Abstract
This paper presents an efficient data-driven building electricity management system that integrates a battery energy storage (BES) and photovoltaic panels to support decision-making capabilities. In this micro-grid (MG) system, solar panels and power grid supply the electricity to the building and the BES acts as a buffer to alleviate the uncertain effects of solar energy generation and the demands of the building. In this study, we formulate the problem as a Markov decision process and model the uncertainties in the MG system, using martingale model of forecast evolution method. To control the system, lookahead policies with deterministic/stochastic forecasts are implemented. In addition, wait-and-see, greedy and updated greedy policies are used to benchmark the performance of lookahead policies. Furthermore, by varying the charging/discharging rate, we obtain the different battery size \( \left( {E_{s} } \right) \) and transmission line power capacity \( (P_{max} ) \) accordingly, and then we investigate how the different \( E_{s} \) and \( P_{max} \) affect the performance of control policies. The numerical experiments demonstrate that the lookahead policy with stochastic forecasts performs better than the lookahead policy with deterministic forecasts when the \( E_{s} \) and \( P_{max} \) are large enough, and the lookahead policies outperform the greedy and updated policies in all case studies.
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Abbreviations
- \( EMP_{t} \) :
-
Electricity market price at time period \( t \) ($/kWh)
- \( D_{t} \) :
-
Total demand at time period \( t \) (kW)
- \( g_{t}^{ + } \) :
-
Power bought from the main grid at time period \( t \) (kW)
- \( g_{t}^{ - } \) :
-
Power from solar panels sold to the grid at time period \( t \) (kW)
- T :
-
Total time periods
- \( \delta \) :
-
Yearly capital recovery factor
- a :
-
Battery equivalent capital cost with respect to energy size ($/kWh)
- cr :
-
Battery charge upper limit
- b :
-
Battery equivalent capital cost with respect to power size in $/kW
- \( \Delta T \) :
-
Time step size
- \( I_{t} \) :
-
Inventory level of the battery at time period \( t \) (kWh)
- \( D2_{t} \) :
-
Demand satisfied by the battery at time period \( t \) (kW)
- \( R_{t} \) :
-
Electricity from the battery sold back to the grid at time period \( t \) (kW)
- \( BC_{t} \) :
-
Amount of electricity increased in the battery due to charging at time period \( t \) (kW)
- \( PV_{t} \) :
-
Solar power generation at time period \( t \) (kW)
- \( P_{max} \) :
-
Power capacity limit of the HVDC transmission system (kW)
- e :
-
Battery storage efficiency
- dc :
-
Battery discharge rate
- \( E_{s} \) :
-
Battery storage size (kWh)
- \( n \) :
-
Total years of the battery usage life
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This Project and the preparation of this publication were funded in part by monies provided by CPS. Energy through an agreement with The University of Texas at San Antonio. © CPS Energy and the University of Texas at San Antonio.
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Chen, Y., Castillo-Villar, K.K. & Dong, B. Stochastic control of a micro-grid using battery energy storage in solar-powered buildings. Ann Oper Res 303, 197–216 (2021). https://doi.org/10.1007/s10479-019-03444-3
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DOI: https://doi.org/10.1007/s10479-019-03444-3