Distributed Hierarchical Coordination of Networked Charging Stations Based on Peer-to-Peer Trading and EV Charging Flexibility Quantification

Power systems are facing the challenges of integrating massive electric vehicles (EVs) and lacking operational flexibility. An optimal and efficient coordination strategy is needed to coordinate the operations among EV charging stations (CSs) and the distribution system operator (DSO) and to make fu...

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Vydáno v:	IEEE transactions on power systems Ročník 37; číslo 4; s. 2961 - 2975
Hlavní autoři:	Zhang, Jin, Che, Liang, Wan, Xin, Shahidehpour, Mohammad
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	New York IEEE 01.07.2022 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:	Coordination Couplings distributed optimization Distribution system electric vehicle Electric vehicle charging Flexibility game theory Mathematical analysis Mathematical models Optimization peer-to-peer Peer-to-peer computing Privacy Reactive power Security Strategy Topology
ISSN:	0885-8950, 1558-0679
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Abstract	Power systems are facing the challenges of integrating massive electric vehicles (EVs) and lacking operational flexibility. An optimal and efficient coordination strategy is needed to coordinate the operations among EV charging stations (CSs) and the distribution system operator (DSO) and to make full use of the EVs' charging flexibility for improving the operational flexibility of power systems. To this end, this paper proposes a CSs-DSO distributed coordination strategy. The proposed strategy integrates a supply-curve-based quantification method to quantify the EVs' flexibility contribution and a Nash bargaining game-theory-based peer-to-peer (P2P) transactions model for maximizing the profits of entities participating in the coordination. To tackle the CSs-DSO coordination problem that has a bi-level-parallel coupling structure, an analytical target cascading (ATC) and alternating direction method of multipliers (ADMM) jointly-based distributed solution approach is proposed. First, the CSs-DSO bi-level model is decoupled by ATC with tie-line power being the only exchanged information; then, the model is further decomposed for each CS by ADMM for protecting the CSs' privacy and autonomy. The effect of coordination and the computational efficiency of the proposed strategy is verified by numerical simulations on a modified IEEE 33-bus distribution system connecting multiple CSs.
AbstractList	Power systems are facing the challenges of integrating massive electric vehicles (EVs) and lacking operational flexibility. An optimal and efficient coordination strategy is needed to coordinate the operations among EV charging stations (CSs) and the distribution system operator (DSO) and to make full use of the EVs’ charging flexibility for improving the operational flexibility of power systems. To this end, this paper proposes a CSs-DSO distributed coordination strategy. The proposed strategy integrates a supply-curve-based quantification method to quantify the EVs’ flexibility contribution and a Nash bargaining game-theory-based peer-to-peer (P2P) transactions model for maximizing the profits of entities participating in the coordination. To tackle the CSs-DSO coordination problem that has a bi-level-parallel coupling structure, an analytical target cascading (ATC) and alternating direction method of multipliers (ADMM) jointly-based distributed solution approach is proposed. First, the CSs-DSO bi-level model is decoupled by ATC with tie-line power being the only exchanged information; then, the model is further decomposed for each CS by ADMM for protecting the CSs’ privacy and autonomy. The effect of coordination and the computational efficiency of the proposed strategy is verified by numerical simulations on a modified IEEE 33-bus distribution system connecting multiple CSs.
Author	Che, Liang Zhang, Jin Wan, Xin Shahidehpour, Mohammad
Author_xml	– sequence: 1 givenname: Jin surname: Zhang fullname: Zhang, Jin email: zhangjin1994@hnu.edu.cn organization: College of Electrical and Information Engineering, Hunan University, Changsha, Hunan, China – sequence: 2 givenname: Liang orcidid: 0000-0002-7004-6448 surname: Che fullname: Che, Liang email: lche@hawk.iit.edu organization: College of Electrical and Information Engineering, Hunan University, Changsha, Hunan, China – sequence: 3 givenname: Xin surname: Wan fullname: Wan, Xin email: 409595482@qq.com organization: Dadu River Hydropower Development Co. Ltd, Chengdu, Sichuan, China – sequence: 4 givenname: Mohammad orcidid: 0000-0002-8994-1688 surname: Shahidehpour fullname: Shahidehpour, Mohammad email: ms@iit.edu organization: Robert W. Galvin Center for Electricity Innovation, Illinois Institute of Technology, Chicago, IL, USA
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Cites_doi	10.1109/TSG.2019.2910216 10.1109/JSYST.2018.2851618 10.1109/TSG.2019.2918524 10.1109/TSG.2017.2735636 10.1109/TSTE.2020.2975040 10.1109/TSG.2014.2375067 10.1109/TSG.2021.3107896 10.1109/TIA.2020.3024268 10.1109/TSG.2018.2815593 10.35833/MPCE.2019.000326 10.1109/TSG.2020.2992863 10.1061/9780784482308.019 10.1109/TSG.2014.2387436 10.1186/s41601-020-00171-x 10.1109/TPWRS.2019.2946178 10.1109/TSG.2020.3032889 10.1109/TSG.2016.2593667 10.1109/JSYST.2020.2997189 10.35833/MPCE.2019.000139 10.1017/CBO9780511607950 10.1109/TII.2021.3054417 10.1109/TSG.2018.2789940 10.3390/en13195008 10.1109/TSG.2021.3080583 10.1109/TII.2016.2637879 10.1109/TSTE.2018.2870561 10.1109/TPWRS.2020.3040310 10.1109/JSYST.2020.3006848 10.1109/TSG.2020.3016597 10.1049/iet-stg.2019.0088 10.1109/TII.2018.2812755 10.1109/61.25627 10.1109/TSG.2020.3016476 10.1016/j.ijepes.2018.07.054 10.1109/JSYST.2020.3043327 10.1109/TII.2020.3003669 10.1109/TIA.2020.2990585 10.1109/TSG.2015.2427371
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References	ref13 ref12 ref34 Santos (ref44) 2011 ref15 ref37 ref14 ref31 ref30 (ref38) 2021 ref11 ref33 ref10 ref32 ref2 ref17 ref39 ref16 ref19 ref18 (ref35) 2021 (ref45) 2021 Shahidehpour (ref7) 2021 ref24 ref23 ref26 ref25 ref20 ref42 ref41 ref22 ref21 ref43 ref28 ref27 ref29 ref8 ref9 ref4 ref3 ref6 (ref36) 2021 ref5 ref40
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SubjectTerms	Coordination Couplings distributed optimization Distribution system electric vehicle Electric vehicle charging Flexibility game theory Mathematical analysis Mathematical models Optimization peer-to-peer Peer-to-peer computing Privacy Reactive power Security Strategy Topology
Title	Distributed Hierarchical Coordination of Networked Charging Stations Based on Peer-to-Peer Trading and EV Charging Flexibility Quantification
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