对光伏发电系统并网输出最大功率点的跟踪的研究,能够有效提高光伏发电系统的电能转换效率.对输出最大功率点的跟踪,需要先得到模糊控制器的输入变量,从而定义功率最大点跟踪的目标函数,完成最大功率点的跟踪.传统方法先预测最大功率点之处的电压,得到光伏电池的特性曲线,但忽略了定义功率最大点跟踪的目标函数,导致控制精度偏低.提出基于改进粒子群方法的光伏发电系统并网输出最大功率点跟踪方法.组建光伏发电系统并网数学模型,将输出最大功率点跟踪转换为追踪光伏阵列,融合模糊理论计算出光伏电池的瞬时输出功率,得到模糊控制器的输入变量,定义功率最大点跟踪的目标函数,并完成对光伏发电系统并网输出最大功率点跟踪.实验结果表明,所提方法跟踪精度高,为完善我国在光伏发电方面的技术水平提供有力的依据.%A tracking method for maximum power point of gird-connected output of photovoltaic power generation system is proposed based on the modified particle swarm.Firstly,gird-connected mathematic model of the photovoltaic power generation system is built,and the tracking of the maximum power point of output is converted into tracking of photovoltaic array.Then,integrated with fuzzy theory,instantaneous output power of photovoltaic cell is worked out and input variable of fuzzy controller is obtained.Moreover,objective function of the tracking is defined.Finally,the tracking of the maximum power point of output is completed.Simulation results show that the proposed method has high tracking precision.It provide powerful gist for perfecting technological level of our country in aspect of photovoltaic power generation.
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