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Method for optimizing input current of VIENNA rectifier under wide-range unbalanced power grid

An input current, rectifier technology, applied in the irreversible AC power input into DC power output, AC power input into DC power output, output power conversion device and other directions, can solve the rectifier grid side current distortion, the system can not work and other problems, to achieve the effect of reducing harmonic distortion rate, reliable operation, and low hardware cost

Pending Publication Date: 2022-02-25
NANJING UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

The phase difference between the grid-side voltage and current will cause distortion of the grid-side current of the rectifier, and in severe cases, it may even cause the system to fail to work

Method used

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  • Method for optimizing input current of VIENNA rectifier under wide-range unbalanced power grid
  • Method for optimizing input current of VIENNA rectifier under wide-range unbalanced power grid
  • Method for optimizing input current of VIENNA rectifier under wide-range unbalanced power grid

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Embodiment 1

[0159] In this embodiment, a three-phase VIENNA rectifier circuit is built by using the Simulink tool in MATLAB, and the input voltage is rectified by the three-phase VIENNA rectifier circuit to obtain direct current. The electrical parameter settings in the simulation process are shown in Table 3:

[0160] table 3

[0161]

[0162] This simulation selects two grid conditions:

[0163] (1) Set the initial phase of phase a grid to 0; the voltage of phase b grid increases by 20% compared to phase a, and the phase lags by 120°, that is, the initial phase of phase b grid voltage is -120°; phase c grid voltage Compared with phase a, the amplitude of the voltage is increased by 40%, and the phase is 120° ahead, that is, the initial phase of the grid voltage of phase c is 120°;

[0164] (2) Set the initial phase of phase a grid to 0; the voltage of phase b grid increases by 10% compared to phase a, and the phase lags by 100°, that is, the initial phase of phase b grid voltage is...

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Abstract

The invention discloses a method for optimizing input current of a VIENNA rectifier under a wide-range unbalanced power grid, and belongs to the field of power electronic conversion devices. The method comprises the following steps that: a static working range of the VIENNA rectifier is analyzed, so that input current distortion in the static working range can be suppressed through a modulation wave interval clamping method; a negative sequence current control coefficient k is introduced outside the static working range on the basis of three current control targets during power grid unbalance, k is defined in a continuous interval, reference voltage is restrained in the static working range by adjusting the value of k, and input current distortion is suppressed by using the modulation wave interval clamping; and finally, sine pulse width modulation (SPWM) is performed on generated modulation waves to obtain pulse width modulation waves for controlling the switching on and switching off of the VIENNA rectifier during power grid unbalance. According to the method, the current distortion of the VIENNA rectifier caused by inconsistent phases of the grid-side current and the reference voltage during the power grid unbalancecan be effectively suppressed, the system power factor is improved, the grid-side current harmonic distortion rate is reduced, and meanwhile, the efficiency of the VIENNA rectifier is improved.

Description

technical field [0001] The invention belongs to the technical field of power electronic conversion devices, in particular to a method for optimizing the input current of a VIENNA rectifier under a wide-range unbalanced power grid. Background technique [0002] With the rapid development of semiconductor technology and micro-processing technology, power electronics technology has undergone tremendous changes in the past three decades, and has been more and more widely used in various fields of the national economy, including various high-quality power supplies, flexible Applications such as Flexible AC Transmission System (FACTS), High Voltage Direct Current (High Voltage Direct Current) and aerospace. At the same time, the non-linearity, impact and imbalance of these equipment and systems will cause the voltage waveform and current waveform in the power grid to be distorted, thereby reducing the quality of the input current and greatly reducing the efficiency of the equipmen...

Claims

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Application Information

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IPC IPC(8): H02M7/06H02M7/217H02M1/12
CPCH02M7/06H02M7/217H02M1/12
Inventor 吕建国史兆成李志洲李高宁
Owner NANJING UNIV OF SCI & TECH
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