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Method for optimizing input current of Vienna rectifier

A technology of input current and rectifier, applied in the direction of converting AC power input to DC power output, output power conversion device, electrical components, etc., can solve problems such as input current distortion, phase difference and amplitude difference, and improve power factor , reduce the switching frequency, reduce the effect of distortion

Active Publication Date: 2017-08-18
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, due to the presence of inductance voltage drop and resistance components in the filter, there is a certain phase difference and amplitude difference between the grid side current and the three-phase reference voltage of the rectifier, resulting in input current distortion

Method used

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  • Method for optimizing input current of Vienna rectifier
  • Method for optimizing input current of Vienna rectifier
  • Method for optimizing input current of Vienna rectifier

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Embodiment 1

[0046] Such as figure 1 as shown, figure 1 It is a topological structure diagram of a three-phase three-level Vienna rectifier, in which an LCL filter is used on the grid side.

[0047] Such as figure 2 as shown, figure 2 It is the overall control structure diagram of the Vienna rectifier dq rotating coordinate system. Output voltage given U dc * and the measured DC side output voltage difference U dc After PI adjustment, it is used as the given i of the active component q axis q * , and then with the q-axis component i of the input current q Through the PI regulator as the reference voltage q-axis component U qref ;Given i of reactive component d-axis d *(Generally the value is 0) and the d-axis component i d Through the PI regulator as the reference voltage d-axis component U dref , and then convert the dq / abc coordinate system to obtain the three-phase reference voltage U aref , U bref , U cref . The three-phase reference voltage plus the compensation vol...

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PUM

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Abstract

The invention discloses a method for optimizing the input current of a Vienna rectifier, belonging to the field of high power factor conversion devices. The method comprises the following steps of adopting a switching frequency optimization PWM method to establish three-phase reference voltage and generating basic modulation wave, calculating a voltage phase angle generated due to the existence of a filter and determining the scope of compensation, adding compensation voltage to the three-phase reference voltage, generating new modulation wave, allowing the new modulation wave and triangle wave double-carrier wave with same upper and lower amplitudes and phase to be in intersection, and finally obtaining PWM wave which controls the Vienna rectifier. According to the method, the current distortion caused by an LCL filter device can be reduced, thus the input current tracks input voltage, a power factor is improved, and the efficiency of the Vienna rectifier is improved.

Description

technical field [0001] The invention relates to the technical field of high power factor conversion devices, in particular to a method for optimizing the input current of a Vienna rectifier. Background technique [0002] With the continuous development of industrial technology, the wide application of power electronic conversion devices has brought great convenience to power conversion. The power quality of the grid side is improved. Among them, the rectifier is essential. Therefore, in the field of power electronics research today, the PWM rectifier should meet the characteristics of high power factor and low input current harmonic distortion (total harmonic distortion, THD), which is also a current research hotspot. [0003] VIENNA rectifier is a three-level PWM rectifier topology proposed by Professor Kolar in 1994, which has the characteristics of high efficiency compared with other types of converters. This topology is simple, with fewer switching devices; the maximu...

Claims

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Application Information

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IPC IPC(8): H02M1/42H02M7/219
CPCH02M1/4233H02M7/219Y02B70/10Y02P80/10
Inventor 胡文斌俞爱娟吕建国李冬莹李响
Owner NANJING UNIV OF SCI & TECH
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