Publication: Stability and performance investigations of model predictive controlled active-front-end (AFE) rectifiers for energy storage systems
Date
2015
Authors
Akter M.P.
Mekhilef S.
Tan N.M.L.
Akagi H.
Journal Title
Journal ISSN
Volume Title
Publisher
Korean Institute of Power Electronics
Abstract
This paper investigates the stability and performance of model predictive controlled active-front-end (AFE) rectifiers for energy storage systems, which has been increasingly applied in power distribution sectors and in renewable energy sources to ensure an uninterruptable power supply. The model predictive control (MPC) algorithm utilizes the discrete behavior of power converters to determine appropriate switching states by defining a cost function. The stability of the MPC algorithm is analyzed with the discrete z-domain response and the nonlinear simulation model. The results confirms that the control method of the active-front-end (AFE) rectifier is stable, and that is operates with an infinite gain margin and a very fast dynamic response. Moreover, the performance of the MPC controlled AFE rectifier is verified with a 3.0 kW experimental system. This shows that the MPC controlled AFE rectifier operates with a unity power factor, an acceptable THD (4.0 %) level for the input current and a very low DC voltage ripple. Finally, an efficiency comparison is performed between the MPC and the VOC-based PWM controllers for AFE rectifiers. This comparison demonstrates the effectiveness of the MPC controller. � 2015 KIPE.
Description
Controllers; Cost functions; Dynamic response; Electric power distribution; Electric power factor; Electric rectifiers; Energy storage; Model predictive control; Predictive control systems; Renewable energy resources; Stability; System stability; Ac-dc power conversion; Active front ends; Efficiency comparisons; Energy storage systems; Fast dynamic response; Nonlinear simulations; Renewable energy source; Stability analysis; Rectifying circuits