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Method for optimizing zero crossing point distortion of current input Vienna rectifiers

A zero-crossing point distortion and input current technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve the problems of input current distortion, phase difference and amplitude difference, and achieve higher Efficiency and high accuracy

Active Publication Date: 2019-05-17
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, due to the inductance voltage drop and resistance component 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 distortion of the input current

Method used

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  • Method for optimizing zero crossing point distortion of current input Vienna rectifiers
  • Method for optimizing zero crossing point distortion of current input Vienna rectifiers
  • Method for optimizing zero crossing point distortion of current input Vienna rectifiers

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Embodiment 1

[0067] figure 1 It is the topology diagram of the three-phase three-level Vienna rectifier, in which the L filter is used on the grid side.

[0068] figure 2 It is the overall control structure diagram of the existing inductance online identification in the Vienna rectifier dq rotating coordinate system. Output voltage given U dc * and the measured DC side output voltage difference U dc The given i as the active component q-axis after being adjusted by PI 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 ;Reactive component d axis given i d * (generally set to 0) and the d-axis component i d After the PI regulator, as the reference voltage d-axis component U dref , and then convert the three-phase reference voltage U through the dq / abc coordinate system aref , U bref , U cref . The three-phase reference voltage is combined with the on-line identification of the inductance ...

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Abstract

The invention discloses a method for optimizing zero crossing point distortion of input current of Vienna rectifiers. The method comprises the steps of: obtaining an AC voltage amount input by a network-side rectifier through sampling DC-side voltage and a state of a switch tube; carrying out sampling to obtain voltage input by a power grid and carrying out phase-locked loop calculation to obtaina voltage phase difference; carrying out transformation on the obtained AC voltage amount and the voltage phase difference to obtain values under a dq coordinate; sampling current input by a three-phase power grid, carrying out Clark transformation to obtain a current component under an alpha beta coordinate system, and carrying out modulo operation to obtain a module of a current vector; respectively filtering the AC voltage amount and the current vector module through LPF, and outputting an identified inductance value via a divider; substituting the identified inductance value into the calculation of a distortion angle so as to obtain three-phase compensation voltage, and optimizing distortion current. The method is capable of improving the precision of calculation distortion angles of current input by Vienna rectifiers, enabling the input current to be same as reference voltage, and improving the efficiency of the Vienna rectifiers.

Description

technical field [0001] The invention relates to the technical field of rectifier converters, in particular to a method for optimizing the distortion at the zero-crossing point of an input current of a Vienna rectifier. Background technique [0002] With the continuous development of industrial technology, power electronic conversion devices have been widely used. In order to meet the strict requirements of the power grid and electrical equipment for harmonic standards, a three-phase pulse width modulation (PWM) rectifier with low input current total harmonic distortion (THD) and high power factor is studied to improve the electrical energy. A hot spot in terms of quality. Three-phase three-level rectifiers are increasingly used in high-voltage and large-capacity applications such as high-voltage direct current transmission, wind power generation, uninterruptible power supply, and communication power supply. Among them, Vienna three-level rectifiers have attracted much atte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219
Inventor 吕建国丁慧敏胡文斌范林勇王亚呈
Owner NANJING UNIV OF SCI & TECH
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