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Three-phase four-bridge-arm inverter random pulse position 3D-SVPWM control system and method thereof

A 3D-SVPWM, three-phase four-leg technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., to improve harmonic problems, reduce noise, and reduce electromagnetic interference Effect

Inactive Publication Date: 2018-11-13
SUZHOU INST OF INDAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the present invention provides a three-phase four-arm inverter random pulse position 3D-SVPWM control system and its method, to improve the harmonic problem caused by the 3D-SVPWM modulation strategy, will focus on Harmonic amplitudes at integer multiples of the switching frequency are evenly distributed throughout the frequency domain, which can reduce adverse effects such as noise caused by harmonics at lower switching frequencies

Method used

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  • Three-phase four-bridge-arm inverter random pulse position 3D-SVPWM control system and method thereof

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Embodiment 1

[0046] Such as figure 1 Shown is a schematic diagram of the topological structure of a three-phase four-leg inverter. The topology is a traditional three-phase three-leg inverter with a fourth-phase bridge arm, and the midpoint of the bridge arm is connected to the output load Therefore, the neutral point current must flow into the load. This topology has higher redundancy, its output voltage is more independent, and it can fully realize the decoupling control of the output phase voltage. Even if the inverter output is connected to a three-phase asymmetric, non-linear load, the topology can Get symmetrical three-phase output. In the figure, each bridge arm is composed of two IGBTs and corresponding freewheeling diodes. The PWM switching signal S 1 And S 2 , S 3 And S 4 , S 5 And S 6 , S 7 And S 8 All are complementary symmetrical output, U dc Is the DC bus voltage, L n Is the neutral inductance.

[0047] Specific as figure 2 As shown, the present invention discloses a three-...

Embodiment 2

[0054] The invention additionally discloses a random pulse position 3D-SVPWM control method for a three-phase four-arm inverter, which includes the following steps:

[0055] Step 1: Construct a 3D-SVPWM method control system for random pulse position of three-phase four-leg inverter;

[0056] The control system includes a three-phase four-leg inverter, a random number generator, a vector action time module, a switch action time module, a three-phase sine wave generator, and a 3D-SVPWM generator. The three-phase sine wave generator first generates a three-phase sine wave and transmits it to the 3D-SVPWM generator by a wire. The vector action time module calculates the action time of the working voltage vector according to the random number generated by the random number generator, and the switching action time module calculates The action time of the upper and lower switching tubes of the three-phase four-leg inverter is transmitted to the 3D-SVPWM generator. The 3D-SVPWM generator ...

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Abstract

The invention discloses a three-phase four-bridge-arm inverter random pulse position 3D-SVPWM control system and a method thereof, and belongs to the technical field of power electronics. The controlsystem uses a three-phase sine wave generator to generate three-phase sine waves to be transmitted to a 3D-SVPWM generator; a vector action time module calculates the action time of a working voltagevector according to the random number generated by a random number generator; a switch action time module calculates the action time of an upper switch tube and a lower switch tube of the three-phasefour-bridge arm inverter according to the obtained action time and transmits the action time to the 3D-SVPWM generator; and the 3D-SVPWM generator is used for generating a PWM control signal according to the received three-phase sine waves, the vector action time and the set switching period, and conducts the signal to an IGTB switch tube of the three-phase four-bridge-arm inverter topological structure through a wire. According to the method disclosed by the invention, under the condition that THD is not increased, the high-order harmonic waves at the switching frequency are dispersed withina certain range, so that the electromagnetic interference of the system is lowered.

Description

Technical field [0001] The invention belongs to the technical field of power electronics, and particularly relates to a random pulse position 3D-SVPWM control system and method for a three-phase four-arm inverter. Background technique [0002] With the rapid development of power electronics technology, the application of various non-linear loads is becoming more and more common. Usually, UPS or inverters are required to have the ability to supply power to unbalanced and non-linear loads. At this time, the traditional three-phase three-leg inverse The converter seems powerless. The three-phase four-leg inverter topology is an inverter topology that has been widely studied in recent years. It can directly control the neutral current and has the advantages of flexible control and no need for large DC link capacitors. [0003] Many scholars at home and abroad have studied the modulation strategy of three-phase four-leg inverters. The three-dimensional space vector pulse width modulati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387
CPCH02M7/53875H02M7/53876
Inventor 张宇峰马俊刘慧
Owner SUZHOU INST OF INDAL TECH
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