Abstract
This paper proposes a centralized-decentralized control strategy for regenerative braking energy utilization and power quality improvement in the modified AC-fed railway system with energy-storage-based smart electrical infrastructure. The proposal of a centralized-decentralized control strategy can enhance the ability to withstand and rapidly recover from disruptions, thus providing further guarantees for safe and reliable operation and energy conservation for railway systems. First of all, the description and control strategy of the modified railway system are outlined, and then the control principles and implementation process of the centralized control and decentralized control strategies are given. Moreover, a method of load power detection and regulated power reference calculation is proposed. Finally, the effectiveness of the proposed strategy is verified in a case of a modified railway system consisting of four traction substations and eight power supply sections. The results demonstrate that regenerative braking energy can be efficiently utilized in railways and that power quality can be improved using the proposed centralized-decentralized control strategy.
Highlights
The railway is an important impetus of a national economy, provides critical infrastructure and major livelihood projects, and is one of the backbones and main transportation modes of an integrated transportation system
If the energy management system (EMS) or communication equipment fail, the system switches to decentralized control to continuously realize the utilization of regenerative braking energy (RBE) and power quality improvement
alternating current (AC)-fed railway system, this paper proposes a centralized-decentralized control strategy for RBE
Summary
The railway is an important impetus of a national economy, provides critical infrastructure and major livelihood projects, and is one of the backbones and main transportation modes of an integrated transportation system. If there are no traction locomotives or there are braking locomotives in the adjacent power supply sections, RBE cannot be effectively utilized To solve this limitation, a PTD with the ESS (EPTD) is proposed to store surplus RBE (such as an RPC with an ESS [32,33] or an RPC with a super capacitor [34]). An energy-storage-based smart electrical infrastructure is proposed to solve these problems by installing PTDs and EPTDs in all NZs [36] This scheme can deliver RBE between different power supply sections, and store surplus RBE. This paper proposes a centralized-decentralized control strategy for RBE utilization and power quality improvement in a modified AC-fed railway system with an energy-storage-based smart electrical infrastructure.
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