线性连续系统动态负荷模型的参数辨识与应用

目前在电力负荷建模中非机理负荷模型较多地采用离散系统模型或差分方程形式的模型,而电力系统数字仿真中更需要连续系统的模型。研究了作用函数不含导数项和含有导数项两种情况下的线性连续系统微分方程形式的负荷建模方法,介绍了模型参数辨识的直接优化算法,该模型对于描述线性动态负荷或小扰动下的非线性动态负荷的行为,具有一定程度的普适性。介绍了该动态负荷模型与电力系统分析综合程序PSASP的自定义连接方法。通过动模实验数据建模和仿真计算,验证了模型参数辨识算法以及模型与电力系统分析综合程序接口的有效性。

Parameter estimation and application of dynamic load model with linear continuous-time signal form

The load models with discrete-time signal form or difference equation form are widely used in non mechanics load modeling currently. But the load model with continuous-time signal form is specially required in power system digital simulation. For two cases which the differential item is included or not in the excitation function, the linear continuous-time signal system load models with the form of differential equation are studied respectively in this paper. The direct optimization algorithm for parameter estimation is introduced. These models have a wide range of applications in describing the characteristics of linear dynamic load and non linear dynamic load under small signal turbulence. The method for linear continuous-time signal system model connected to the power system analysis software package (PSASP) by using the user definition function is described. The validity of proposed parameter estimation algorithm is proved by the examples of load modeling based on the measurement data, and the interface also proves to be valid for the model connected to PSASP.