基于三次谐波电流注入的AAMC电容电压均衡策略

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摘要介绍了新型桥臂交替导通多电平换流器(AAMC) 的拓扑结构和基本原理。该拓扑包括两个关键部分, 即由绝缘栅双极型晶体管串联组成的导通开关和全桥子模块级联而成的整形电路。拓扑结构具有模块数量少、无环流、可处理直流故障等优点, 但电容电压平衡是其亟待解决的难点之一。为解决该问题, 提出了采用三次谐波电流注入以实现电容电压均衡的具体策略。具体实现过程分为两步:首先, 通过换流变压器阀侧中性点和直流侧分裂电容构成能量回馈通路, 然后设计了开环控制器控制三次谐波电流大小来保证整形电路总体能量变化均衡;其次, 利用改进载波移相调制方法, 对整形电路内部子模块进行能量再分配, 该方法根据调制波与参考波比较得到需要投入模块的数量, 并基于电流和模块电压监测结果触发相应的子模块。在PSCAD/ EMTDC平台上建立了每桥臂10个子模块的AAMC模型, 仿真结果验证本文所提电容电压均衡策略的有效性。

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	薛英林
	徐政
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关键词 ：桥臂交替导通换流器, 三次谐波电流注入, 能量平衡, 改进载波移相调制, 子模块电容电压均衡控制

Abstract：The topology and operation mechanism of a new alternate-arm multilevel converter (AAMC) are described. This topology has two key parts, i.e., director switches made of insulated gate bipolar transistors(IGBTs) in series and wave shaping circuits containing stacks of full bridge sub-modules(SMs). It offers some attractive features such as small amount of SMs, without circulating current, and DC blocking capacity, etc. However, voltage balancing among the SM capacitors is one of crucial problems in the AAMC. To solve it, a voltage balancing strategy based on third harmonic injection is proposed in this paper. The specific process is devided into two steps. Frstly, an energy feedback path is created between the star-point of the converter transformer and the mid-point of the DC-link spilt capacitors; then, an open-loop controller is designed to control the injection current to make sure the whole energy of the wave shaping circuits keep balance. Secondly, a modified phase-shifted carrier-based PWM is poposed to redistribute the energy within SMs. In this method, the switching amount is calculated according to the modulation wave and reference wave, and then the trigger pulses for specified modules are generated based on the polarity of the arm current and the sort results of capacitor voltages. The model of the AAMC with 10 SMs per arm is realized by PSCAD/EMTDC, and simulation results verify the effectiveness of the proposed strategy.

Key words： Alternate-arm multilevel converter third harmonic current injection energy balancing modified phase-shifted carrier-based PWM sub-module capacitor voltage balancing control

收稿日期: 2012-01-12 出版日期: 2014-03-25

PACS:

TM721.1

基金资助:国家高技术研究发展计划(863计划)资助项目(2012AA050205)

作者简介: 薛英林男, 1986年生, 博士研究生, 研究方向为直流输电与柔性交流输电。徐政男, 1962年生, 博士, 教授, 博士生导师, 研究方向为大规模交直流电力系统分析、直流输电与柔性交流输电、新能源并网。

引用本文:

薛英林, 徐政, 王峰. 基于三次谐波电流注入的AAMC电容电压均衡策略[J]. 电工技术学报, 2013, 28(9): 104-111. Xue Yinglin, Xu Zheng, Wang Feng. Capacitor Voltage Balancing Strategy Base on Third Harmonic Current Injection for the Alternate-Arm Multilevel Converter. Transactions of China Electrotechnical Society, 2013, 28(9): 104-111.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2013/V28/I9/104

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