【摘要】 通过仿真分析比较了3种升压拓扑的优缺点,选择了填谷式移相全桥拓扑结构,并提出了一种跨导型双环控制的变换器,实现了电池放电变换器(BDR)模块的并联功率输出,设计了均流精度补偿器,提高了并联模块间的均流精度,并由外部电压环保证母线具有良好的动态响应。给出了1500W BDR模块的设计实例,实验结果表明:输出均流精度误差在1%以内,10%载效率为95%,半载效率为98.5%,满载效率大于97%,该并联控制方案及均流精度补偿器具有良好的动静态性能,为大功率的BDR功率扩展提供了有效的技术手段。更多还原

【Abstract】 The step-up power stage is usually used in the battery discharge regulator(BDR) which provides energy from the battery to the bus in high-power photovoltaic generation system.The advantages and disadvantages of three step-up power topologies are compared by simulation analysis in this paper,and the valley-fill phase-shift full-bridge power topology is adopted.The dual-loop control converter based on conductance control is proposed to achieve parallel operation of BDR modules,and the compensator of current-sharing accuracy has been designed to improve the current-sharing performance of BDR modules in parallel operation.Excellent dynamic response of the bus is ensured by the external voltage control loop.An example of 1500W BDR module is given in the paper,and the experimental results show that the output current-sharing accuracy is better than 1%,the efficiency of 10% load is 95%,the efficiency of half load is 98.5%,and the efficiency of full load is above 97%.Good static and dynamic performance is achieved by using the parallel control theory and the compensator of current-sharing accuracy,which provides an effective technical approach for the power extension of high-power BDR modules.更多还原