Error correction algorithm for recursive calculation of relay protection device

Abstract

The invention discloses an error correction algorithm for recursive calculation of a relay protection device. The error correction algorithm is used for realizing recursive calculation of signal processing to A / D sampling data of voltage and current signals accessing the relay protection device and also comprises the following steps: carrying out one-time non-recursive calculation on every adjacent recursive calculation data windows, comparing a non-recursive calculation result with a recursive calculation result, if the results are the same, continuing to carry out next-time recursive calculation, if not, replacing the recursive calculation result with the non-recursive calculation result, and then carrying out next-time recursive calculation. The error correction algorithm disclosed by the invention has the advantages that not only can the high efficiency of recursive algorithm be achieved, but also the security of non-recursive algorithm is obtained, the memory effect of the recursive algorithm is eliminated, unrecoverable calculation deviation caused by accidental errors is prevented and the security and the reliability for relay protection are improved.

Description

technical field [0001] The invention belongs to the technical field of electric power system and automation thereof, and particularly relates to a relay protection device or other error correction algorithms related to digital signal processing and recursive calculation. Background technique [0002] Algorithms are one of the key points in the research of computer relay protection, and there are many kinds of algorithms that have been proposed so far. The criteria for analyzing and evaluating the pros and cons of various algorithms are precision and speed. To calculate accurately, it often takes more sampling points and consumes more computing workload. Therefore, the essence of studying microcomputer protection algorithms is how to balance speed and precision There are two trade-offs. [0003] Algorithms such as mean value and Fourier integral are the most commonly used algorithms in digital signal processing. In general, it takes a lot of time to implement the above algor...

AI Technical Summary

Problems solved by technology

[0026] It is worth noting that in the actual algorithm implementation process, after the protection device is powered on and reset, the data window S 1 Initialization, if there is no initialization, modification caused by accidental factors such as initialization exception or interference will cause A in the recursive algorithm i Due to the memory effect, this abnormal value has been kept in the subsequent recursive calculations, which has caused major hidden dangers. At the same time, this kind of error is very hidden and has not attracted enough attention.

If the relay protection device adopts a non-recursive algorithm, there is no such problem, but in the case of long data windows and many sampling channels, the calculation amount will increase by dozens of times, which requires a higher performance processor to complete, increasing the cost of the product

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