隔离型三相并网逆变器的开关损耗优化控制

Optimized Control of Switching Loss for an Isolation-based Three-phase Grid-connected Inverter

提出了一种降低隔离型并网逆变器开关损耗的增益型空间矢量脉宽调制(G-SVPWM)方法。对并网逆变器系统各部分的功率损耗进行了分析,并将其分为两种类型,其中铜损耗与铁损耗定义为不可控损耗,功率器件IGBT与二极管的开关损耗定义为可控损耗。可控损耗的降低可通过向SVPWM算法中的三相参考电压配置增益环节来实现。这种G-SVPWM控制方法简单,软件算法易实现,实验结果验证了其可行性与正确性。

A gain-based space vector pulse width modulation （G-SVPWM） method is developed to decrease switching losses for an isolation-based grid-connected inverter.Total power losses are analyzed and divided into two categories. Iron loss and copper loss are called as uncontrollable loss.Switching losses of IGBTs and diodes are named as controllable loss.Controllable losses is reduced by an additional gain component to three-phase reference voltages under SVPWM method.The G-SVPWM method is simple and can be implemented easily.Experimental results confirm the feasibility and validity of G-SVPWM method.