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A Realization Method of Digital Integrator Based on Impulse Response Fitting of Ideal Reconstruction Filter

A technology for reconstructing filters and digital integrators, which is applied in the field of digital integrators, can solve the problems that the accuracy cannot meet the requirements, and achieve the effect of high integration accuracy

Inactive Publication Date: 2017-09-08
CHANGZHOU UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in order to overcome the deficiency that the accuracy of the existing digital integrator cannot meet the demand when the Rogowski coil current transformer measures higher harmonics, the present invention provides a simulation based on the ideal reconstruction filter impulse response The integrated digital integrator adopts the offline calculation of the integral of the impulse response of the ideal reconstruction filter, and calculates the signal integral by weighting and summing the signal sampling values, which can improve the accuracy of the integration and is suitable for complex environments where the measured current contains high-order harmonics

Method used

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  • A Realization Method of Digital Integrator Based on Impulse Response Fitting of Ideal Reconstruction Filter
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  • A Realization Method of Digital Integrator Based on Impulse Response Fitting of Ideal Reconstruction Filter

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Embodiment Construction

[0015] The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0016] The digital integrator implementation method based on ideal reconstruction filter impulse response fitting of the present invention comprises the following steps:

[0017] (1) Offline calculation coefficient n=0,1,2,...; T is the sampling interval of the signal, determined by the system hardware; π is the circular ratio; t is the integral variable.

[0018]

[0019] in Regardless of the sampling interval T, use the matlab numerical calculation tool to find E(n), the method is as follows:

[0020] syms t;

[0021] double(int(sin(pi*t) / pi / t,t,n,n+1));

[0022] The results of E(n) when n=0,1,...,19 are shown in the table below:

[0023] ...

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Abstract

The invention relates to a digital integrator implementing method based on ideal reconstruction filter impulse response fitting. An analog signal can be fitted by sampling weighing due to time delay of an ideal reconstruction filter impulse response, so that an integral of the analog signal can be obtained by sampling weighing on an integral of the ideal reconstruction filter impulse response. According to the digital integrator implementing method, the integral of the ideal reconstruction filter impulse response can be calculated off line, and a signal integral is calculated by performing weighted summation on a signal sampling value; therefore, the integral precision is high; the digital integrator implementing method is suitable for a complicated environment in which detected current contains higher harmonic.

Description

technical field [0001] The invention relates to a digital integrator, in particular to a digital integrator realization method based on ideal reconstruction filter impulse response fitting. Background technique [0002] The current transformer based on Rogowski coil uses Rogowski coil as the primary current sensing unit, which has good linearity, simple insulation structure, no safety hazard, no iron core, no magnetic saturation phenomenon, high measurement bandwidth and high accuracy. widely used. However, since the secondary output voltage signal of the Rogowski coil is the differential of the primary current signal, it is necessary to add a corresponding integral link to recover a signal proportional to the primary current. [0003] There are two types of integrators, analog and digital. Analog integration is easily affected by the dispersion, temperature drift, time drift characteristics of analog devices, operational amplifier offset current, offset voltage and input ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 陈阳潘赛虎邹凌
Owner CHANGZHOU UNIV
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