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Novel triangular wave comparison control method for three-phase PWM rectifier

A comparative control and triangular wave technology, which is applied in the field of new triangular wave comparative control of three-phase PWM rectifiers, can solve problems such as complex algorithms and large current ripples, and achieve the effect of simple algorithms, small ripples, and low ripples

Inactive Publication Date: 2015-08-26
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0003] Common control strategies currently include: hysteresis comparison control, feedforward decoupling control, and current prediction control, but these controls still have shortcomings: the input current ripple of simple hysteresis comparison control is still relatively large; Coupling control and current predictive control need to add SVPWM or SPWM links, and the algorithm is complex

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  • Novel triangular wave comparison control method for three-phase PWM rectifier
  • Novel triangular wave comparison control method for three-phase PWM rectifier
  • Novel triangular wave comparison control method for three-phase PWM rectifier

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Embodiment Construction

[0021] The implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto.

[0022] Such as Figure 1a ~ Figure 1c As shown, a schematic diagram of a new triangular wave comparison control system and method for a three-phase PWM rectifier of the present invention, the main steps are as follows: (S1) use the phase-locked circuit to obtain the zero-crossing point of the a-phase grid ea, and DSP according to the phase-a grid ea The grid cycle is calculated in real time at the zero crossing point, and the control cycle is changed accordingly. At the same time, the three-phase input grid voltage values ​​(ea, eb, ec) are calculated according to the zero crossing point of the a-phase grid ea, and converted into digital signals; (S2) use the current The Hall sensor respectively samples the input current value (ia, ib, ic) of the ...

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Abstract

The invention discloses a tovel triangular wave comparison control method for a three-phase PWM rectifier, and belongs to the power electronic converting technology and intelligent control field; the control method mainly comprises a voltage outer ring, a feedforward decoupling, and triangular wave comparison control; the voltage outer ring is a PI node, and the feedforward decoupling is current inner ring control. The control method is simple, uses advantages of the triangular wave comparison control and the feedforward decoupling, and can realize constant frequency control and AC side input current low resonance when an input power factor is 1 and a switch frequency is low.

Description

technical field [0001] The invention relates to the technical field of three-phase rectification, in particular to a novel triangular wave comparison control method for a three-phase PWM rectifier. Background technique [0002] With the development of industry, the demand for high-power power supply is gradually increasing. The traditional high-power power supply has large input current harmonics, and the low power factor has a great impact on the power grid; while the three-phase PWM rectifier can eliminate the input current harmonics from the source, and It has a unit power factor, so it has attracted much attention in the field of power electronics. [0003] Common control strategies currently include: hysteresis comparison control, feedforward decoupling control, and current predictive control, but these controls still have shortcomings: the input current ripple of simple hysteresis comparison control is still large; Coupling control and current predictive control need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219
Inventor 杜贵平朱天生柳志飞
Owner SOUTH CHINA UNIV OF TECH
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