Regarding the present issue on photovoltaic maximum power point tracking,the method of variable step-size admittance tracking maximum power is studied.The model of photovoltaic cells is derivated and established in the Matlab simulation,the program of fixed step and variable step incremental admittance is composed.The Maximum Power Point Tracking control is simulated.The final result is concluded.It is proved that the dynamic performance and the steady-state performance of variable step incremental admittance is more superior than the fixed step incremental admittance.%针对光伏电池最大功率追踪的问题,研究了变步长导纳增量方法追踪最大功率。推导并在Matlab下建立了光伏电池的非线性工程模型,分别编写定步长和变步长导纳增量法跟踪程序,进行光伏电池最大功率追踪仿真,并得出仿真结果,结果证明变步长导纳增量法较定步长来说,其动态和稳态性能更为优越。
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