Reactive power, unbalanced and harmonic detection method based on SDFT algorithm

An algorithm and balanced technology, applied in reactive power/actual component measurement, calculation, complex mathematical operation, etc., which can solve the problems of accumulation of errors and the inability of operation errors to cancel each other.

Active Publication Date: 2019-03-08
徐文涛 +3
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[0020] Every time the sliding operation is performed, the twiddle factor must be multiplied, a

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  • Reactive power, unbalanced and harmonic detection method based on SDFT algorithm
  • Reactive power, unbalanced and harmonic detection method based on SDFT algorithm
  • Reactive power, unbalanced and harmonic detection method based on SDFT algorithm

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[0052] The core of the present invention is to provide a detection method for fundamental reactive power, three-phase unbalance and harmonics based on SDFT algorithm. The method has simple operation, less resource occupation, short execution time, and can eliminate interference and iterative calculations. The cumulative error.

[0053] The following describes the technical solutions in the embodiments of the present invention clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0054] Figure 4 This is a flowchart of a method for detecting fundamental reactive power and unbalanced current provided by an e...

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Abstract

A reactive power, unbalanced and harmonic detection method based on SDFT algorithm is as follows: three-phase alternating current signals are sampled at a fixed sampling period to obtain discrete sampling data; a zero sequence component is obtained, and meanwhile a result of removing the zero sequence component is obtained; SDFT conversion is carried out on the sampling data, and the integral result of each current flow under the fundamental wave period point is obtained; according to the calculation formula of DFT, the integral value of each current flow is corrected, and the result of the SDFT operation is replaced; a fundamental wave reactive power and unbalanced component is obtained according to a calculation formula in combination with a power grid voltage phase locking result, and the instantaneous value of the harmonic component can be obtained according to the phase relation; the rotation factor is obtained through a look-up method, only a sine value table is stored, and the memory usage can be reduced; and the stability problem caused by iteration accumulation errors can be eliminated.

Description

technical field [0001] The invention belongs to the field of electric energy quality of the electric power system, and is mainly aimed at the detection of reactive power, unbalance and harmonic signals in the electric energy quality. Background technique [0002] With the rapid development of power electronics and information technology, the wide application of various nonlinear devices, the expansion of power grid scale and the increase of complexity, power quality issues have increasingly become the focus of power supply enterprises and users. The detection and treatment of reactive power consumption, three-phase unbalance and harmonic interference are the most concerned issues of power quality today. [0003] For the detection of fundamental reactive power and harmonic problems, the commonly used methods include Fourier transform, instantaneous reactive power method, synchronous measurement method and other algorithms. For the detection of three-phase unbalance, the commo...

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Application Information

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IPC IPC(8): G01R19/06G01R23/16G06F17/14
CPCG01R19/06G01R23/16G06F17/141
Inventor 徐文涛王思敏牛轲张鹏程郭志强宁振
Owner 徐文涛
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