Cycle sampling method in quality of power supply in electrical network

A technology for power quality and power grids, applied in frequency measurement devices, spectrum analysis/Fourier analysis, etc., can solve problems such as large measurement errors and lost sampling points
CN1727906AActive Publication Date: 2006-02-01STATE GRID CORP OF CHINA +3
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2006-02-01

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Abstract

A method of cycle sampling for detecting electric energy quality includes using a fixed sampling frequency for sampling and using waveform fitting technique to restore it to be waveform, finding out zero ¿C crossover point of the waveform with least square method to obtain a complete cycle, carrying out secondary sampling on fitted waveform and analyzing electric energy quality index in system according to these points.
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Description

(1) Technical field:

[0001] The invention relates to a method for measuring power quality indicators in a power system, in particular to a cycle sampling method in power grid power quality. (two) background technology:

[0002] With the development of economy, electricity plays an increasingly important role in economic life. The quality of electric energy is directly related to the overall benefit of the national economy. At present, the impact and non-linear loads in the power grid are increasing, which leads to serious deterioration of power quality problems such as harmonics, voltage fluctuations, and three-phase imbalances; and a large number of sensitive loads such as control equipment and electronic devices based on computer systems The emergence of temporary overvoltage and transient overvoltage, voltage sags and short-time interruptions, etc. The economic losses caused by power quality problems that have not been paid attention to by people are also increasing. The...

Claims

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