基于二阶一致性算法的电池储能系统SOC均衡及功率分配策略  

SOC Balancing and Power Distribution Strategies Based on Second-order Consensus Algorithm

作　　者：王颂 汪隆君[1] 王钢[1] 钟庆[1] 曾德辉 WANG Song;WANG Longjun;WANG Gang;ZHONG Qing;ZENG Dehui(School of Electric Power Engineering,South China University of Technology,Guangzhou,Guangdong 510641,China;Guangzhou Jiayuan Electric Power Technology Co.,Ltd.,Guangzhou,Guangdong 510610,China)

机构地区：[1]华南理工大学电力学院,广东广州510641 [2]广州嘉缘电力科技有限公司,广东广州510610

出　　处：《广东电力》2024年第4期1-9,共9页Guangdong Electric Power

基　　金：国家自然科学基金项目(51307063)。

摘　　要：为延长电池储能系统的整体寿命,需保持储能系统中各单元的荷电状态(state of charge,SOC)均衡。为此,提出一种基于二阶一致性算法的改进下垂控制策略,通过指数函数嵌套变化系数,实现不同容量储能单元快速SOC均衡。在SOC均衡的基础上设计二次控制策略,在一定通信时延下实现频率、电压恢复和有功、无功功率合理分配。最后,以4台储能单元组成的电池储能系统为算例进行仿真,验证了所提控制策略的有效性,SOC能够快速收敛达到均衡状态,频率、电压能够恢复到额定值,有功、无功功率能够按照相应下垂系数比例进行分配。In order to extend the overall lifetime of the energy storage system,it is necessary to keep the state of charge(SOC)of each energy storage unit in the energy storage system in a balanced state.Therefore,this paper proposes an improved droop control strategy based on the second-order consensus algorithm,which is able to realize the SOC balancing of energy storage units with different capacities fast by nesting the coefficients of variation in the exponential function.The secondary control strategy is designed on the basic of SOC balancing,which is able to achieve frequency/voltage restoration and active/reactive power reasonable distribution under certain time delay.Finally,the simulation of the battery energy storage system composed of 4 energy storage units verifies the effectiveness of the proposed control strategies.The results indicate the SOC can quickly converge to reach the balanced state,the frequency/voltage can be restored to the rated value,and the active/reactive power can be allocated proportionally.

关 键 词：储能单元 下垂控制 荷电状态均衡 二阶一致性算法 频率、电压恢复 功率分配 

分 类 号：TM912[电气工程—电力电子与电力传动] TM761