Control method of three-phase PWM (pulse width modulation) rectification based on novel model prediction control

Abstract

The invention discloses a control method of a three-phase PWM (pulse width modulation) rectification based on novel model prediction control. The control method mainly consists of an outer voltage loop and a model prediction control step, wherein the outer voltage loop is a PI link, and the model prediction control is an inner current loop control. According to key points of the control method of the three-phase PWM rectifier, the algorithm is simplified on the basis of traditional finite set model prediction control, the switch actuation times is reduced, the switch frequency is reduced, the switch actions at two adjacent sampling moments are mutually associated to each other, a feedback characteristic is realized, and the switch action is not random and irregular. According to the control method of the three-phase PWM rectifier, the advantages of the finite model prediction control are maintained, the advantages such as rapidness in control algorithm and low switch loss can be achieved.

Description

technical field [0001] The invention relates to a three-phase voltage-type PWM rectification technology, in particular to a control method for a three-phase PWM rectification based on a novel model predictive control, and belongs to the technical field of power electronic conversion. Background technique [0002] With the development of the economy, the demand for high-power DC power supply is increasing year by year. The traditional uncontrolled and phase-controlled high-power power supply has large input current harmonics, low power factor has a great impact on the power grid, and the slow current response cannot meet the needs of production and life. ; and the three-phase voltage PWM rectifier can eliminate the input current harmonics from the source, and has a unit power factor, so it is the current focus of attention in the field of power electronics. [0003] At present, the common control strategies are: hysteresis comparison control, model predictive control, current...

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Problems solved by technology

[0002] With the development of the economy, the demand for high-power DC power supply is increasing year by year. The traditional uncontrolled and phase-controlled high-power power supply has large input current harmonics, low power factor has a great impact on the power grid, and the slow current response cannot meet the needs of production and life. ; and the three-phase voltage PWM rectifier can eliminate the input current harmonics from the source, and has a unit power factor, so it is the focus of the current power electronics field

[0003] At present, the common control strategies are: hysteresis comparison control, model predictive control, current prediction control, feedforward decoupling control, but these controls still have shortcomings: simple hysteresis comparison control input current ripple is still relatively large; However, feedforward decoupling control and current predictive control need to add SVPWM or SPWM links, and the algorithm is complex; although the traditional finite set model predictive control has a relatively fast dynamic response, the large amount of online calculation of the algorithm causes delay to affect the control effect. The switching frequency can have a better control effect, and the switching loss is large

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