中文摘要：

研究了一种基于双Buck逆变电路的微型逆变器及其控制策略,前级DC/DC变换器完成光伏组件输入电压的升压并实现MPPT控制;后级双Buck逆变电路完成入网电流单位功率因数控制并保持直流母线电压的稳定。所述微型逆变器的逆变电路无桥臂直通风险,驱动信号无需加死区;MOSFET体二极管不导通,开关管和续流二极管的选型得到了优化;系统不存在共模电流隐患,可采用无变压器设计;直流母线电容容值低,利用薄膜电容替代了电解电容。仿真结果验证了电路拓扑和控制策略的正确性。

英文摘要：

This paper researched a dual paralleled buck inverting circuit based micro-inverter and its control strategy,where a DC/DC converter,serving as the front-end part,is employed to boost the voltage of the PV panel input and to implement MPPT control; where a dual paralleled buck inverting circuit,serving as the back-end part,is employed to realize the sinusoidal grid current control with unity power factor and to stabilize the DC bus voltage.Because of the nonexistence of the bridge shoot through risk,dead times in the drive signals are unnecessary in dual paralleled buck inverting circuit. The MOSFET built-in body diode is inactive,which optimizes the selection of switches and diodes. Since no common mode current will be introduced,tranformerless design is acceptable. Small value capacitance is achieved for DC bus capacitor,so that bulky electrolytic capacitors can be replaced by film capacitors. The circuit topology and control strategy researched were validated by the simulation results.