Abstract：The hybrid modular DC solid state transformer (HMDCSST), based on the phase shift-dual active bridge (PS-DAB) converter and the series resonant-dual active bridge (SR-DAB), combines the advantages of PS-DAB in flexible control and SR-DAB in efficient conversion. This paper studies the dynamic characteristics and rapid response control of the HMDCSST. By analyzing the average and small signal models of PS-DAB and SR-DAB respectively, the small signal model of HMDCSST with ISOP structure was established, and the accuracy is proved by simulation. To improve the dynamic response and minimize the interference effect of input voltage and load disturbance on output voltage, a rapid dynamic response control strategy combining input voltage feedforward and load power prediction was presented. The stability analysis of this new control strategy was demonstrated by using the frequency domain Bode curve. Finally, the HMDCSST prototype was built to verify the rapid dynamic response control. Compared with the traditional PI method, the experimental results show the effectiveness and superiority of the proposed control strategy.
付超, 高振, 孙玉巍, 武承杰. 混合模块化直流固态变压器 II：动态特性及快速响应控制[J]. 电工技术学报, 2019, 34(14): 2980-2989.
Fu Chao, Gao Zhen, Sun Yuwei, Wu Chengjie. Hybrid Modular Direct Current Solid State Transformer II: Dynamic Characteristic and Rapid Response Control. Transactions of China Electrotechnical Society, 2019, 34(14): 2980-2989.
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2019, Vol. 34 
