Electric power steady-state signal tracking measurement based on self-adapting filter

Abstract

The invention relates to an electricity power steady-state signal tracking measuring method based on a self-adapting filter. A group of self-adapting filters are designed according to a gradient descent method to produce a sample signal which can be automatically adjusted to fit the measured signals until the fitted difference is lower than the enacted scope, then the output of the self-adapting filters can accurately describe measured signals, thus the high-precision measurement and analysis of the electricity power steady-state signal can be achieved. The measuring method uses a closed loop calculating method which can analyze non-periodical sine wave sampling data caused by non-synchronous sampling and non-complete harmonic wave, etc., can judge and correct the distortion of the samples, and accurately and reliably realize the measurement of the steady state of the electricity power system. The measuring method is characterized by steady astringency, rapid convergence, precise testing, steady performance, good property of real time, strong anti-interference and robustness, and can be applied in different modes, such as the sampling way in a routine factory and gathered sampling in fixed frequency in a digital transformer substation.

Description

technical field [0001] The invention relates to a power steady-state signal tracking measurement method, in particular to a power steady-state signal tracking measurement based on an adaptive filter. Background technique [0002] Accurate measurement and analysis of voltage and current signals is the basis for power flow analysis, control and metering. Traditional power telecontrol devices and metering devices mainly use Fourier algorithm, integral algorithm or their improved algorithms. [0003] The current problems with the above methods are: [0004] 1) The traditional algorithm must be based on scattered synchronous sampling. In the new digital substation, the centralized non-synchronous sampling method (fixed frequency sampling) will cause the calculation results of the traditional algorithm to exceed the standard. When the grid frequency deviation is 10%, the maximum error can reach 6%. [0005] 2) The traditional measurement and analysis method can measure and anal...

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Problems solved by technology

[0005] 2) The traditional measurement and analysis method can measure and analyze the fundamental wave and the whole harmonic, but cannot analyze the non-whole harmonic

[0006] 3) The traditional algorithm is an open-loop algorithm. When the original data is distorted, the wrong measurement result is still passed to the subsequent related links as the measurement result

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