基于SOC和等微增率准则的分布式储能控制方法  

A Control Strategy Based on State-of-Charge and Equal Incremental Cost Criterion for Distributed Energy Storage

作　　者：韦佐霖 陈民铀[1] 李强[1] 陈飞雄 凌伟方 

机构地区：[1]重庆大学电气工程学院输配电装备及系统安全与新技术国家重点实验室,重庆

出　　处：《智能电网（汉斯）》2017年第2期47-58,共12页Smart Grid

基　　金：国家自然科学基金资助项目(51177177,61105125)。

摘　　要：在微电网运行中,不同状态的蓄电池储能单元具有不同的功率支撑能力,从而影响系统供电的稳定性和可靠性;同时研究发现储能充放电效率与其充放电功率及SOC有密切关系。针对上述问题,提出了一种基于分布式储能单元SOC和等微增率准则的控制方法,以提高负荷功率在分布式储能单元间的分配精度和降低系统有功损失。通过等微增率准则将系统有功损失目标函数转化并求解,然后将各分布式储能单元SOC和微增率作为下垂控制输入量,通过收集本地信息,实时调节各储能单元输出功率,以实现供需两端功率的动态平衡和储能单元间SOC的差异均衡。最后通过Matlab/Simulink仿真分析了所提控制策略在分布式负载波动和系统储能单元故障切除情况下的控制效果,仿真结果验证了本文所提方法的有效性和“即插即用”特性。In a microgrid, different types of battery energy storage units (BESU) have different power sup-porting capacity, which affects the system stability and reliability. And recent research has dis-covered that the charging/discharging efficiency of BESU has remarkable dependence on the charging/discharging rate and state-of-charge (SOC) of the BESU. Therefore, in this paper a control strategy to improve the accuracy of power dispatch and reduce system power losses is proposed, in which the state-of-charge (SOC) and equal incremental cost criterion of multiple parallel distributed BESU are considered. Based on the equal incremental cost criterion, the objective function of system power losses is transformed and solved. And in this method, which only needs the local information, the SOC and incremental cost of each distributed BESU are employed in the controller to adjust its output power in real-time, thus realizing dynamic balance between supply and demand, and eliminating SOC error of parallel distributed BESU. Finally, a Matlab/Simulink model is built to test the balancing effects of the proposed control strategy, in which the variations in distributed loads and distributed BESU are both considered. Simulation results demonstrate the validity as well as the plug and play capability of the method.

关 键 词：孤岛微网 分布式储能 SOC 充放电效率 等微增率 

分 类 号：TM7[电气工程—电力系统及自动化]