基于三端口变换器的混合式电源控制策略研究

摘要

The hybrid power supply combining supercapacitors with storage batteries can make full use of the advantages that supercapacitors have high power density and storage batteries have high energy density,which can greatly improve the power characteristic and satisfy pulse loads such as electric vehicles and photovoltaic etc.This paper studies converters of hybrid power supply,which combines storage batteries and supercapacitors.A bidirectional three-port DC-DC converter was used to replace a common signal-port DC-DC converter and a control strategy of bidirectional three-port DC-DC converters was proposed to give consideration to both battery behavior and system stability.The simulation model was built in MATLAB.The simulation results prove that the topology of the converter and the control strategy are efficient by charge-discharge performance.%结合了超级电容器和蓄电池的混合式电源,能充分发挥超级电容器功率密度大和蓄电池的能量密度大的优点,大幅度提高电源性能,满足电动汽车、光伏等具有脉动性负载的要求.对混合式电源中将超级电容器和蓄电池连接起来的功率变换器进行了研究,用带有双向三端口DC-DC变换器替代了常用的单端口双向DC-DC变换器,并提出了一种适用于双向三端口DC-DC变换器能兼顾电池电性能和系统稳定性的控制策略.在MATLAB仿真环境下,建立了系统仿真模型,对其充放电情况进行仿真,验证了变换器结构和控制策略的有效性.