三相并网逆变器模糊PCI控制方法

摘要

To improve the control effect of grid-connected inverter,a fuzzy-proportional-complex-integral(PCI)control method is proposed to eliminate AC disturbance self-adaptively. As the steady-state error of the control method could be zero when the disturbing signal is at a specific frequency,it has a better control effect than proportional-integral control. Moreover,LCL filter is chosen,and its feedback capacitance current is used as inner-loop to form the active damping control method,which can restrain LCL resonance effectively and reduce the ultraharmonics in grid-connected current obviously. The simulation and experimental results illustrate the validity and advantage of the proposed method.%为了优化对并网逆变器的控制效果,提出了一种可自适应消除交流扰动信号的模糊比例复数积分的控制方法.该控制方法对特定频率的交流扰动有零稳态误差调节的特性,较传统比例积分控制有更好的控制效果.在并网电路中采用LCL型滤波器,以反馈的电容电流作为控制内环,构成有源阻尼控制方法,既能够有效抑制LCL电路的谐振,也能对并网电流中的高次谐波有明显的抑制作用.最后通过仿真和实验验证了所提方法的有效性和优越性.