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Output voltage dynamic response optimization control applicable to Vienna rectifier

An output voltage, dynamic response technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve problems such as drop, output voltage overshoot, etc.

Active Publication Date: 2017-01-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to realize the dynamic response optimization of the output voltage of the Vienna rectifier, and solve the problem of serious overshoot or drop of the output voltage when the load suddenly jumps
The invention provides a digital control method through load feed-forward compensation to solve the problem of serious overshoot or drop of output voltage when load jumps

Method used

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  • Output voltage dynamic response optimization control applicable to Vienna rectifier
  • Output voltage dynamic response optimization control applicable to Vienna rectifier
  • Output voltage dynamic response optimization control applicable to Vienna rectifier

Examples

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Embodiment 1

[0059] Picture 1-1 It is a block diagram of the control strategy of the present invention. The hardware circuit topology of the Vienna rectifier of the present invention is as Figure 1-2 It is mainly composed of a power supply, six fast recovery diodes, three boost inductors, three bidirectional power switches, two sets of output capacitors and loads, and is also equipped with a DSP digital controller.

[0060] figure 2 Shown are the control strategy block diagram and load jump detection algorithm of the present invention. In this example, the converter switching frequency and the controller sampling frequency are both 250kHz. This example is suitable for the three-phase input voltage balance situation. For the input voltage three-phase unbalanced The situation can be controlled by existing methods.

[0061] The flow of the load jump detection algorithm of the present invention is as follows:

[0062] 1) First, the DSP digital controller samples the three-phase input voltage signa...

Embodiment 2

[0075] The dynamic response optimization control method of the output voltage of the Vienna rectifier of the present invention is as follows:

[0076] The hardware circuit topology of Vienna rectifier is as Picture 1-1 , This example is suitable for the three-phase balance of the input voltage.

[0077] The control process of the present invention adopts DSP digital controller (TMS320F2808) as image 3 Shown:

[0078] 1) Initialize the ADC sampling module and ePWM module of the DSP digital controller, and initialize the output voltage reference value U o * It is the target value of output voltage control, the steady-state output current signal is 0, and the three-phase duty cycle d a = 0, d b = 0, d c =0.

[0079] 2) The DSP digital controller enters the ADC interrupt program, performs ADC sampling, and collects the three-phase input voltage signal u a , U b And u c , Three-phase input current signal i a , I b And i c , Output voltage signal u o , Output current signal I o .

[0080] 3...

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Abstract

The invention relates to output voltage dynamic response optimization control applicable to a Vienna rectifier, mainly comprising the steps of system electrical signal sampling, voltage error signal compensation, load jump judgment, load feed-forward compensation, current error compensation, and PWM drive signal generation. Through output voltage dynamic response optimization control, load feed-forward control is realized, and the dynamic response property of output voltage is optimized. According to the invention, the load current is sampled. When the fluctuation of load current is less than a preset fixed value, feed-forward compensation calculation is not performed, and the output voltage is regulated completely by a traditional voltage loop. When the load jumps, the traditional voltage loop is compensated through load jump judgment and feed-forward compensation calculation. Double-loop control in the traditional control strategy is maintained, and optimization of dynamic response of output voltage is realized effectively.

Description

Technical field [0001] The invention relates to a dynamic response optimization control method for output voltage of a three-phase three-level three-switch (Vienna) rectifier, which belongs to the field of electric energy conversion. Background technique [0002] With the increasingly serious global environmental pollution and increasingly scarce energy sources, electric vehicles, multi-electric aircraft and other fields have developed rapidly, and the demand for high-power charging and electrical equipment has grown rapidly. Three-phase active power factor correction PWM rectifiers are widely used in high-power equipment to reduce the equipment's harmonic pollution to the power grid. Among them, the three-phase three-level three-switch (Vienna) rectifier has the advantages of high efficiency and low harmonic content, and is widely used in various industrial fields. [0003] Vienna rectifier has a variety of control methods, among which the traditional average mode control method ...

Claims

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Application Information

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IPC IPC(8): H02M7/219
CPCH02M7/219
Inventor 任小永陈旭东陈乾宏张之梁童丹
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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