| 引用本文: | 林环城,王志新.MMC功率运行区域分析及环流切换控制策略[J].电力自动化设备,2018,(8): |
| LIN Huancheng,WANG Zhixin.Power operating region analysis and circulating current switching control strategy for MMC[J].Electric Power Automation Equipment,2018,(8): |
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| 摘要: |
| 通过对模块化多电平换流器(MMC)动态特性和控制机理的分析，提出基于系统容量、电容电压波动阈值以及最大瞬时调制比的功率运行区域确定方法，并通过该方法对环流抑制和环流注入控制策略在不同子模块电容配置下的功率运行区域进行了比较分析。该方法可以优化子模块电容参数选取，避免过度冗余设计。此外，提出基于电压预测的环流控制器，使在不同工作点下可根据分析结果直接进行最优环流控制模式切换。对某单一桥臂子模块数为20的MMC系统进行仿真研究，结果验证了所提功率运行区域分析方法及其环流切换控制策略的正确性和有效性。 |
| 关键词: 模块化多电平换流器 环流控制 功率运行区域 电容均压 |
| DOI：10.16081/j.issn.1006-6047.2018.08.005 |
| 分类号:TM46 |
| 基金项目:国家自然科学基金资助项目(51377105) |
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| Power operating region analysis and circulating current switching control strategy for MMC |
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LIN Huancheng, WANG Zhixin
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School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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| Abstract: |
| Based on analyzing the dynamic characteristics and control mechanism of MMC(Modular Multilevel Converter),a method to determine the power operating region is proposed according to the system capacity, maximum capacitor voltage ripple and maximum instantaneous modulation ratio. Based on the proposed method, the power operating regions with circulating current elimination and circulating current injection strategies are compared under different sub-module capacitors. The proposed method can optimize the selection of sub-module capacitor parameters to avoid excessive redundancy. Furthermore, a voltage-prediction based circulating current controller is proposed to realize the optimal switching between different control modes at different operating points. The validity and effectiveness of the proposed power operating region analysis method and circulating current swithching control strategy are verified by the simulation study of a MMC system with 20 sub-modules per arm. |
| Key words: modular multilevel converter circulating current control power operating region capacitor voltage balancing |
