一种减少电压互感器的模块化多电平换流器分组控制策略

发布时间：2018-06-20 16:48

本文选题：模块化多电平换流器 + 子模块分组控制　；参考：《电工技术学报》2017年18期

【摘要】：针对模块化多电平换流器(MMC)需要配置大量电压互感器的问题,提出一种减少电压互感器的分组控制策略。该控制策略将每个桥臂的2N个子模块按照2~0,2~1,2~2,…,2~(N-1),2~0分成N+1个子模块组。将每组的子模块作为一个整体,开关状态保持一致,并且配备一个电压互感器,用于测量每组的电容电压。根据这种结构设计相应的电容电压平衡控制方法、均压控制方法和调制方法。电容电压平衡控制采用PI调节器稳定各组子模块的电容电压;均压控制用来保持组间子模块电压平均值均衡;调制方法用来确定各个模块组的通断状态。该分组方法极大地减少了电压互感器的数量,降低MMC系统的造价。最后通过在Matlab/Simulink平台上搭建三十三电平的三相MMC仿真模型进行证明,并搭建九电平单相MMC实验平台,进行实验验证,结果表明了该分组控制策略的有效性。
[Abstract]:In order to solve the problem that a large number of voltage transformers need to be deployed in the modularized multilevel converter (MMC), a grouping control strategy for reducing voltage transformers is proposed. In this control strategy, the 2N submodule of each arm of the bridge is divided into two submodules. The N-1 and N-0 were divided into N 1 submodule group (n 1 submodule group) and N 1 submodule group (P < 0 01). Each group of sub-modules as a whole, the switching state is consistent, and is equipped with a voltage transformer to measure the capacitance voltage of each group. According to this structure, the corresponding capacitive voltage balance control method, voltage sharing control method and modulation method are designed. The capacitor voltage balance control uses Pi regulator to stabilize the capacitor voltage of each submodule; the voltage equalization control is used to keep the average voltage equalization between the sub-modules; and the modulation method is used to determine the on-off state of each module group. This grouping method greatly reduces the number of voltage transformers and reduces the cost of MMC system. Finally, a three-phase MMC simulation model with 33 level is built on Matlab / Simulink platform, and a nine-level single-phase MMC experimental platform is built for experimental verification. The results show the effectiveness of the grouping control strategy.
【作者单位】：湖南大学国家电能变换与控制工程技术研究中心;
【基金】：湖南省重点研发计划资助项目(2015GK3012)
【分类号】：TM46

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