Abstract
In order to supply the single-phase locomotive load and mitigate the negative sequence current, this paper develops a V/V transformer-based connection and control strategy of three-phase photovoltaic (PV) converters integrated into railway traction power supply systems. In this V/V transformer-based connection, the two-phase traction voltage is converted into the three-phase voltage. This approach can offer a common low voltage AC bus, which is more convenient for more access to three-phase PV converters. Based on this V/V transformer-based connection, an individual phase current control strategy with the hybrid current reference is fully designed. In this control strategy, the current reference, containing two parts, is generated. One is the asymmetrical part for powering the single-phase locomotive load and mitigating the negative sequence current. The other is the symmetrical part for feeding the surplus power back to the utility grid. Then, each phase current replaces the dual-sequence current to be controlled to track the corresponding phase current reference. Consequently, PV converters can flexibly inject the symmetrical and asymmetrical currents without the dual-sequence extraction for a simpler implementation. Finally, the effectiveness of the developed connection and control strategy is validated by the simulation studies.
Highlights
In recent decades, renewable resources have attracted more attention and experienced a rapid increase in power generation due to concerns about climate change and environmental pollution [1,2].Among various types of renewable resources, wind and solar energy continue to dominate, with 176 GW renewable capacity expansion all over the world in 2019, jointly accounting for 90% of the total
This paper develops a V/V transformer-based connection and individual phase current (IPC) control strategy of PV converters integrated into railway traction power supply system (TPSS)
This paper develops a V/V transformer-based connection and IPC control strategy of PV converters integrated into railway TPSSs
Summary
Renewable resources have attracted more attention and experienced a rapid increase in power generation due to concerns about climate change and environmental pollution [1,2]. Several examples of PV generation installed in the rail sector are carried out without increasing land use, which effectively relieves the contradiction of the power supply and demand. The most common solution is to connect PV generation to the high voltage 110 kV or 220 kV bus of the railway feeder stations with no modification on railway traction power supply systems (TPSSs) [12,13]. Two AC ports of the single-phase cascaded H-bridge converter are directly connected to the railway traction network without transformers. The common focus of all the reference generation strategies is on directly regulating PSC and NSC for controlling the power oscillations in the three-phase system, which is considered only from the grid point of view.
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