smart grid and electric vehicles instructor: nicholas f. maxemchuk members: yingjie zhou chen wang...
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*Smart Grid and Electric Vehicles
Instructor: Nicholas F. Maxemchuk
Members: Yingjie ZhouChen Wang
Xiangying Qian
*Recap the Project
*Power distribution becomes an important issue when power demand exceeds power supply . *As electric vehicles get more popular, for a period of time,
there could be a shortage of power generating facilities. In order to allow the use of electric vehicles grow at a normal rate, it is necessary to look for some techniques to charge all vehicles as fairly as possible.*Our objective is to find out and compare different types of
fairness schemes so as to meet the customers’ needs to a great extent.
*Schedule
Week Tasks1, 2, (Jan 30 – Feb 10) Background reading and literature
review3,4, (Feb 13 – Feb 24) Simulate a baseline charging system 5, 6 (Feb 27 – Mar 9)8, (Mar 19 – Mar 23)
Implement different types of fairness; Each of us is responsible for one specific fairness scheme.
9,10, (Mar 26 – Apr 6) Compare the results and make some conclusions.
11,12,13, (Apr 9 – Apr 27)
Write a technical paper.
*Progress
1. Set up simulation environment:*information of electric vehicles*charging habits*power on smart grid
2. Realize the basic fairness scheme – Round Robin3. Obtain some results using two metrics:*the fraction of electric vehicles without sufficient charge on
departure*the average departure delay
*Baseline System
1. Set up information of electric vehicles*Battery limit: 100 miles – 28kwh*Charge mode: 120V 15A – 1.8kw or nearly 6.5miles at
maximum power
*Baseline System
1. Set up charging habits*Total number of person leaving home to go to work
every half hour during a day time shift (8am corresponds to 6pm)*The arrival of electric vehicles is poison process: arrival
rate interarrival time satisfies exponential distribution.*Plug-in time for an electric vehicle is Gaussian distribution
truncated to 2 deltas. (mean=14 delta=4, unit: hour)*The departure process is obtained accordingly.
*Baseline System
1. Set up charging habits – contd.*Desired distance satisfies exponential distribution
truncated to [20, 90] miles desired energy*Current battery level is uniformly distributed between
0% to 30% of full battery energy.*Energy needed is calculated based on demand the
amount of charging periods (5 minute switch on/off intervals) for each electric vehicle
*Baseline System
1. Set up power*Summer daily load profile sampled hourly.
*Baseline System
1. Set up power – contd.*Peak ratio supplied power *Penetration available power per hour available power
per 5 minute *Charge mode the number of electric vehicles that is
able to be charged per 5 minute *Daily power distribution power distribution for a
period
*Baseline System
2. Realize the basic fairness scheme – Round Robin*Round Robin based system works in the way that – If 20 cars
waited to be charged, and the power company can merely charge 15, then in the first 5 minute it will charge cars 1 to 15, in the second cars 16 to 20 and 1 to 10, in the third cars 11 to 20 and 1 to 5, and so on so forth. *Eventually each car receives the same charge.*In real implementation, run round robin every 5 minute to
achieve real-time coordination.*Two cases: sufficient power/ insufficient power for all cars in
the waiting list
*Baseline System
2. Round Robin algorithm*Create a waiting list based upon arriving times of the cars
that need to be charged.*Check which of the two cases applied.*Charge a fixed number of cars in the front of the waiting list.*Update the cars’ information.*Update the waiting list: adding new arrivals, removing the
cars that finish charging and reordering the waiting list.
*Baseline System
3. Obtain some results using two metrics:*Run the baseline system for successive days.*Take the measurements from the day to ensure correct and
reasonable initializations.*Take the measurements till day to enforce all cars
departing by the end of measurements, so that we can tell the particular delay for a car if its departure is delayed. *Two metrics with tuned input arguments: number of days
and penetration
*Results
*Results
*Results
*Any Question?
Thank you very much!
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