针对光伏系统最大功率点跟踪控制速度不稳定的问题,提出一种改进的变步长电导增量法.对电导增量法变步长的触发条件进行改进,确定变步长的使用范围,并选取适当的缩放系数,使光照强度发生变化时可稳定地跟踪最大功率点.仿真结果表明,该算法在光照强度发生大幅度变化时,具有较快的响应速度和较高的跟踪精度.%Aiming at the problem that photovoltaic Maximum Power Point Tracking(MPPT) controls speed unsteadily, an improved variable step size Incremental Conductance(INC) method MPPT algorithm is proposed. By improving INC method step change trigger conditions, the proposed algorithm can improve the MPPT response speed and accuracy at steady state simultaneously when the irradiance occurs a substantial change. Simulation results show that the proposed algorithm has a faster response speed and higher tracking accuracy in sudden large irradiance changes.
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