预测电流控制双开关型双Buck并网逆变器

双Buck逆变器具有可靠性和效率高的优点,常被用作新能源发电和不间断电源的解决方案。双Buck逆变器存在输入电压高、双极性调制的缺点,采用双开关型双Buck逆变器消除这些不足,双开关型双Buck逆变器主要采用滞环电流变频控制,谐波频谱宽、滤波器设计困难,对功率器件的开关速度要求高;为此,采用SPWM控制方式实现逆变并网,使谐波频谱固定易滤除;同时通过预测电流控制策略消除电网电压扰动,提高逆变器的性能。最后通过PSIM仿真验证了理论分析与设计的可行性。

Two-switch Dual Buck Grid-connected Inverter with Predictive Current Control

Dual-buck inverter,characterized by its high reliability and efficiency,is used as solution of new energy generation and uninterrupted power supply.The dual-buck inverter's disadvantages of high input voltage and bipolar modulation can be eliminated through adoption of the two-switch dual-buck inverter with hysteresis current frequency control and wide harmonic spectrum,which leads to difficult filter design and requires high switching speed of power devices.In this background,SPWM control mode is adopted to realize inverter grid connection and make it easy to filter out harmonic spectrum fixation.In the meantime,a predictive current control strategy is adopted to eliminate grid voltage disturbance and improve converter performance.Finally,PSIM simulation verifies the feasibility of the theoretical analysis and design.