光伏并网发电系统中的最大功率点跟踪控制

为实现光伏并网系统的最大功率点跟踪控制,提出了一种适用于基于混合控制的级联逆变器的光伏并网发电系统的双级控制策略.通过电流瞬时值反馈滞环控制,将输入电压控制(功率控制环)和光伏系统入网电流控制(电能质量控制环)解耦,简化了控制器设计.首先对该双级控制策略进行了分析,然后对瞬时值反馈单元控制器参数进行了设计,最后进行了仿真和实验.仿真和实验结果验证了所提出的控制方法的有效性,表明该双级控制策略可在进行最大功率点跟踪的同时保证入网电流质量

Tracking Control of Maximum Power in Grid-Connected Photovoltaic Power System

For realizing the tracking control of maximum power of the grid-connected pnotovoltalc power system, this paper presents a two-stage control strategy that is suitable for the grid-connected photovoltaic power system based on hybrid controlled cascaded inverter, where, the input voltage control （power control loop） and the grid current regulation （power quality control loop） are decoupled by controllin~ the instantaneous current feedback with hysteretic loop, which simplifies the design of controller. Firstly, the two-stage control strategy is analyzed, then, the controller parameters of the instantaneous current feedback unit are designed, and finally, the simulation and experiment are performed. The results prove that this proposed control method is of availability, and indicates that the two-stage control strategy can guarantee the grid current quality while tracking the maximum power