改善不平衡配电网电压质量的分布式储能序次优化配置方法

Sequence Optimal Configuration of Distributed Energy Storage for Improving Voltage Quality of Unbalanced Distribution Network

分布式储能(distributed energy storage, DES)具有灵活的运行特性,通过合理配置DES可使其有效服务于有源配电网的电压管理。现有以电压管理为导向的DES优化配置研究通常基于平衡网络模型来分析储能运行特性对系统电压的影响,但配电网实际上是三相不平衡的。为此提出一种基于电压灵敏度分析的不平衡配电网DES序次优化配置方法,从改善网络电压的角度研究不平衡配电网中DES的最佳配置方法。首先基于综合电压灵敏度分析确定DES接入位置;其次兼顾系统运行的经济性,以DES一次投资和运维成本最小为目标优化DES的接入容量;最后通过改进IEEE 33节点三相配电网进行算例分析,验证了所提DES序次优化配置方法可有效改善不平衡配电网的电压质量。

Distributed energy storage(DES) has flexible operating characteristics and can be properly configured to effectively serve the voltage management in the active distribution network. The existing studies on voltage management-oriented DES optimization configuration are usually focused on the balanced network model to analyze the impact of energy storage operation characteristics on the system voltage, while the real distribution networks are actually unbalanced. To this end, a method for sequence optimization of DES in unbalanced distribution networks applying voltage sensitivity analysis is proposed, and the optimal configuration of DES in unbalanced distribution networks is studied from the perspective of improving the network voltage. Firstly, the DES access location is determined according to the comprehensive voltage sensitivity analysis;secondly, taking into account the economy of system operation, the access capacity of DES with the goal of minimizing the investment and maintenance cost of DES is optimized. Finally, by improving the IEEE 33-node three-phase distribution network to carry out a calculation example analysis, it is verified that the proposed DES sequence optimization configuration method can effectively improve the voltage quality of the unbalanced distribution network.