An Interleaved Dual-Buck Full-Bridge Type Bidirectional Grid-Connected Inverter
Wang Yifeng1, Cui Yulu1, Ma Xiaoyong1, Meng Zhun2, Ji Ruilin3
1. School of Electrical and Information Engineering Tianjin University Tianjin 300072 China; 2. State Grid Tianjin Economic Research Institute Tianjin 300171 China; 3. State Grid Tianjin Power Costumer Service Center Tianjin 300210 China
Abstract：Based on the double-buck full-bridge converter topology, this paper proposes an interleaved parallel bidirectional grid-connected inverter. The proposed inverter can overcome the dead time of the traditional H-bridge inverter, greatly increase the switching frequency, and avoid the straight-through danger of bridge arm. In order to increasing the frequency and power density while ensuring the efficiency of the converter, a 2-channel interleaved parallel structure is adopted. Under the same output inductor current ripple, only a small amount of inductance is needed, and the current stress and loss of the high frequency switch tube can also be reduced. In this paper, the working principle and characteristics of the inverter and rectification modes of the converter are analyzed. At the same time, with the minimum inductance as the goal, the filter design requirements of different modes are comprehensively considered, and the Buck inductor and filter parameters were optimized using graphical methods. The parameters of the device are optimized. On this basis, the loss analysis model is constructed, and the loss distribution in the inverter and rectifier states is calculated and analyzed. Finally, this paper builds a 5kW experimental prototype, which verifies the above theoretical analysis and calculation. The efficiency of the inverter is higher than 98% from 20% to full load.
王议锋, 崔玉璐, 马小勇, 孟准, 冀睿琳. 一种交错并联双Buck全桥型双向并网逆变器[J]. 电工技术学报, 2019, 34(21): 4529-4539.
Wang Yifeng, Cui Yulu, Ma Xiaoyong, Meng Zhun, Ji Ruilin. An Interleaved Dual-Buck Full-Bridge Type Bidirectional Grid-Connected Inverter. Transactions of China Electrotechnical Society, 2019, 34(21): 4529-4539.
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2019, Vol. 34 
