【摘要】 提出准单级单向Buck直流变换器型高频链并网逆变器电路结构与拓扑族。其电路结构是由单向隔离Buck直流变换器和极性反转逆变桥级联构成;其拓扑族包括推挽正激式、双管正激式、并联交错双管正激式、半桥式和全桥式电路。深入分析研究类逆变器的电路拓扑、电流瞬时值控制策略、稳态原理特性和关键电路参数设计准则。以推挽正激式拓扑为例,设计并研制出1kW48VDC/220V50HzAC并网逆变器样机。研究结果表明,此类逆变器具有高频电气隔离、电路结构简洁、准单级功率变换、变换效率高、极性反转逆变桥功率开关电压应力低且为ZVZCS、并网电流质量高等优点。更多还原

【Abstract】 A circuit configuration and circuit topological family of quasi single-stage unidirectional buck dc-dc converter mode grid-connected inverters with high frequency link are proposed in this paper.Its circuit configuration is composed of the unidirectional isolated buck dc-dc converter and polarity reversal inverting bridge,and its circuit topology includes single-transistor forward,interleaving single-transistor forward,push-pull,push-pull forward,two-transistor forward,interleaving two-transistor forward,half-bridge,and full-bridge mode circuit.The circuit topology,instantaneous current control strategy,steady principle properties,and design criteria for the key circuit parameters were deeply investigated.Taking push-pull forward mode topology as an example,1 kW 48VDC/220V50 HzAC grid-connected inverter prototype was developed.The research results show that this kind of inverter has the advantages such as high frequency electrical isolation,simple topology,quasi single-stage conversion,high conversion efficiency,the polarity reversal inverting bridge’s power switches having low voltage stress and ZVZCS,high quality grid-connected current etc.更多还原