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Method for suppressing current waveform distortion of three-phase VIENNA rectifier

A current waveform and rectifier technology, which is applied in the control field of AC/DC power conversion devices, can solve the problems of increasing power loss, increasing hardware circuits, and complicated control, and achieves the effect of suppressing the negative impact of grid-side current waveforms

Active Publication Date: 2021-01-01
HARBIN ENG UNIV
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Problems solved by technology

This method increases the hardware circuit, the control is more complicated, and additional power loss is added

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  • Method for suppressing current waveform distortion of three-phase VIENNA rectifier
  • Method for suppressing current waveform distortion of three-phase VIENNA rectifier
  • Method for suppressing current waveform distortion of three-phase VIENNA rectifier

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Embodiment Construction

[0029] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0030] The invention provides a control method suitable for a three-phase VIENNA rectifier and suppressing the negative influence of the grid voltage amplitude imbalance on the grid side current waveform. This method is improved on the basis of single-cycle control. The traditional single-cycle control is based on the assumption of a standard and balanced sinusoidal grid voltage. The input current tracks the grid voltage so that the actual input impedance of the rectifier becomes purely resistive. Thereby making the grid side current sinusoidal. However, when the grid voltage amplitude is unbalanced, the traditional single-cycle control will also cause unbalanced three-phase input current, which will have a relatively large negative impact on power quality sensitive equipment. The invention proposes an improved single-cycle control strategy...

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Abstract

The invention discloses a method for suppressing current waveform distortion of a three-phase VIENNA rectifier, which comprises the following steps of: subtracting actual output voltage Vo from givenoutput voltage Vref to obtain Vm through a voltage controller, processing the Vm through a carrier generation circuit to obtain a carrier by taking the Vm as a peak value, multiplying actual currentsILa, ILb and ILc by voltage unbalance coefficients ka, kb and kc respectively, and then multiplying by a sampling resistor Rs; and finally obtaining an absolute value. The modulated wave is compared with the carrier wave to obtain a pulse driving signal for driving the power electronic device. On the basis of obtaining the positive sequence component of the three-phase unbalanced network-side voltage, the unbalance coefficient of the three-phase voltage is solved and used for correcting a modulation signal controlled by a traditional single-cycle device, so that the relation between the positive sequence component of the network-side voltage and network-side current signals is resistive. The purpose of well suppressing the negative influence of the unbalanced power grid voltage amplitude on the grid-side current waveform is achieved.

Description

technical field [0001] The invention relates to a method for suppressing the distortion of the current waveform of a three-phase VIENNA rectifier, which is suitable for controlling the negative influence of the current when the voltage amplitude of the power grid of the three-phase VIENNA rectifier is unbalanced, and belongs to the AC / DC power conversion device in the field of power electronics technology Control Technology. Background technique [0002] As power electronic devices are more widely used, the stability and reliability of switching power converters are becoming more and more important. In the power supply system and electrical equipment, due to the influence of factors such as components, line parameters or load imbalance, the three-phase voltage will appear unbalanced, resulting in current distortion and line loss. Not only that, it will also have adverse effects on other electrical equipment, greatly reducing the power factor of the grid and reducing system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/06H02M7/217H02M1/12
CPCH02M7/06H02M7/217H02M1/12
Inventor 游江周玮王芳瑞张春雷刘刚
Owner HARBIN ENG UNIV
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