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Improved parallel mixed active power filter

A power filter, source filter technology, applied in active power filter, AC network to reduce harmonics/ripples and other directions, can solve the problem of reducing the compensation efficiency of the active part, achieve simplified design, reduce capacity requirements, The effect of improving the efficiency of harmonic compensation

Inactive Publication Date: 2017-06-20
魏莹
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  • Abstract
  • Description
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Problems solved by technology

In the improved structure of the injection active filter, the fundamental resonance branch will shunt the harmonics, reducing the compensation efficiency of the active part

Method used

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Embodiment Construction

[0017] specific implementation plan

[0018] figure 1 Among them, the high-order harmonics generated by the inverter circuit are mainly filtered; and the secondary side of the isolation transformer is subjected to a lower fundamental voltage while taking into account the governance function of a specific harmonic; and the passive resonant branch formed as For a specific secondary passive filter, its impedance is assumed to be Z2; the voltage ratio of the isolation transformer is (grid side voltage: valve side voltage). Compared with the traditional parallel hybrid active filter, there is no series structure of inductance and capacitance on the harmonic injection channel behind the isolation transformer of this new topology, so there is no problem of blocking the injection of harmonic current when the resonant branch is off-harmonic Phenomenon.

[0019] figure 2 Among them, the time period of a pulse signal generated by the hysteresis controller constitutes the quadrilatera...

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Abstract

An improved parallel mixed active power filter includes three parts: a novel parallel mixed active filter, fixed-frequency hysteresis control and active power filter control. A harmonic injection branch has no impedance for blocking compensation current injected into a power grid and ensures that an active part only bears very low fundamental voltage, thereby reducing the capacity requirement of the active part and improving the harmonic compensation efficiency of the active part. The fixed-frequency hysteresis control enables the output current of an inverter to have harmonic current with fixed frequency, thereby simplifying the design of an output filter.

Description

[0001] Technical field [0002] The invention relates to an active power filter, in particular to an improved parallel hybrid active power filter. Background technique [0003] With the extensive application of power electronic equipment, various nonlinear loads lead to current waveform distortion, and a large number of harmonic currents are generated in the power grid, so harmonic control devices have been widely studied and applied. [0004] At present, there are two main filtering devices at home and abroad: passive filters and active filters. Among them, the passive power filter is mainly used to filter out the harmonics of the high-voltage power grid, but the passive filter is easy to cause resonance, and can only filter out a single harmonic, making it difficult to meet the demand. Although the active power filter can overcome the defects of the passive filter, it is difficult to operate independently on the high-power medium-voltage power grid due to the limitation of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 魏莹
Owner 魏莹