电力系统动态等值中发电机组详细模型的参数集合

Aggregation of Generating Unit Parameters in the System Dynamic Equivalents

电力系统动态等值包括相关机群动态识别,系统简化和相关机群参数集合三部分。本文着重研究第三部分的数学模型和参数集合方法,给出一种相关机群详细模型参数集合的新算法。这种新算法是以最小二乘法曲线拟合为基础,采用奈魁斯特和尼柯尔斯两种形式的目标函数。应用模矢搜索法获得一组拟合效果最优的等值发电机组详细模型参数。这种方法的依据是通过相关机群和等值机之间在频率域过渡响应相似来达到在时间域过渡响应相似。算例的结果表明这种算法简单,计算速度快,精度能满足工程计算要求,非常适合于复杂电力系统暂态稳定和动态稳定分析中的动态等值参数集合。也可用于并联运行在同一母线上多个发电机的详细模型参数集合。

In this paper, A new technique for aggregation of coherent generating unit parameters is presented. The Parameters of equivalent model are numerically adjusted to obtain a minimal error function (objective function) by means of the Hooke-Jeeves pat-tern search. There are two kinds of eorror function- One kind of error function is the error between the Nyquist plot (polar coordinates plot) of equivalent units and the sum of the coherent generating units, for specified discrete frequencies. The other kind of error function is the error between the Nichols plot of them.The test is separately completed with the Bode plots of every model for the hydro units and the steam units. The valid tests show that primary advantage of the procedure presented is fast and acturats.