An enhanced finite control set model predictive control method with self-balancing capacitor voltages for three-level T-type rectifiers


Bayhan S., Kömürcügil H., Güler N.

Iet Power Electronics, no. , pp.1-11, 2022 (Peer-Reviewed Journal)

  • Publication Type: Article / Article
  • Publication Date: 2022
  • Doi Number: 10.1049/pel2.12245
  • Journal Name: Iet Power Electronics
  • Journal Indexes: Science Citation Index Expanded, Scopus, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.1-11

Abstract

An effective finite control set model predictive control (FCS-MPC) is introduced for single-phase three-level T-type rectifiers supplying resistive as well as constant power loads (CPL).The main problem of CPL is the negative resistance phenomenon that endangers the recti-fier’s stability. Hence, the proposed FCS-MPC method is based on Lyapunov’s stability the-ory such that the stability of the rectifier is guaranteed under all operating points. Unlike theexisting FCS-MPC methods, the cost function design in the proposed control method isformulated on the rectifier’s stability. According to Lyapunov’s stability theory, the rectifierstays stable provided that the rate of change of Lyapunov function is negative. In this case,the derivative of the Lyapunov function can be used as the cost function without utilizingany weighting factor. Therefore, contrary to the existing FCS-MPC methods, the weightingfactor requirement is eliminated which leads to easiness in the design and implementationof the controller. Experimental results reveal that the proposed control approach exhibitsvery good performance with undistorted and distorted grid voltage conditions when therectifier feeds resistive and CPL loads