DC-link free grid integration of bi-directional inductive power transfer systems

Matrix converter (MC) based bi-directional inductive power transfer (BD-IPT) is an efficient and reliable technique for supplying wireless power to several grid connected applications such as vehicle-to-grid (V2G) systems. However, complex current commutation algorithms, modulation schemes and auxiliary circuits are essentially required for safe operation of the MC, making MC based BD-IPT systems more complicated and expensive. This paper therefore presents a new technique for grid integration of BD-IPT systems without employing a DC-link capacitor. A mathematical model is presented to show that both magnitude and direction of power flow can be controlled by regulating the relative phase angles of the voltages generated by converters. The validity of the presented mathematical analysis is verified through simulation results of a 2.5 kW model and results suggest that the proposed system is more efficient with lesser semiconductor losses and is capable of delivering a higher power output over MC based BD-IPT systems.