单相电流型多电平变流器自均流特性

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摘要单相电流型多电平变流器拓扑一般都利用分流电感产生各级中间电平电流, 为使各级中间电平电流保持平衡, 必须研究电流型多电平变流器的均流特性。根据分流电感的连接方式, 以一类最简单的单相电流型多电平变流器拓扑为例, 通过建立其分流电感电压平均值的数学表达式, 从理论上对该类变流器的自均流特性进行了详细分析, 仿真实验获得了与理论分析相一致的结论。为改善不同负载特性下输出电流的谐波特性, 提出了一种基于直流侧电流反馈、自动选择冗余开关组合的均流控制方法, 实验结果验证了控制方法的正确性与有效性。

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	鲍建宇
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关键词 ：多电平, 电流型变流器, 拓扑, 自均流, 谐波, 冗余开关组合

Abstract：The sharing-inductors are used to generate the different current-levels for the single-phase multilevel current-source inverter (MCSI). To keep the intermediate DC-link currents balanced, it is necessary to study the current-balancing characteristics of MCSI. In this paper, according to the connection modes of the sharing-inductors, a kind of single-phase MCSI which has simple circuit structures is introduced. By setting up mathematical expressions of the average-voltage across the sharing-inductors, the natural current-balancing performances of such MCSI are analyzed in detail, and the simulation results are in complete agreement with the theoretical conclusions. In order to improve the harmonic performances of output current at different load conditions, a practicable way to balance the intermediate DC-link current is proposed, which was implemented with automatically choosing the redundant switching-combinations based on the DC-link current feedback. Lastly, the correctness and validity of such control method are verified by the experimental results.

Key words： Multilevel current-source inverter (CSI) topology natural current-balancing harmonics redundant switching-combinations

收稿日期: 2009-01-15 出版日期: 2014-03-04

PACS:

TM464

基金资助:宁波市择优委托工业资助项目(2008B10020)

作者简介: 鲍建宇男, 1976年生, 博士, 讲师, 研究方向为电流型多电平变流器的控制、永磁电机变频驱动技术、开关电源控制芯片的计算机建模等。鲍卫兵女, 1966年生, 硕士, 讲师, 研究方向为工业自动化应用技术、电力线载波通信、自动抄表技术等。

引用本文:

鲍建宇, 鲍卫兵, 张仲超. 单相电流型多电平变流器自均流特性[J]. 电工技术学报, 2010, 25(4): 89-94. Bao Jianyu, Bao Weibing, Zhang Zhongchao. Natural Current-Balancing Performance of a Kind of Single-Phase Multi-Level Current-Source Inverter. Transactions of China Electrotechnical Society, 2010, 25(4): 89-94.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2010/V25/I4/89

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