A Method of Multiplying High-Precision Second Pulse to Generate Sampling Pulse Based on FPGA

Abstract

The invention discloses a method for adopting high-accuracy pulse per second frequency multiplication to produce sampling pulses based on an FPGA in the technical field of electric power system measurement and control and aims at solving the technical problem that sampling pulses provided by an oscillator in the prior art enable the sampling accuracy to be low. In the method, an actual synchronous pulse per second counting value is compared with an ideal synchronous pulse per second counting value, deviations and sampling frequencies are subjected to accumulation calculation, the correction situation of a pulse counter is judged according to an accumulation calculation result, accordingly total deviations of actual synchronous pulses per second are averagely distributed in actual sampling pulses, sampling pulse errors are remarkably decreased, and reliable and stable sampling pulse signals are provided for analog-digital signal acquisition. In addition, the method is simple and easy to operate, occupied FPGA chip resources are decreased, and the running speed and reliability of the FPGA are improved.

Description

technical field [0001] The invention relates to a method for realizing high-precision sampling pulse output, in particular to a method for generating sampling pulses based on FPGA-based high-precision second pulse frequency multiplication, and belongs to the technical field of power system measurement and control. Background technique [0002] With the rapid development of the power system, the capacity and structure of the power grid are undergoing tremendous changes, and the instrumentation industry is also constantly improving. In power quality monitoring, there are generally two methods for sampling and calculating basic power parameters, namely AC sampling method and DC sampling method. The DC sampling method only performs a proportional conversion on the sampling value, and its measurement accuracy is limited, with large errors and instability. Therefore, AC sampling is usually required to obtain high-precision and high-stability electrical parameters. During AC sampl...

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Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies in the prior art and provide a method for sampling pulses based on FPGA-based high-precision second pulse frequency multiplication, which solves the problem in the prior art that the sampling pulses directly provided by the clock oscillator lead to low sampling accuracy. technical problem

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