通用动态负荷模型电压阶跃检测和参数辨识方法  

Voltage Step Point Detection and Parameter Identification of General Dynamic Load Model

作　　者：王立地[1] 何昕[1] 朴在林[1] 

机构地区：[1]沈阳农业大学信息与电气工程学院,辽宁省沈阳市110161

出　　处：《电网技术》2014年第9期2479-2483,共5页Power System Technology

基　　金：国家科技支撑计划项目(2012BAJ26B01);辽宁省自然科学基金项目(201202191)~~

摘　　要：如何确定渐变电压信号等效阶跃点位置和采取合理的信号预处理方法对通用动态负荷模型参数辨识有重要影响。针对动态负荷建模试验的需要,利用等效电压阶跃来代替电压渐变信号,把聚类分析引入等效电压阶跃点检测中。在一定时间区间内考虑电压数值的分布特性,结合小波去噪进行负荷信号预处理,基于MATLAB平台,借助GUI(图形用户界面)开发手段,实现了通用动态有功负荷模型的参数辨识。实验结果表明:采用聚类分析方法,可以有效实现经均值滤波和小波去噪处理后的渐变电压信号的阶跃点检测;利用bior3.7小波4层分解去噪的信号进行参数辨识,结果稳定性最好。该方法适用于由于手动改变变压器分接头位置等引起的电压渐变条件下具有功率恢复特性的负荷建模和离线分析。It is of significance for parameter identification of general dynamic load model to determine the position of equivalent step point in gradually-varying voltage signal and adopt reasonable signal preprocessing method. To meet the requirement of the dynamic load modeling experiment, the equivalent voltage step is adopted to take the place of gradually varied voltage signal, and the clustering analysis is led into the detection of equivalent voltage step point. Considering distribution characteristic of numerical value of voltage in a certain time interval and combining with wavelet denoising, the load signal is preprocessed; based on the platform of MATLAB and by means of development tool of graphics user interface （GUI） the parameter identification of general dynamic active load model is implemented. Experimental results show that, with the clustering method, the gradually-varying voltage step point can be effectively detected on the basis of the signal processed by average filtering and wavelet denoising; and utilizing the signal denoised by bior3.7 wavelet with the 4-th level decomposition for parameter identification, the obtained result is of the highest stability. The proposed method is suitable for load modeling with power recovery characteristic and off-line analysis under the condition of gradually-varied voltage due to manually changing the position of transformer tap and so on.

关 键 词：通用动态负荷模型:电压等效阶跃点 聚类 小波 

分 类 号：TM721[电气工程—电力系统及自动化]