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Control circuit of three-phase Vienna rectifier under unbalanced neutral point potential and discontinuous pulse width modulation method

A pulse width modulation and control circuit technology, applied in electric vehicles, electrical components, output power conversion devices, etc., can solve problems such as inapplicability of Vienna rectifiers, achieve high power density, wide application prospects, and eliminate input current distortion. Effect

Active Publication Date: 2021-03-12
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the modulation wave in this modulation scheme has an interval opposite to the polarity of the alternating current, it is not suitable for Vienna rectifiers

Method used

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  • Control circuit of three-phase Vienna rectifier under unbalanced neutral point potential and discontinuous pulse width modulation method
  • Control circuit of three-phase Vienna rectifier under unbalanced neutral point potential and discontinuous pulse width modulation method
  • Control circuit of three-phase Vienna rectifier under unbalanced neutral point potential and discontinuous pulse width modulation method

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Embodiment Construction

[0021] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] Such as figure 1 Shown is an existing three-phase Vienna rectifier 10 and a control circuit 20 designed by the present invention.

[0023] Such as figure 1 As shown, the three-phase Vienna rectifier 10 includes a three-phase AC power supply 101 (u sa , u sb , u sc ); Three-phase input filter inductor 102 (L a , L b , L c ); the first to sixth power diodes 103 (D 1 ~D 6 ); the first to sixth power switch tubes 104 (S 1 ~S 6 ); the first DC bus filter capacitor and the second DC bus filter capacitor 105 (C dc1 、C dc2 ). The six power diodes are connected in pairs to form a three-phase bridge arm, the six power switch tubes are connected in pairs to form a three-phase bridge arm, and the first DC bus filter capacitor and the second DC bus filter capacitor are respectively connected to Both ends of the midpoint of the DC si...

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Abstract

The invention discloses a control circuit of a three-phase Vienna rectifier under unbalanced midpoint potential and a discontinuous pulse width modulation method. The control circuit comprises a powergrid voltage sampling circuit, an inductive current sampling circuit, a bus voltage sampling circuit, a switching tube driving circuit and a DSP control unit. The DSP control unit comprises a first abc / dq converter, a second abc / dq converter, a phase lock, a dq / alpha beta converter, a DPWM controller, a bus voltage PI regulator, an active current PI regulator and a reactive current PI regulator.According to the discontinuous pulse width modulation method, a space vector diagram and a small sector division mode are corrected in real time according to the midpoint potential. According to the invention, the Vienna rectifier can operate with high efficiency and low THD when the neutral point potential is unbalanced.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters, and in particular relates to a control circuit and a method for a three-phase Vienna rectifier at an unbalanced neutral point. Background technique [0002] The three-phase Vienna rectifier is widely used in aviation power supply, electric vehicle charging and other fields due to its advantages of high reliability, high efficiency and low current harmonic distortion. As a three-level converter, the midpoint potential imbalance is an inherent problem. The unbalanced midpoint potential will cause input current distortion and affect power quality. Prior art literature "W.Ding, C.Zhang, F.Gao, B.Duan, and H.Qiu, A Zero-Sequence Component Injection Modulation Method With Compensation for Current Harmonic Mitigation of a Vienna Rectifier, IEEETransactions on Power Electronics, vol .34, no.1, pp.801-814, Jan.2019." and "W.Ding, H.Qiu, B.Duan, X.Xing, N.Cui, and C.Zhang, A Novel Seg...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M1/088
CPCH02M7/219H02M1/088Y02T10/7072
Inventor 张犁邹宇航郑仲舒
Owner HOHAI UNIV
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