Design of additional DC voltage control strategy for modular multilevel converter

被引：0
作者：
Li, Haifeng [1 ]
Liu, Chongru [1 ]
Li, Gengyin [1 ]
Hong, Guowei [1 ]
机构：
[1] State Key Laboratory for Alternate Electrical Power System With Renewable Energy Sources, North China Electric Power University, Changping District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2015年 / 39卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Additional DC; Loss of voltage level; MMC; Modulation index; voltage control;
D O I：
10.13335/j.1000-3673.pst.2015.07.003
中图分类号：
学科分类号：
摘要：
An additional DC voltage control strategy is proposed to ensure the modulation index of a modular multi-level converter within a proper range and guarantee the converter to operate in steady state. With the proposed control strategy, the AC stepwise waveform generated by the converter could keep full voltage levels. Firstly, through analyzing the theory of sinusoidal pulse width modulation, the minimum and maximum limits of the modulation index is proposed. Secondly, the additional DC voltage controller is designed with a non-linear relationship between the DC voltage and the modulation index. Finally, a two-terminal MMC-HVDC system with 11 voltage levels is used for validating the proposed additional DC voltage control strategy. Simulation results show that the stepwise waveforms of the converter could keep full voltage levels and the MMC-HVDC system is able to reach a new steady state when operation point of the system changes. The proposed control strategy is proved effective and flexible. ©, 2015, Power System Technology Press. All right reserved.
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页码：1779 / 1785
页数：6
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