摘要
针对在微型直流电网中需要将两线制直流电网改造成三线制直流电网以满足不同用电设备对输入电压的要求问题,提出并研究一种新型、可靠的电压均衡电路及其控制方法。此电压均衡电路由左、右两个桥臂组成,可以避免传统桥式拓扑结构中功率开关管直通问题;其控制方法也能够根据负载情况自动实现分别控制每个桥臂独立工作,从而有利于提高该电压均衡电路效率。在此基础上详细地分析该电路工作原理和主要电流关系,为了控制参数的设计并建立其小信号模型。最后,给出相应的仿真结果,并研制一台实验样机进行原理性实验验证。仿真和实验结果表明,该电路和控制方法能够实现电压平衡。
In order to convert a two-wire dc power transmission mode into a three-wire dc power transmis- sion mode, which can meet the needs of the different input voltage levels of different power converters in micro de grid, a voltage balancing circuit with a high reliability and a control strategy are presented in this paper. The circuit was made up of two bridge legs for escaping shoot-through problem in conventional bridge topology, and the control strategy made each bridge leg operate separately. Its small-signal model was also given for selecting suitable controlling parameters. Finally, simulation and experimental results verify that the proposed voltage balancing circuit and control strategy well balances input voltage.
出处
《电机与控制学报》
EI
CSCD
北大核心
2013年第1期37-42,共6页
Electric Machines and Control
基金
国家重点基础研究发展计划(973计划)资助项目(2007CB210303)
关键词
新能源
直流电网
均衡电路
双降压结构
小信号模型
renewable source
DC grid
balancing circuit
dual buck topology
small-signal model
