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Signal detection method and detection circuit of high-precision optical voltage transformer

An optical voltage and signal detection technology, applied in the direction of voltage/current isolation, etc., can solve problems such as poor dynamic response performance, inability to suppress white noise, and inability to meet

Active Publication Date: 2015-12-23
安徽华驰动能科技有限公司
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Problems solved by technology

The existing preamplifier is a broadband bandpass filter, which cannot suppress the white noise of the wide spectrum to achieve high-precision extraction of the closed-loop error signal
The closed-loop control algorithm in the existing signal processing unit is a simple integral algorithm, and such an integral algorithm cannot suppress the influence of optical power fluctuations on the dynamic performance of the optical voltage transformer; and such an integral algorithm cannot meet the requirements of the exponential stability condition Quickly track the transformation of the input signal, the dynamic response performance is poor, and it cannot meet the requirements of high-voltage and high-frequency measurement of power systems, such as applications that are difficult to meet switching impulse voltage and lightning pulse voltage

Method used

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  • Signal detection method and detection circuit of high-precision optical voltage transformer
  • Signal detection method and detection circuit of high-precision optical voltage transformer
  • Signal detection method and detection circuit of high-precision optical voltage transformer

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Embodiment Construction

[0094] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0095] The first step is to apply high-frequency carrier technology in the optical voltage transformer to avoid 1 / f (f represents frequency) noise, that is, to migrate the closed-loop error signal to the high-frequency region through square wave modulation. As shown in equation (1), term can be regarded as a square wave amplitude modulation. Assuming a closed-loop error signal The angular frequency of ω is 1 , expressing sinω in the form of an exponential function polynomial 1 t, then there is Where t represents time, and j is a unit imaginary number, then there is formula (3).

[0096] Frequency conversion is performed on the formula (3), that is, the interference light intensity v p (t) Perform Fourier transform, formula (3) can be expressed as formula (4).

[0097] image 3 (a) shows the modulated square wave f b The spectrogram of (t) ...

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Abstract

The invention discloses a signal detection method and circuit for a high precision optics voltage transformer and belongs to the technology field of an optics voltage transformer. The signal detection method and circuit for the high precision optics voltage transformer utilizes a band-pass filter of a narrow-band to replace the band-pass filter of a wide-band, utilizes a digital low pass filter and a control unit to replace a primary signal processing unit; and utilizes a robust control algorithm to obtain index stability during the signals detection process to improve the optics voltage transformer dynamic property which varies with the luminous intensity. The signal detection method and circuit for the high precision optics voltage transformer restrains white noises very well to obtain a closed loop error signal of high precision. By utilizing the detection method and circuit, the optics voltage transformer obtains + / - 0.2% precision, 24.5 kilohertz wide-band and 25.2 microseconds speediness step response which satisfy the application of electricity measuring and electricity protection fields.

Description

technical field [0001] The invention belongs to the technical field of optical voltage transformers, and relates to a signal detection technology and a hardware circuit realization method of high-precision optical voltage transformers. Background technique [0002] In order to improve the application performance of the closed-loop optical voltage transformer in engineering practice, it is necessary to analyze and suppress the factors that affect its detection accuracy and dynamic performance indicators. Compared with the open-loop system, although the impact of light intensity fluctuation on the accuracy of the closed-loop system is reduced, the light intensity is part of the gain of the forward channel of the closed-loop system, and the fluctuation of light intensity will still cause the gain change of the forward channel of the closed-loop system , thus affecting the dynamic performance of the optical voltage transformer. Moreover, since the closed-loop optical voltage tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/24
Inventor 李慧崔利阳赵宗涛李立京张春熹
Owner 安徽华驰动能科技有限公司
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