Control of a 1.5 MW active power filter and regeneration converter for a Spoornet DC traction substation

[摘要] Although regenerative braking has been in used in railway systems for a long timealready, the energy generated was dissipated in resistor banks. The rapid advancesin the power electronics field, accompanied by the development of faster and higherpower switching devices in recent years, now make it possible to convert theregenerated electrical energy from DC to AC, which can then be injected into theEskom grid.A 1.5 MW full scale prototype system was built, installed and tested in a Spoornet DCtraction substation. A seven level series-stacked converter topology was used alongwith a specially designed injection transformer. The system was controlled by thePEC 33 controller board, which was developed at the University of Stellenbosch. Theprimary function of the system is to function as a regeneration converter and as asecondary function act as an active power filter.

[发布机构] Stellenbosch University