摘要
当多个分布式电源(distributed generation,DG)并联运行时,传统的下垂控制能实现各DG的输出功率均分,但无法维持储能单元荷电状态(state of charge,SOC)一致。提出一种改进的下垂控制策略,通过设计变下垂系数并引入SOC功率指令项,改变DG各单元的下垂曲线,从而使SOC较高的单元输出更多功率,反之SOC较低单元则输出功率较少,最终在空载和负载情况下均可实现各单元的SOC均衡,同时保留传统下垂控制无需互联线的优点。以2台DG并联带载为例,通过求解微分方程得到SOC均衡算式的解析结果,并通过建立控制模型分析SOC变化和参数选择对系统稳态和动态性能的影响,最后搭建100 kVA的DG并联实验平台,验证该文提出控制策略的有效性。
In parallel distributed generation(DG)system,traditional droop control can share the load power,but can’t balance the state of charge(SOC)of each unit. This paper presents an improved droop control strategy,the droop curve is changed by designing variable droop coefficient and introducing SOC power reference unit,causing the converter with higher SOC delivering energy to the one with lower SOC,then the SOC of the two modules will be balanced,and the power share ability and no communicated line of the traditional droop control are both retained. The analysis answer of SOC balance is gained by solving the differential equation in two DG paralleled system. The performance of system is analyzed by establishing the two order control model. Finally the proposed strategy is validated with 100 kVA parallel DG system.
作者
胡超
张兴
石荣亮
刘芳
徐海珍
曹仁贤
Hu Chao;Zhang Xing;Shi Rongliang;Liu Fang;Xu Haizhen;Cao Renxian(School of Electrical Engineering and Automation. Hefei University of Technology, Hefei 230009, China;Sungroiv Power Supply Co. Ltd., Hefei 230088, China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2019年第3期809-816,共8页
Acta Energiae Solaris Sinica
基金
国家重点研发计划(201YFB0900300)
国家自然科学基金(51677049)
关键词
分布式电源
荷电状态
下垂控制
储能
distributed generation
state of charge
droop control
energy storage
