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The vector soft start method of pwm rectifier

A rectifier and soft start technology, applied in the direction of output power conversion device, irreversible AC power input conversion to DC power output, electrical components, etc., to achieve smooth switching, enhance stability and reliability, and avoid excessive inrush current Effect

Active Publication Date: 2019-03-26
XIAN UNIV OF TECH
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Problems solved by technology

[0008] The purpose of the present invention is to provide a vector-type soft-start method for a PWM rectifier, which solves the problem of overshoot current caused by a sudden change in the amplitude or phase of the current vector when the PWM rectifier is switched from an uncontrolled rectification operation mode to a PWM rectification operation mode in the prior art. The problem

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  • The vector soft start method of pwm rectifier

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[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] The inventors have found that when the PWM rectifier is switched from the uncontrolled rectification mode to the PWM rectification mode, the sudden change in the amplitude or phase of the current vector will cause an overshoot current in the PWM rectifier. Therefore, when switching the mode of operation, it should be Design a new vector-type instruction smooth transition algorithm to avoid overshoot current. In order to solve the current impact problem caused by the sudden change of the state of the vector current command when the PWM rectifier is switched from the non-controlled rectification mode to the PWM rectification mode, the present invention proposes a smooth transition soft start method for the vector current command of the PWM rectifier .

[0028] refer to figure 1 , the PWM rectifier vector current command smooth transiti...

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Abstract

The invention discloses a vector type soft-start method of a PWM rectifier. The method is based on a PWM rectifier vector type current instruction smooth transition soft-start structure, and comprises the following steps: step 1), controlling according to an uncontrolled rectifying working mode at the uncontrolled rectifying stage; step 2) performing smooth transition soft-start and switching to a PWM rectifying working mode from the uncontrolled rectifying working mode; step 3) adding a voltage outer ring to realize the vector type soft-start. By using the method disclosed by the invention, when the PWM rectifier is switched to the PWM rectifying working mode from the uncontrolled rectifying working mode, the smooth transition of the current vector is realized by using the vector type soft-start technology, the situation that excessive impact current occurs or the start is failed in the start of the PWM rectifier by using the traditional method is effectively avoided, the smooth switching of the device is realized, and the stability and the reliability are enhanced.

Description

technical field [0001] The invention belongs to the technical field of power electronic control, and relates to a vector type soft start method of a PWM rectifier. Background technique [0002] PWM rectification technology can realize unit power factor (that is, power factor is 1) operation, bidirectional flow of energy, and can obtain better current quality and realize "green power conversion". With the maturity of PWM rectification technology, its application fields are also expanding, such as static var compensator, new energy grid-connected power generation, etc. [0003] Although the PWM rectifier has many of the above advantages, a large overshoot current will be generated at the moment of starting the PWM rectifier, which will increase the current stress on the power device, which will have a negative impact on device selection and system reliability. Therefore, continuous improvement of the soft-start method for the PWM rectifier is of great significance to solve th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M7/40
CPCH02M1/36H02M7/40
Inventor 李洁郭亚南李浩任海鹏
Owner XIAN UNIV OF TECH