一种光伏并网系统用的宽输入辅助电源设计  

Design of a Wide-input Auxiliary Power Supply in the PV Inverter System

作　　者：胡天友[1] 张晓博[1] 王海[1] 刘洋[1] 

机构地区：[1]电子科技大学机械电子工程学院,四川成都611731

出　　处：《实验室研究与探索》2012年第9期4-6,31,共4页Research and Exploration In Laboratory

基　　金：国家自然科学基金资助项目(611061107)

摘　　要：根据光伏并网逆变系统的供电需求,设计了一种120～850 V宽输入的辅助电源。为防止在输入电压过高时丢失开通脉冲,在传统的单端反激式拓扑电路的基础上加入了变频电路。输入电压升高时,降低开关频率,保证导通时间大于开关管的最小导通时间,实现了宽输入范围电压的要求。采用DCM工作模式,峰值电流控制,在反馈电路中加入了2型补偿网络,保证了输出电压快速调节性和稳定性。样机实验结果表明,该电源能够适应输入电压在大范围波动,可靠地为光伏并网实验系统供电。According to the requirement of the PV grid-connected inverter system, an auxiliary, power supply with an input voltage of 120- 850 V is designed. To avoid losing the opening pulse at a high input voltage, a circuit that can change switching frequency based on the input voltage is introduced. The peak current control and DCM work mode is used, and the type-2 compensation circuit in the feedback loop guarantees the rapid adjustment of output voltage and stability of the system. Experimental results show that this auxiliary power supply can adapt to a wide fluctuation of input voltage and provide long-term reliable DC voltage to the PV system.

关 键 词：光伏 辅助电源 反激式 变频 

分 类 号：TM464[电气工程—电器]