Method for controlling voltage of direct current capacitors in double-output and three-switch-set MMC inverter

A technology of DC capacitor and three-switch group, which is applied to the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc. , to achieve the effect of solving the pressure equalization problem

Active Publication Date: 2014-07-30
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current control method of the DC capacitor of the MMC converter is not suitable for the dual-output single-phase three-switch group MMC inverter

Method used

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  • Method for controlling voltage of direct current capacitors in double-output and three-switch-set MMC inverter
  • Method for controlling voltage of direct current capacitors in double-output and three-switch-set MMC inverter
  • Method for controlling voltage of direct current capacitors in double-output and three-switch-set MMC inverter

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Embodiment Construction

[0016] In order to further illustrate the content and characteristics of the present invention, the specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, but the implementation of the present invention is not limited thereto.

[0017] refer to figure 1 , dual-output single-phase three-switch group MMC inverter, including DC power supply U dc , the first capacitor C 1 , the second capacitor C 2 , the third capacitor C 3 , a switch bridge arm, a first load and a second load; the switch bridge arm consists of an upper switch group H, a middle switch group M, a lower switch group L and a coupled inductance ( L H :L L ) in series; the upper switch group H consists of N power switch units (SM H1 , SM H2 ,...,SM HN ) in series, and the middle switch group M consists of N power switch units (SM M1 , SM M2 ,...,SM MN ) in series, and the lower switch group L consists of N power switch units (SM L1 , SM L2 ...

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Abstract

The invention provides a method for controlling voltage of direct current capacitors in a double-output and three-switch-set MMC inverter. The method comprises the step of controlling the voltage of the direct current capacitors of power switch units of the upper switch set, the middle switch set and the lower switch set, and the step of sampling the voltage of the direct current capacitors of the power switch units of the upper switch set, the middle switch set and the lower switch set and stabilizing the voltage of the direct current capacitors of the power switch units through voltage feedback and PI adjustment. According to the method, the voltage of the direct current capacitors in the double-output, one-phase and three-switch-set MMC inverter is balanced and stabilized, the double-output, one-phase and three-switch-set MMC inverter can have two paths of N+1 electrical level alternating current output, the quality of the output current waveform is very high, the voltage stress borne by each switch tube in the power switch units is only 1/N of the direct current bus voltage, the voltages borne by all the switch tubes are equal in the working process of a converter, and the voltage-sharing problem of the switch tubes is solved very well.

Description

technical field [0001] The invention relates to the field of control of DC capacitor voltage of a module combined multilevel (MMC) converter, in particular to a method for controlling DC capacitor voltage of a dual-output three-switch group MMC inverter. Background technique [0002] The dual-output single-phase three-switch group MMC inverter has two N+1 level AC outputs, the output current waveform quality is very high, and the voltage stress of each switching tube in the power switch unit is only 1 / N of the DC bus voltage , and at the same time, it can ensure that all the switching tubes bear the same voltage during the working process of the converter, which solves the voltage equalization problem of the switching tubes well. Compared with the existing single-phase three-switch converter, the two outputs of the dual-output single-phase three-switch group MMC inverter provided by the present invention are both N+1 level AC outputs, and the quality of the output AC wavefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/501H02M7/537
CPCH02M7/487H02M7/4835H02M1/0095
Inventor 张波付坚丘东元
Owner SOUTH CHINA UNIV OF TECH
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