Abstract
Providing uninterrupted electricity service aboard the urban trains is of vital importance not only for reliable signaling and accurate traffic management but also for ensuring the safety of passengers and supplying emergency equipment such as lighting and signage systems. Hence, to alleviate power shortages caused by power transmission failures while the uninterruptible power supplies installed in the railway stations are not available, this paper suggests an innovative traction drive topology which is equipped by an onboard hybrid energy storage system for railway vehicles. Besides, to limit currents magnitudes and voltages variations of the feeder during train acceleration and to recuperate braking energy during train deceleration, an energy management strategy is presented. Moreover, a new optimal model predictive method is developed to control the currents of converters and storages as well as the speeds of the two open-end-windings permanent-magnet-synchronous-machines in the intended modular drive, under their constraints. Although to improve control dynamic performance, the control laws are designed as a set of piecewise affine functions from the control signals based on an offline procedure, the controller can still withstand real-time non-measurable disturbances. The effectiveness of proposed multifunctional propulsion topology and the feasibility of the designed controller are demonstrated by simulation and experimental results.
Highlights
The sustainable development of urban public transport has been considered as an important necessity for achieving environmental protection, viable economy, and social equity goals [1]
Most importantly, during failures in the power system lines or a blackout, the energy stored in the onboard energy storages (ESs) can make it possible to move the electric trains and trams (ETs) to the nearest railway station for evacuating passengers from the stalled vehicle, especially when it sticks in a tunnel, without the need of external power supply
This topology can offer both the ability of the electric regenerative braking and multilevel operation that can increase the multi-machine drive (MMD) functionality. To control both speed and currents of each open-end winding (OEW)-Permanent Magnet Synchronous Machines (PMSMs) in the proposed MMD, an offline design in a cascade structure is provided for the control unit, which is planned based on the model predictive control (MPC) method
Summary
The sustainable development of urban public transport has been considered as an important necessity for achieving environmental protection, viable economy, and social equity goals [1]. Energy storages (ESs) have been considered as a solution for matching the fluctuating power of these natural resources to the changing demand of the railway tractions [2]. These facilities can be advantageous to make maximum use of such energy sources by storing the regenerative braking energy of the ETs into the ESs, for the sake of power peak shaving. The sustainable railway development depends on proper reliability for its power supply system This is because any failure in this system can affect the operation of trains and the railway infrastructure [4] and may have a wider adverse impact on other sectors such as supportability, health, and politics [5]. For the sustainable and efficient transport development, employing both ESs and APSs on board the railway vehicles, is essential to keep the ETs moving safely, promptly and efficiently (The list of all acronyms used in the text is presented in Appendix A)
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