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Five-level dual-buck parallel active power filter (APF) and dual-frequency half-wave control method thereof

A power filter, double step-down technology, applied in active power filtering, reactive power adjustment/elimination/compensation and other directions, can solve the problem of insufficient compensation capability of parallel active filters

Inactive Publication Date: 2012-12-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to realize high-reliability and large-capacity harmonic and reactive power filtering functions for single-phase and three-phase high-power grids with electric energy pollution, and to avoid unreliable safety hazards such as bridge arm straight-through, A five-level dual-buck shunt active power filter and its dual-frequency half-wave control method are proposed to overcome the insufficient compensation capability of the parallel active power filter with a half-bridge structure, effectively use the DC side capacitor voltage, and reduce the power of each power device. Voltage level, and improve the harmonic compensation characteristics of the active power filter

Method used

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  • Five-level dual-buck parallel active power filter (APF) and dual-frequency half-wave control method thereof
  • Five-level dual-buck parallel active power filter (APF) and dual-frequency half-wave control method thereof
  • Five-level dual-buck parallel active power filter (APF) and dual-frequency half-wave control method thereof

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Embodiment 1

[0081] attached figure 1 It is a schematic diagram of the parallel structure of the double step-down five-level parallel active power filter of the present invention.

[0082] A dual step-down five-level parallel active power filter parallel structure, including a first module I and a second module II, wherein the first module I includes a first bridge arm, a second bridge arm, and a third bridge arm , the first capacitor on the DC side and the first parallel dual inductor on the AC side; where the first bridge arm is composed of the first power transistor S 1 source and the first diode D 1 The cathode is connected; the second bridge arm is formed by the second power tube S 2 drain with the second diode D 2 The anodes are connected; the third bridge arm is formed by the third power tube S 3 Source and fourth power tube S 4 The drains are connected; the first power tube S in the first bridge arm 1 Drain, the second diode D in the second bridge arm 2 Cathode, the third p...

Embodiment 2

[0096] Figure 4 It is a schematic diagram of the series structure of the double step-down five-level parallel active power filter of the present invention.

[0097] A series structure of a five-level double-buck parallel active power filter, including the first module I and the second module II, which differs from the parallel structure of a five-level double-buck parallel active power filter in that : the connection form of the first module Ⅰ and the second module Ⅱ and the connection point between the active power filter and the grid;

[0098] The third power tube S in the third bridge arm 3 Source, fourth power tube S 4 The third inductance L in the drain and the second parallel dual inductance 3 with the fourth inductance L 4 The connection points of all are connected, as the connection point of the first module I and the second module II; the first inductance L 1 and the second inductance L 2 The connection point of the seventh power tube S in the sixth bridge arm ...

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Abstract

The invention provides a five-level dual-buck parallel active power filter (APF) and a dual-frequency half-wave control method thereof, belonging to the technical field of power harmonic suppression. The five-level dual-buck parallel APF comprises two same modules, wherein each module comprises a single power tube, a diode series bridge arm, a dual-power tube series bridge arm, an AC side parallel double inductor and a DC side capacitor. In the dual-frequency half-wave control method, current high-frequency half-wave control is adopted for the single power tube and the diode series bridge arm, and voltage low-frequency half-wave control is adopted for the dual-power tube series bridge arm. By using the five-level dual-buck parallel APF and the dual-frequency half-wave control method thereof, the system reliability can be improved, the tracking accuracy of compensating current is higher, and compensating effects are more ideal.

Description

technical field [0001] The invention relates to a five-level dual-step-down parallel active power filter and a dual-frequency half-wave control method thereof, which are suitable for various medium and high-power electrical systems requiring high reliability, and belong to the technical field of electric harmonic suppression . Background technique [0002] Due to the increasingly widespread application of power electronic devices, harmonic and reactive power problems have attracted more and more attention. At the same time, it is precisely because of the rapid development of power electronics that some breakthroughs have been made in harmonic suppression and reactive power compensation. Suppressing the harmonics in the power grid and improving the power factor of the device has become a major topic in the research fields of power electronics and power systems. [0003] At present, an important trend of harmonic suppression is the use of active power filters. Based on powe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCY02E40/22Y02E40/20
Inventor 陈仲陈淼石磊
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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