模块化多电平变换器预充电控制策略

姚骏; 谭义; 赵磊; YAO Jun; TAN Yi; ZHAO Lei

doi:10.16513/j.cnki.10-1427/tk.2016.01.007

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分布式能源 ›› 2016, Vol. 1 ›› Issue (1) : 33-39. DOI: 10.16513/j.cnki.10-1427/tk.2016.01.007

学术研究

模块化多电平变换器预充电控制策略

姚骏 ¹ ,
谭义 ¹ ,
赵磊 ² ,
YAO Jun ¹ ,
TAN Yi ¹ ,
ZHAO Lei ²

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Pre-Charging Control Strategy for Modular Multilevel Converter

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摘要

The pre-charging process of modular multilevel converter (MMC) could be divided into uncontrolled pre-charging process and controlled pre-charging process. By comparing the uncontrolled pre-charging process with the uncontrolled rectifying process of 3-phase full bridge, the increase process of sub-module capacitor voltage was fully analyzed. Furthermore, a simple and effective unlock control strategy was proposed for the controlled charging process. The proposed strategy could quickly charge all the sub-module capacitors to the voltage required for the steady state operation of MMC. With the proposed unlock strategy, no indicated pre-charging controller was required, and the voltage fluctuation of sub-module capacitor could be significantly reduced when the converter switching to the normal operation after pre-charging. The decrease of the voltage fluctuation could effectively reduce the voltage impact of the capacitors and thus extend the lifespan of the sub-module capacitors. Finally, a detailed simulation model of a double terminal MMC was built on PSCAD/EMTDC to verify the effectiveness of the developed control strategy.

关键词

模块化多电平变换器(MMC) / 预充电 / 解锁控制 / 电容电压波动 / modular multilevel converter(MMC) / pre-charging / unlock control / capacitor voltage fluctuation

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姚骏, 谭义, 赵磊, 等. Pre-Charging Control Strategy for Modular Multilevel Converter[J]. 分布式能源. 2016, 1(1): 33-39 https://doi.org/10.16513/j.cnki.10-1427/tk.2016.01.007

[J]. Distributed Energy Resources. 2016, 1(1): 33-39 https://doi.org/10.16513/j.cnki.10-1427/tk.2016.01.007

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