通用动态负荷模型电压阶跃检测和参数辨识方法

发布时间：2018-05-27 14:35

本文选题：通用动态负荷模型 + 电压等效阶跃点　；参考：《电网技术》2014年09期

【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。
[Abstract]:How to determine the equivalent step position of the gradual voltage signal and how to adopt the reasonable signal preprocessing method have important influence on the parameter identification of the general dynamic load model. To meet the need of dynamic load modeling test, the equivalent voltage step is used to replace the voltage gradient signal, and the clustering analysis is introduced into the detection of equivalent voltage step point. Considering the distribution characteristic of voltage value in a certain time range, combined with wavelet denoising to pre-process load signal, based on MATLAB platform and with the help of GUI (graphical user Interface) development method, the parameter identification of general dynamic active load model is realized. The experimental results show that using the clustering analysis method, the step point detection of the gradual voltage signal after the mean filter and wavelet denoising can be realized effectively, and the parameter identification of the signal with bior3.7 wavelet 4 layer decomposition and denoising can be carried out. The stability is the best. This method is suitable for load modeling and off-line analysis with power recovery characteristics under the condition of gradual voltage change caused by manual change of transformer tap position.
【作者单位】：沈阳农业大学信息与电气工程学院;
【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)~~
【分类号】：TM714

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