电动汽车用三端口Buck&Boost变换器的能量管理策略

Power management strategy of three-port Buck & Boost converter in electric vehicles

在电动汽车供电系统中,采用一个多端口直流变换器(Multi-Port Converter,MPC)代替原有的多个单输入直流变换器,可简化系统结构,降低系统成本。本文采用三端口Buck&Boost变换器构建电动汽车供电系统,详细分析了系统的五种工作模式,根据每种工作模式的工作特点提出了相应的控制策略,实现了系统功率的合理分配和模式之间的自由切换。研制了一台1kW的原理样机,实验结果验证了理论分析的正确性和能量管理策略的有效性。

In the electric vehicle power system with two or more sources, the application of multi-port converter （MPC） instead of several single-input converters can simplify the system configuration and reduce the overall cost. In this paper, a three-port Buck ＆ Boost converter was adopted to build up the electric vehicle power system, and the characteristics of the system in five operation modes were presented. According to the characteristics of each op-eration mode, the corresponding control strategy was proposed. A lkW prototype was built in the laboratory, and the experimental waveforms were shown in detail to verify the operating principle of the converter and the effective-ness of the power management strategy.