基于分段非线性权重值的Pso算法，三相光伏逆变并网的仿真，部分实现了追踪测速迭代松弛算法，基于互功率谱的时延估计，IMC-PID是利用内模控制原理来对PID参数进行计算，双向PCS控制仿真。-Based on piecewise nonlinear weight value Pso algorithm, Three-phase photovoltaic inverter and network simulation, Partially achieved tracking speed iterative relaxation algorithm, Based on the time delay estimation of power spectrum, The IMC- PID is using the internal model control principle for PID parameters is calculated, Two-way PCS control simulation.