Transient electric energy quality signal analysis method based on high-frequency harmonic compensation iteration EMD

A technology of transient power quality and signal analysis method, which is applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., and can solve problems such as poor speed and poor accuracy

Active Publication Date: 2016-08-17
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0004] In order to overcome the disadvantages of poor rapidity and poor accuracy of the existing transient power quality signal analysis methods, the present invention provides a transient power analysis method based on high-frequency harmonic compensation iterative EMD with good rapidity and high accuracy. Quality Signal Analysis Method

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  • Transient electric energy quality signal analysis method based on high-frequency harmonic compensation iteration EMD
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  • Transient electric energy quality signal analysis method based on high-frequency harmonic compensation iteration EMD

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the accompanying drawings.

[0047] refer to figure 1 and figure 2 , a transient power quality signal analysis method based on high-frequency harmonic compensation iterative EMD, comprising the following steps:

[0048] 1). Original transient power quality signal preprocessing

[0049] Taking the transient power quality signal collected at the key electrical detection nodes of the power system as input, firstly, the signal is preprocessed uniformly, and secondly, the preprocessed data is transformed by fast Fourier transform (FFT) to obtain the transient power quality all frequencies contained in the signal;

[0050] 2). Construct high-frequency compensation signal

[0051] Take the preprocessed signal in step 1) as input, use the empirical mode decomposition method EMD to decompose, obtain the intrinsic mode function IMF component of the fundamental component, and perform HT transformation o...

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Abstract

The invention discloses a transient electric energy quality signal analysis method based on high-frequency harmonic compensation iteration EMD, and the method comprises the following steps: 1), preprocessing a raw transient electric energy quality signal; 2), constructing a high-frequency compensation signal; 3), extracting an IMF component of the transient electric energy quality signal; 4), locating the starting and ending moments of transient disturbance; 5), carrying out the component analysis of the transient electric energy quality signal. The method carries out the decomposition of the IMF component, employs the HT transformation and an amplitude demodulation method for the decomposition of transient amplitude, transient frequency and phase of the signal, can analyzes the transient electric energy quality signal in real time, carries out the locating of the starting and ending moments of transient disturbance, and analyzes the harmonic component in the signal. The method can effectively carry out the locating and analysis of the transient electric energy quality disturbance signal, and provides reference data for the treatment of the electric energy quality, so as to guarantee the stable operation of a power system.

Description

technical field [0001] The invention relates to the technical field of power quality signal analysis and monitoring, in particular to a rapid analysis method for various typical transient power quality signals. Background technique [0002] In addition to traditional thermal power, hydropower, and nuclear power, the types of energy in the existing power system include new energy such as wind power and solar power. In addition, the grid structure is complex and the types of loads are diverse, leading to increasingly prominent problems in the stability of power quality. Various typical transient power quality signals, such as voltage swells, dips, transients, harmonics, transient oscillations, and transient pulses, are essentially the manifestations of power quality with the operating conditions of the time-varying system dynamic characteristics. These power quality problems will cause equipment to heat up and reduce efficiency; lead to power failure and affect production. T...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 潘国兵欧阳静普帅帅徐红伟陈金鑫毛涛涛吴雄增
Owner ZHEJIANG UNIV OF TECH
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