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Harmonic detection method applied to power distribution network

A harmonic detection and distribution network technology, applied in the field of power systems, can solve problems such as poor detection accuracy, and achieve the effect of simple method, simple and fast calculation method, and high harmonic detection accuracy

Inactive Publication Date: 2017-05-31
合肥普望电子有限责任公司
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Problems solved by technology

[0005] The purpose of the present invention is to provide a harmonic detection method applied to the distribution network to solve the problem of poor detection accuracy in the harmonic detection method of the power grid

Method used

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  • Harmonic detection method applied to power distribution network
  • Harmonic detection method applied to power distribution network
  • Harmonic detection method applied to power distribution network

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with accompanying drawing:

[0023] Such as figure 1 As shown, a harmonic detection method applied to distribution network includes the following steps:

[0024] S1: Obtain the harmonic data of all typical harmonic sources in the grid monitoring system;

[0025] S2: Display the location where each harmonic source is connected to the power system;

[0026] S3: Obtain the voltage and current of the harmonic source, and analyze the voltage and current of each harmonic source;

[0027] S4: Use the following formula to calculate the harmonic frequency, and draw the harmonic curve according to the harmonic frequency of the harmonic source:

[0028]

[0029] where x s (k) is the harmonic frequency, A is the amplitude, f 0 is the fundamental frequency, f s is the sampling frequency, θ is the phase angle;

[0030] S5: According to the harmonic frequency, judge the voltage level of the harmonic source,...

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Abstract

The invention relates to a harmonic detection method applied to a power distribution network. The method comprises the following steps of (1) obtaining harmonic data of all typical harmonic sources in the grid monitoring system; (2) showing the position of each harmonic source accessing the power system; (3) obtaining the voltage and current of the harmonic source, and analyzing the voltage and current of each harmonic source; (4) calculating the harmonic frequency according to the following formula, and drawing the harmonic curve according to the harmonic frequency of the harmonic source, and (5) judging the harmonic voltage level according to the harmonic frequency. The method has the advantages that the method is simple and quick in calculation and high in harmonic detection precision, the harmonic voltage level is analyzed by calculating the harmonic frequency, and the grid synchronization angle is not required, and the method can be used for single-phase, three-phase three-wire or three-phase four-wire systems for the detection of harmonic components.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a harmonic detection method applied to a power distribution network. Background technique [0002] Non-integral harmonics of the fundamental frequency, ie interharmonics, may also be generated by non-linear loads in the power system in addition to the integral harmonics of the fundamental frequency. According to IEC-61000-2-1, interharmonic (Interharmonic) is defined as: between the harmonic components of voltage and current signals, there is a signal whose frequency is not an integer multiple of the fundamental frequency, which is manifested as a discrete spectrum or broadband spectrum. The various impacts of harmonic pollution on the power grid are manifested in: reducing the efficiency of the power supply and distribution system and increasing the loss of the power grid at all levels; bringing additional losses to various electrical equipment and shortening the life; af...

Claims

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Application Information

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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 顾孙珺孙平陆华俊孙国庆
Owner 合肥普望电子有限责任公司
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