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Direct-current half-voltage reduction four-quadrant rectifier

A four-quadrant rectifier, AC power supply technology, applied in the direction of converting AC power input to DC power output, AC network circuit, output power conversion device, etc., can solve problems such as only working at high DC voltage and limited application range

Active Publication Date: 2021-05-18
张超 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as we all know, there is an obvious shortcoming in the voltage source bridge FQR structure, that is, in order to ensure its normal operation, especially in order to ensure the transient controllability of the current waveform on the AC side, the DC side voltage must be raised high enough , this feature is derived from the boost topology of the voltage-type bridge FQR, which limits its application range to a certain extent and can only work in a high DC voltage state

Method used

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  • Direct-current half-voltage reduction four-quadrant rectifier
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  • Direct-current half-voltage reduction four-quadrant rectifier

Examples

Experimental program
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Effect test

Embodiment 1

[0036] If the AC side input power of each FQR unit is selected k (k=1, 2, 3) are all power frequency 50Hz, effective value 220V power grid sine wave voltage, then for the traditional half-bridge FQR unit, the DC side voltage U d The lower limit of the value range is required to be: U dmin >2E km =622V, in practice, it should be slightly higher than a certain margin. Usually, the recommended margin coefficient is 1.12, which is about 697V; for the traditional three-phase FQR, the lower limit requirement is: Take 1.12 according to the margin coefficient, and the actual value is about 604V. And compare the present invention, no matter DHV type FQR unit or three-phase FQR etc., DC side voltage U d1 The lower limit of the value range is required to be: U d1min >E km = 311V, in practice, it should be slightly higher than a certain margin. According to the commonly recommended margin coefficient of 1.12, it is about 348V, which is nearly half lower than the traditional FQR stru...

Embodiment 2

[0038] The implementation case of DHV type FQR applied to grid-connected inverter of photovoltaic power generation The system structure is as follows Figure 4 shown. Since the DHV-FQR DC side voltage requirement is much lower than that of the traditional bridge FQR, when implementing photovoltaic power generation inversion, there is no need for step-up DC / DC conversion, and the lower voltage photovoltaic cell array can be directly connected to the DHV -FQR DC side. Its control method can still adopt a typical double closed-loop control system that is basically consistent with the traditional bridge FQR. Figure 4 .

[0039] Assume that the grid-connected voltage on the AC side is a three-phase line voltage of 380V (or a single-phase voltage of 220V), and consider the actual DC side voltage U according to Embodiment 1. d1 The lower limit of the value range should be higher than a certain margin, U d1min The recommended value is 348V.

[0040] The monocrystalline silicon p...

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Abstract

The invention belongs to the technical field of power electronic conversion and new energy power generation, and particularly relates to a direct-current half-voltage-reduction four-quadrant rectifier (DHV-FQR). The novel circuit structure of the rectifier aims to overcome the obvious defect of a traditional voltage source bridge type FQR, namely in order to guarantee the normal work of the traditional voltage source bridge type FQR, especially in order to achieve the excellent control performance on alternating current side transient current waveforms, direct current side voltage must be increased to be high enough, consequently the application range of the traditional voltage source bridge type FQR is limited. The present invention provides the direct current side half-voltage reduction type four-quadrant rectifier which comprises a power supply input circuit unit, a cross H-bridge circuit unit and an output load unit, the direct current side working voltage of the rectifier can be reduced by approximately half compared with that of a traditional structure, and the rectifier is suitable for power electronic conversion application occasions with lower requirements for direct current side rated working voltage.

Description

technical field [0001] The invention relates to a novel DC half-voltage four-quadrant rectifier, which belongs to the technical field of power electronic conversion and new energy power generation. Background technique [0002] Voltage source type four-quadrant PWM rectifier (FQR, Four-Quadrant Rectifier), because the phase between the AC side current and the AC voltage can be set arbitrarily in the four quadrants of 0°~±180°, and its current waveform can also be passed Transient current tracking is used for flexible control, so the four-quadrant PWM rectifier has four performance advantages, mainly including: [0003] 1) The AC side current can be tracked and controlled according to the set waveform, especially in the case of commonly used sine waves, without harmonic pollution to the power grid; [0004] 2) The AC side can present inductive, capacitive or power factor equal to 1 through current control; [0005] 3) The energy on the AC-DC side can be transmitted bidirect...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M7/797H02J3/38
CPCH02M7/219H02M7/797H02J3/381H02J2300/26Y02E10/56
Inventor 张超张加胜
Owner 张超