Abstract
To relieve the contradiction between supply and demand, a multi-port power conditioner (MP-PC) and control strategy with renewable energy access for a railway traction system is presented, which is mainly composed of full-bridge-based MMC and isolated DC/DC converters. As for the full-bridge-based MMC, the equivalent model is established and its novel voltage control method is proposed, which can provide a medium/low-voltage DC-link. A renewable energy system is connected to the system through the DC-link, so the MP-PC can achieve on-site consumption and balance between the load power and output power of RESs. Meanwhile, with the proposed control strategy, MP-PC can achieve three-phase power balance control and improve the operation performance of the railway traction system. Finally, the traction power platform and simulation model are established in the lab, and the topology and control strategy of MP-PC are verified effectively.
Highlights
Distributed renewable energy systems (RESs), due to their pollution-free and flexible features, have been extensively applied in the various practical fields, such as dc microgrids and electric vehicles [1,2,3,4]. Wide dissemination of these new power supply modes integrated with RESs has resulted in re-thinking and reformation in other industries, typically including railway traction power supply systems (TPSSs) [5,6,7]
The proposed design can realize the balance between the supply and demand in TPSS by means of an interface of RESs while, on the other hand, the conditioner can regulate the power quality of the railway power system according to the corresponding methods [35,36]
A multi-port and -functional power conditioner with renewable energy access for a railway power system was proposed to achieve the goal of on-site consumption and balance between the load power and output power of RESs
Summary
Distributed renewable energy systems (RESs), due to their pollution-free and flexible features, have been extensively applied in the various practical fields, such as dc microgrids and electric vehicles [1,2,3,4]. TPSS and facilitating the connectivity of heterogeneous RESs without dumping the ac catenary It can alleviate the contradiction of the supply and demand of the energy and manage the inherent power quality problems in high-speed railway TPSSs, including negative-sequence currents and reactive power [13,14,15]. The proposed design can realize the balance between the supply and demand in TPSS by means of an interface of RESs while, on the other hand, the conditioner can regulate the power quality of the railway power system according to the corresponding methods [35,36].
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