V2G系统中三电平逆变器改进型SVPWM算法研究

Research on Improved SVPWM Algorithm of Three-Level Inverter in V2G System

针对V2G系统中三电平逆变器SVPWM调制算法过于烦琐、实现较为困难以及在电动汽车电能逆变并网控制中输出电能质量不理想等问题,引入60°坐标系简化传统的三电平SVPWM算法。以SVPWM调制算法为研究对象,以V2G系统为应用背景,以基于电网电压定向的矢量控制作为并网控制策略,给出在60°坐标系下空间矢量脉宽调制算法的建立原则,得出基于60°坐标系的SVPWM算法与传统算法相比更加简化。在逆变器并网控制中能够降低输出总谐波含量,明显改善电能质量。通过仿真验证了改进型三电平SVPWM算法的优越性。

In this paper,the three-level inverter SVPWM modulation algorithm in the V2G system is too cumbersome,difficult to implement,and the output power quality is not ideal in the control of electric vehicle power inverter grid-connected.The 60°coordinate system is introduced to the traditional three-level SVPWM algorithm is simplified.Taking the SVPWM modulation algorithm as the research object,taking the V2G system as the application background,and taking the grid voltage-oriented vector control as the grid-connected control strategy.The establishment principle of the space vector pulse width modulation algorithm under the 60°coordinate system is given,and it is concluded that the SVPWM algorithm based on the 60°coordinate system is more simplified in algorithm than the traditional one.In the inverter grid-connected control,the output total harmonic content can be reduced,and the power quality can be significantly improved.The superiority of the improved three-level SVPWM algorithm is verified by simulation.