基于实时戴维南等值参数估计的短路比分析  

Short Circuit Ratio Analysis Based on Real-time Thevenin Equivalent Parameter Estimation

作　　者：刘洪波 刘庸 高旭升 陈欣悦 林继巍 Liu Hongbo;Liu Yong;Gao Xusheng;Cheng Xinyue;Lin Jiwei(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology(Northeast Electric Power University),under Ministry of Education,Jilin Jilin 132012,China)

机构地区：[1]现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林吉林132012〕

出　　处：《电气自动化》2024年第1期70-74,共5页Electrical Automation

基　　金：国家电网有限公司总部管理科技项目(5100-202226021A-1-1-ZN)。

摘　　要：针对风电接入多场站电力系统暂态稳定问题,依托短路比对系统的暂态稳定性进行判定。首先,建立新能源并网系统等效模型,运用时域仿真的戴维南等值参数法来求解系统暂态的戴维南等值参数;在此基础上,计算交流系统短路容量,推导得出新能源并网系统短路比,并构建短路比与节点电压的代数关系,得到系统短路比关于节点电压的计算式;最后,基于系统最大传输功率计算得出临界短路比,通过对比实现对系统暂态稳定的实时评估。仿真结果表明,基于时域仿真的戴维南短路比计算准确,算法的适应性强。当短路比小于临界短路比时,系统处于特性不稳定区域,反之则处于稳定区域。A method for determining the transient stability of wind power connected to multi station power systems based on short-circuit comparison was proposed.Firstly,an equivalent model was established for the new energy grid connected system,and the Thevenin equivalent parameter method was used for time-domain simulation to solve the transient Thevenin equivalent parameters of the system;on this basis,the short-circuit capacity of the AC system was calculated,the short-circuit ratio of the new energy grid connected system was derived,and an algebraic relationship between the short-circuit ratio and node voltage was constructed so as to obtain the calculation formula of the system short-circuit ratio regarding node voltage;finally,the critical short circuit ratio was gained based on the maximum transmission power of the system,and the real-time evaluation of system transient stability was achieved through comparison.The simulation results show that the Thevenin short-circuit ratio calculation based on time-domain simulation is accurate and the algorithm has strong adaptability.When the short-circuit ratio is less than the critical short-circuit ratio,the system is in the characteristic unstable region,while it is in the stable region on the contrary.

关 键 词：戴维南等值 新能源并网 暂态稳定 短路比 临界短路比 

分 类 号：TM76[电气工程—电力系统及自动化]