电池储能提高电网薄弱节点电压稳定性的研究

Study on Battery Energy Storage to Improve Voltage Stability of Weak Nodes in Power Grid

电池储能技术凭借其快速、准确的功率响应能力成为在电力系统中平抑电压波动、改善电压质量的有效方法之一。首先,在分析储能系统的暂态特性的基础上,利用电力系统分析软件PSASP对CEPRI-36节点系统进行电压稳定计算,于系统起始稳态运行时和电压稳定达到极限时分别采取灵敏度分析和模态分析,得出系统的电压薄弱节点。其次,提出一种考虑有功调节死区及无功功率限制的电池储能系统机电暂态模型,并对该储能模型接入薄弱点以提高薄弱点电压稳定性。进行了仿真分析,结果表明该模型可改善薄弱点电压稳定性,并且接入薄弱节点较接入其他节点在维持电压稳定方面具有优越性。

Battery energy storage technology has become one of the effective methods to suppress voltage fluctuation and improve voltage quality in power system due to its fast and accurate power response ability.Firstly,based on the analysis of the transient characteristics of the energy storage system,the voltage stability of CEPRI-36 node system was calculated by PSASP.Sensitivity analysis and modal analysis were adopted respectively when the system was in initial steady state operation and voltage stability reached the limit,and the weak nodes of the system were obtained.Secondly,an electromechanical transient model of battery energy storage system(BESS)considering dead zone of active power regulation and reactive power limitation was proposed.The energy storage model was simulated and analyzed to improve the voltage stability of the weak nodes.The simulation results show that the model can improve the voltage stability of weak nodes and accessing weak nodes to the model is superior to accessing other nodes in maintaining voltage stability.