OCT Signal Processing Method Based on Sequential Kalman Filtering

Abstract:

Optical current transformer (OCT) measured current signal which is mixed with strong random noise. The measured readings can’t accurately reflect the value of the measured current. Since the optical current transformer noise inside the band is basically where the measured current signal overlap,we can not use the traditional method to filter it out. This paper describes the measurement principle based on the Faraday effect of optical current transformer and signal to noise characteristics. Considering optical current transformer for low SNR characteristics, and embedded systems do not have the characteristics of a matrix library, we proposed using sequential Kalman filter to improve the real-time output signal to noise ratio. In the measured current for DC and AC conditions,we established an appropriate state space model Kalman filter.,and conduct simulation on matlab. Practice shows that the sequential Kalman filter algorithm can effectively improve the output signal to noise ratio and accuracy.

• Periodical: Advanced Materials Research (Volumes 1092-1093)
• Pages: 300-303
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1092-1093.300
• Online since: March 2015
• Authors: Yu Heng Yan*, Yan Song Li
• Keywords: OCT, Sequential Kalman Filtering, Signal to Noise Ratio

References

[1] Zhang Kewei，WangNing，DuanXiongying，etal．A digital integrator for electronic current transducer[J]．Proceedings of the CSEE，2004，24(12)：104-107(in Chinese).

[2] Liu Ye，WangCaitang，SuYanmin，etal．Development of study of optical current transducer used in power system[J]．Automation of Electric Power Systems，2000，24(17)：60-64(in Chinese).

[3] Li Yansong，ZhangGuoqing，YuWenbin，etal．Adaptive optical current transducer[J]．Proceedings of the CSEE，2004，24(12)：104-107(in Chinese).

[4] Dan Simon．Optimal state estimation kalman, H∞, and nonlinear appoaches[J] ． National defence industry Press，2006．(in Chinese).