A method and device for extracting and utilizing harmonics on the secondary side of a distribution transformer

A technology for distribution transformers and harmonic extraction, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, electrical components, etc., to reduce impacts, improve power quality, and achieve full utilization

Active Publication Date: 2017-08-25
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the harmonics generated by the user side of the distribution transformer have a certain impact on the power grid, it is also a kind of electric energy itself.

Method used

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  • A method and device for extracting and utilizing harmonics on the secondary side of a distribution transformer
  • A method and device for extracting and utilizing harmonics on the secondary side of a distribution transformer
  • A method and device for extracting and utilizing harmonics on the secondary side of a distribution transformer

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Embodiment Construction

[0029] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] The basic idea of ​​the method of the present invention is to separate and extract characteristic sub-harmonics with high content through monitoring and analyzing the harmonic content in the distribution network, and finally store the harmonic electric energy. The core is to separate and extract the characteristic sub-harmonics: based on the principle of passive power filters, the resonant RLC circuit of the main characteristic sub-harmonics is used to separate the harmonics. Among them, part of the inductance used in the passive filter circuit is replaced by a coupled inductance. Coupled inductors have energy coupling characteristics, which can realize the extraction of harmonic electric energy (harmonic separation, extraction stage). After the extraction, the harmonic electric energy is stored in the energy storage device through ...

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Abstract

The invention relates to a method and device for extracting and using a secondary side harmonic wave of a distribution transformer, and belongs to the technical field of power. The method comprises the steps: harmonic monitoring and analysis, harmonic separation and extraction, and harmonic recycling; the analysis and processing of a harmonic wave are carried out in a power distribution network at the step of harmonic monitoring and analysis, so that a technician adjusts related parameters. The step of harmonic separation and extraction comprises two steps: separation and extraction. The resonance filtering principle of a passive power filter is employed in the step of separation, so as to separate a characteristic subharmonic from a power circuit; the coupling principle of a mutual induction coil is employed for the step of extraction, so as to lead a harmonic current to a subsequent circuit for extraction. The harmonic current is converted into DC electric energy for storage at the step of harmonic recycling, thereby achieving the recycling of the harmonic electric energy. According to the invention, the method and device enable the harmonic electric energy to be separated, extracted and stored, can reduce the impact on a power grid from harmonic, improve the quality of electric energy, achieve the complete use of the electric energy, and are of great significance to the energy-saving and loss-reducing research.

Description

technical field [0001] The invention belongs to the field of electric power technology and relates to a harmonic extraction and utilization technology, in particular to a method and device for extracting and utilizing harmonics at the secondary side of a distribution transformer. Background technique [0002] With the sound economic development of our country and other countries in the world, the demand for electric power is relatively large at present, and there is still a lot of room for electric power construction. Regional power grids are also speeding up the pace of planning and design. Northeast China Power Grid, North China Power Grid, Central China Power Grid, East China Power Grid, and Northwest Power Grid are planned differently according to their regional cities and industrial energy sources, etc., but they all emphasize the need to increase investment in science and technology to improve the technological content and power quality of power grids. Actively promot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J15/00
CPCY02E40/40
Inventor 张占龙黄松渝韩升左磊
Owner CHONGQING UNIV
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