基于多端口DC/DC变换器的混合储能系统自适应能量控制策略

Adaptive Energy Control Strategy for Hybrid Energy Storage System Based on Multiport DC/DC Converters

研究了一种基于多端口DC/DC变换器(multi-port DC/DC converters,MPC)的混合储能系统(hybrid energy storage system,HESS),并将其应用于直流微电网。针对脉动负荷功率突变对直流母线电压及蓄电池组正常运行造成剧烈冲击的问题,提出了一种基于移动平均滤波算法的自适应能量控制策略(adaptive energy control strategy,AECS)。首先,通过移动平均滤波算法将脉动负荷功率进行滤波,由蓄电池组承担平缓的功率变化,而由超级电容器补偿瞬时的功率突变,从而优化蓄电池充放电过程,延长其使用寿命;其次,引入超级电容端电压自适应控制,将超级电容端电压稳定在参考值附近;并对蓄电池组端口采用能量流均衡控制,使各蓄电池组荷电状态(state of charge,SOC)趋于一致。通过仿真和实验,验证了所提出的能量控制策略的有效性。

A kind of hybrid energy storage system（HESS） based on multiport DC/DC converters（MPC） and its application to DC microgrid were presented. Aiming at problem of severe impact caused by pulse load power mutation on DC bus voltage and normal operation of battery bank, a new adaptive energy control strategy（AECS） based on moving average filtering algorithm is proposed. Firstly, pulse load power is filtered with moving average filtering algorithm, and battery bank is assumed to moderate power change, while using supercapacitor to compensate instantaneous power mutation, to optimize battery charge and discharge process and prolong its service life. Secondly, adaptive control of supercapacitor port voltage is presented, so that supercapacitor terminal voltage is kept near reference value. Energy flow equilibrium control is used in battery bank ports, making state of charge（SOC） of various battery banks tend to be uniform. Effectiveness of the proposed energy control strategy is verified with simulations and experiments.