Method and system for obtaining zero initial phase reference point of power signal sequence cosine function

A technology of cosine function and zero initial phase, which is applied in the system field of obtaining the zero initial phase reference point of the cosine function of the power signal sequence, can solve the problems such as the difficulty in determining the zero initial phase reference point of the cosine function and the influence of the cosine function on the results, and achieves Improve the anti-harmonic and noise interference, improve the accuracy, and achieve the effect of precise zero initial phase reference point

CN105182075BActive Publication Date: 2018-01-30ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-01-30

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Abstract

The invention relates to a method and a system for obtaining a zero-initial phase reference point of a power signal sequence cosine function. The present invention acquires the forward sequence and the defold sequence through a series of operation steps, and adds the forward sequence and the defold sequence to obtain the cosine function modulation sequence with zero initial phase. The cosine function modulation sequence obtained in the present invention avoids the influence of the problem of large initial phase changes of the signal sequence, and at the same time, the cosine function modulation sequence carries the full phase difference information of the signal sequence with a large value, which can significantly improve the sine parameter The accuracy of the calculation improves the anti-harmonic and noise interference, so the zero-initial phase reference point determined according to the cosine function modulation sequence is accurate, which is of great significance to the experimental research of electric power science and physics.
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Description

technical field

[0001] The invention relates to the field of electric power technology, in particular to a method for obtaining a zero-initial phase reference point of a cosine function of a power signal sequence and a system for obtaining a zero-initial phase reference point of a cosine function of a power signal sequence. Background technique

[0002] In the experimental research of electric power science, the determination of the zero-initial phase reference point of the cosine function is of great significance to the experiment and research itself. In the simulation experiment research, there is no problem in determining the reference point of the zero initial phase of the cosine function. However, in the research of physical experiments, there are many difficulties in determining the reference point of the zero initial phase of the cosine function for the discretely collected data. The uncertainty of the zero initial phase reference point of the cosine function in phys...

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Embodiment Construction

[0030] 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.

[0031] Such as figure 1 As shown, a method for obtaining the zero-initial phase reference point of the cosine function of the power signal sequence includes steps:

[0032] 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;

[0033] 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;

[0034] S103. Perform a preliminary frequency measurement on the preliminary sampling sequence, acquire a preliminary frequency of the...