Verifying Capability of Bidirectional Battery Charger of Electric Vehicles as a Power Conditioner

Current research initiatives on the road vehicles are focused toward the development of plug-in electric vehicles (PEV) that draw the travel energy from the utility, thus dispensing with the gasoline. By using bidirectional AC-DC power converters to interface the grid with the PEV batteries, the vehicle-to-grid (V2G) approach is enabled, by which the PEV batteries can work as distributed storage systems that deliver electric energy to the grid under peak power requests as well as to execute ancillary functionalities such as to stabilize the grid voltage by injecting reactive power and to improve the power grid quality by filtering current harmonics. In this paper a Bidirectional Battery Charger (BBC) is considered that supplying its own load and in the same time compensating neighborhoods nonlinear loads: diode rectifier/PWM Inverter. Power capability of BBC is calculated when it has an active filtering function. This is done by computing the BBC current as a function of load power, load power factor and active power which can be delivered by the BBC. This capability should be calculated correctly otherwise a converter will not be able to deliver demanded power to the load or to proper compensation of nonlinear load.

Keywords:

Bidirectional Battery Charger , Electric Vehicle , Compensation