Train based on virtual synchronous generator technology uninterrupted phase-separation passing study

Abstract

The problem of large speed loss exists in the traditional passing through the electric phase-separation method of trains, which is more prominent when trains pass through an electric phase-separation zone in the uphill section of long ramps and may lead to the trains not passing through the phase-separation zone safely. In order to solve this problem, based on the energy storage type railroad power conditioner, a train uninterrupted phase-separation passing system based on the energy storage type railroad power conditioner is proposed. The energy storage railroad power conditioner can realize the recovery and utilization of regenerative braking energy of the electrified railroad. In the structure of the energy storage railroad power conditioner, the single-phase inverter is led from the middle DC side of the energy storage railroad power conditioner and connected to the neutral line through the LCL filter and the step-up transformer, which constitutes an uninterrupted phaseseparation passing system. The single-phase inverter is controlled using virtual synchronous generator technology, which allows the single-phase inverter to have external characteristics similar to those of a synchronous generator, providing support for the voltage and frequency in the neutral zone. The power required by the train to pass the electric phase-separation is provided by the power supply arm or the energy storage system, which not only improves the utilization rate of regenerative braking energy but also realizes the uninterrupted phaseseparation passing of the train through the control of the voltage in the neutral region.

Optimal configuration of energy storage system capacity in traction power supply system considering photovoltaic consumption

“…Based on the energy storage type RPC structure, a hierarchical optimization approach is introduced to address the challenges of negative sequence compensation and regenerative braking energy utilization in electrified railways [14]. Reference [15] proposes a train uninterrupted phase-separation passing system based on the energy storage type RPC, achieving constant power during the entire process of train passing phase separation and effectively avoiding electric power separation problems caused by the deceleration of trains on uphill sections of long ramp roads. Some have proposed the incorporation of PV and the energy storage system (ESS) at the intermediate DC link of the RPC, intending to employ it as a PV power generation system for traction purposes in railways [16].…”