Serial hybrid active filter including harmonic absorber

A filter and hybrid technology, applied in AC network to reduce harmonics/ripples, harmonic reduction devices, etc., can solve the problems of complex parameter design and large number of passive filter units, and achieve good filtering effect and no The effect of simplifying the source part and simplifying the design

Inactive Publication Date: 2017-10-03
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0010] Aiming at the defects of the prior art, the object of the present invention is to provide a series hybrid filter with a harmonic absorber, aiming to solve the problem of the l

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  • Serial hybrid active filter including harmonic absorber
  • Serial hybrid active filter including harmonic absorber
  • Serial hybrid active filter including harmonic absorber

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Embodiment Construction

[0026] 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.

[0027] The present invention proposes a scheme for simplifying the design of the passive filter part when the equivalent impedance of the series part of the above-mentioned third and fourth series hybrid active power filters is very large. The solution proposed by the invention can solve the problem of passive filter design, making the design of the passive filter simple, and at the same time, it can ensure the filtering of high-order harmonics on the load side and prevent the load harmonics from flowing into the power grid.

[0028] In the series hybrid filter provided by the embodiment of the pre...

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Abstract

The invention discloses a serial hybrid active filter including a harmonic absorber. The serial hybrid active filter comprises an active filter unit and a passive filter unit, wherein the active filter unit comprises a transformer, an inverter and a detection control unit; a primary side AX of the transformer is connected in series to a power grid; a secondary side of the transformer is connected with the inverter; the detection control unit is used for detecting a voltage or current signal of the primary side, and driving and controlling the on/off of a switch tube of the inverter to generate a voltage or current to be applied to the secondary side of the transformer, so that the primary side AX of the transformer presents low impedance to fundamental waves and presents high impedance to harmonic waves; and the passive filter unit comprises LC series-parallel branches which are connected in parallel to two ends of a harmonic source load. During working, the active filter unit presents low impedance to the fundamental waves and presents high impedance to high-order harmonic waves. A serial part of the passive filter unit generates series resonance at m-order harmonic frequency, and absorbs m-order harmonic current, so that the harmonic waves flow through the passive filter unit instead of flowing into the power grid, and a function of filtering the harmonic waves is realized.

Description

technical field [0001] The invention belongs to the technical field of power filters, and in particular relates to a series hybrid active filter with a harmonic absorber. Background technique [0002] With the rapid development of power electronic device manufacturing technology and converter technology, power electronic technology has been widely used in industrial manufacturing, household appliances, large shopping malls and office buildings, medical institutions, smart grids and other occasions. Since the power electronic device is a nonlinear load, its large-scale application will inevitably bring problems of harmonic interference and low power factor. The problem of harmonic interference can be solved by filtering. Passive filters are currently the most widely used filters. method, but to achieve a good filtering effect, the number of filtering branches of the passive filter must be increased, and the volume of the passive filter is increased. At the same time, the equi...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 李达义余天保胡晶杨凯
Owner HUAZHONG UNIV OF SCI & TECH
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