三相四桥臂动态无功补偿器仿真研究

提出采用三相四桥臂结构的逆变器实现三相四线制系统中的无功补偿。实现方法是:应用瞬时无功功率理论,在三相三线制系统中应用的电流检测法基础上,提取零线电流后用于三相四线制系统,并给出了理论推导和实现方法;再给出利用空间矢量法产生触发脉冲的方法;最后用PSCAD仿真软件搭建了系统仿真图,设计了控制策略,在三相四线制下对容性、感性及整流桥等负载情况进行了无功补偿仿真,仿真结果验证了控制算法的可行性。

Simulative research on three-phase four-leg dynamic var compensator

A method to compensate the reactive power in three-phase four-line system by using three-phase four-leg inverters is put forward.Based on the instantaneous reactive power theory,after eliminating terra current,the current detection method used in three-phase three-line system is applied to the three-phase four-line power system.The deduction and realization are provided.The space vector technique is then applied to spring impulses.The PSCAD software is used to build the system simulation diagram and the control strategy is designed.The var compensation simulation for different loads of capacitance,inductance and rectifier in three-phase four-line system is carried out.Simulation results validate its feasibility. This project is supported by the Excellent Youth Teacher Scientific Research Foundation of Southeast University.