基于部分功率变换的光伏组串电压补偿器研究

Design of Photovoltaic String Voltage Equalizer Based on Partial Power Processing

研究了在光伏系统的每个组串中串联电压补偿器,从而提高组串输出功率的方法。通过分析补偿器的原理、实现拓扑及相关控制策略,使其在兼顾成本和效率的同时,实现组串级最大功率点跟踪(MPPT),并维持组串之间电压平衡。该结构不仅适用于改造传统集中式阵列,也可与光伏组件优化器配合应用。最后在光伏模拟平台上,实现了补偿器MPPT功能,验证了光伏组串补偿器具有提高系统发电效率的结论。

The method of inserting a string voltage equalizer with the photovoltaic string in series is studied, so as to promote the output power of the string.By analyzing the principle ,the realization circuit topology and the control algo- rithm of the string voltage equalizer,the proposed string voltage equalizer realizes maximum power point tracking（MPPT） in string level, and maintain the voltage balance between strings.This converter could be employed in the application of reconstructing traditional photovoltaic array, and in the system installed module integrated converter.At last, a pho- tovohaic emulator platform is established, and the experiment is implanted, which testifies the validity of photovohaic string voltage equalizer on MPPT and verifies the function of improving power generating efficiency.