Sampling value linear interpolation calculation device based on FPGA (Field Programmable Gate Array) and calculation method

Abstract

The invention relates to a sampling value linear interpolation calculation device based on a FPGA (Field Programmable Gate Array) and a calculation method. The calculation device comprises a summator / subtractor, a multiplying unit, a calculation data dispatcher, a lookup unit and a truncation calculation device; a linear interpolation calculation formula is gradually split by middle parameters and is classified into addition and subtraction, and multiplying operation; the middle parameters are loaded in steps by adopting a time division multiplexing manner to carry out calculation, looking up and reading a proportionality coefficient k according to a current data frame receiving moment interval t2-t1 and a preset lower limiting value T, and utilizing the proportionality coefficient k into the truncation calculation device to replace a division method to be used for the linear interpolation calculation, so as to obtain a required Vx value. According to the sampling value linear interpolation calculation device, the direct division method operation is saved by a lookup manner and the quantity of the summator / subtractor and the multiplying unit is reduced by a time division multiplexing manner, so that a lot of resources are saved. An original extremely tensioned hardware resource occupation condition is effectively remitted under the precondition of finishing an existing function, and resource allowance is remained for product up-gradation under the condition that an FPGA chip is not replaced at the later period.

Description

technical field [0001] The invention relates to the technical field of substation sampling value processing, in particular to an FPGA-based linear interpolation arithmetic unit and operation method for sampling values. Background technique [0002] Interpolation operation is one of the important functions of the sampling value processing device of the smart substation, which is used to transform the data stream collected from afar into a data stream equivalent to that collected locally. Linear interpolation is the most basic and commonly used type of interpolation. It utilizes the sampling values ​​V1 and V2 collected from the variable Vt at time t1 and t2, and assumes the sampling value Vx at time tx in the Vt-t coordinate system It is on a straight line with V1 and V2, so the value of Vx can be obtained by solving the linear equation, and its operation formula is . Due to the need for division during calculation, and the resources occupied by the division operation are ...

AI Technical Summary

Problems solved by technology

Due to the need for division during calculation, and the resources occupied by the division operation are relatively large, the hardware resources of the FPGA chip are tight; at the same time, addition, subtraction, and multiplication operations need to be repeated during the operation process. If no measures are taken, it will further cause FPGA chips. The hardware resources of the

In view of these situations, if a large-capacity chip is used, the cost will increase significantly, which is not convenient for the popularization of the processor.

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