Abstract:
The power system is a very complex and sensitive to sudden change in load, line trip Ping, generator problem and is landing of grid. These conditions create voltage, current and frequency transients on the utility grid. The second issue is the overloading of the distribution system in which the distribution system is over stressed and increase the losses of the distribution lines and distribution transformer. In these situations, the protection system will operate and continuity of the service will disturb the distribution system due to load shedding. According to these difficulties, the stability and service continuity of the distribution system is a challenging task. In this research, Electric Vehicles batteries are used for overcoming the discontinuity of service, overloading and transient conditions of the distribution system due to their rapid response, efficient control and minimum cost. In this research, introduce a two-way power deliver in which the regulation of charging and discharging of electric vehicle batteries has been introduced to overcome the overloading, line trip Ping and transient conditions of the distribution system. When power will deliver from utility grid to electric vehicle batteries then the charging current of electric vehicle batteries will be controlled according to the distribution load and protect the distribution transformer and distribution lines to overloading. When the secondary load of the distribution transformer will increase the charging current of the electric vehicle batteries will be decreased by using the charging station controller and protect the distribution transformer to overloading. When the load on the secondary side of the distribution transformer will increase more than the charging curreiff the electric vehicle batteries will be zero and battery charging will be stopped. When the load on the secondary side of Lho distribution transfomtcr will increase to a specific limit then electric vehicle batteries will start to discharging and provide the power to distribution loads and protect the distribution transformer and distribution lines to overloading without load shedding. When the secondary load of the distribution transformer will decrease, the batteries charging current will increase again and Electric Vehicle Batteries charge to its full rating.
