电力系统暂态变量的Prony分析  

Prony Analysis of Power System Transient Variables

作　　者：曹维[1] 翁斌伟[1] 陈陈[1] 

机构地区：[1]上海交通大学电力系,200030

出　　处：《电工技术学报》2000年第6期56-60,共5页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目!(69774003)。

摘　　要：电力系统暂态过程中，各类变量由衰减直流分量与衰减交流分量(基波，谐波)组成。确定暂态信号中的各分量对电力系统控制和保护至关重要。Prony分析可以直接提供按指数规律衰减信号中各种分量的频率和幅值，更切合电力系统暂态变量的特点，并可用最小二乘法得到高精度的拟合。本文采用两个算例来说明该方法的有效性，第一个算例对石洞口二厂600MW汽轮发电机静止励磁系统实测阶跃响应进行Prony分析并作误差分析，第二个算例对发电机空载三相短路电流进行Prony分析，得到短路电流各分量。Power system variables during transient proces s are composed of damped DC components and damped AC components(fundamental wave and ha rmonics).It is especially important to identify all modes of the transient signa l for power system control and protection. Prony analysis, superior to conventio nal Fourier method, can directly estimate the frequency and magnitude of all mod es which damp exponentially. Such method is more suitable to the character of po wer system transient variables and can produce high accuracy fitting by least square means. This paper implemented Prony method on the step response of static excitation system and three phase short circuit analysis of synchronous machine.

关 键 词：电力系统 暂态变量 PRONY分析 数字信号处理 

分 类 号：TM711[电气工程—电力系统及自动化] TM712