基于指数分论域的模糊控制在光伏并网中的应用研究

Application Research on Fuzzy Control Based on Exponential Sub-domain in Photovoltaic Grid Connection

针对光伏并网系统扰动观察法在最大功率点跟踪中存在精度有限、外部条件剧烈变化会产生误判等问题,提出利用指数分论域的思路,调整扰动步长。利用MATLAB/Simulink建立双闭环控制系统,同时加入模糊控制算法,进行光伏并网仿真测试,验证方法的可行性。仿真结果表明,电压、电流达到相对稳定状态用时减少0.03s,有功与无功功率达到相对稳定状态用时减少0.05s,效果良好。

In view of the problems of inadequate precision of P＆O method in MPPT of PV grid connected system and the sharp change of external condidons can lead to misjudgemenL This paper pros forward the idea of using the exponendal sub domain to adjust the disturbance step. A double closed loop control system is established by using Madab/Simulink. Meanwhile, the fuzzy control algorithm is also adopted to carry out the simuladon test, to verify its feasibility. The re subs show that the elapsed time reduces by 0.03s when the vohage and current reach a reladvely stable state, and 0.05s is reduced when the active and reactive power reach a relatively stable state.