局部遮挡条件下的光伏阵列防逆流措施选择

摘要

对于光伏发电单元，阴影的遮挡可能导致有逆流通过光伏组件，使组件发热损坏。为了防止逆流的产生，通常的做法是在组件回路设置防反二极管。而设置防反二极管可能导致设备体积增大、工程造价增加、汇流设备温度升高等问题。是否设置防反二极管以及防反二极管的设置位置是工程设计中的重点问题。本文以光伏组件的工程应用模型为基础，给出了在局部遮挡条件下逆流的计算方法，包括不设置防反二极管以及防反二极管设置在直流配电柜的逆流计算方法，根据计算结果以及生产厂商提供的光伏组件的参数，来配置防反二极管，优化设备选型。%There will be reverse current via photovoltaic when under partial shading. The reverse current can damage the photovoltaic assembly because emit hest. The general measure to prevent reverse current is configurate blocking diode. The configuration of blocking diode maybe lead to some problem. How to deploy blocking diode is a important issue in engineering design. Base on engineering model of photovoltaic assembly, gave a account method of reverse current under partial shading,include the reverse current without blocking diode and the blocking diode configurate in DC distribution panel. On the base of account result and the parameter supply by manufacturers to confugurate blocking diode, optimize the choose of equipment.