变论域模糊控制器在光伏系统MPPT中的应用研究

摘要

In order to solve the problem of the nonlinear characteristics of photovoltaic power generation system and the steady state error of the general fuzzy control,the variable universe fuzzy control was applied to the photovoltaic MPPT system and the selection of the expansion factor of variable universe fuzzy control and the design of the controller were introduced,MATLAB/Simulink was used to establish the MPPT system simulation model based on BOOST conversion circuit.Adjusting the duty ratio of the Boost circuit switch tube,the method was made to work at maximum power point of photovoltaic cells.The work had been carried on with simulation.Finally simulation was used to prove the efficiency of this method.The simulation results showed that the variable universe fuzzy control can improve the stability of MPPT,reduce the static error and fluctuation,improve the utilization rate of solar energy.%为了解决光伏发电系统非线性特点及一般模糊控制存在稳态误差的问题,将变论域模糊控制应用到光伏发电系统的MPPT(Maximum Power Point Tracking)中,介绍了变论域模糊控制伸缩因子的选取及控制器的设计,运用MATLAB/Simulink建立基于BOOST转换电路的MPPT系统仿真模型.通过调节Boost电路开关管的占空比使光伏电池工作在最大功率点,并对该方法进行了仿真验证.仿真结果表明,变论域模糊控制能够改善光伏发电系统MPPT的稳定性,减小稳态误差与波动,提高太阳能的利用率.