Electric energy quality mixing detection method

A technology of power quality and detection method, applied in the field of electric power, can solve the problems of large error and poor real-time performance, and achieve the effect of eliminating flicker measurement error, improving real-time performance and reducing the amount of calculation.

Inactive Publication Date: 2016-01-06
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID QINGHAI ELECTRIC POWER COMPANY
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Problems solved by technology

[0006] The existing power quality detection methods have the problems of large errors and poor real-time performance

Method used

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Embodiment Construction

[0036] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0037] like figure 1 , figure 2 and image 3 As shown, the power quality hybrid detection method of the present invention includes an interharmonic detection method based on a complex modulation refined spectrum analysis method, an improved voltage fluctuation detection method, and a flicker measurement method based on chirp Z transform. Respectively for power quality detection intermediate harmonic detection, voltage fluctuation detection and flicker detection. The above detection method will be described in detail below.

[0038] 1. Interharmonic detection method based on complex modulation refinement spectrum analysis method:

[0039] Harmonics in power syst...

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Abstract

The invention discloses an electric energy quality mixing detection method. The method comprises the following steps of using an inter-harmonic detection method based on a complex modulation refinement spectrum analysis method to detect interharmonics in a power grid; using a voltage fluctuation demodulation method to measure voltage fluctuations in the power grid; and using a flicker measurement method based on chirp Z transform to measure flickering in the power grid. An electric energy quality detection operand is reduced, real-time performance of inter-harmonic detection is increased and a flicker measurement error is eliminated maximumly. The chirp Z transform is used to calculate a frequency and an amplitude of a fluctuation component. An disadvantage that the flicker detection has a large error in a low frequency band is overcome. An effective support is provided for electric energy quality detection result correctness.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a hybrid detection method for power quality. Background technique [0002] As an economical, clean, easy-to-control and convertible energy, electric energy has been widely used in modern society. With the development of science and technology and the growth of national economy, the demand for electric energy in human society is increasing day by day. High-quality electric energy is essential for ensuring It is of great significance to industrial and agricultural production and the normal life of residents. In order to better measure the quality of electric energy, people put forward the concept of electric energy quality. [0003] The so-called power quality generally refers to high-quality power supply, including voltage quality, current quality, power supply quality and power quality. Power quality problems can be defined as: deviations in voltage, current or frequency that caus...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 刘可孟可风赵世昌王轩丛贵斌王少飞汪凤月杨文丽
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID QINGHAI ELECTRIC POWER COMPANY
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