基于SVM的不平衡电网下VIENNA整流器性能优化

Performance optimization of VIENNA rectifier based on SVM under unbalanced grid

为了减小不平衡输入条件下直流侧电压纹波和无功功率的直流分量,在VIENNA整流器稳态运行分析的基础上,采用改进型直接同步解耦方法对电流内环建模,同时加入少量功率补偿来扩大工作区域,以适应不同程度的不平衡电压。另外,加入死区控制追踪参考电流,选择最佳占空比驱动门极开断。该控制策略有效地实现直流侧电压纹波消除以及功率因数校正。仿真和实验验证了该控制策略的可行性。

On the basis of the steady state analysis of the VIENNA rectifier,an improved direct synchronous decoupling method is used to model the current inner loop,and a small amount of power compensation is added to expand the working area to adapt to different degrees of unbalanced voltage,which can reduce the DC voltage ripple and reactive power DC component under unbalanced input condition.In addition,this paper adds dead-beat control to track the reference current and selects the best duty cycle to drive the gate.The control strategy effectively realizes DC side voltage ripple elimination and power factor correction.Simulation and experiment verify the correctness of the theoretical analysis and the feasibility of the control strategy.