12 pulse rectifier based on harmonic injection of DCM converter and control method thereof

A technology of pulse rectification and harmonic injection, applied in the direction of irreversible AC power input conversion to DC power output, output power conversion device, electrical components, etc., can solve the problems of complex circuit control, large loss, and inability to adapt to load changes, etc. , achieve the effect of reducing THD and simplifying the control loop

Inactive Publication Date: 2013-01-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of complex circuit control when using a converter for harmonic injection and the inability to adapt to load changes and large losses when using an external resistor for harmonic injection, and propose a converter based on DCM (including critical continuous mode) 12-pulse rectifier with wave injection

Method used

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  • 12 pulse rectifier based on harmonic injection of DCM converter and control method thereof
  • 12 pulse rectifier based on harmonic injection of DCM converter and control method thereof
  • 12 pulse rectifier based on harmonic injection of DCM converter and control method thereof

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Embodiment 1

[0053] attached figure 1 Shown is a schematic structural diagram of a 12-pulse rectifier using a DCM mode AC-DC converter for harmonic injection, including a 12-pulse rectifier circuit and a DCM mode AC-DC converter. Among them, the 12-pulse rectification circuit includes a three-phase voltage source 1; a phase-shifting transformer 2; a three-phase rectification bridge 3, 4; harmonic injection balance reactors 5, 6 and an output circuit 10. The AC-DC converter in DCM mode includes a harmonic injection circuit including an LC filter circuit 7 , a single-phase rectifier bridge 8 , a power converter 9 and a control loop 11 . Harmonic injection balance reactors 5 and 6 each add a winding, connect the opposite ends of the two additional windings, and the two ends of the same name are used as the input of the AC-DC converter working in DCM mode; the AC-DC converter in DCM mode The output of the 12-pulse rectifier circuit is connected to the output filter capacitor. Among them, th...

Embodiment 2

[0055] by Figure 20 The P-type 12-pulse autotransformer rectifier based on the DCM mode flyback converter for harmonic injection is taken as an example, and its working principle is described. and are the turns of the long and short windings, respectively. The waveform of the input current as Figure 26 As shown by the dotted line in the middle, multiple square waves are superimposed to form a ladder wave. The dotted lines in (a)-(g) are the phase current waveforms of the P-type 12-pulse autotransformer output phases a', a", b', c', and c", respectively. a The expression for the phase input current is , ( f ) The dotted line is the input current of phase a, and its THD is relatively large. The principle of harmonic injection in the present invention is to inject harmonics so that the current at the output side of the phase-shifting transformer is formed as Figure 26 The triangular waveform shown in the solid line (a)-(g) is converted to the AC side to form a sinuso...

Embodiment 3

[0062] attached Figure 29 middle i Lp It is the primary side current of the flyback converter, and its waveform tracks the change of the input voltage very well. After L f 、C f After filtering i x In order to balance the current waveform in the secondary winding of the reactor, the triangular harmonic current needs to be injected. attached Figure 30 middle It is the output of the phase-shifting transformer after harmonic injection phase current waveforms, with the attached Figure 26 The waveforms in the theoretical analysis are similar. attached Figure 31 This is the three-phase input current waveform after harmonic injection of the P-type 12-pulse autotransformer rectifier through the DCM mode flyback converter. At this time, the input current THD is about 8.9%, which meets the requirements of relevant aviation standards. Figure 2-19 , Figure 21-25 12-pulse rectifiers such as other types of harmonic injection, its working principle is the same as Figure ...

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Abstract

The invention provides a 12 pulse rectifier based on harmonic injection of a DCM (Discontinuous Current Mode) converter and a control method thereof. The pulse rectifier comprises a 12 pulse rectifying circuit and a DCM harmonic injection converter. Based on the traditional 12 pulse circuit, two balance reactors are respectively provided with a winding; unlike ends of the two additional windings are connected; and two dotted ends are used as the input of an AC-DC converter working in a DCM. The output of the AC-DC converter is connected with the output end of the 12 pulse rectifying circuit to return energy to a main circuit; the AC-DC converter working in a DCM of which the input current can automatically track the input voltage can automatically simulate a loss-free resistor to achieve harmonic injection. The AC-DC converter can be a Buck type, a Boost type, a Buck / Boost type, a Cukor type, a Zeta type, an SEPIC (Single-ended Primary Industry Converter) type, a normal shock type, a fly-back type and the like. According to the invention, no complex current control is required by the harmonic-wave injection converter to ensure the formation of harmonic current, and only by regulating the duty ratio and changing the magnitude of the artificial resistance through detecting the load current, the optimal harmonic injection can be realized to reduce the THD (Total Harmonic Distortion) of the grid-side current.

Description

technical field [0001] The invention relates to a 12-pulse rectifier based on DCM converter harmonic injection and a control method thereof for reducing grid-side current harmonics, and belongs to the field of electric energy conversion. Background technique [0002] The diode bridge rectifier circuit can convert alternating current to direct current. When the direct current side is filtered by a capacitor, the harmonic component of the input side current is very large, which causes serious pollution to the power grid. The traditional 12-pulse rectifier contains two sets of 6-pulse rectification circuits, which can eliminate the 5th and 7th harmonic components in the input current. It has high system reliability, low equipment cost, simple structure, and high efficiency. It is widely used in aviation, industry, etc. and other occasions. With the birth of new harmonic standards at home and abroad, such as the civil aviation airworthiness standard RTCA DO-160E and the nationa...

Claims

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Application Information

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IPC IPC(8): H02M7/04H02M1/12
Inventor 陈乾宏蒋磊磊毛浪
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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