Abstract
In this paper, a single-phase five-level rectifier with coupled inductors is studied. First, a discrete mathematical model of a single-phase five-level rectifier is created in two-phase(αβ). A traditional single vector finite control set model predictive control (FCS-MPC) algorithm is improved to overcome the problems of a varying switching frequency, the large amount of time needed for calculation, and the inaccurate setpoint of current loop tracking. Then, the objective function of the system is established, and a simple objective function is used instead of an iterative optimization of the traditional FCS-MPC algorithm. At the same time, to eliminate the delay error and to reduce harmonic distortion, deadbeat control technology is introduced. Finally, the simulation and experimental results show that the improved model predictive current control algorithm not only retains the fast response of traditional model predictive control, but also has the advantages of fixed switching frequency, small calculation time, and small current steady-state error.
Highlights
With the rapid development of power electronics technology, single-phase pulse width modulation (PWM) converters have become more common
Multilevel rectifiers have been widely used in high voltage direct current (HVDC) transmission systems, power electronics transformers (PET), and electric locomotive traction
This paper studies a single-phase five-level rectifier with coupled inductors
Summary
With the rapid development of power electronics technology, single-phase pulse width modulation (PWM) converters have become more common. References [21,22] proposed a control method based on the two-vector optimal duty cycle and added deadbeat control technology, which effectively fixed the switching frequency and reduced the harmonic distortion rate of the grid-side current. To improve the overall performance of this rectifier, fix the switching frequency, reduce a large number of calculations in the online optimization process of the traditional single vector FCS-MPC algorithm, and retain the fast response characteristics of the traditional FCS-MPC, the traditional model predictive control algorithm is improved. The proposed algorithm adds deadbeat control technology and space vector technology, this method greatly simplifies the modulation function of the rectifier It achieves the purposes of precise control, small calculation amount, and fixed switching frequency. The improved MPCC algorithm is compared with a traditional single-vector FCS-MPC algorithm and proportional integral (PI) current decoupling control
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