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Series IGBT voltage-sharing method and system based on auxiliary voltage source

An auxiliary voltage and voltage technology, which is applied in the direction of electronic switches, electrical components, output power conversion devices, etc., can solve the problems of reducing the service life of IGBT, single IGBT overvoltage, affecting the safety and stability of the system, etc., to prolong the shutdown time, Achieve the effect of small difficulty and simple principle

Active Publication Date: 2019-10-18
WUHAN UNIV
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Problems solved by technology

Uneven voltage distribution may cause a single IGBT to generate overvoltage, which may reduce the service life of the IGBT, or directly cause damage to the IGBT, thereby affecting the safety and stability of the entire system

Method used

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  • Series IGBT voltage-sharing method and system based on auxiliary voltage source
  • Series IGBT voltage-sharing method and system based on auxiliary voltage source
  • Series IGBT voltage-sharing method and system based on auxiliary voltage source

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] In the embodiment of the present invention, the method for equalizing the voltage of series IGBTs based on the auxiliary voltage source includes the following steps:

[0036] (1) Detect the dynamic voltage of each port of the series IGBT;

[0037] (2) Carry out IGBT dynamic overvoltage diagnosis;

[0038] (3) If there is a dynamic overvoltage, a high level signal is provided to the gate of the IGBT;

[0039] (4) Provide a constant voltage at the gate of the IGBT.

[0040] In the step (1), the specific method for detecting the dynamic voltage of each port of the series IGBT is to input the...

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Abstract

The invention discloses a series IGBT voltage-sharing method and system based on an auxiliary voltage source. The method comprises the following steps: (1) detecting a port dynamic voltage of each series IGBT; (2) performing dynamic overvoltage diagnosis on the port dynamic voltage of each IGBT; (3) if a dynamic overvoltage exists, providing an emergency high-level signal for the gate of the IGBT;and (4) stopping providing the high-level signal for the gate of the IGBT, and providing a constant voltage for the gate of the IGBT through the auxiliary voltage source. The constant voltage is provided by the auxiliary voltage source, so that the turn-off time of the fault IGBT is prolonged; and the IGBT is turned off synchronously with other IGBTs, so that the purpose of voltage sharing of theseries IGBTs is achieved.

Description

technical field [0001] The invention relates to the field of DC power transmission, in particular to a voltage equalization method and system for series IGBTs based on an auxiliary voltage source. Background technique [0002] With the continuous development of my country's economy, in the field of power transmission and distribution, DC transmission technology has been widely used in renewable energy grid integration, distributed generation grid integration, island power supply, urban grid power supply, and asynchronous AC grid interconnection. However, as the key equipment of DC transmission technology, the busbar voltage of the voltage source converter is large, so higher requirements are put forward for the insulation and withstand voltage of the power equipment. At present, the series technology of IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) can effectively solve the defect of low voltage level of a single IGBT, has low cost and simple st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/088
CPCH02M1/088G01R31/261H03K17/0828H03K17/107H03K17/18H03K17/08126H03K17/22H03K17/567H03K2017/226
Inventor 何怡刚李猎何鎏璐王晨苑
Owner WUHAN UNIV
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