中文摘要：

针对传统逆变器控制策略对交流电压信号跟踪存在静差的问题,提出基于比例谐振控制器的电容电压外环和电感电流内环的双闭环控制策略,并在此基础上对系统进行建模,分析了在这种双闭环结构下,系统具有对交流信号实现无静差跟踪和抗负载电流扰动的能力.进一步,采用根轨迹理论,结合系统稳定性判据分析了比例谐振控制器参数对系统极点的影响,并设计极点位置,选择合适控制器参数,保证系统具有较好的稳定性和动态性能.最后,通过仿真验证了该控制策略和参数设计方法的有效性.

英文摘要：

Because the traditional control strategy of inverter can＇ t obtain zero steady-state error, a voltage con- trol loop based on proportional-resonant （PR） controller and current control loop based on inductor current is pro- posed. The model of the control system was and built the double-loop control strategy was analyzed. The result shows that the system can achieve steady-state error and have good anti-interference ability at the fundamental fre- quency. Furthermore, the theories of root locus and stability criterion are applied to analyze the PR regulator pa- rameters, based on which the controller parameters can be properly selected to guarantee the stability of the system and the dynamic performance. Finally, the simulation results demonstrate the effectiveness of the control strategy and tuning method.