构网型储能并网系统全工况振荡特性分析  

Analysis of oscillation characteristics of grid forming energy storage grid-connected system under all working conditions

作　　者：刘洋 陆秋瑜 张帆 谢平平 李力 龚振 LIU Yang;LU Qiuyu;ZHANG Fan;XIE Pingping;LI Li;GONG Zhen(Electric Power Dispatching Control Center of Guangdong Power Grid Co.,Ltd.,Guangzhou 510620,China;State Key Laboratory of HVDC,Electric Power Research Institute of China Southern Power Grid,Guangzhou 510663,China)

机构地区：[1]广东电网有限责任公司电力调度控制中心,广东广州510620 [2]南方电网科学研究院直流输电技术全国重点实验室,广东广州510663

出　　处：《电力自动化设备》2025年第3期24-32,共9页Electric Power Automation Equipment

基　　金：南方电网公司科技项目(036000KK52220025(GDKJXM20220329))。

摘　　要：构网型储能可以改善新能源机组接入弱电网的次/超同步振荡稳定性,却未关注其在全工况下的稳定性特征。针对此问题,构建了构网型储能并网系统的频率耦合二维阻抗模型,相比传统一维阻抗模型,提高了次/超同步稳定性分析的准确度。基于聚合阻抗行列式稳定性判别方法,提出了构网型储能全工况振荡稳定性分析方法,给出了系统状态空间振荡稳定域内储能输出功率和短路比运行范围,同时考虑了不同控制参数对该稳定域的影响。理论分析和PSCAD仿真表明,所提方法能够准确判定次/超同步振荡范围内全工况运行条件下的稳定性,总结了短路比、输出功率、变流器控制参数对跟、构网型储能并网系统振荡安全域的影响特征,为规模化储能并网稳定性分析提供参考。Grid forming energy storage system can improve the sub/super synchronous oscillation(SSO)sta-bility of renewable energy units,but its stability characteristics under all operating conditions have not been explored.Aiming at this problem,a frequency coupled two-dimensional impedance model for grid forming energy storage grid-connected system is constructed.Compared with the traditional one-dimensional im-pedance model,the accuracy of SSO stability analysis is improved.Based on the stability discrimination method using aggregated impedance determinant,the oscillation stability analysis method for grid forming energy storage system under all working conditions is proposed.The operating range of energy storage out-put power and short circuit ratio(SCR)in the oscillation stability region of system state space is given,and the influence of different control parameters on the stability region are considered.Theoretical analysis and PSCAD simulation show that the proposed method can accurately analyze the SSO stability under all operating conditions.The influence characteristics of SCR,output power,and converter control parameters on oscillation stability region of grid-connected energy storage system based on grid following or grid forming control are summarized,providing references for the stability analysis of large-scale energy storage grid connection.

关 键 词：构网型储能 振荡稳定性 全工况 稳定运行范围 短路比 输出功率 控制参数 

分 类 号：TM712[电气工程—电力系统及自动化]