Abstract
Direct current (DC) traction power systems are widely used in metro transport systems, with running rails usually being used as return conductors. When traction current flows through the running rails, a potential voltage known as “rail potential” is generated between the rails and ground. Currently, abnormal rises of rail potential exist in many railway lines during the operation of railway systems. Excessively high rail potentials pose a threat to human life and to devices connected to the rails. In this paper, the effect of regenerative power distribution on rail potential is analyzed. Maximum safety regenerative power tracking is proposed for the control of maximum absolute rail potential and energy consumption during the operation of DC traction power systems. The dwell time of multiple trains at each station and the trigger voltage of the regenerative energy absorbing device (READ) are optimized based on an improved particle swarm optimization (PSO) algorithm to manage the distribution of regenerative power. In this way, the maximum absolute rail potential and energy consumption of DC traction power systems can be reduced. The operation data of Guangzhou Metro Line 2 are used in the simulations, and the results show that the scheme can reduce the maximum absolute rail potential and energy consumption effectively and guarantee the safety in energy saving of DC traction power systems.
Highlights
Direct current (DC) traction power system is widely used in metro transport systems, with running rails usually being used as return conductors
Summary and Conclusions results show that the control of maximum absolute rail potential based on regenerative power maximum safety the regenerative power tracking has been proposed to control the management can effectively decrease energy consumption
Summary and Conclusionsscheme, the train diagram and trigger voltage of regenerative energy absorbing device (READ) are optimized based on the improved particle swarm optimization (PSO) algorithm
Summary
Direct current (DC) traction power system is widely used in metro transport systems, with running rails usually being used as return conductors. The running modes of trains during the operation of railway systems will affect the rail potential and stray current [9,13] These studies are based on simulation models with single or double power sections, and the effect of power distribution on rail potential when multiple trains run in multiple sections is ignored. For the energy saving and abnormal rise of rail potential caused by regenerative power distribution, maximum safety regenerative power tracking is proposed to control the maximum absolute rail potential and system energy consumption. An improved particle swarm optimization (PSO) algorithm is proposed to optimize the trains’ dwell time and trigger voltage of READ, the maximum absolute rail potential is reduced effectively and lower energy consumption is achieved. Line 2 in China, the effect of control on maximum absolute rail potential and energy consumption with regenerative power management are shown
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