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Parallel-connection active power filter suitable for three-phase four-wire power grid system

A power filter and power grid system technology, which is applied in active power filtering, multi-phase network asymmetry reduction, AC network to reduce harmonics/ripples, etc., can solve electromagnetic interference of electronic equipment, degradation of power supply quality of the power grid, The problem of increasing energy loss in the power system can achieve the effect of eliminating voltage fluctuations at the DC terminal, solving three-phase imbalance problems, and compensating for harmonic currents in the power grid.

Inactive Publication Date: 2014-01-22
江西中能电气科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The harm of harmonics in the power grid is extremely harmful. It will distort the waveform of the power supply voltage of the power grid, reduce the quality of power supply, increase the energy loss of the power system, shorten the life of power supply equipment, and cause electromagnetic interference to other electronic equipment.

Method used

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  • Parallel-connection active power filter suitable for three-phase four-wire power grid system
  • Parallel-connection active power filter suitable for three-phase four-wire power grid system
  • Parallel-connection active power filter suitable for three-phase four-wire power grid system

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no. 1 example

[0035] Refer below figure 1 A first embodiment of the present invention will be described.

[0036] figure 1 It is a schematic structural diagram of a shunt-connected active power filter (hereinafter also referred to as an active power filter) suitable for a three-phase four-wire grid system according to a first embodiment of the present invention.

[0037] like figure 1 As shown, the active power filter, the active power filter applicable to the three-phase four-wire power grid system according to this embodiment includes a three-phase full-bridge inverter circuit 111, which communicates with the three-phase four-wire power grid system via a three-phase inductor Electrical connection for grid connection to a three-phase four-wire grid system. Among them, the three-phase full-bridge inverter circuit 111 is composed of three groups of bridge arms connected in parallel, each group of bridge arms is composed of two power switch tubes connected in series, the power switch tubes...

no. 2 example

[0059] This embodiment is a further improvement on the first embodiment. For ease of description, the same structures as those of the foregoing embodiments will not be described in detail, but only the differences from the foregoing embodiments will be highlighted.

[0060] figure 2 It is a structural schematic diagram of an active power filter suitable for a three-phase four-wire grid system according to the second embodiment of the present invention.

[0061] refer to figure 1 and figure 2 The inverter and chopper circuit 110 is electrically connected to the dual capacitors 120 at the DC end, wherein the inverter and chopper circuit 110 is composed of a three-phase full-bridge inverter circuit 111 and a half-bridge chopper circuit 112 connected in parallel.

[0062] In particular, the active power filter of this embodiment further includes a control module. The control module adopts a double closed-loop control strategy including a voltage loop submodule 130 and a curr...

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Abstract

The invention discloses a parallel-connection active power filter suitable for a three-phase four-wire power grid system, which mainly comprises a three-phase full-bridge inverter circuit, a half-bridge chopper circuit and two capacitors; the three-phase full-bridge inverter circuit is electrically connected with the three-phase four-wire power grid system and connected in parallel with the half-bridge chopper circuit; and the other side of the half-bridge chopper circuit is electrically connected with a midpoint of the two capacitors at a direct-current side through an inductance, and the half-bridge chopper circuit is used for controlling the direct-circuit side voltage of the parallel-connection active power filter. A double close-loop control mode is adopted in the invention, wherein the inner ring is a voltage ring which is used for providing energy feedforward for controlling the direct-current end voltage stabilization and restraining zero-sequence current perturbance; and the outer ring is a current ring which is used for controlling the output current of the parallel-connection active power filter. Compared with the prior art, the parallel-connection active power filter with the double close-loop control structure can be used for preferably compensating the power grid harmonic current and restraining three-phase imbalance.

Description

technical field [0001] The invention relates to a parallel active power filter suitable for a grid system, in particular to a parallel active power filter suitable for a three-phase four-wire grid system. Background technique [0002] With the continuous development of power electronic technology, more and more power electronic devices are widely used in various fields, and at the same time, a large number of harmonics are injected into the power grid. Harmonics in the power grid are extremely harmful. It will distort the waveform of the power supply voltage of the power grid, reduce the quality of power supply, increase the energy loss of the power system, shorten the life of power supply and consumption equipment, and cause electromagnetic interference to other electronic equipment. [0003] As the power quality problems caused by grid harmonics have been paid more and more attention, Active Power Filter (APF) as a new type of power electronic device that dynamically suppr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/26
CPCY02E40/50Y02E40/40Y02E40/22Y02E40/20
Inventor 董密杨建粟梅孙尧于晶荣王辉敖杰肖亮
Owner 江西中能电气科技股份有限公司
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