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Three-phase unbalance degree detection method and device based on convolution window function

A detection method and a balance degree technology are applied in the field of three-phase unbalance degree detection and device based on convolution window function, which can solve the problems of slow calculation speed, low detection accuracy, spectrum leakage and fence effect, etc., and achieve a good frequency spectrum. Leakage, improve detection accuracy, and suppress the effect of spectrum leakage

Pending Publication Date: 2021-06-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0003] Most of the existing three-phase unbalance detection methods use Fast Fourier Transformation (FFT) to calculate the fundamental component, and then use the symmetrical component method to detect the positive sequence, negative sequence and zero sequence phase in the fundamental component. sequence component, but this method involves the calculation of the square root and phase angle in the operation, the calculation speed is slow, and it is prone to spectrum leakage and fence effect in the non-sampling process, resulting in low detection accuracy

Method used

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  • Three-phase unbalance degree detection method and device based on convolution window function
  • Three-phase unbalance degree detection method and device based on convolution window function
  • Three-phase unbalance degree detection method and device based on convolution window function

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Embodiment 1

[0055] Three-phase unbalance detection method based on convolution window function

[0056] Such as figure 2 As shown, the three-phase unbalance detection method based on the convolution window function includes the following steps:

[0057] Step 1: Establish the corresponding relationship between phase sequence components and voltage fundamental components.

[0058] First, establish a voltage single-phase signal model.

[0059] Assuming that the voltage signal contains H harmonics, the sampling frequency f s After sampling the single-phase signal, we get:

[0060]

[0061] In the formula, A h Indicates the voltage amplitude of each harmonic of the signal, f h Indicates the frequency of each harmonic, f s Indicates the signal sampling frequency, Φ h Indicates the phase of each harmonic of the signal.

[0062] The detection of three-phase unbalance is divided into two stages. On the basis of detecting the voltage fundamental component, the symmetrical component meth...

Embodiment 2

[0168] Three-phase unbalance detection device based on convolution window function and partition method

[0169] The detection device includes a memory and a processor, and a computer program is stored on the memory, and the computer program executes the above method when run by the processor. A computer program includes computer program code, which may be in the form of source code, object code, executable file, or some intermediate form, etc.

[0170] Memory includes any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signals, telecommunication signals, and software distribution media, etc.

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Abstract

The invention relates to a three-phase unbalance degree detection method and device based on a convolution window function. The method comprises the following steps: establishing a corresponding relation between a phase sequence component and a voltage fundamental component; performing windowing correction processing on the single-phase voltage signal through the convolution window spectrum function to obtain a windowed single-phase voltage signal; performing spectral analysis on the windowed single-phase voltage signal to obtain a voltage fundamental wave amplitude correction function and a phase correction function, and obtaining a voltage fundamental wave amplitude and a phase parameter; and according to the voltage fundamental wave amplitude and the phase parameter, calculating the phase sequence component of the voltage fundamental wave component through a partitioning method, and obtaining the three-phase unbalance degree. The three-phase unbalance degree detection efficiency is high, and the detection precision is high.

Description

technical field [0001] The invention relates to a three-phase unbalance degree detection method and device based on a convolution window function. Background technique [0002] With a large number of applications of various nonlinear loads, the power quality continues to deteriorate, and there may be negative sequence components in the voltage or current. Negative sequence components will cause heating and vibration of the motor, reduce operating efficiency, increase transformer magnetic flux leakage, cause partial overheating of the transformer, reduce service life, cause malfunction of relay protection devices, threaten the safety of the power system, and reduce the quality of the communication system. Based on the importance of improving power quality to the power grid and people's lives, the detection of three-phase unbalance has become an important topic. In order to ensure the safe and stable operation of the power system, real-time detection of three-phase unbalance i...

Claims

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Application Information

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IPC IPC(8): G01R29/16G06F17/15
CPCG01R29/16G06F17/153Y02E40/50
Inventor 许国瑞胡沛东
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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