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Tandem type neutral line dynamic active harmonic damper

A series-type, center-line technology, applied to harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the problem of high cost of active filters, achieve powerful data processing functions, simple wiring, IGBT switching devices little effect

Active Publication Date: 2013-09-25
LIVESINE ELECTRIC SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the cost of active power filters is relatively high. For some sites that only care about the neutral current and limited operating space, traditional active power filters cannot meet the needs of engineering applications.

Method used

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  • Tandem type neutral line dynamic active harmonic damper
  • Tandem type neutral line dynamic active harmonic damper

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Experimental program
Comparison scheme
Effect test

Embodiment

[0028] An ACT-N-Sine series neutral dynamic active harmonic elimination device, including a main circuit and a control circuit, the main circuit is connected to the control circuit, and the two ends of the main circuit are respectively connected to the neutral circuit of the load and the neutral line of the power system circuit. A special 3N harmonic extraction sampling module is used in the control circuit. Due to the characteristics of harmonics, the harmonic content flowing into the neutral line must be 3N harmonics. In order to improve the speed and accuracy of harmonic analysis, 3N harmonic extraction sampling The module quickly extracts the 3N harmonic current content from the neutral current signal through a set of high-precision analog signal modulation circuit, digitizes it and obtains the impedance of the neutral harmonic through analysis and calculation; the control circuit adjusts the impedance of the LC filter path and Make it match the harmonic impedance of the n...

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Abstract

The invention relates to a tandem type neutral line dynamic active harmonic damper which comprises a main circuit and a control circuit. The main circuit is connected with the control circuit. The two ends of the main circuit are connected with a neutral line loop of a load and a neutral line loop of an electric power system respectively. The control circuit obtains the harmonic impedance in a neutral line by sampling, controls the main circuit to enable the impedance of an LC filtering channel in the main circuit to be matched with the harmonic impedance of the neutral line and eliminates the harmonic content of the neutral line. Compared with the prior art, the tandem type neutral line dynamic active harmonic damper has the advantages of being high in data conversion precision, good in harmonic cancellation effect, convenient to mount and the like.

Description

technical field [0001] The invention relates to an active harmonic elimination device, in particular to a serial neutral line dynamic active harmonic elimination device. Background technique [0002] With the development of modern industry and the improvement of people's living standards, the requirements for power quality are getting higher and higher. Therefore, continuously improving the quality of power supply has become an urgent task for the power sector. Harmonic content is an important index to measure the economic operation of power system. [0003] In modern industrial systems, such as steel-making electric arc furnaces, electrified railways, and reversible large-scale rolling mills, etc., all belong to dynamically changing nonlinear loads. This type of load is characterized by rapid changes in active and reactive power over time, resulting in fluctuations and flickering of the supply voltage, waveform distortion of the supply voltage, deterioration of the power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 舒观澜
Owner LIVESINE ELECTRIC SHANGHAI CO LTD
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