Fast Voltage Recovery Control Strategy for Supercapacitor Interfacing Bidirectional DC-DC Converter
Liu Sucheng1,2, Gan Yangyang1,2, Liu Xiaodong1,2, Liu Yanfei3
1. School of Electrical and Information Engineering Anhui University of Technology Maanshan 243032 China; 2. Key Lab of Power Electronics & Motion Control Anhui University of Technology Maanshan 243032 China; 3. Department of Electrical and Computer Engineering Queen’s University Kingston K7L3N6 Canada;
Abstract：Control of bus voltage stability in DC microgrid is a key issue, which is particularly important when the DC bus is disturbed at different time scales. In order to solve the problem of instantaneous power imbalance of the DC bus, the idea of capacitor charge balance control (CBC) was introduced to supercapacitor interfacing bidirectional DC-DC converter to realize fast recovery of bus voltage with high power density of the supercapacitor. Based on existing CBC for unidirectional current DC-DC converter, the idea of indirectly predicting the change of capacitor current was extended and optimized. Moreover, the general substitution method of node current was obtained and the corresponding control law was also derived to achieve the objective of fast control of bidirectional current. The detailed implementation of the hybrid control strategy based on CBC was given, and the average current mode control combined with hysteresis current limiter were used to realize stable control of the interfacing converter at both sides. Finally, simulation and prototype experiments verify the effectiveness of the proposed hybrid control strategy.
刘宿城, 甘洋洋, 刘晓东, 刘雁飞. 超级电容接口双向DC-DC变换器的电压快恢复控制策略[J]. 电工技术学报, 2018, 33(23): 5496-5508.
Liu Sucheng, Gan Yangyang, Liu Xiaodong, Liu Yanfei. Fast Voltage Recovery Control Strategy for Supercapacitor Interfacing Bidirectional DC-DC Converter. Transactions of China Electrotechnical Society, 2018, 33(23): 5496-5508.
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2018, Vol. 33 
