To address the issues of repeated module switching and significant voltage fluctuations in the capacitor voltage balan-cing control strategy of MMC submodules in ultra-high voltage flexible DC converter stations,this paper investigates the opera-tion of fractional-order supercapacitors,with a focus on both the transmission and non-transmission power of the converter.A mathematical model of the MMC submodule was established based on the study of capacitor voltage below and above the refer-ence waveform voltage.A dual closed-loop control strategy for capacitor voltage was proposed.The effectiveness and feasibility of this method in voltage balancing control of submodules in ultra-high voltage flexible DC converter stations were verified by constructing a simulation model using Simulink.
关键词
特高压/柔性直流换流站/分数阶超级电容/MMC子模块/电压均衡控制
Key words
ultra-high voltage/flexible DC converter stations/fractional order supercapacitors/MMC submodule/voltage balan-cing control
维普
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