具有极性反转逆变桥的隔离Buck-Boost型逆变器

Isolated Buck-Boost Inverter with Polar Inverter Bridge

文中提出了具有极性反转逆变桥的隔离Buck-Boost型逆变器,并对这种逆变器的电路拓扑、小信号模型、系统控制策略等内容进行了深入的理论分析,获得了重要结论。该电路拓扑是由双向隔离Buck-Boost直流变换器和极性反转逆变桥级联构成,具有前馈、PI和重复控制相结合的复合控制策略有效地提高了输出波形质量。设计并研制的500 VA110 VDC/220 V50 HzAC逆变器样机,具有成本低、准单级功率变换、输出波形质量高、带载能力强、变换效率高和可靠性高等优良性能。

This paper presented an isolated Buck-Boost inverter with polar inversion bridge.The circuit topology,small-signal model and system control strategy of the inverter were analyzed in depth,and important conclusions are obtained.The circuit topology is composed of a bidirectionally isolated Buck-Boost DC converter and a polarity inversion bridge cascade.The combined control strategy of feedforward,PI and repetitive control effectively improves the output waveform quality.The prototype of 500 VA110 VDC/220 V50 Hz AC inverters designed and developed has the advantages of low cost,quasi-single-stage power conversion,high output waveform quality,strong load capacity,high conversion efficiency and high reliability.