感应电动机负荷模型特性的研究.pdfVIP

感应电动机负荷模型特性研究 赵勇 中国南方电网有限责任公司电网技术研究中心 STUDY ON CHARACTERISTICS OF INDUCTION MOTOR MODELS ZHAO Yong China Southern Grid Technology Research Center, Guangzhou, 510623, China ABSTRACT ：Static and dynamic characteristics of induction motor models have great influence on stability of power systems. In this paper, based on the fundamental equations of induction motor models, the static and dynamic characteristics are studied detailedly. Induction motor models have four different types of static s-u, p-u and q-u curves, corresponding to one certain terminal voltage, an induction motor model may have 1, 3, or 5 possible operation points, which can moreover be classified into stable or unstable; when the terminal voltage varies, the operation points may shift according to different trajectories in the curve of static characteristics; when a sudden rise or drop occur at the terminal of an induction motor model, firstly the motor may act as a constant impedance and constant current combined characteristic at this moment, secondly it will move according to its electromagnetic torque curve, and finally, it will arrive at one certain operation point in the static characteristic curve. Some issues on load modeling are discussed and a viewpoint is proposed that when establishing a simplified model to represent a real composite load, the simplified model must approximate the real load well both in dynamic and static characteristics. This paper will contribute to the basis of the study of load models. 摘要：感应电动机负荷模型的静态和动态特性对于电力系统稳定性具有重要的影 响。本文基于感应电动机负荷模型的基本方程，对其静态和动态特性进行了全面深 入的研究。感应电动机的静态 s-u 及 p-u 、q-u 曲线具有4 种基本的类型，在一定电 压范围内，电动机将可能有 1、3 或 5 个运行点与一个端电压相对应，且其中有稳 定的运行点和不稳定的运行点；静态特性曲线上端电压升高和降低时，电动机运行 点的变化轨迹可能不同；端电压突变瞬间，电动机将