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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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] Every time the sliding operation is performed, the twiddle factor must be multiplied, and the operation errors cannot cancel each other out, so the errors will continue to accumulate

Method used

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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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Embodiment Construction

[0052] The core of the present invention is to provide a method for detecting fundamental reactive power, three-phase unbalance and harmonics based on SDFT algorithm. cumulative error.

[0053] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0054] Figure 4 It is a flow chart of the fundamental reactive power and unbalanced current detection method provided by the embodiment of the present invention, the method includes:

[0055] S100. Sampling the three-phase current signal at a sampling frequency a...

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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...

Claims

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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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