一种基于扰动能量与功率谱的电容器组投切的定位方法

Location Method for Capacitor Bank Switching Based on Disturbance Energy and Power Spectrum

由于部分无功补偿装置本身的不成熟,容易产生误动现象,因此定位多条母线处的投切电容器组具有重要意义。以2条母线处电容器同时投切为研究对象,提出了一种利用扰动能量与功率谱作为特征,支持向量机作为智能分类器的定位方法。该方法首先使用扰动能量第一峰值的极性及其大小,判断电容器投切的主要区域;接着对区域内部分监测点的监测电压进行功率谱估计,计算所提出的2个特征指标;最后将这些特征量输入支持向量机,得到电容器投切的位置。在PSCAD/EMTDC中建立了简单配电网模型,仿真不同位置的电容器投切,测量母线电压暂态数据,所得数据导入Matlab进行处理,仿真结果表明,该方法对判定两两同时投切电容器组的位置具有较好的适应性,平均识别精度达到98.6%。

Due to the imperfect of some reactive compensation installations, the misoperation is prone to occur, thus, locating the switching capacitor bank on multiple buses has the great significance. An efficient location method on two different buses in distribution system is presented using disturbance energy （DE） and power spectrum （PS） as the features and support vector machine （SVM） as intelligent classifier. In this method, firstly, the numerical value and polarity of DE are utilized to determine main area of capacitor switching; then, the PS of voltages from the partial measurement points are estimated and two self - proposed feature indices are calculated ; finally, the location of capacitor switching can be obtained by inputting the feature indices into SVM. A simple distribution network model is established in PSCAD/EMTDC, then, the transient bus voltage are measured by simulating the capacitor switching at different locations, and the output signals are put into Matlab for processing. The results show that the proposed method has a good adaptability for locating switching capacitor bank on two different buses, whose average accuracy reaches 98.6%.