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Control circuit of three-phase Vienna rectifier and discontinuous pulse width modulation method thereof

A technology for control circuits and rectifiers, applied in electrical components, climate sustainability, high-efficiency power electronic conversion, etc., can solve the problems of increasing switching losses, weakening the ability to adjust the midpoint potential, and achieve low switching losses and converter efficiency. High and wide application prospects

Active Publication Date: 2020-02-28
HOHAI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

But the use of SVPWM will inevitably increase the switching loss, and when the modulation ratio is low, the ability of this method to adjust the midpoint potential will be greatly weakened

Method used

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  • Control circuit of three-phase Vienna rectifier and discontinuous pulse width modulation method thereof
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  • Control circuit of three-phase Vienna rectifier and discontinuous pulse width modulation method thereof

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Embodiment Construction

[0022] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] Such as figure 1 Shown is an existing three-phase Vienna rectifier 10 and a control circuit 20 designed by the present invention.

[0024] 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 inductance 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 side. R in...

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Abstract

The invention discloses a control circuit of a three-phase Vienna rectifier and a discontinuous pulse width modulation method thereof. The control circuit includes a grid voltage sampling circuit, aninductor current sampling circuit, a bus voltage sampling circuit, a switching transistor driving circuit and a DSP control unit. The DSP control unit includes a first abc / dq converter, a second abc / dq converter, a phase locker, dq / [alpha][beta] converter, a DPWM controller, a hysteresis controller, a bus voltage PI regulator, an active current PI regulator and a reactive current PI regulator. Thediscontinuous pulse width modulation method finds out a redundant clamping mode in a vector space that has an opposite effect on a neutral point potential, and adjusts, in combination with the offsetdirection of the neutral point potential, the neutral point potential balance by switching the clamping mode. The control circuit can effectively adjust the neutral point potential balance, and has low switching loss and high converter efficiency.

Description

technical field [0001] The invention belongs to the technical field of power electronic converters, and in particular relates to a control circuit and method of a three-phase Vienna rectifier. 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. In the application of aviation primary power supply, it is often desired that the converter has a higher switching frequency. On the one hand, high switching frequency can reduce the volume and weight of the converter and obtain higher power density; on the other hand, the fundamental frequency of aviation power grid is high, and high switching frequency can help reduce current harmonic distortion and improve power factor. However, high switching frequency will bring higher switching loss and reduce system efficiency. Compared with traditional s...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M1/42
CPCH02M1/4233H02M7/219Y02B70/10
Inventor 张犁赵瑞纪传浩邹宇航明岩雷铮子
Owner HOHAI UNIV
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