Fiber optic current sensors (FOCSs) are prone to environmental disturbances and have to be calibrated before going into service. A commonly adopted scheme is the single dimensional calibration method based on temperature. In this work, we propose a multi-dimensional FOCS calibration method based on the extreme gradient boosting (XGBoost) algorithm. Six operating parameters of the FOCS are chosen as the input of the calibration model, including the drive current of the light source, the average optical power of the photo detector (PD), the second harmonic of the PD output, the drive voltage of the piezoelectric transducer, the measured current, and the ambient temperature. The ratio error is acquired as the output. Temperature cycling experiments on three finished sensors in an environment of −40°C to 72°C are conducted. The experimental results show that the max absolute ratio error after multi-dimensional calibration based on XGBoost is 0.031% and the mean absolute ratio error is 0.003%, both of which are much lower than the single-dimensional calibration method based on temperature. It can be concluded that the proposed multi-dimensional calibration method based on XGBoost can effectively improve the accuracy and stableness of FOCSs.
In recent years, due to harsh working environments, increased accuracy requirements, and limited fiber optic technology levels, the active all-fiber optical current transformer (FOCT) used in the power grid of China State Grid is equipped with optical power compensation modules and modulation voltage compensation modules. However, aging of the light source (10 years) and extremely low temperature (-40℃) can cause the compensation modules to fail, resulting in decreased measurement reliability and significant losses to the power grid system. In this paper, by simulating the working status of FOCT when the power source ages and the modulator function deteriorates, it is found that the second harmonic and phase modulation depth are parameters that can timely reflect the working status of the optical power compensation module and the modulation voltage compensation module. This provides reference for the monitoring of feedback FOCT and helps improve the stability of feedback FOCT.
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