基于双环控制的容性逆变器控制方法研究

Research on the Capacitive Inverter Control Method Based on Dual-loop

针对逆变器滤波电感电流反馈、滤波电容电流反馈存在的不足,提出反馈负荷电流的方法以改善系统性能。通过对电容特性输出阻抗逆变器建模,得出输出阻抗呈电容特性的配置方法;分析反馈负荷电流的双闭环控制,得出系统的闭环传递函数,并利用闭环极点配置方法设计控制器参数。通过MATLAB中仿真,证明由改进的控制方法控制容性逆变器,表现出动态响应更快、抗负载扰动能力更强等优点;在非线性负载时,对输出电压波形THD有很好的抑制作用。

To tackle at the deficiency of the inverter in filter inductor current feedback and filter capacitor current feedback,a method of load current feedback is proposed to improve the performance of the system. First the configutation method of output impedence was obtained through the modeling of output impedance. Then,the double closed-loop control of the load current feedback was analyzed to get the dosed lop transfor function and controuer parameters were set by using closed-loop of pole placement method. Finally,the simulation was conducted in Matlab and the results proved that the improved control method,boosting the advantages of faster dynamic response and stronger anti-disturbance,was better at controlling the capacitive inverter and that it had a good inhibitary effect on the voltage output waveform THD in nonlinear load.