A Model Predictive Control Scheme for a Single-Phase Integrated Battery Charger With Active Power Decoupling for EV Application
Deeksha Bhule, R. Sudharshan Kaarthik
Abstract
Integrated battery chargers (IBCs) are one of the best alternatives among the numerous types of onboard electric vehicle (EV) chargers available, considering the size and weight constraints of EVs. In this article, a model predictive control (MPC) scheme for a single-phase IBC is proposed for the first time. The IBC repurposes the motor drive, which consists of a three-phase induction motor and a three-phase inverter, for charging purposes. The proposed MPC scheme is implemented with the objective of minimization of switching frequency using double prediction algorithm, along with maintaining a sinusoidal grid current profile at unity power factor (UPF) during charging mode. Furthermore, the proposed scheme addresses the issue of ripple power at the dc link with twice the grid frequency, which is inherently present in a single-phase IBCs. This ripple component is effectively suppressed by using active power decoupling by reutilizing one of the stator windings of the induction motor along with the inverter legs without any additional hardware requirement. Additionally, the power reversal capability of IBC is also demonstrated. The control scheme was implemented on hardware by using Texas instruments <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$^{\prime }$</tex-math></inline-formula> DSP TMS320F28335.