光学电压互感器中双光路不平衡及微弱信号检测的研究
针对光学电压互感器中常见的信号提取及双光路传输过程中存在的不平衡问题进行了研究。介绍了基于电光Pockels效应的光学电压互感器的基本原理，分析了系统中噪声的主要来源、微弱信号提取的难点以及双光路不平衡带来的系统误差。摒弃已经相对成熟的直流调制技术，改用交流调制来改善输出信噪比，给出了仿真框图，并将双光路不平衡差异考虑进去，提出了“低频处理，高频配平”的思想。仿真结果证明利用此方法可以适当地提高光学电压互感器的输出信嗓比。...
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| Published in | 电力系统保护与控制 Vol. 40; no. 3; pp. 31 - 35 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨,150001%哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨150001
2012
北京许继电力光学技术有限公司,北京100094%四川电力试验研究院,四川成都,610072 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1674-3415 |
| DOI | 10.3969/j.issn.1674-3415.2012.03.006 |
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| Summary: | 针对光学电压互感器中常见的信号提取及双光路传输过程中存在的不平衡问题进行了研究。介绍了基于电光Pockels效应的光学电压互感器的基本原理，分析了系统中噪声的主要来源、微弱信号提取的难点以及双光路不平衡带来的系统误差。摒弃已经相对成熟的直流调制技术，改用交流调制来改善输出信噪比，给出了仿真框图，并将双光路不平衡差异考虑进去，提出了“低频处理，高频配平”的思想。仿真结果证明利用此方法可以适当地提高光学电压互感器的输出信嗓比。 |
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| Bibliography: | HUO Guang-yu, ZHANG Guo-qing, YU Wen-bin , GUO Zhi-zhong, JIANG Bo （1. School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China; 2. Beijing Xuji Power Optics Technology Co., Ltd, Beijing 100094, China; 3. Sichuan Electric Power Test ＆ Research Institute, Chengdu 610072, China） This paper researches the common signal extraction of optical voltage transducer and the imbalance during the transmission of dual optical path, gives an introduction to the basic principle of optical voltage transducer based on electro-optic Pockels effect, and analyses the main source of noise in the system and the difficulty in extracting the weak signal and the system error resulted from the imbalance of dual optical path. Furthermore, instead of applying the mature DC modulation, it offers a method to improve SNR by AC modulation and additionally works out the simulation block diagram. Then considering the differences in the dual optical path which are imbalanced, it offers the idea of lo |
| ISSN: | 1674-3415 |
| DOI: | 10.3969/j.issn.1674-3415.2012.03.006 |