Double closed-loop control of VIENNA rectifier with neutral point potential balance control

A double closed-loop control, potential balance technology, applied in electrical components, output power conversion devices, AC power input into DC power output and other directions, can solve the problem of complex calculation of SVPWM, and achieve excellent grid-side performance and reliability. High, low switching stress effect

Inactive Publication Date: 2018-01-30
郭琳
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AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem of complex SVPWM and large amount of calculation when controlling the VIENNA rectifier with double closed-loop control, the present invention proposes a double-closed-loop control of VIENNA rectifier with neutral point potential balance control

Method used

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  • Double closed-loop control of VIENNA rectifier with neutral point potential balance control
  • Double closed-loop control of VIENNA rectifier with neutral point potential balance control
  • Double closed-loop control of VIENNA rectifier with neutral point potential balance control

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Embodiment Construction

[0017] specific implementation plan

[0018] figure 1 Among them, the three-phase uncontrolled rectifier bridge and three bidirectional switches connected to the input point of the rectifier and the midpoint of the DC bus capacitor are composed of three bidirectional switches, Sa, Sb, Sc represent the state of the three switches, 0 is open, 1 is closed,, The maximum voltage that each switching tube bears is half of the output bus voltage, so low withstand voltage devices can be used for high power applications. Depend on figure 1 Get VIENNA AC side voltage balance equation:

[0019]

[0020] is the grid voltage; is the boost inductor; is the inductor current; is the voltage from the neutral point of the capacitor to the neutral point of the grid; Enter the phase voltage for the rectifier.

[0021] Taking phase a as an example, when the switch Sa is turned on, the input terminal of phase a rectifier is clamped at the midpoint O of the DC side; when the switch Sa i...

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Abstract

The present invention discloses a double closed-loop control of a VIENNA rectifier with neutral point potential balance control. A VIENNA rectifier is high in power factor, low in input current THD, few in switching devices and low in switching stress and has no switching dead zone, is high in reliability, and is especially suitable for medium and high power occasions of energy one-way flow. The double closed-loop control of a VIENNA rectifier with neutral point potential balance control can realize neutral point voltage balance control at a direct current side through regulation of a direct current offset, and a three-level SVPWM algorithm based on a two-level space vector plane is provided by the invention, so that neutral point voltage balance control is realized while a rectifier system has a good input performance and a direct current voltage stabilization performance.

Description

Technical field [0001] The invention relates to a VIENNA rectifier, in particular to a double closed-loop control of the VIENNA rectifier with neutral point potential balance control. Background technique [0002] The VIENNA rectifier is a two-quadrant mid-point clamped three-level PWM rectifier topology. VIENNA rectifier has the advantages of high power factor, low input current THD, less switching devices, low switching stress, no switching dead zone problem, high reliability, etc. It is especially suitable for medium and high power occasions where energy flows in one direction. The converter control is the core , research on the rectifier control problem has important theoretical significance and engineering value. [0003] The input phase voltage of the VIENNA rectifier is three-level. Like the traditional three-level rectifier topology, there is a midpoint fluctuation problem. The midpoint potential fluctuation will bring even harmonics, which will increase the voltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219
Inventor 郭琳
Owner 郭琳
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