Hybrid railway vehicle trajectory optimisation using a non‐convex function and evolutionary hybrid forecast algorithm

• Published in: IET intelligent transport systems 2023-12, Vol.17 (12), p.2333-2351
• Main Authors: Din, Tajud, Tian, Zhongbei, Bukhari, Syed Muhammad Ali Mansur, Hillmansen, Stuart, Roberts, Clive
• Format: Article
• Language: English
• Subjects: hybrid railway vehicle; mayfly algorithm; non‐convex optimisation; rosenbrock function; trajectory optimisation
• ISSN: 1751-956X; 1751-9578
• DOI: 10.1049/itr2.12406

This paper introduces a novel optimisation algorithm for hybrid railway vehicles, combining a non‐linear programming solver with the highly efficient “Mayfly Algorithm” to address a non‐convex optimisation problem. The primary objective is to generate efficient trajectories that enable effective power distribution, optimal energy consumption, and economical use of multiple onboard power sources. By reducing unnecessary load stress on power sources during peak time, the algorithm contributes to lower maintenance costs, reduced downtime, and extended operational life of these sources. The algorithm's design considers various operational parameters, such as power demand, regenerative braking, velocity and additional power requirements, enabling it to optimise the energy consumption profile throughout the journey. Its adaptability to the unique characteristics of hybrid railway vehicles allows for efficient energy management by leveraging its hybrid powertrain capabilities. The optimised trajectories demonstrate an average reduction of 16.85% in total energy consumption, showcasing the algorithm's effectiveness across diverse routes and conditions, with an average increase in journey times of only 0.40% and a 15.18% reduction in traction power. The algorithm achieves a well‐balanced energy‐time trade‐off, prioritising energy efficiency without significantly compromising journey duration. This balance is essential in sustainable transportation systems. Reducing energy consumption and emissions is vital without severely impacting service quality and travel times.