含超级电容混合储能系统直流微电网功率分配策略

针对直流微电网中微电源功率输出不稳定以及负荷波动导致直流母线电压偏移问题,提出一种含超级电容和蓄电池的混合储能系统充放电控制策略。该控制策略将储能系统分为5种工作模式,控制系统根据直流母线电压值选择混合储能系统的工作模式,实现蓄电池与超级电容在充电、放电及空闲模式间自由切换,从而维持直流母线电压稳定。通过Matlab/Simulink软件搭建系统模型,仿真结果表明,采用该控制策略可使直流母线电压保持在电压偏移允许范围内。

A DC Micro-grid Power Allocation Strategy for the Hybrid Energy Storage System Containing Super Capacitors

In order to solve the problems of unstable micro-source power output and DC bus voltage deviation caused by load fluctuation in the DC micro-grid,this paper presents a charge and discharge control strategy for the hybrid energy storage system containing super capacitors and batteries,which classifies the energy storage system into five working modes.Based on the DC bus voltage value,the control system chooses the working mode of the hybrid energy storage system to realize free switchover between the charge,discharge and the idle modes of the batteries and the super capacitors,thus maintaining stable DC bus voltage.A system model is established through Matlab/ Simulink software and the simulation results show that the DC bus voltage can be maintained in the range of permissible deviation if such control strategy is adopted.