A high-precision and anti-interference measurement method for fundamental frequency and phase of power system
A fundamental frequency, power system technology, applied in frequency measurement device, phase angle between voltage and current, measurement device and other directions, can solve spectrum leakage, complex operating conditions of power equipment, affecting frequency, phase measurement, etc. problem, to achieve the effect of high calculation accuracy, good application prospects, and strong anti-interference ability
Active Publication Date: 2019-06-28
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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Problems solved by technology
The Fourier analysis algorithm is relatively mature, but there is a certain measurement deviation due to spectrum leakage and other issues; the principle of the zero-crossing algorithm is simple, but when the harmonic or DC component is superimposed, the algorithm has a large error
In addition, the operating conditions of power equipment are relatively complex, and the sampling data is easily disturbed, which directly affects the measurement of frequency and phase
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[0037] The present invention will be further described below in conjunction with the accompanying drawings.
[0038] Such as figure 1 , figure 2 As shown, the power system fundamental frequency and phase measurement method of the present invention includes the following steps, wherein steps 1 to 7 are the parameter calculation process of the real part and imaginary part extraction algorithm, and steps 8 to 12 are the frequency phase calculation process.
[0039] Step 1, determine the initial length N of the complex vector extraction algorithm 1 and truncated length N;
[0040] Step 2, set the frequency parameter f c1 , f c2 ;
[0041] Step 3, according to formula 1, calculate the initial iteration coefficient a of the real part extraction algorithm n , where f s is the sampling frequency, and n is the serial number of the iteration coefficient;
[0042]
[0043] Step 4, according to formula 2, calculate the initial iteration coefficient b of the imaginary part extr...
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The invention discloses a high-precision anti-interference fundamental frequency and phase measurement method of a power system. A real part ure of a fundamental wave and a virtual part uim of the fundamental wave are obtained by using a complex vector extraction algorithm; a complex vector is constructed and a phase angle theta 1 is calculated; a fundamental frequency f is calculated by combining a last phase angle calculation result theta 2; and delay phase compensation is carried out on the theta 1 and a fundamental f phase angle theta is calculated. According to the invention, the real part and the virtual part of the fundamental wave are obtained directly by using the complex vector extraction algorithm, so that influences caused by factors like data interference, a harmonic wave, a direct-current component can be eliminated. Meanwhile, during the parameter designing process, the real part and the virtual part have same gains and delays, so that consistency of the calculation result and the practical waveform can be guaranteed. The method has characteristics of high precision and good anti-interference performance.
Description
technical field [0001] The invention relates to a high-precision and anti-interference method for measuring the fundamental frequency and phase of a power system, belonging to the technical field of power system measurement. Background technique [0002] The frequency, phase and other information of the fundamental wave are important characteristic quantities of AC sampling in power systems, and are closely related to protection, measurement, control and other links. At present, the existing measurement methods are mainly based on Fourier analysis, zero-crossing detection, etc., which have certain limitations. The Fourier analysis algorithm is relatively mature, but due to problems such as spectrum leakage, there are certain measurement deviations; the principle of the zero-crossing algorithm is simple, but when the harmonic or DC component is superimposed, the algorithm has a large error. In addition, the operating conditions of power equipment are relatively complex, and ...
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IPC IPC(8): G01R23/02G01R25/00
CPCG01R23/02G01R25/00
Inventor 李帅陈福锋赵谦龚世敏孙伟
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD