基于I-ω 响应关联特征的新能源电力系统暂态功角稳定判别方法  

Transient Angle Stability Discrimination Method of New Energy Power System Based on I-ω Response Correlation Characteristics

作　　者：刘铖[1] 李守超 张宇驰 张艳军 Liu Cheng;Li Shouchao;Zhang Yuchi;Zhang Yanjun(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education Northeast Electric Power University,Jilin 132012,China;State Grid Liaoning Electric Power Co.Ltd,Shenyang 110006,China)

机构地区：[1]东北电力大学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,吉林132012 [2]国网辽宁省电力有限公司,沈阳110006

出　　处：《电工技术学报》2024年第24期7902-7916,共15页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划资助项目(2021YFB2400800)。

摘　　要：基于响应驱动的暂态功角稳定分析方法具有不依赖模型和参数、计算量小、能够实时量测和实时判别等突出优势。首先,该文针对单机无穷大系统挖掘出发电机电流和角速度蕴含的暂态功角稳定信息,建立了故障后电流与角速度的关联关系,揭示了两电气量存在的暂态稳定性特征;其次,利用信息量测技术得到发电机电流与角速度的关系曲线,通过分析关系曲线特性,提取出系统功角稳定和功角失稳关键特征,并探究了风机接入后对关系曲线特性的影响,提出了一种暂态功角稳定新判据;最后,通过比较故障清除后机端母线电压相位差变化率的大小识别临界机群,将该文方法应用于多机系统暂态稳定性判别。仿真算例结果表明了所提方法能够简单快速地判断出暂态功角稳定态势。Compared with the traditional power system,the transient stability dynamic characteristics of the new energy power system have undergone profound changes after large disturbances,which makes the traditional transient stability analysis methods difficult to apply.With the development and improvement of wide-area measurement systems,scholars have proposed discriminant methods based on response information.However,most have the problems with cumbersome calculations,unclear physical meaning,and low accuracy.This paper proposes a transient power-angle stability discrimination method for new energy power systems based on the correlation characteristics of generator current and angular velocity.Based on the transient key characteristics contained in current and angular velocity,the transient power angle stability of the system is quickly and accurately discriminated.Firstly,the generator current is divided into three sections,and the difference characteristics of the post-fault current are obtained by comparing the current situation of each section in the two cases of power system stability and instability.Secondly,the post-fault current is substituted into the generator rotor motion equation to establish the relationship between the post-fault current and the angular velocity,and the relationship between the two electrical quantities and the transient stability is revealed.Thirdly,by analyzing the characteristics of the relationship curve between current and angular velocity,the key characteristics of transient power angle stability and instability are extracted,and the influence of wind turbine access on the characteristics of the relationship curve is explored.The transient power angle stability criterion is constructed.Finally,the critical generator cluster is identified by comparing the change rate of the phase angle difference of the bus voltage at the terminal after the fault is cleared.The simulations of the improved New England 10-machine 39-bus system and the actual power grid show that the critical generator

关 键 词：电力系统 暂态功角稳定 稳定判别 响应信息 关键特征 

分 类 号：TM712[电气工程—电力系统及自动化]