A High Precision Digital Integrator Based on Gaussian Algorithm

Abstract

The invention provides a high precision digital integrator based on a Gauss algorithm. The high precision digital integrator based on a Gauss algorithm comprises a high pass filter, an analog-to-digital converter, a microprocessor, a high precision clock and a digital-to-analog converter, wherein the high pass filter is used for eliminating a direct current interference signal and preventing integral saturation; the analog-to-digital converter performs sampling according to a command of the microprocessor, and converts an analog signal into a digital signal; the microprocessor generates a sampling time according to the sampling point number, and sends a trigger command to the analog-to-digital converter according to the time information transmitted from the high precision clock; whenever the required sampling points are sampled enough, the microprocessor calculates one time, and sends the calculated result to the digital-to-analog converter, and at the same time controls resetting of the high precision clock; and the digital-to-analog converter is used for converting the digital signal into the analog signal and outputting the result. The theoretical analysis and the simulation experiment can prove that the precision of the designed digital integrator is higher than the precision of a trapezoid or Simpson digital integrator with the same sampling point number, and is high in the anti-frequency fluctuation and harmonic wave interference capability after comparison.

Description

technical field [0001] The invention relates to the field of power system measurement, in particular to a high-precision digital integrator based on Gaussian algorithm, which can effectively resist frequency fluctuation and harmonic interference. Background technique [0002] With the continuous development of the power system in the direction of ultra-high voltage and large capacity, when the power system is under short-circuit and other faults, a short-circuit current much larger than the rated current may pass through the electronic current transformer, and the current transformer for protection should ensure a certain accuracy. , to ensure the correct action of the relay protection device, which requires the composite error of the electronic current transformer to meet the "composite error" regulation of the electronic current transformer for relay protection in GB / T20840.8: the secondary current in the steady state The effective value of the difference between the insta...

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