A Method of Signal Phasor Measurement Based on Trigonometric Function Iteration

Abstract

The invention discloses a signal phasor measurement method based on trigonometric function iteration, which samples the signal in the time domain to obtain an N-point discrete sequence, uses a quasi-synchronous sampling algorithm to estimate the fundamental wave frequency of the sampled signal, and uses trigonometric functions and angle formulas Decompose the triangular basis function on the time domain signal, construct the matrix model of the discrete sequence signal, initialize the parameters of the matrix model by using the estimated value of the fundamental frequency, select the maximum value of the first derivative of the component as the iterative decrease factor, and establish the iterative adjustment equation, according to the parallel iterative The algorithm calculates the signal matrix model coefficients, and thus obtains the measurement results of the signal phasor. The method of signal phasor measurement based on trigonometric function iteration can effectively avoid the spectral leakage of traditional Fourier transform, select the maximum value of the first derivative to construct the iterative adjustment equation, the algorithm is easy to calculate, and can ensure the fast and stable convergence process.

Description

technical field [0001] The invention relates to the field of signal phasor measurement, in particular to a method for signal phasor measurement based on trigonometric function iteration. Background technique [0002] Since the reform and opening up, my country's economy has developed rapidly, and the related electric power industry has also made great progress. With the development of power electronics technology, non-linear power electronic devices and semiconductor devices have been widely used in power systems, but the harmonic problems brought about by the use of non-linear devices have become more and more threatening to the stability of power systems and power quality. However, the realization of real-time and accurate measurement of power signal phasors can effectively solve the threat brought by harmonic problems, and can also greatly improve the monitoring, analysis, control and protection of power systems. [0003] The current main signal phasor measurement algori...

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Problems solved by technology

[0003] The current main signal phasor measurement algorithms can be divided into three categories: (1) Fourier transform method, including discrete Fourier transform method, recursive Fourier transform method and differential Fourier transform method, its characteristic algorithm is stable Good performance and high accuracy, but it is easy to produce large errors when the system frequency changes quickly; (2) Zero-crossing detection method, which is characterized by a relatively simple principle and is easy to use in DSP (digital signal processor) and embedded (3) Parameter optimization estimation method, including its characteristics of high detection accuracy, fast convergence speed, and stable convergence process, but a large amount of calculation , for hardware computing equipment, the data processed is still relatively large

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