Given the"carbon-neutral"context,the large-scale integration of new energy sources into the traction grid can become a new trend in railway transportation.To address unexpected power outages and break through traditional energy barriers in the railway sector,a novel emergency power supply scheme was proposed.It utilized the traction grid-connected photovoltaic energy storage system to provide emergency traction for trains,and explored the low-frequency stability of the"photovoltaic-battery-vehicle network"coupled system.The control method for the RPC dual-mode single-phase full-bridge inverter was developed,combining the operation status coordination control strategy of the photovoltaic energy storage system to define working modes.The small-signal and state-space averaging method was applied to establish the impedance models of the photovoltaic and energy storage systems,the passenger vehicle(CRH3 type high-speed train),and the railway power conditioner in the dq coordinate system.The obtained impedance models of the three subsystems were used to introduce a passive criterion adaptable to various operating conditions.This criterion revealed the impact of controller parameters and multiple power sources on the electrical stability of the traction power supply system.The research results show that the proposed scheme can stably provide traction to trains using new energy and energy storage systems under various operating conditions,including day and night.In case of unexpected power supply failures from either new energy or the grid,the two sources can complementarily switch,ensuring stable train operation even in fault conditions.Furthermore,the photovoltaic storage voltage loop proportional gain has strong electrical sensitivity to the impedance matching stability of the system.The constructed model,combined with the passive criterion,guides the control parameters and compensates for the impedance of different power sources,addressing certain instability phenomena.The energy storage system in this scheme exhibits good compensation characteristics.The feasibility and stability of the"photovoltaic-battery-vehicle network"coupled system's emergency power supply scheme have been validated on the Starsim semi-physiological experimental platform.
new energy traction/emergency power supply/"photovoltaic-battery-vehicle network"coupling system/railway power regulators/small-signal model/passive criterion/Starsim
维普
万方数据