Development of high voltage harmonic measuring instrument system for distribution line using optical voltage and current sensor

在配电系统中越来越多地使用固态功率转换设备和其他电力型设备，导致公用事业公司越来越关注这些系统上的谐波电压和电流水平。同时配备功率变换器和功率因数改进电容器的配电系统特别容易出现电容器失效、通信电路干扰等问题。因此，在现场测试中，不仅需要使用常规的低压谐波分析仪测量配电变电所的谐波电平，还需要在配电线路上测量高压。尝试应用光学测量技术研制配电系统谐波电压电流测量仪器。为了开发一种以Bi12GeO20晶体为传感电池的高压配电网谐波电压测量系统，采用氧化锌元素作为电压传感器。采用R3Fe5O12薄膜作为法拉第器件，在谐波电流测量系统的基础上改进了光学电流传感器系统。并与传统谐波分析仪的测试结果进行了比较。结果表明，所研制的高压谐波测量装置在实际应用中表现出良好的性能。采用高压光学谐波测量仪和低压光学谐波分析仪对某工业配电线路进行了现场测试评价。同时也证实了某通信工厂附近配电线路现场试验点的谐波电压水平高于同一配电变电所。在谐波源检测的第一阶段，利用反向传播算法确定的神经网络对谐波负荷组成比进行仿真。少

The increasing use of solid-state power-conversion equipment and other power electric-type devices on power distribution systems is causing utilities to become much more concerned about harmonic voltage and current levels on these systems. A power distribution system equipped with both power converters and power-factor-improvement capacitors is especially vulnerable to capacitor failure, communication circuit interference and so forth. Thus, it is necessary not only measure harmonic levels at the distribution substation by using the conventional harmonic analyzers for low voltage, but also to measure on the distribution lines for high voltage in field test.Application of optically measuring techniques was attempted to develop harmonics voltage and current measuring instruments for distribution systems. To develop the harmonics voltage measuring system using a Bi12GeO20 crystal as a sensing Pockels cell for high voltage distribution lines, zinc oxide elements were adopted as a voltage d … More ivider. An optical current sensor system was improved on the harmonics current measuring system using a R3Fe5O12 film as a Faraday device. The results of the field test by means of the these optical voltage and current sensor systems for high voltage were compared with the them of conventional harmonics analyzers.As a result, it was confirmed that the developed high voltage harmonics measuring devices showed successfully good characteristics in practical use. The field test evaluation was performed with optical harmonic measuring instruments for high voltage and harmonic analyzers for low voltage in an industrial distribution line. Also, it is confirmed that the harmonic voltage level at the field test location in distribution line in the neighborhood of a communication factory is higher than that in the same distributing substation. At the first stage to detect harmonic sources, the simulation of constituent ratio of harmonic loads was tried with the neural network determined by the back propagation algorithm. Less