具有APF功能的光伏并网发电系统的研究

探讨了一种具有有源滤波器功能的光伏并网发电系统。该系统白天可有效地进行光伏并网发电,还可补偿或抑制本地非线性负载产生的无功和谐波,夜晚系统仍可作为APF继续工作。相对于单独的光伏并网系统,它不但提高了设备利用率,也改善了电网的供电质量。文章分析了系统的结构组成,还采用了具有较好鲁棒性和动态响应速度的、基于瞬时无功理论的闭环无功和谐波电流检测的方法,分析了并网电流的合成及其跟踪控制。最后,利用Matlab/Simulink对系统进行了仿真,验证了系统的可行性。

A study of grid-connected photovoltaic power system with the function of active power filter

The grid connected photovoltaic(PV) power system with the function of active power filter(APF) was discussed.During the daytime,the system can provide not only PV grid-connected generation but also reactive power compensation and harmonic suppression which comes from the local nonlinear load.The system can continue to work as the APF at night.This compares to single photovoltaic system,which not only improves the utilization ratio of equipment but enhances the quality of power supply as well.In this paper,the structure of system,the method of reactive power and harmonic current closed-loop detection based on the theory of instantaneous reactive power with excellent robustness and dynamic response speed,combination of grid-connected current and current tracking are all discussed.Finally,the system is simulated with Matlab/simulink,and then the simulation results validate the feasibility of the system.