CHARGING SYSTEM OF THE BATTERY OF AN ELECTRIC VEHICLE

Abstract

This project presents the design and implementation of a single-phase on-board bidirectional plug-in electric vehicle (PEV) charger that can provide reactive power support to the utility grid in addition to charging the vehicle battery. The topology consists of two-stages: 1) a full-bridge ac–dc converter; and 2) a bidirectional dc–dc converter. It also implements a unified controller to follow utility PQ commands in a smart grid environment. The cascaded two-stage system controller receives active and reactive power commands from the grid, and results in line current and battery charging current references while also providing a stable dynamic response. The vehicle’s battery is not affected during reactive power operation in any of the operation modes. The system described above, is performed in the same environment, using two different controllers. The first controller used is the convention PID controlling and the second one used is the model predictive controlling, which is quite in trend these days, owing to its predictability of the reference of the controlled variable for the next state. This ability of the predicting the desired behavior of the system in future, based on its behavior in present, helps the system to become more active, reacting fast to the change in controlling actions and also giving less deviation from the desired response within a reduced settling time.