MOA在线监测中间谐波的影响分析

Analysis of Effect of Interharmonics on MOA's On-Line Monitoring

阻性泄漏电流基波和3次分量是反映MOA劣化现象的两个故障特征量,仿真分析对此问题及间谐波电压对阻性泄漏电流的影响。发现系统中间谐波电压使故障特征量的测量误差较大,不同频率的间谐波对故障特征量的影响也不同。最后基于谐波分析法和相量法的结合,建立了消除相间干扰和电网谐波(含间谐波)影响的MOA在线监测动态的数学模型。

Resistive first-harmonic current and third-harmonic current are the two fault eigenvectors reflecting MOA's aging phenomenon. In this paper, simulation is made to show the effect on the eigenvector and resistive leakage current under interharmonics of different frequency. Based on harmonic and vector analytical method, a MOA's online monitoring model is established to eliminating the effect of inter-phase interference and harmonics, including interharmonics.