作　　者： ; ; ; ; ; ;

机构地区： 中国科学院

出　　处： 《新能源进展》 2016年第6期486-491,共6页

摘　　要： 在局部阴影的情况下,由于串联式光伏组件的输出特性不同而产生多个极值点,使得传统的最大功率追踪(maximum power point tracking,MPPT)方法陷入局部极值点而失效。文中提出一种针对两级并网光伏系统的改进电导增量法以适应光伏阵列在局部阴影下的多峰值最大功率跟踪,通过分析最大功率点电压的变化范围,设定最大功率电压搜索范围以提高搜索效率,并通过DC/DC Boost变换器占空比实现输入电压控制,保证算法不陷入局部极值点。最后利用仿真实验验证了该算法在有、无阴影情况下均能准确地跟踪光伏方阵最大功率,有效提高了光伏阵列输出效率。 Under partially shaded conditions, traditional maximum power point tracking (MPPT) methods may be trappedin local maximum power point due to the multiple peaks of PV array output caused by different output characteristics ofseries-connected PV modules. This paper proposes an improved incremental conductance method for two-levelgrid-connected PV system under partially shaded conditions. By analyzing the variation range of maximum power pointvoltage, voltage searching range is set to improve searching efficiency. And the voltage is controlled by the duty cycle ofDC/DC boost converter. The proposed method can search out every local maximum power point and ensure PV systemworking at global maximum power point. Simulation results confirm that the proposed method can find out maximumpower point under partially shaded or unshaded conditions, and improve the PV generation efficiency significantly.

关 键 词： 局部阴影 多峰值 电导增量法 光伏发电

领　　域： [动力工程及工程热物理] [电气工程]