The power-voltage (PV) characteristics of photovoltaic arrays that have bypass diodes may have several local maximum power points under partial shading conditions. In order to ensure photovoltaic arrays to stay at global maximum power point (GMPP), the paper describes an improved global maximum power point tracking (GMPPT) control method based on perturbation and observation (P&O) method and incremental conductance(lNC) method. The simulation model is established and the experiment is implement. Comparing the improved control method with the same control method based on simple P&O, the results indicate that the tracking effect of improved method is better and the loss of power shake is less.%在局部阴影条件下,由带旁路二极管光伏组件构成的光伏阵列的功率-电压特性曲线可能有多个局部最大功率点.为保证寻找到光伏阵列的全局最大功率点,提出了一种基于扰动观测法和导纳增量法的改进全局最大功率点跟踪的控制方法.通过建立仿真模型和试验,验证了该方法的有效性.与基于普通扰动观测法的控制策略比较分析表明,改进算法具有更好的跟踪效果与更小的功率振荡损失.
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