Abstract
In engineering practice, the closed-loop optical voltage sensor (OVS) based on Pockels effect cannot
reach the required precision level mainly due to the various disturbance and noise of system, so the application of
OVS for low voltage measurement is restricted. Considering the cross coupling of the main and second closed-loops, the
model of disturbance and noise of system that adopts the four-state modulation method is analyzed in the main
closed-loop of OVS. Based on the established noise-perturbed stochastic model of OVS, we design a closed-loop
detection algorithm for the OVS system to guarantee the mean-square exponential stability with a prescribed
$H_\infty$
performance in order to optimize the detection precision
of OVS. The experimental results show that the detection precision of OVS is 0.144 V while the relative
measurement error of the scale factor is within ± 0.15% in measuring low AC voltages from 140 to
500 V, which verifies the effectiveness of the proposed detection scheme.
© 2013 IEEE
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