Power Factor Correction for a Bidirectional On-Board Charger for Electric Vehicles and Plug-in Hybrid Electric Vehicles - A fundamental study of the bidirectional totem-pole PFC
Year: 2018
Type: dissertation
Abstract: With the beginning implementation of a smart grid in industrialized countries increasing\nthe load flexibility of customers, as well as communication with the grid\noperators, a potential market for bidirectional on-board chargers (OBC) is emerging.\nThe OBC is the electric vehicle charger located within the vehicle, operating\nas a link between the DC-voltage battery and the AC grid voltage in electricity\nsockets anywhere, thus working at a universal voltage range (85Vrms-265Vrms)\nwith rated power in the range of 1.9kW to 3.5kW. To maximize the real power\ndrawn by these OBCs, they are designed with power factor correction (PFC) converters\nat the AC grid interface, shaping the drawn AC current sinusoidally and\nin phase with the AC voltage, to maximize the power factor. Thus, a bidirectional\nOBC would necessarily require a bidirectional PFC. In this master s thesis,\na simulation model is developed for a bidirectional totem-pole PFC, attempting\nto verify the use of this topology as the mentioned bidirectional OBC PFC. The\nwork is focused on describing the basic bidirectional operation of the bidirectional\ntotem-pole PFC, deriving expressions for currents, voltages and losses, as well as\nfor the gate logic and control system. Average current mode control is used, with\ncascaded current and voltage control including PI controllers and Symmetrical optimum\ntuning. To verify the simulation model for the power levels and demands\nof an OBC, the main components are dimensioned to achieve 98% efficiency at\n230Vrms, 3.5kW and 90kHz switching frequency, implementing GaN eHEMTs in\nthe fast-switching leg of the totem-pole. At last, simulations are performed, showing\nthat the PFC is able to achieve a power factor of 0.998 and a THD of 5% in\nboth G2V and V2G, without a DM filter on the AC side.
Author: Sondre Westby Johannessen
Language: English
Topic: Advanced DC-DC Converters
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2897287048