Method and system for zero initial phase sinusoidal function modulation on power signal sequence
A power signal and sine function technology, applied in the power field, can solve the problems of spectrum leakage, poor anti-harmonic and noise interference, and low measurement accuracy, and achieve the effect of improving anti-harmonic and noise interference and improving accuracy
Active Publication Date: 2017-11-14
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, the influence of arbitrary initial phase problems of signals, and the The impact of DC and sub-harmonics and sub-harmonic problems, etc., the measurement accuracy of these algorithms is also low, and the anti-harmonic and noise interference are poor
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[0028] In order to better understand the technical problems to be solved by the present invention, the technical solutions adopted and the technical effects achieved, the specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0029] Such as figure 1 As shown, a method for modulating a power signal sequence with a zero-initial phase sine function includes steps:
[0030] S101. Obtain a preliminary sampling sequence length according to the lower limit of the power signal frequency range, the preset sampling frequency and the preset integer signal cycle number;
[0031] S102. Preliminarily sample the power signal according to the length of the preliminary sampling sequence, and obtain a preliminary sampling sequence of the power signal;
[0032] S103. Perform a preliminary frequency measurement on the preliminary sampling sequence, acquire a preliminary frequency of the power signal, and determi...
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The invention relates to a method and a system for performing zero-initial phase sinusoidal function modulation on a power signal sequence. The present invention obtains a forward sequence and an anti-convoluted sequence through a series of operations, subtracts the forward sequence and the de-convoluted sequence, and modulates the power signal sequence to zero initial phase or a large variation range of the initial phase of the power signal sequence A sinusoidal modulation sequence with an initial phase near zero. The sinusoidal function modulation sequence obtained by the present invention avoids the influence of the large initial phase change of the signal sequence, and at the same time, the sinusoidal function modulation sequence carries the signal sequence full phase difference information with a large value, which can significantly improve the sinusoidal parameters Measurement accuracy, improve immunity to harmonics and noise interference.
Description
technical field [0001] The invention relates to the field of electric power technology, in particular to a method for modulating a power signal sequence with a zero-initial phase sinusoidal function and a system for performing a zero-initial phase sinusoidal function modulation on a power signal sequence. Background technique [0002] The measurement of the sinusoidal parameters of the power system includes frequency measurement, phase measurement, amplitude measurement and so on. 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 terms of sinusoidal parameter measurement of power system, there are some improved paramete...
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IPC IPC(8): G01R23/16
Inventor 李军陈世和万文军罗嘉庞志强
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID