传统的最大功率点跟踪(maximum power point tracking, MPPT)方法在均匀辐射条件下效率较高，但由于光伏阵列与辐射、温度之间的强非线性特性，在局部遮荫条件下阵列的多峰特性易使传统的MPPT方法陷入局部极值，无法有效追踪最大功率。建立了局部遮荫条件下的光伏阵列模型，针对局部遮荫产生的多峰情况，采用电压扫描比较的方法确定最大功率点附近的电压，并以此电压值作为变步长电导增量法的初始值进行搜索，最终确定最大功率点的位置。该方法避免了在多峰条件下最大功率点跟踪陷入局部极值，实现了有效跟踪。

ABSTRACT： The traditional maximum power point tracking (MPPT) methods under even radiation condition usually have high efficiency. As the strong nonlinearity between photovoltaic (PV) array, irradiance and temperature, the traditional MPPT methods fall into local maximum under partially shaded conditions, which result in the failure of tracking the maximum power point. This paper established the PV array model under partially shaded conditions, and the voltage sweeping (VS) method was first used to get the voltage near the maximum power point by voltage sweeping comparison method, according to the multi-peak conditions caused by partially shade. Then the voltage value near the maximum power point was used as the initial value of variable step size incremental conductance method (INC) to finally locate the maximum power point. This method can avoid the maximum power point falling into local maximum under multi-peak conditions and effectively track the maximum power point under partially shaded conditions.