Phase imbalance detection method, system and device for distribution transformer and storage medium

A phase unbalanced, distribution transformer technology, applied in the field of distribution transformer phase unbalance detection method, system, device and storage medium, can solve the problems of long detection time and difficult monitoring of harmonic analysis method, and achieve enhanced timeliness , the effect of reducing the time lag

Pending Publication Date: 2021-11-09
STATE GRID BEIJING ELECTRIC POWER +1
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Problems solved by technology

[0005] The object of the present invention is to provide a distribution transformer phase unbalance detection method, system, device and storage medium, to solve the problem in the prior art that the detection time of the Park transformation method and the harmonic analysis method is long when the distribution transformer unbalance degree is detected , difficult problems to monitor

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  • Phase imbalance detection method, system and device for distribution transformer and storage medium
  • Phase imbalance detection method, system and device for distribution transformer and storage medium
  • Phase imbalance detection method, system and device for distribution transformer and storage medium

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Embodiment approach

[0049] 1. First, the existing Park transformation and other methods are introduced. Based on the traditional Park transform phase detection algorithm. details as follows:

[0050] The traditional Park transform is also called dq transform, which is basically defined as: A, B, C three-phase signals are projected onto the rotating direct axis (d axis), quadrature axis (q axis) and zero axis (0 axis) perpendicular to the dq plane. axis), the three-phase signal is converted into a rotating two-phase signal, and the relationship between the A, B, and C three-phase signals and the transformed d, q axis signals is described by formula (1).

[0051]

[0052] In formula (1), ω is the angular frequency of the system, and its expression is ω=2πf 0 (f 0 is the fundamental frequency of the system); V a , V b , V c They represent the three-phase voltages of A, B, and C respectively, and the phase angle difference between each two phases is 120°. At this time, the three phases are b...

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Abstract

The invention discloses a phase imbalance detection method, system and device for a distribution transformer and a storage medium. The method comprises the following steps: extracting a positive sequence component, a negative sequence component and a zero sequence component of a three-phase voltage in a dq-axis rotating coordinate system; performing Park transformation on the positive sequence component, the negative sequence component and the zero sequence component, and synchronizing a dq-axis rotating coordinate system and an unbalanced three-phase system by using a phase-locked loop; obtaining values of the positive sequence component, the negative sequence component and the zero sequence component in the dq-axis rotating coordinate system; performing inverse Park transformation on the values of the positive sequence component, the negative sequence component and the zero sequence component in the dq-axis rotating coordinate system to obtain a three-phase voltage value with an imaginary part; according to the three-phase voltage value with the imaginary part, calculating the amplitude and the phase through an MATLAB algorithm, and detecting the phase imbalance state of the distribution transformer according to the amplitude and the phase. The time delay of phase estimation can be effectively reduced, the timeliness is enhanced, and the imbalance of the amplitude and/or phase angle of each phase A, B and C in a three-phase imbalance state can be accurately reflected.

Description

technical field [0001] The invention belongs to the technical field of power equipment detection, and in particular relates to a distribution transformer phase unbalance detection method, system, device and storage medium. Background technique [0002] According to the operation regulations of the distribution network of the State Grid Corporation of China, the unbalance degree of the distribution transformer should not exceed 15%, and the neutral line current should not exceed 25% of the rated current. Traditional fault detection methods for distribution transformers at the low-voltage side mainly include Park transform method and harmonic analysis (Fast Fourier Transform, FFT) method. [0003] Park transformation must be based on the premise of completely symmetrical three-phase current. When the distribution transformer is in a three-phase unbalanced state, each single phase of the A, B, and C phases will generate high-frequency harmonics after Park transformation, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/16
CPCG01R29/16
Inventor 吴钢焦阳陈默王远任宇驰徐峥唐皓淞郑朗
Owner STATE GRID BEIJING ELECTRIC POWER
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