Abstract
A closed-loop detection system is established to make optical voltage
sensors (OVSs) based on Pockels effect particularly ideal for high-voltage
applications. For the closed-loop OVSs, the signal intensity fluctuation due
to temperature variation contributes to the gain drift of the forward channel
and finally influences the dynamic performance of the OVSs. Meanwhile, the
closed-loop error of the OVS is also a weak signal that is hard to be accurately
extracted. In this work, we propose a signal detection circuit based on weak
signal detection theory to reduce noise levels for improving detection accuracy
of OVS. In consideration of the influence of signal intensity fluctuation,
we design a control algorithm for the closed-loop detection system to guarantee
that the OVS is exponentially stable in order to have a fast dynamic response.
The experimental results show that the OVS based on the proposed closed-loop
system has accuracy within 0.2%, a fast rise time less than 25.2 μs and
a wide bandwidth up to 24.5 kHz.
© 2013 IEEE
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