Abstract
Reliability is an important index which determines the power service and quality provided to customers. As the demand increases continuously and the system changes in accordance with the environmental regulation, the reliability assessment in the distribution system becomes crucial. In this paper, we propose methods for improving the reliability of the distribution system using electric vehicles (EVs) in the system. In this paper, EVs are used as power supplying devices, such as a transportable energy storage system (ESS) which supplies power when fault occurs in the system, and by using a time–space network (TSN) in particular, EV capacity in accordance with the load arrival time was calculated. Unlike other existing reliability assessments, we did not use the average load of customers. Instead, by taking into account the load pattern by times, we considered the priority for load supply in accordance with the failure scenarios and failure times. Based on the priority calculated for each time of failure and failure scenario, plans for EV operation to minimize expected customer interruption cost (ECOST), the reliability index in the distribution system, were established. Finally, a case study was performed using the IEEE RBTS (Roy Billinton Test System) 2 Bus and the performance of the model proposed in this paper was verified based on the result.
Highlights
Reliability is an important factor in determining the quality of the service provided to customers in the power sector, and assessment of reliability is an essential element in planning and operating the power system to supply high-quality power to customers stably in response to a continuous increase in power demand [1,2,3]
We propose the time–space network (TSN) modeling method using electric vehicles (EVs) so that it can be applied to various systems and verify the system reliability improvement method proposed in this paper in a more complex environment than the previous study [26]
N-1 contingency in the system is taken into account, and the 3-phase short circuit fault which was influenced by the fault the most is assumed to have occurred; The fault occurs at the head of the feeder leading to load and it makes all loads impossible to be supplied from the power grid; After the fault occurred, the fault area is islanded by the operation of the protection devices such as breakers, reclosers and fuses; expected customer interruption cost (ECOST) occurs in accordance with the power consumption and fault duration in the islanded areas until the fault is cleared
Summary
Reliability is an important factor in determining the quality of the service provided to customers in the power sector, and assessment of reliability is an essential element in planning and operating the power system to supply high-quality power to customers stably in response to a continuous increase in power demand [1,2,3]. Average Interruption Duration Index (SAIDI) which is one of the distribution system reliability indices in 2020 For such reasons, studies on improving the reliability in various ways have been carried out across nations, and globally in recent years, using the demand responses and line connections, as well as utilizing distributed energy resources (DERs), energy storage systems (ESSs) and introducing renewable energies [8,9,10,11,12]. Unlike the existing reliability improvement method, EVs provide a very flexible response to various fault scenarios because they can move directly to failure points, taking into account the hourly load priority, and providing power.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call