Digital integrator implementing method based on ideal reconstruction filter impulse response fitting

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 ...

AI Technical Summary

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

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