Abstract
The introduction of electrical vehicle charging infrastructure including electric vehicle (EV) charger renewable energy resource at the secondary feeder in a distribution system has been increased as one of countermeasure for global environmental issues. However, the electric vehicle charging (EVC) infrastructure may act as the peak load in the distribution system, which can adversely impact on the voltage stability when the electric vehicle is quickly charged. Therefore, to keep within the limit capacity of a secondary feeder and allowable limit for the feeder voltage, this paper proposes a stabilization method by an energy storage system (ESS) control strategy at the secondary feeder to not exceed the upper limit or fall below the lower limit. In addition, this paper presents an estimation method to keep the proper standard value of the state of charge (SOC). From the simulation results, the voltage stabilization operation by the ESS should make the feeder voltages of the distribution system (secondary feeder) introduced EVC infrastructure keep better voltage conditions. In addition, the estimation method was able to keep the proper standard value confirming that the SOC of the ESS when it is in standby can be kept within the proper reference range. Therefore, it is confirmed that this strategy is an effective tool to solve the voltage problems by ESS.
Highlights
As power systems have been deregulated and decentralized according to technological development of small-scale electric vehicle charging infrastructure, including electric vehicle (EV)chargers, renewable energy resources (RES) have been actively interconnected and operated at the secondary feeder in distribution systems
This paper presents the electric vehicle infrastructure stabilization (EVI) algorithm to keep an allowable limit for power and voltage at the secondary feeder through the energy storage system (ESS) introduction with an electric vehicle and renewable energy resource at the end of the section
The stabilization operation by ESS should enable the feeder voltages of the distribution system integrated with electric vehicle charging (EVC) infrastructure to keep the voltage in normal conditions
Summary
When the electric charging system, including a renewable energy resource, is operated in the secondary feeder, the feeder voltage is increased than allowable limit byinthe. At this time, the secondary feeder voltages are dropped or raised by the relationship between fixed impedance and the current capacity at the prior sections of an ESS site. To operate the ESS introduced in the electric charging system, this paper presents a method to determine the line impedance based on the voltage and the passing current on the existing secondary feeder with a RES and EV infrastructure. This paper presents a method to keep the allowable limit for (∑m t 1 Ici (t)) − T(∑t 1 Ici (t))
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