一种基于转速差–功角差变化趋势的暂态功角稳定辨识方法  

An Identification Method for Power System Transient Angle Stability Based on the Trend of Rotor Speed Difference-rotor Angle Difference

作　　者：顾卓远[1] 汤涌[1] 孙华东[1] 刘楠[2] 秦晓辉[1] 张妍[3] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192 [2]国家电网公司,北京市西城区100031 [3]北京市电力公司,北京市西城区100031

出　　处：《中国电机工程学报》2013年第31期65-72,8,共8页Proceedings of the CSEE

基　　金：国家电网公司大电网重大专项资助项目课题(SGCC-MPLG001-2012)~~

摘　　要：为实现基于响应的电网暂态稳定实时分析,提出一种基于相平面上转速差—功角差变化趋势辨识电网暂态功角稳定性的方法。以单机无穷大系统为例研究并证明了转速差–功角差变化趋势与暂态功角稳定的关系,从而揭示了机械动能与电势能相互转化时系统维持同步运行的表现形式。针对多机系统,利用双机等值思想进行推广应用。为克服虚拟的等效惯量中心计算得到的运动轨迹一阶导数并不平滑的缺点,采用最小二乘法将其拟合成二次函数抛物线形式,判断其变化趋势,从而识别系统暂态稳定性。通过单机无穷大系统和新英格兰10机39节点系统算例,验证了所提方法的准确性。计算仅使用发电机的功角和转速量,方便、简洁、快速,具有良好的应用前景。In order to realize the response-based real-time transient stability analysis of power system, a new identification method is proposed, which is based on the trend of rotor speed difference-rotor angle difference. Firstly, a one-machine infinite bus system （OMIB） is used to discuss the relationship between the trend of rotor speed difference-rotor angle difference and transient stability, and indicate the system stability behavior in the inter-conversion of mechanical and electrical energy. Furthermore, this idea is applied to multi-machine system by single machine equivalent （SIME） method. In order to overcome the defect that the first-order partial derivative of the trajectory is unsmooth, the least square method is adopted. The accuracy and effectiveness of the proposed method are demonstrated based on one-machine infinite bus system and New England 10-generator 39-bus system. Needing only the rotor angle and rotor speed of generators, the proposed method is convenient, concise and fast, with good application prospects.

关 键 词：暂态稳定 广域测量系统 轨迹趋势 单机无穷大系统 实时监测 

分 类 号：TM71[电气工程—电力系统及自动化]