Circulation-free three-phase double-Buck full-bridge inverter and control strategy thereof

Abstract

The invention discloses a circulation-free three-phase double-Buck full-bridge inverter and a control strategy thereof, and belongs to the technical field of power electronic converters. The inverteris composed of two DC input voltage sources (VH, VL), twelve switching tubes (Sa1-Sa4, Sb1-Sb4, and Sc1-Sc4), eight diodes (Da1, Da2, Db1, Db2, Dc1, Dc2, DP and DN), six filter inductors (La, Lb, Lc,Lfa, Lfb and Lfc) and three alternating-current loads (Za, Zb and Zc). According to the invention, only by use of one inverter, it is achieved that two independent direct-current input sources supplypower for the alternating-current loads, and the functions of the two single-input inverters are achieved. The circulating-current-free three-phase double-Buck full-bridge inverter provided by the invention is free of bridge arm straight-through and switching tube body diode reverse recovery problems, and can work in a fixed-frequency circulation-free mode under a proposed control strategy, so that the reliability and the efficiency are high. The inverter and the control strategy are suitable for high-efficiency and high-reliability power supply application occasions such as new energy power generation and aviation airborne power supplies.

Description

technical field [0001] The invention relates to a three-phase dual-Buck full-bridge inverter with no circulation and a control strategy thereof, belonging to the technical field of power electronics, in particular to the technical field of DC-AC power conversion. Background technique [0002] With the development of more electric aircraft and new energy technologies, the requirements for the reliability, efficiency and power density of inverters are getting higher and higher. [0003] The bridge arm of the traditional bridge inverter consists of two switch tubes connected in series, and there is a risk of shoot-through. Therefore, a dead zone needs to be added between the two switching tubes. However, after the dead zone is added, the serious reverse recovery caused by the freewheeling of the body diode of the switch not only lowers the efficiency of the inverter, but also causes a serious threat to the reliable operation of the inverter. To this end, scholars have propose...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a three-phase dual-Buck full-bridge inverter without circulating current and its control strategy, which are used to solve the problem of low utilization rate of filter inductance and circulating current in the existing three-phase dual-input dual-Buck inverter. question

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