摘要
为了平抑风力发电接入直流微电网的功率波动问题,满足负荷持续高质量供电需求,对由锂电池和超级电容器组成的混合储能系统进行了研究。以超级电容电压和锂电池荷电状态为约束条件,将储能系统平衡所需的功率差分为低频与高频部分;锂电池用于吸收和释放低频部分,超级电容用于吸收和释放高频部分,使风机整流器工作在恒压状态,采用电压外环、电流内环双闭环控制,以直流母线的电压稳定为目标,维持系统功率平衡。仿真结果表明,所提混合储能系统控制策略具有较快的动态响应速度和较好的控制性能,可很好地满足负载功率需求,稳定直流母线电压。研究结果可为分析规模化新能源接入直流微网系统的稳定问题提供参考。
In order to stabilize the power fluctuation when the wind power generation is planted into DC microgrid and meet the demand for continuous high quality power supply,a hybrid energy storage system consisting of lithium battery and super capacitor is studied.Constrained by the super capacitor voltage and the state of charge of the lithium battery,the power required to balance the energy storage system is divided into a low frequency and a high frequency portion;the lithium battery is responsible for absorbing and releasing the low frequency portion,and the super capacitor is responsible for absorbing and releasing the high frequency portion.The fan rectifier is operated in a constant voltage state,and the voltage outer loop control and the current inner loop control loop are adopted.The voltage stability of the DC bus is targeted to maintain system power balance.The simulation results show that the proposed hybrid energy storage system control strategy has faster dynamic response speed and better control performance,which can meet the load power demand and stabilize the DC bus voltage.The research results provide a reference for analyzing the stability of large-scale energy access to DC microgrid systems.
作者
敦若楠
郭英军
孙鹤旭
安聪慧
DUN Ruonan;GUO Yingjun;SUN Hexu;AN Conghui(School of Electrical Engineering,Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China)
出处
《河北工业科技》
CAS
2019年第6期384-389,共6页
Hebei Journal of Industrial Science and Technology
基金
河北省科技计划项目(16214510D)
关键词
发电工程
直驱风机
直流母线
功率波动
混合储能
power generation project
direct drive fan
DC bus
power fluctuation
hybrid energy storage
