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Novel power system harmonic and inter-harmonic wave detection and estimation method based on chaotic oscillator

A technology for chaotic oscillators and power systems, which is applied in measurement devices, measurement of electrical variables, frequency measurement devices, etc., can solve the problem of difficult simultaneous effective detection of power harmonics and inter-harmonics, and can not take into account the effective detection of power harmonics and inter-harmonics. , poor anti-noise interference ability, etc.

Inactive Publication Date: 2015-10-07
HARBIN RES INST OF ELECTRICAL INSTR
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Problems solved by technology

[0003] At present, the methods available for harmonic and interharmonic detection in power systems mainly include: fast Fourier transform method with comprehensive windowing and interpolation sampling, wavelet transform-based Harmonic detection methods, modern spectrum estimation and artificial neural network methods, although these methods have their own advantages, and can effectively solve some specific power system harmonic detection problems, but due to the limitations of their respective methods, they cannot take into account all orders of power. Efficient detection of harmonics and interharmonics
Existing detection methods for power harmonics and inter-harmonics have the problems of insufficient frequency resolution and poor anti-noise interference to varying degrees, which makes it difficult for existing methods to achieve synchronization of power harmonics and inter-harmonics Effective detection, for the presence of strong noise interference, it is even more difficult to achieve accurate detection under low signal-to-noise ratio

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Embodiment Construction

[0033] 1. Detection and frequency estimation of harmonics and inter-harmonics

[0034] This method realizes the detection and frequency estimation of power harmonics and inter-harmonics through the following technical solutions:

[0035] 1.1. Use 1.03 as the common ratio to set a set of sequence a that can cover the frequency band where the harmonics and inter-harmonics to be tested are located n .

[0036] 1.2. Program the variable step size dual coupling Duffing system through MATLAB software. The mathematical model of the system is:

[0037] x ’’ +0.5x ’ -(μ-x)-x+x 3 =r 0 cos(ω 0 t)+s(t) (1)

[0038] mu ’’ +0.5μ’ -(x-μ)-μ+μ 3 = r 0 cos(ω 0 t )

[0039] Add the data to be measured including power harmonics and inter-harmonics to the s(t) item of the above formula, and use the fourth-order Runge-Kutta numerical solution method to solve formula (1), according to the settings in step 1.1 The system solution step sequence adjusts the calculation step ...

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Abstract

The invention provides a novel power system harmonic and inter-harmonic wave detection and estimation method based on a chaotic oscillator, aiming to solve the problems that a power system harmonic and inter-harmonic wave detection and estimation method is bad in resolution of harmonic and inter-harmonic waves with similar frequency and is weak in noise interference resistance capability. The method includes two parts: a variable metric type double coupling intermittent chaotic oscillator through the integration of a variable metric algorithm and a double coupling intermittent chaotic oscillator array method, which is characterized by high resolution in signal frequency to be detected and high noise interference resistance capability and is capable of performing synchronous effective detection and high-precision frequency estimation on the harmonic and inter-harmonic waves at a low signal to noise ratio; and a new method for sinusoidal signal amplitude and phase synchronization estimation based on the phase climacteric double coupling chaotic oscillator, which is capable of realizing high-precision amplitude and phase estimation of harmonic and inter-harmonic waves under the condition of strong interference noises.

Description

technical field [0001] The invention is used for the detection and parameter estimation of harmonics and inter-harmonics of electric power system. Background technique [0002] In recent years, with the use of various non-stationary and nonlinear electrical devices and the access of distributed power sources, the types and contents of harmonics and inter-harmonics in the power grid have increased sharply, which has seriously affected the power quality. Because the thermal effect, insulation effect, interference and amplification caused by harmonics and interharmonics have caused great harm to the power system itself and power users, it is of great significance to study and suppress power harmonics and interharmonics. Accurately detecting the components of harmonics and inter-harmonics in the power system and performing high-precision parameter estimation is the fundamental basis for effectively controlling power harmonics and inter-harmonics. Therefore, detection of power ha...

Claims

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Application Information

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IPC IPC(8): G01R23/02G01R23/04G01R25/00G01R19/00
Inventor 丛超王慧武
Owner HARBIN RES INST OF ELECTRICAL INSTR
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