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A Noise and Disturbance Suppression Method of Optical Voltage Sensor Based on Double Closed-loop Detection

A double-closed-loop detection and optical voltage technology is applied in the direction of measurement using digital measurement technology, which can solve the problems of unclear double-closed-loop noise and disturbance models, difficulty in improving the measurement accuracy of optical voltage sensors, and reducing the detection accuracy of optical voltage sensors. Achieve the effect of suppressing double-closed-loop cross-interference and satisfying the stability of the mean square index

Active Publication Date: 2016-03-23
安徽华驰动能科技有限公司
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Problems solved by technology

[0003] However, while the four-state modulation realizes the real-time fast closed-loop of the double-closed-loop detection loop, it also introduces the crosstalk of the double-closed loop, which greatly reduces the detection accuracy of the optical voltage sensor; and the digital closed-loop detection scheme makes the optical voltage sensor closed-loop While the signal is at the zero point, the closed-loop error signal becomes a weak signal with a lot of noise. In addition, the cross-interference in the double-closed-loop dynamic tracking process using four-state modulation technology makes the realization of high-precision optical voltage sensor a very difficult task. big challenge
Especially due to disturbance, noise and other reasons, it is difficult to improve the measurement accuracy of optical voltage sensors
In particular, the double closed-loop noise and disturbance model based on four-state modulation technology is unclear (no reports at home and abroad), and it is difficult to optimize the closed-loop detection algorithm, which restricts the development of high-precision optical voltage sensors

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  • A Noise and Disturbance Suppression Method of Optical Voltage Sensor Based on Double Closed-loop Detection
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  • A Noise and Disturbance Suppression Method of Optical Voltage Sensor Based on Double Closed-loop Detection

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Embodiment Construction

[0037] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0038] combine figure 1 , the working principle of the closed-loop optical voltage sensor based on the Pockels effect is: the light emitted by the superluminescent diode (SLD) reaches the polarizer through the beam splitter and is polarized into linearly polarized light, and the linearly polarized light is averaged at the 45° opposite axis fusion Divided into two beams of orthogonal linearly polarized light into the phase modulator, the phase modulator provides modulation and feedback signal phase shift; non-reciprocal Faraday rotator rotation angle is 45 °, BGO crystal (Bi 4 Ge 3 o 12 ) converts the measured voltage signal into Pockels phase shift and returns. Linearly polarized light travels back and forth twice along the quasi-reciprocal optical path, so the phase difference of the interfering light intensity at the polarizer is twice the Pocekl...

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Abstract

The invention discloses a noise and disturbance inhibition method for an optical voltage sensor based on dual closed-loop detection, belonging to the technical field of fiber voltage sensors. The method comprises that a mathematic model of an optical voltage sensor system is established based on a four-mode modulation technology; a state equation and a dynamic equation of the system are established; and a feedback gain matrix Kc is determined, so that the optical voltage sensor closed-loop system satisfies the index stability. Based on the four-mode modulation technology, the method combines influential factors which influence the detection precision for the optical voltage sensor to provide a robustness control scheme, so that cross interference between two closed loops can be realized, and the optical voltage sensor can be widely applied to power systems.

Description

technical field [0001] The invention belongs to the technical field of optical fiber voltage transformers, and in particular relates to a method for suppressing noise and disturbance of an optical voltage sensor based on double closed-loop detection. Background technique [0002] The digital closed-loop detection scheme enables the closed-loop feedback signal of the optical voltage sensor and the closed-loop input signal to improve the linearity of voltage measurement at the zero point of the nonlinear sinusoidal interference light intensity signal, and solves the influence of light source power fluctuations on the scale factor, achieving a large Dynamic range and excellent bias stability. However, when the ambient temperature changes, the modulation coefficient of the phase modulator of the feedback execution unit will change accordingly, affecting the measurement accuracy, scale factor linearity and repeatability of the optical voltage sensor. In order to accurately track...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25
Inventor 李慧赵宗涛崔利阳张春熹李立京
Owner 安徽华驰动能科技有限公司
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