基于PR调节器的并网逆变器双闭环控制策略的研究

针对传统PI控制器在跟踪并网逆变器交流信号时存在静差的问题,提出了基于比例谐振控制器(PR)的电网电流外环和电容电流内环的双闭环控制策略,在此基础上对控制系统进行了建模和稳定性分析,并进行了参数的设计,构建了仿真模型对理论分析进行验证。结果表明,此控制策略不仅可以做到对交流信号的无静差跟踪,而且对谐波具有精确的跟踪能力。

The Study on P+Resonant Controller based on Dual-loop Control Strategy of Grid-Connected Inverter

Because the traditional PI controller of grid-connected inverter can’t obtain zero steady-state error,dual-loop control strategy with grid current control outer loop based on PR controller and current control inner loop based on capacitor current is proposed in this paper.To model and analysis the stability of the control system,as well as design the parameters,the simulation model is constructed to verify the theoretical analysis.The result shows that this control strategy can not only do no static track to the ac signa,but also has accurate tracking ability for harmonic.