Method and system for converting power signals into zero initial phase signal sequence
A power signal, zero initial phase technology, applied in the power field, can solve the problems of low measurement accuracy of sinusoidal parameters, poor anti-harmonic and noise interference, and achieve the effect of improving anti-harmonic and noise interference and improving accuracy
Active Publication Date: 2015-11-18
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Due to the limitations of actual signal processing technology and the complexity of signal composition, the above measurement methods have low measurement accuracy for sinusoidal parameters and poor anti-harmonic and noise interference
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[0054] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0055] Although the steps in the present invention are arranged with labels, they are not used to limit the order of the steps. Unless the order of the steps is clearly stated or the execution of a certain step requires other steps as a basis, the relative order of the steps can be adjusted.
[0056] In one embodiment, the method for converting the electric power signal into a sequence of zero initial phase signals, such as figure 1 shown, including the following steps:
[0057] Step S101: Obtain the preliminary sampling sequence length of the power signal according to the lower limit of the power signal frequency range, the preset sampling frequency and the preset integer signal cycle number;
[0058] Step S102: Preliminarily sample the power signal according t...
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The invention discloses a method and a system for converting power signals into a zero initial phase signal sequence. The method comprises the following steps: acquiring an initial sampling sequence length and an initial sampling sequence; acquiring a reference frequency according to the initial sampling sequence; acquiring a unit cycle sequence length according to a preset sampling frequency and the reference frequency; acquiring a preset sequence length according to a preset integer signal cycle number and the unit cycle sequence length; acquiring forward and reverse sequences from the initial sampling sequence; acquiring zero initial phase cosine and sine function modulation sequences according to the forward and reverse sequences, and further acquiring a zero initial phase selection sequence; and multiplying reference frequency cosine and sine functions by the forward sequence and then by the reverse sequence and carrying out digital trapping, vector integration, vector integration value conversion and phase transformation to obtain the average initial phase of the forward sequence, and acquiring a zero initial phase signal sequence according to the zero initial phase selection sequence. By adopting the method and the system of the invention, the accuracy and the anti-harmonic and noise interference performance of sinusoidal parameter calculation are improved.
Description
technical field [0001] The invention relates to the field of electric power technology, in particular to a method and system for converting electric power signals into zero initial phase signal sequences. Background technique [0002] The frequency measurement, phase measurement, amplitude measurement, etc. of the power system are all measurements of sinusoidal parameters in essence. Fourier transform is the basic method to realize the measurement of sinusoidal parameters, and it is widely used in power system. However, with the development of sinusoidal parameter measurement technology, the problems of Fourier transform 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 the measurement of sinusoidal parameters in power systems, there are many measurement methods, such as zero-crossing method, filter-based measurement method, wavelet transform-based method, ...
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IPC IPC(8): G01R25/04G01R23/12G01R19/00
Inventor 李军叶向前李晓枫刘哲
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID