Single Phase Low Voltage On-board Charger for Plug-in Electric Vehicle (PEV) Charging applications

Abstract

This dissertation mainly emphasis on charging of electric batteries through a single phase on-board bidirectional charger for charging of Electric Vehicles. The charger resides of following components: i) AC-DC full bridge bidirectional boost converter (120V AC to 400V DC), and ii) a half-bridge DC-DC buck converter. The motive of AC-DC converter controller is to supervene the Power (P-Q) commands provided by grid or utility. With the change in controllable commands, the parameters of DC side can be adjusted. The DC-DC converter is used to control dc voltage and hence thereby controlling the charging current. For each converter a separate controller is provided that maintains the balance between input power and output power. The controller for AC-DC converter is used to boost up the input grid voltage upto 400V dc. The charger must have to supervene the instructions/commands provided by grid or utility. The DC-DC converter is used to proselyte fixed voltage into variable voltage so that the current required for charging the battery can be restrained. This dissertation mainly focuses on Level-1 and Level-2 On Board charging system. The three types of chargers are used for the purpose of charging which are: i) 1.44kVA charger ii) 3.3kVA charger iii) 6.6kVA charger. The 1.44kVA type charger falls under the category of Level-1 charging system and 3.3kVA and 6.6kVA type chargers fall under the category of Level-2 charging system. The 6.6kVA charger is fast as compared to 3.3kVA charger and 1.44kVA charger. The parameters that are shown in tables in Chapter 3 are used to obtain the desired results as shown in Chapter 4. In this dissertation, the proposed charger is used to charge the plug-in hybrid electric vehicles (PHEV) and battery electric vehicles (BEV) in charging only operation. The block diagram of the Simulink Model and results of different charging levels are represented in this dissertation work.