A Study of Power Factor Improvement in Electrical Vehicle Applications

Electrical & Electronics Engineering

The main aim of this study the A front-end AC-DC PFC converter is used to convert grid AC voltage into DC voltage to charge the EV battery. A unidirectional AC-DC converter consists of a diode rectifier with PFC circuit. This kind of AC-DC converter enables the power flow only from the grid to EV charger. However, the bidirectional type ACDC converter or inverter will be used if the EV battery is meant to release power into the grid for vehicle to grid operation. Higher switching frequencies aren't utilized in power converters since they're proportional to the switching losses. By applying ZVS and ZCS soft switching strategies this particular effort helps to utilize higher switching frequency for the AC DC PFC power converter of EVs with little switching losses. The soft switching of AC DC converters reduces the switching losses, reduces switching stresses and hence improves the vii efficiency of the battery charged vehicle system. In order to enhance the performance as well as reliability of AC DC PFC converters, soft switching methods are actually applied by means of the unique snubber circuits.The enhancement of total charger effectiveness is a lot essential for the growth as well as recognition of the vehicular technologies, since as the charging efficiency goes up, the charge time as well as electric price decline. Because of insufficient area of cars as well as the increasing power usage, chargers have to supply much more power keeping the size of theirs as little it can be. As a major component of a charging system, the front end AC DC converter must recognize less input current harmonics, PFC, output voltage regulation, higher efficiency and higher power density.With this work, many snubber circuits for the front end AC DC PFC converter of EV charging is actually examined as well as proposed. A comprehensive systematic item for these converter topologies is actually produced, facilitating the estimation of power losses as well as efficiency. Experimental outcomes and the simulation of the front end AC DC boost converter with a regulated DC voltage of 400 V from common AC input voltage of 230 V at 1.5 KW are actually reported in this specific thesis to evaluate the effectiveness of theirs in phrases of Total Harmonic Distortion (THD), PF, switching efficiency and losses.

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