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Complex power harmonic wave parameter estimation method

A technology for parameter estimation and power harmonics, applied in the field of power quality analysis and control, to achieve the effects of strong versatility, small amount of calculation, and high precision

Inactive Publication Date: 2017-05-31
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0013] In order to solve the technical problems raised by the above-mentioned background technology, the present invention aims to provide a parameter estimation method for complex power harmonics, which overcomes the disadvantages of the traditional FFT method in analyzing complex harmonics, introduces nonlinear programming problems into harmonic analysis, and develops The idea of ​​complex harmonic analysis

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Embodiment Construction

[0035] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] Such as figure 1 As shown, a parameter estimation method for complex power harmonics, the specific process is as follows.

[0037] Let a steady-state harmonic signal be In the form of sampling frequency f s =1 / T s Discretize x(t) to get a sequence of numbers:

[0038]

[0039] Among them, A is the signal amplitude, f 0 is the signal frequency, is the initial phase of the signal, f s is the discretized sampling frequency, T s is the sampling period.

[0040] Select the window function w(n), add a window to the signal x(n) and truncate it, and only consider the positive frequency f 0 Near the spectrum, the spectrum of the windowed signal x(n)w(n) is:

[0041] X(k)=Ae jθ W(k-k 0 ')

[0042] Among them, W(*) is the continuous spectrum function of the window function, N is the number of sampling points, k is the digita...

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Abstract

The invention discloses a complex power harmonic wave parameter estimation method. The method comprises the steps that complex harmonic waves are discretized; windowing truncation is conducted on a discretization signal; amplitudes of multiple spectral lines in a frequency domain are acquired, and a harmonic wave parameter estimation problem is converted into a constraint-condition-containing nonlinear programming problem according to the theoretical amplitudes and the actual amplitudes of the spectral lines; the nonlinear programming problem is solved, and harmonic wave parameters are obtained. According to the method, the precision is high, a small calculation amount is needed, and the problem brought by different harmonic wave spectrum leakage interference can be well solved.

Description

technical field [0001] The invention belongs to the field of power quality analysis and control, and in particular relates to a parameter estimation method of complex power harmonics. Background technique [0002] The complex harmonics of the actual power grid contain rich inter-harmonic components, and the inter-harmonics have some characteristics different from the integer harmonics. If the FFT method is simply used, many problems will arise, which is also the biggest problem in the analysis of complex stationary harmonics. challenge. Compared with integer harmonics, interharmonics have the following characteristics: [0003] 1. The inter-harmonic frequency is not an integer multiple of the fundamental frequency, and it is even difficult to determine its approximate period, so it is basically impossible to achieve synchronous sampling of the inter-harmonic components. [0004] 2. The spectra of inter-harmonics and integer harmonics / inter-harmonics may be very close, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 刘昊陈奎方永丽唐轶
Owner CHINA UNIV OF MINING & TECH
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