锂电池/超级电容混合动力系统及控制策略

混合动力轻轨车(Hybrid Light Rail Vehicle,HLRV)以锂电池作为主动力源,超级电容作为辅助动力源,具有良好的技术性与经济性。提出锂电池与超级电容分别通过Buck/Boost双向变换器并联于直流母线侧的储能主电路结构,以实现功率的双向调节并提高超级电容器利用率。为了提高系统输出功率以及减小电流纹波,采用三相交错并联结构。针对锂电池响应速度慢的问题,提出了超级电容响应负载变化,锂电池响应超级电容低频分量的间接功率控制策略。仿真结果验证了该系统以及控制策略的正确性。

Control of Lithium Battery/Supercapacitor Hybrid Power Sources

Hybrid Light Rail Vehicle (HLRV) with on-board energy storage systems has good characteristic in technical and economical. The control strategy for a voltage-regulated dc hybrid power source employing lithium battery (LB) as the main power source and supercapacitor (SCAP) as the auxiliary power source is proposed. To insure energy-efficient operation of the system and reduce the current ripple, the use of paralleling bidirectional dc-dc converter (BDC) with interleaved technique is applied. As a high dynamic and high-power density device, SCAP functions to supply energy to regulate the DC bus energy. LB, as a slower dynamic source in the system, functions by supplying energy to keep SCAP charged or discharged with limited current. Simulation results obtained from the control strategy are presented and analyzed.