Plug and play integrated modular active harmonic isolator

An integrated module, plug-and-play technology, used in harmonic reduction devices, AC networks to reduce harmonics/ripples, transformers/inductor cores, etc., can solve problems such as low power factor and harmonics, and achieve Simple access, continuously adjustable impedance effect

Active Publication Date: 2017-09-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Aiming at the defects of the prior art, the purpose of the present invention is to provide a plug-and-play integrated modular active harmonic isolator, aiming to solve the problems of harmonics and low power factor caused by nonlinear devices

Method used

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  • Plug and play integrated modular active harmonic isolator
  • Plug and play integrated modular active harmonic isolator
  • Plug and play integrated modular active harmonic isolator

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Embodiment Construction

[0041] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0042] The present invention is based on the principle of an adjustable reactor with controllable magnetic flux, by actively injecting a current with the same frequency and opposite phase to the primary side current on the secondary side of a special transformer with an air gap in the iron core. , Changing the size of the injection current on the secondary side of the special transformer can realize the continuous adjustment of the main magnetic flux of the transformer, so as to realize the continuous adjustment of the impedance of the primary side of the transformer. Compared with the existing adj...

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Abstract

The invention discloses a plug and play integrated modular active harmonic isolator. The plug and play integrated modular active harmonic isolator comprises a current detection module, an inversion control module and a special transformer; the current detection module is used for detecting a fundamental current in the grid-entering current, and a feedback current which is generated by applying a voltage to the secondary side of the special transformer through an inverter; the special transformer comprises a primary side winding and a secondary side winding, wherein the primary side winding is used as a busbar to be connected to the power grid; the secondary side winding is wound in the axial direction, and is connected with the output end of the inversion control module; the input end of the inversion control module is connected with the direct current side voltage; the control end of the inversion control module is connected to the output end of the current detection module; and the inversion control module is used for outputting a control voltage for controlling the secondary side of the transformer to generate the feedback current according to a reference current signal. By adoption of the closed current transformer or open transformer access mode, simple access and no influence to the structure of the power grid are realized.

Description

technical field [0001] The invention belongs to the technical field of active power filters, and in particular relates to an active harmonic isolator. Background technique [0002] The urgent need for green energy and energy conservation and environmental protection has promoted the development of power electronics technology. Power electronics devices are nonlinear devices, and harmonic and power factor problems are inevitable. Passive power filters and active power filters are currently the most studied Two filtering schemes that are mature and widely used. Passive filter technology is mature, low cost, high reliability, and can be used in high and low voltage systems; in practical applications, passive filters have the following disadvantages: [0003] 1) The filtering effect is very dependent on the internal resistance of the system. In a low-voltage system, the internal resistance of the system is very small, and the filtering effect is greatly reduced; [0004] 2) An...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H01F27/24
CPCH01F27/24H02J3/01Y02E40/40
Inventor 李达义
Owner HUAZHONG UNIV OF SCI & TECH
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