基于准Z源变换器的混合储能系统应用研究

Application of Hybrid Energy Storage System Based on Quasi-Z-source Converter

提出一种基于双向准Z源变换器(QZSC)的超级电容-电池混合储能系统(HESS)。利用双向QZSC的升降压特性使电动汽车储能系统和驱动系统相融合,节省了电池功率变换器,且降低了电池与超级电容额定电压。重点阐述了不同运行模式下稳态运行原理,同时为发挥不同储能单元功率与能量密度的优势,提高HESS动态响应,在电机矢量控制中嵌入了储能系统功率分频协调控制方法。实验验证了所提HESS及控制策略的有效性。

An ultracapacitor-battery hybrid energy storage system（HESS） for electric vehicle based on bi-directional quasi-Z-source converter（QZSC） is proposed.The proposed system is incorporated in the traction converter system by using the QZSC, thus the battery converter can be omitted and the rated voltages for the battery package and ultra capacitors are reduced.The steady power distribution principle is explained under various operation modes.A frequency dividing coordinated control is then employed to enhance the system＇s dynamic response.Both the simulation and experimental results validate the performance of the proposed HESS.