The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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An Analysis on the Stability of the Electric Vehicles Connected Power System According to Charging Cost with Price Elasticity

가격탄력성을 이용한 전기자동차 충전요금제에 따른 연계계통의 안정성 분석

  • Kim, Junhyeok (Dept. of Electrical and Electronic Engineering, SungKyunkwan Univerity, Korea/Metropolitan Transportation Research Center, Korea Railroad Research Institute) ;
  • Kim, Joorak (Metropolitan Transportation Research Center, Korea Railroad Research Institute) ;
  • Kim, Chulhwan (Dept. of Electrical and Electronic Engineering, SungKyunkwan University)
  • Received : 2015.06.08
  • Accepted : 2016.08.04
  • Published : 2016.09.01
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Abstract

Now we are facing severe environmental issues such as global warming. Due to these, the concerns about eco-friendly energy have been increased. Kyoto protocol and Copenhagen climate change conference are circumstantial evidence of it. With these trends, the interests for the Electric Vehicles(EVs) which do not emit any harmful gases have gradually been raised. Unfortunately, however, massive connection of EVs to the power system could cause negative impacts such as voltage variations, frequency variations and increase of demand power. To prevent the mentioned issues, KEPCO adopts Time-of-Use(ToU) price for EVs charging. Nevertheless, it is important to verify the propriety of the charging system. In this paper, therefore, we used pre-introduced price elasticity concept to predict possible Demand Response(DR) on charging of EVs. And analyzed possible demand power increase according to various price elasticities. Simulation results show that given ToU based charging system would not enough to control the increase of demand power by EVs on the power system. It is concluded, therefore, additional methods and/or algorithms are required.

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