Method and system for obtaining arbitrary initial phase sine function sequence from electric power signal
A sine function, power signal technology, applied in the field of power system, can solve the problems of poor anti-harmonic and noise interference, low measurement accuracy, spectrum leakage, etc., to achieve the effect of improving the accuracy of sine parameter calculation
Active Publication Date: 2018-01-30
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology
Due to the limitations of actual signal processing technology and the complexity of signal composition, such as the influence of data quantization background noise caused by discrete sampling of signals, the problem of spectrum leakage caused by signal sequence truncation is objectively unavoidable, and the influence of arbitrary and uncertain initial phase problems of signals , DC and sub-harmonics in the signal and the influence of sub-harmonic problems, etc., so these algorithms have low measurement accuracy and poor anti-harmonic and noise interference
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[0047] In order to further illustrate the technical means adopted by the present invention and the achieved effects, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and preferred embodiments.
[0048] like figure 1 As shown, a method for obtaining an arbitrary initial phase sine function sequence from a power signal includes steps:
[0049] S101. Obtain a preliminary sequence length according to the lower limit of the power signal frequency range, the preset sampling frequency and the preset integer signal cycle number;
[0050] S102. Sampling the power signal according to the preliminary sequence length to obtain a preliminary sequence of the power signal;
[0051] S103. Preliminarily measure the frequency of the preliminary sequence to obtain a preliminary frequency of the power signal, and obtain a reference frequency according to the preliminary frequency;
[0052] S104. Accordi...
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The invention relates to a method and system for obtaining any initial phase sine function sequence from an electric power signal. The method includes the steps of: after obtaining a zero initial phase reference cosine function modulation sequence and a zero initial phase reference sine function modulation sequence, setting an initial phase, multiplying a sine function of the initial phase by the zero initial phase reference cosine function modulation sequence to obtain a first multiplication sequence, and multiplying a cosine function of the initial phase by the zero initial phase reference sine function modulation sequence to obtain a second multiplication sequence; and adding the first multiplication sequence and the second multiplication sequence together to obtain a sine function sequence of the initial phase. The method provided by the invention can set the initial phase of the sine function sequence according to actual requirements, avoids influence of the problem of arbitrary and uncertain initial phase of an input sequence, and is of positive significance to improving the degree of accuracy of sine parameter calculation.
Description
technical field [0001] The invention relates to the technical field of power systems, in particular to a method and system for obtaining an arbitrary initial phase sinusoidal function sequence from a power signal. Background technique [0002] The frequency measurement, phase measurement and amplitude measurement of the power system are all sinusoidal parameter measurements in essence. Fast Fourier Transform (FFT) and Discrete Fourier Transform (DFT) are basic mathematical methods for calculating sinusoidal parameters and are widely used in power systems. However, with the development of sinusoidal parameter measurement technology, the problems of fast Fourier transform algorithm and discrete Fourier transform algorithm have become more and more prominent, and it is difficult to further meet the requirements of high-accuracy calculation of sinusoidal parameters in power systems. [0003] In terms of sinusoidal parameter measurement of power system, there are some improved p...
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IPC IPC(8): G01R23/167
CPCG01R23/167
Inventor 潘凤萍李军王越超刘哲胡康涛
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID