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Simple starting method for clamp double sub-module modular multilevel converter

A modular multi-level, clamping twin-module technology, applied in electrical components, output power conversion devices, etc., can solve the problem of module capacitor voltage overcharge and other issues

Active Publication Date: 2015-06-24
XJ ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the risk of overcharging the module capacitor voltage

Method used

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  • Simple starting method for clamp double sub-module modular multilevel converter
  • Simple starting method for clamp double sub-module modular multilevel converter
  • Simple starting method for clamp double sub-module modular multilevel converter

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] Clamped twin sub-module topologies such as figure 2 As shown, it consists of two half-bridge sub-module units connected through two clamping diodes and a leading IGBT (To).

[0034] Each half-bridge sub-module unit has 3 switch states, input state (T11 on, T12 off; T21 on, T22 off), cut-out state* (T11 off, T12 on; T21 off, T22 on), blocking state ( Both tubes are off); the guide IGBT is divided into two states of on and off. The above "cutting" refers to controlling the output voltage of the sub-module or half-bridge sub-module unit to zero, that is, to achieve the effect that the module capacitor does not participate in charging; because when the IGBT is turned off and the bridge arm current is negative, the half-bridge sub-module When the module unit is in the cut-out state, it cannot produce a cutting effect, so the state where T11 is off and T1...

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Abstract

The invention relates to a simple starting method for a clamp double sub-module modular multilevel converter. The starting process is divided into three phases which comprises the first phase of uncontrolled rectifying charging, the second phase of conducting leading IGBT to conduct charging continuously, and the third phase of unlocking and completing charging through a direct voltage closed-loop controller. Compared with an existing method, the simple starting method for the clamp double sub-module modular multilevel converter is more suitable for engineering application, a soft-start resistor does not need not to be used for long time, and the danger that module capacitor voltage is overcharged is eliminated.

Description

technical field [0001] The invention relates to a simple start-up method for a modularized multilevel converter of clamped twin sub-modules. Background technique [0002] With the development of fully-controlled power electronic devices and the application of power electronic technology in power systems, the flexible DC transmission technology based on voltage source converters has been paid more and more attention. Modular multilevel converter (MMC) is a kind of voltage source converter in the application of flexible DC transmission system. It is composed of multiple sub-modules connected in a certain way. By controlling each sub-module The switch-on and switch-off states of the IGBT components make the AC voltage output by the converter approach to a sine wave, realizing efficient energy transmission. [0003] A modular multilevel converter (C-MMC) composed of clamp double sub-modules (Clamp Double Sub-Module) is proposed, such as figure 1 As shown, it can quickly comple...

Claims

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Application Information

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IPC IPC(8): H02M1/36
CPCH02M1/36
Inventor 张建张浩吴金龙杨美娟刘欣和王先为李道洋
Owner XJ ELECTRIC