Abstract：The existing topologies of solid-state transformer (SST) for distribution network require a large number of capacitors, modules, IGBTs and high-frequency (or medium-frequency) transformers, which leads to high cost but low power density. In this paper, a high power density resonance cascaded H-bridge (full-bridge) SST (RCHB-SST) for medium/high-voltage distribution network is proposed. Taken the advantage of frequency selection function of series resonance, RCHB-SST can achieve a special structure with one high-frequency transformer corresponding to several H-bridge modules. Compared with traditional SST topologies, it can enhance power density with fewer capacitors, modules, IGBTs and high-frequency transformers. Furthermore, fewer modules and the adoption of open-loop control in the DC-DC stage will simplify the control system. In this paper, the function principle of RCHB-SST is analyzed, the mathematical model of RCHB-SST is established, and the control strategies and the calculation method of module capacitance are proposed. Finally, simulation verification is carried out.
张雪垠, 徐永海, 肖湘宁. 适用于中高压配电网的高功率密度谐振型级联H桥固态变压器[J]. 电工技术学报, 2018, 33(2): 310-321.
Zhang Xueyin, Xu Yonghai, Xiao Xiangning. A High Power Density Resonance Cascaded H-Bridge Solid-State Transformer for Medium and High Voltage Distribution Network. Transactions of China Electrotechnical Society, 2018, 33(2): 310-321.
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