  • Three-phase four-track bridge protection circuit for current output type inverter
  • Three-phase four-track bridge protection circuit for current output type inverter
  • Three-phase four-track bridge protection circuit for current output type inverter

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] exist figure 1 In the shown three-phase four-wire switching circuit, each phase can independently control its switching process and output current. The topology of the IGBT bridge arm protection circuit proposed by the present invention is as follows: image 3 shown.

[0026] The LCRD (composed of inductance, capacitor, resistor and diode) bridge arm protection circuit is connected in parallel on the original IGBT bridge arm, and the inductance L is much smaller than the inductance L in value. 1 , the capacitance C is much smaller than the capacitance C 1 and C 2 , the value of the resistor R needs to make U / R less than the maximum allowable reverse recovery current of the IGBT diode.

[0027] If the original current is Q 2 Turn-on current flows through Q 2 ,D 3 remains off, Q 2 The voltage on is zero. When Q 2 In shutdown, the current ...

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Abstract

The invention relates to a three-phase four-track bridge protection circuit for a current output type inverter, which can effectively reduce impact peak current, di / dt and du / dt in a switching process of a power device and prevent false triggering of a switching device to effectively protect the power device. Each phase is provided with an insulated gate bipolar translator (IGBT) bridge arm protection circuit with the same structure, wherein the circuit comprises a pair of IGBT switch tubes Q1 and Q2; each IGBT switch tube Q1 or Q2 is reversely connected with a diode D1 or D2 in parallel; theinput end of the bridge arm is connected with an inductor L1; meanwhile, the output end of the bridge arm is connected with serially connected diode D3 and capacitor C and serially connected inductorL, capacitor C1 and capacitor C2 in parallel respectively; and an anode of the diode D3 is connected with one end of the capacitor C1 through a resistor R.

Description

technical field [0001] The invention relates to a three-phase four-wire bridge protection circuit for a current output type inverter. Background technique [0002] The main difference between the current output type inverter and the general voltage source type inverter is that the working voltage of the DC side is particularly high, and the output of the inverter bridge is connected to the AC voltage source through the inductor. Typical current output inverters include active power filters, static var generators, and photovoltaic inverters. In order to ensure good tracking characteristics of the output current, the operating voltage should be at least twice the peak value of the AC phase voltage (Zhao Guopeng , Liu Jinjun. Research on the influence of static var generator DC side voltage on reactive power compensation characteristics [J]. Journal of Xi'an Jiaotong University, 2010, 44(4): 66-70.). When there is no protection circuit, when the upper and lower arms of the inv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32
Inventor 程艳慕世友毛庆波赵鹏龚宇雷段玉兵李庆民
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY