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Power system frequency measurement method and bus voltage correction method and devices

A technology for power system and bus voltage, applied in frequency measurement device, effective value measurement, etc., can solve problems such as large frequency error, and achieve the effect of improving accuracy and solving large measurement error.

Inactive Publication Date: 2020-02-21
XUCHANG XJ SOFTWARE TECH +4
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Problems solved by technology

[0004] The object of the present invention is to provide a method and device for measuring the frequency of a power system to solve the problem of large frequency errors caused by using line voltages for frequency calculations with abrupt signals; the present invention also provides a bus voltage correction method and device, In order to solve the current problem of lack of correction of the bus voltage

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  • Power system frequency measurement method and bus voltage correction method and devices
  • Power system frequency measurement method and bus voltage correction method and devices
  • Power system frequency measurement method and bus voltage correction method and devices

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Embodiment Construction

[0037] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0038] Embodiment of the power system frequency measurement method of the present invention

[0039] According to the three-phase bus voltage analog quantity connected to the power system, the present invention first uses the full-cycle Fourier algorithm to sequentially calculate the real part and imaginary part of the positive-sequence phase voltage at the current time, the previous 1 / P cycle time, and the previous 2 / P cycle time According to the real part and imaginary part of the positive sequence phase voltage at these three moments, the calculation frequency of the system is calculated. At the same time, in order to improve the accuracy of frequency measurement, a half-cycle integral algorithm with frequency tracking function is used to further calculate and correct the bus voltage analog quantity, and the calculated frequency is error-...

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Abstract

The invention relates to a power system frequency measurement method and bus voltage correction method and devices and belongs to the technical field of power system frequency measurement. According to the invention, the frequency of a power system is calculated by adopting positive-sequence phase voltage, for a voltage analog quantity, no matter an angle error is generated since an amplitude changes suddenly or a neutral point shifts, positive sequence components calculated by three-phase voltage phasor synthesis can effectively counteract errors and offsets in the positive sequence components, therefore, the frequency measurement method is not influenced by a voltage zero crossing point and harmonic waves, the frequency of the power system under a steady state condition can be accuratelymeasured, and the problem of a large frequency measurement error caused by the sudden change of the voltage is effectively solved.

Description

technical field [0001] The invention relates to a power system frequency measurement method, a bus voltage correction method and a device, and belongs to the technical field of power system frequency measurement. Background technique [0002] Frequency is one of the important electrical parameters of the power system. The safety automatic device of the power system needs to measure its value in real time, and make corresponding control measures according to the change of its value. Therefore, the measurement accuracy of the frequency directly affects the correct operation of the safety automatic device. sex. At present, most safety automatic devices use the discrete Fourier transform method to calculate the frequency of the measured voltage. This algorithm is inherently insensitive to harmonic components. Although it can accurately measure the frequency of the power system in a steady state, it is not suitable for dynamic sudden Changing signals can cause large measurement ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02G01R19/02
CPCG01R19/02G01R23/02
Inventor 毛林余高旺杨凯龚赟王莉尹明白申义赵晓铎蔺立许圣龙张延海王宏杰魏艳伟马小燕李磊郑业兵胡舒怡赵琦李亚爽方陈
Owner XUCHANG XJ SOFTWARE TECH
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