清华大学动态电力系统课件（英文版）7.ppt

动态电力系统 张 毅 威 ywzhang@ 西主楼 III-210 电话Ftp：0 Chap.12 Small-signal Stability What is small signal stability Two Kinds of it .lack of synchronizing torque .lack of sufficient damping 12.1 Fundamental concepts of stability of dynamic systems 12.1.1 State-space representation Concept of State State variables Initial condition Trajectory Equilibrium (or singular) points Linear system: one EP Non-linear system: possible multi EP 12.1.2 Stability of a dynamic system Stable Linear system Non-linear system: 扰动类型，大小，初始值 local stability (stability under small disturbance) finite stability global stability 12.1.3 Linearization characteristics equation eigen-value 12.1.4 Analysis of stability 李氏第一方法 李氏第二方法 12.2 Eigen-property of the state matrix 12.2.1 Eigen-values 12.2.2 Eigen-vectors 右特征向量 左特征向量 12.2.4 Free Motion of a Dynamic System formula 12.43 and its comments(p711) Eigen-value and stability 12.2.5 Mode shape, sensitivity and participation factor Mode shape and eigen-value Eigen-value sensitivity Participation factor 12.2.6 Controllability and Observation 12.4 Effects of Excitation System Damping characteristics are mainly affected by gain 12.5 PSS The basic function 12.7 Small-signal Stability of multi-machine systems 12.8 Special Techniques for analysis of very large systems 12.9 Characteristics of Small-signal stability problems Local model (more often) Single-machine infinite bus system A generator to the rest of system A plant to the rest of system An element to the rest of system Global model Low frequency mode High frequency mode Factors Type and locations of the exciters Characteristic of loads Governors ?? Solutions PSS study Location Characteristics and location of loads Types of exciters on other units Chap.13 Transient Stability 大扰动 大波动 功角稳定 factors influencing transient stability 发电机初态 故障中出力 故障时间 故障后线路阻抗 发电机阻抗 发电机惯性常数 发电机内电势 系统电压 13.2 数值积分法 数值稳定性 隐式积分法 13.3 Simulation of power system dynamic response Structure of model Sync