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Parallel-connection type active power filter

A technology of power filter and parallel connection, which is applied in active power filter, harmonic reduction device, AC network to reduce harmonic/ripple, etc. It can solve the problems of smaller current ripple and weakened tracking ability

Inactive Publication Date: 2013-10-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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Problems solved by technology

On the contrary, the current ripple becomes smaller and the tracking ability is weakened

Method used

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  • Parallel-connection type active power filter
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  • Parallel-connection type active power filter

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Embodiment Construction

[0047] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0048] like figure 1 Shown is the schematic diagram of a conventional parallel active current filter. In order to suppress the large di / dt brought by the uncontrolled rectification circuit, a three-phase filter inductor 40 is added to the AC side of the uncontrolled rectification circuit. The current includes fundamental wave current and harmonic current, and the inductance loss is relatively large. The present invention integrates the three-phase filter inductance 40 and the compensation-side three-phase inductance 50 of the conventional parallel active filter to form the parallel active power filter of the present invention.

[0049] like figure 2 Shown, the ideal equivalent circuit of the conventional shunt active filter. The load is equivalent to containing the fundamental current i S and harmonic current The current source I L , the compens...

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Abstract

The invention discloses a parallel-connection type active power filter which belongs to the field of power harmonic wave suppression technology. The parallel-connection type active power filter comprises a three-phase filter inductor (10), a three-phase six-switch inverter (20) and a three-phase rectifier filter circuit, wherein the three-phase six-switch inverter (20) comprises a compensation three-phase inductor (21), a three-phase inverter (22) and a capacitor (23). Three-phase voltage of an external power grid is input to one end of the three-phase filter inductor (10), while the other endof the three-phase filter inductor (10) is respectively connected with the three-phase six-switch inverter (20) and the three-phase rectifier filter circuit. The parallel-connection type active powerfilter can effectively reduce the inductance value of the compensation three-phase inductor (21), improve the trace ability of current, improve the compensation property of the filter and has wide application prospect in the aspect of power grid harmonic wave treatment.

Description

technical field [0001] The invention relates to a parallel active power filter, which belongs to the technical field of power harmonic suppression, and is especially suitable for medium frequency power grid systems and also for power frequency power grid systems. Background technique [0002] With the development of power electronics technology, the application of electronic equipment is becoming more and more extensive. Equipment performance and service life. Therefore, controlling the harmonic pollution of power grid and improving the quality of power supply has become an urgent problem to be solved. As one of the effective means of harmonic control, active power filter has been extensively studied. At present, the relatively mature active power filter technology is mainly based on the parallel structure, and its topology is as follows: figure 1 As shown, in order to suppress the large di / dt brought by the uncontrolled rectification circuit, a three-phase filter inducto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/18
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 胡海兵石巍邢岩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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