Abstract
The influence of optical parameters on the performance of closed-loop optical voltage sensors (OVSs) based on Pockels effect is analyzed and a control algorithm is proposed to suppress the nonlinearity caused by the unideal parameters of optical devices for optimizing the detection precision of OVSs. First, a quantified model of the feedback phase demonstrates how the optical parameters of optical devices (including light source, polarizer, 45° fusion point, Faraday rotator and half-wave plate) result in the nonlinearity of closed-loop OVSs. Then, the parameter indexes of different optical devices are put forward to instruct the manufacturing process of the optical system. Furthermore, a closed-loop control algorithm is investigated to improve the measurement accuracy of nonlinear OVSs considering the unideal parameters. The experiment results indicate that additional bias caused by undesirable optical parameters is obviously decreased so that the measurement accuracy of OVSs satisfies the demand of IEC60044-3 for 0.1 level measurement accuracy, which verifies the effectiveness and correctness of the methods for suppressing the impact of unideal optical parameters on OVSs.
Highlights
Optical voltage sensors (OVSs) are receiving increased attention as a key component of power systems, owing to the advantages of their small size, light weight, high bandwidth, safety, intrinsic immunity to electro-magnetic interference and so on [1,2]
The scheme of multi-optical devices enhances the reciprocity of the optical system based on a dual-crystal structure, but the cross-effect of multi-parameters makes it difficult to improve the accuracy of the OVS, especially in practical engineering
We investigate the quantification model of the feedback phase of a closed-loop OVS, considering the unideal optical parameters
Summary
Optical voltage sensors (OVSs) are receiving increased attention as a key component of power systems, owing to the advantages of their small size, light weight, high bandwidth, safety, intrinsic immunity to electro-magnetic interference and so on [1,2]. Plate θ and rotation angle of Faraday rotator ν cause the difficulty in improving the detection accuracy of OVSs, so that the closed-loop control algorithm is very important in suppressing the fluctuation of the rotation angle ν and the delay angle θ belong to the intrinsic parameters of optical optical parameters for improving the measurement accuracy of OVSs. 2017, 16, 1723may devices, which change with temperature or other environmental factors. The unideal phase delay angle of half-wave plate θ and rotation angle of Faraday rotator ν cause the difficulty in improving the detection accuracy of OVSs, so that the closed-loop control algorithm is very important in suppressing the fluctuation of optical parameters for improving the measurement. The unideal phase delay angle of half-wave plate θ and rotation angle of Faraday rotator ν cause the difficulty in improving the detection accuracy of OVSs, so that the closed-loop control algorithm is very.
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