An Optimized EV Charging Model Considering TOU price and SOC curve
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Transcript of An Optimized EV Charging Model Considering TOU price and SOC curve
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An Optimized EV Charging Model Considering TOU price and SOC curve
Authors: Y. Cao, S. Tang, C. Li, P. Zhang, Y. Tan, Z. Zhang and J. Li
Presenter: Nan Cheng2013.8.14
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Outline
Introduction
Optimal Model for EV Charging
Case Study
Conclusion
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Introduction (1)
EV charging loads increase in the near future– Negative impacts on stability – Risk system operations and management– 200 million EV in China in 2050 with charge load
330 MkW. Three ways for EV-friendly access the power grid
– V2G– Energy management equipment– Electricity pricing (Customers respond to price)
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Introduction (2)
Regulated electricity market (China)– Electricity remain unchanged once decided.– Catalog price, stepwise power tariff & time-of-
use (TOU) price – TOU price varies in different periods of a day.
This paper:– Proposes an optimized charging model to adjust
charging power and time based on TOU and SOC
– Reduce the cost of costumers– Balance load demand
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Problem Description
Formulate optimized charging scheme with a specific starting time and ending time– Consider TOU price– Consider SOC curve to determine the charging
constraints– Aim to minimize cost + peak clipping & valley
filling
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Objective Function
– : starting time of charging– : duration of charging– : unit price at time t– : charging power at time t
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Constraints
– : maximum power set by EV user– : maximum power EV charger can output– : maximum allowed charging power to
protect the battery based on the current state of charge.
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Constraints
SOC v.s. maximum charging power
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Algorithm (1)
The optimized model is discretized: T is divided into N periods, each with length .
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Algorithm (2)
A heuristic algorithm is proposed- i and j are ascending sorted sequences, i.e.,
- Energy q is optimal step for the algorithm, the corresponding power step .
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Algorithm (3)
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Case Study - Setting
Charging curve Distribution of start time
TOU price
Initial SOC distribution:
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Case Study – Results (1)
Single EV Multiple EVs
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Case Study – Results (2)
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• Response to TOU can reduce EV charging cost and meet the demand response requirements in regulated market.
Conclusions