一种双电压环的电网电压发生器系统的研究

Research on a Grid Voltage Generator System With Dual Voltage Loop Structure

对比不同电网电压发生器拓扑结构,分析各拓扑结构优缺点,设计了一种单相级联型电压发生器拓扑。根据此拓扑结构原理建立其数学模型,在分析数学模型的基础上推导出了双电压环控制系统:有效值外环、瞬时值内环及电流内环的传递函数,并对控制系统的传递函数波特图进行分析,得出其设计的合理性,最后通过仿真和实验验证了电网发生器控制策略的有效性。

The different grid voltage generator topology are compared firstly, and advantages and disadvantages of each topology structure are analyzed, and then a single phase cascaded grid voltage generator topology is designed.Then the mathematical model is established according to the topology principle, and then the dual voltage loop＇s transfer func- tion of the control system is derived based on the mathematical model：the effective value of the outer control loop, the instantaneous value of the inner control loop, also the inner current control loop, and the Bode graph of transfer function of the control system is analyzed, the rationality of its design is concluded, at last, the effectiveness of the control strategy of grid power generator is verified through simulation and experiment.