Protection method of modular multi-level current converter

A modular multi-level, inverter technology, applied in the protection of overcurrent response, overvoltage response protection, emergency protection circuit devices, etc., can solve the problem of not finding the reference source, capacitor short circuit discharge, etc. problem, to achieve the effect of improving availability, guaranteeing work reliability, and ensuring normal operation

Active Publication Date: 2012-02-15
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since both IGBTs are in the on state at the same time, it will cause short-circuit discharge of the capacitor in the sub-module, so this state is prohibited
So in fact, there can only be 3 working states of the sub-module, such as error! Reference source not found

Method used

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  • Protection method of modular multi-level current converter
  • Protection method of modular multi-level current converter
  • Protection method of modular multi-level current converter

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Embodiment Construction

[0033] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] Such as image 3 As shown, for the sub-module in MMC, it usually contains the following components: IGBT, thyristor T, DC capacitor C, resistor R, snubber circuit XS, discharge circuit FD, bypass switch K, etc.

[0035] The sub-module controller KZQ is respectively connected with the drive circuits QD1, QD2, QD3 and QD4; QD1 is connected with the bypass switch K; QD2 is connected with the thyristor T; QD3 is connected with the IGBT; QD4 is connected with the discharge circuit FD.

[0036] The sub-module controller KZQ includes a monitoring system MS and drive circuits DQ1, DQ2, DQ3, and DQ4; the sub-module SM includes an isolation switch K, two IGBTs in series, diodes D1, D2 connected in antiparallel to each IGBT, and a series The last two IGBTs are connected in parallel with a resistor R, a capacitor C and a dis...

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Abstract

The invention provides a protection method of a modular multi-level current converter. The current converter comprises a sub-module controller and a sub-module; when the sub-module breaks down, the sub-module controller monitors and acts on the sub-module, so as to remove the failed sub-module timely, and the normal operation of the modular multi-level current converter can be ensured. According to the protection method provided by the invention, the overall current converter is not exited due to the fault of the sub-module, meanwhile, the sub-module is not integrally damaged due to the fault of the components in the sub-module, thereby greatly improving the utilization of the modular multi-level current converter and improving the stability of the system operation.

Description

Technical field: [0001] The invention relates to the field of power electronics, in particular to a protection method for a modular multilevel converter. Background technique: [0002] The basic structure of the modular multi-level converter (MMC) is similar to that of the commonly used three-phase bridge converter, and its basic structure is also composed of six converter bridge arms, but each of them Each bridge arm is composed of multiple submodules (SubModule, SM) in series, such as error! Reference source not found. . Each sub-module mainly includes two switching devices S1 and S2, a DC capacitor C and a bypass switch K. [0003] For a modular multilevel converter, each of the sub-modules contains two IGBT (insulated gate bipolar transistor) devices, and each device has an on (On) and an off (Off) two states, so there should be 4 combinations of switch states in each sub-module. However, since both IGBTs are in the conducting state at the same time, it will cause s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/10H02H3/08H02H3/20
CPCH02M1/325H02M7/4835
Inventor 庞辉贺之渊汤广福易荣栾洪洲吕铮冯静波
Owner CHINA ELECTRIC POWER RES INST
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