Stochastic Optimization of Braking Energy Storage and Ventilation in a Subway Station

In the Paris subway system, stations represent about one-third of the overall energy consumption. Within stations, ventilation is among the top consuming devices; it is operated at maximum airflow all day long, for air quality reasons. In this paper, we present a concept of energy system that displa...

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Bibliographic Details
Published in:IEEE transactions on power systems 2019-03, Vol.34 (2), p.1256-1263
Main Authors: Rigaut, Tristan, Carpentier, Pierre, Chancelier, Jean Philippe, De Lara, Michel, Waeytens, Julien
Format: Article
Language:English
Subjects:
Air flow
Air quality
Algorithms
Atmospheric modeling
Batteries
Braking
Dynamic programming
Energy
Energy consumption
Energy costs
Energy management
Energy storage
Mathematical model
Mathematical models
Mathematics
Optimization
Optimization and Control
Optimization methods
Predictive control
Public transportation
stochastic optimal control
Stochastic processes
Subway stations
Ventilation
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Summary:In the Paris subway system, stations represent about one-third of the overall energy consumption. Within stations, ventilation is among the top consuming devices; it is operated at maximum airflow all day long, for air quality reasons. In this paper, we present a concept of energy system that displays comparable air quality while consuming much less energy. The system comprises a battery that makes it possible to recover the trains braking energy, arriving under the form of erratic and strong peaks. We propose an energy management system that, at short time scale, controls energy flows and ventilation airflow. By using proper optimization algorithms, we manage to match supply with demand, while minimizing energy daily costs. For this purpose, we have designed algorithms that take into account the braking variability. They are based on the so-called stochastic dynamic programming (SDP) mathematical framework. We fairly compare SDP-based algorithms with the widespread model predictive control (MPC) ones. First, both SDP and MPC yield energy/money operating savings of the order of one-third, compared to the current management without battery. Second, depending on the specific design, we observe that SDP outperforms MPC by a few percent, with an easier online numerical implementation.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2018.2873919