光学互感器谐波准确测量仿真研究

Simulation Technology Study on Harmonic Measurement of Transformer Based on Optical with MATLAB

谐波会造成电网内设备故障,影响电力的正常传输,所以谐波测量及治理非常重要。互感器的输出特性决定了谐波测量的准确度。为了准确测量谐波,提出将傅里叶算法应用于光学互感器谐波测量并设计了仿真系统。以光学电压互感器为研究对象,主要分析了光学电压互感器的结构、测量原理并建立了数学模型;研究了傅里叶算法及其在谐波测试中的应用;设计了光学电压互感器谐波测量的MATLAB仿真系统。通过仿真得到各次谐波电压的幅值和谐波畸变率,结果表明上述仿真系统在误差允许范围内用于谐波分析可以准确地测量各次谐波幅值及畸变率。

The failure of equipment and the abnormal transmission of electricity whin Grid are caused by harmon- ic, so it is important to measure and control harmonic. The harmonic measurement accuracy depends on the output characteristic of transformer. This paper first proposed the idea that applying the Fourier algorithm to harmonic meas- urement of Optids transformer and designed the simulation system. Taking OVT for example, the principle on voltage measurement of OVT and the mathematical model and the relation between voltage and the output light intensity were discussed. Fourier series and its application were presented. The MATLAB simulation system of optical voltage trans- former used in harmonic measurement was described. The simulation results that indicate amplitude and distortion of harmonic voltage can be measured accurately by the MATLAB simulation system in the range of allowable error.