谐波对电网中有功计量装置的影响

Analysis on Affects of Harmonics on Active Energy Metering Devices

随着非线性负荷的广泛应用,电网谐波污染日益严重。电力系统中使用的计量用互感器、有功电能表大多针对工频正弦波设计,畸变波形对其计量准确度产生了不同程度的影响。基于有功计量装置的频率响应特性分析了电力谐波对不同计量装置的误差影响情况,并提出了目前电网有功计量方式的问题和建议。

Along with the wide application of nonlinear power electronic devices in power grids, harmonic pollution in power systems becomes more and more severe. Most instrument transformers and watthour meters installed in power systems are designed to measure power frequency signals with sinusoidal waveform, the measurement accuracy of these measuring devices will be affected by distorted waveform to a certain extent. Based on the frequency response characteristics of active power measuring devices, the affects of harmonics on measurement error of different kinds of measuring devices are analyzed, and the defects of existing active power measurement mode are pointed out and related suggestions are given.