DQ current control of a bidirectional, isolated single-stage AC-DC converter

Abstract

Electric vehicles provide portable energy storage that can be used in Vehicle-to-Grid (V2G) applications. In order to source power to the grid, the power electronics on-board these vehicles must be bidirectional. A single stage bidirectional isolated AC-DC converter is discussed. A modulation scheme for this topology is proposed to provide control of real and reactive power. A control scheme is coupled with the modulation and allows the topology to act as an inductive or capacitive or load while sinking or supplying power. The proposed modulation scheme can charge the electric vehicle battery as well as provide ancillary services to the grid. The modulation and control scheme are analyzed and discussed. Simulation and hardware results are presented.

An Overview of Bidirectional AC-DC Grid Connected Converter Topologies for Low Voltage Battery Integration

“…Of course, for application to connect 48 V battery the efficiency will be lower but the topology have low number of switches and control of the converter is not very complicated. Improved control algorithm of similar topology is presented in [14]. Additional benefit gives possibility to develop multilevel converter.…”