Predictive Traffic Regulation for Metro Loop Lines Based on Quadratic Programming

Author:

Fernandez A1,Cucala A P1,Vitoriano B1,de Cuadra F1

Affiliation:

1. Escuela Técnica Superior de Ingeniería, Universidad Pontificia Comillas, Madrid, Spain

Abstract

This article proposes a predictive traffic regulation model for metro loop lines on the basis of the optimization of a cost function along a time horizon. The regulation strategies typically compensate timetable and headway deviations modifying the train run times. The existing optimization methods are based on simplified traffic models with analytical solutions or based on more realistic models (usually non-linear) that have real-time computational limitations. A quadratic programming model is proposed here, suitable to include in an efficient way the main operation constraints: minimum interval, limits in the control actions, and the typical operation criterion of preventing the actuation of signalling systems between platforms. Efficiency is measured by the computing time required to solve long-term predictive models with standard optimization tools. Long-term prediction improves regulation performance and stability and simplifies the tuning of regulation parameters according to the operation requirements. The use of standard optimization tools improves the implementation of the proposed regulator and its maintainability. Although the proposed method is valid for both timetable and headway operation, the analysis in the article is focused on headway operation. In this case, it is possible to observe the offered commercial speed and to adjust the quality criteria that will measure the performance of the headway operation.

Publisher

SAGE Publications

Subject

Mechanical Engineering

Reference10 articles.

1. Traffic modeling and state feedback control for metro lines

2. Ferández A., de Cuadra F., García A. SIRO: an optimal regulation system in an integrated control centre for metro lines. In Proceedings of COMPRAIL'96, Berlin, August 1996, vol. 2, pp. 299–308 (Computational Mechanics Publications, Southampton).

3. Metro traffic regulation from the passenger perspective

4. Generation of optimal schedules for metro lines using model predictive control

5. Traffic dynamics of automated transit systems with pre-established schedules

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