复杂动态负荷电流幅度域典型游程波形模态与特征提取

Extraction of Typical Run Length Waveform Modes and Characteristics of Complex Dynamic Load Current Amplitude Domain

针对复杂动态电能信号幅度域特征认识不足、波形域特征不清楚、信号样本不足、不能综合表征复杂动态电能信号的强随机特征的问题,对于实际电网中的3种典型复杂动态电能信号,首先,建立离散数学模型;然后,提出对电能表大误差敏感的幅度域重要特征参量及表征算法;其次,采用全遍历与电流幅度域游程波形模态主成分分析方法,提取6类典型游程波形模态,据此,构建复杂动态负荷电流特征波形样本库;最后,提出补充国际和国内标准试验点的建议,为解决目前国际和国内标准试验点不足提供了依据。

Aiming at the lack of the amplitude and waveform domain characteristics for complex dynamic load due to the insufficient signal samples,there has not been a suitable method to present the comprehensive characteristics for the strong random complex dynamic load signals.In this paper,firstly,a discrete mathematical model is established for the three kinds of typical dynamic loads in power grid.Secondly,the important characteristic parameters and their algorithms are proposed.Then,6 typical run waveform modes are extracted by mean of the full ergodic and principal component analysis for the current amplitude domain run waveforms.Base on waveform modes,a characteristic current waveform sample library is established.Finally,a suggestion is given for supplementing the international and domestic electricity meter standard in order to privide a reference for the insufficient test points for testing the dynamic errors of the electricity meters.