Auszug | eb - Elektrische Bahnen 6 | 2024

223 Rail Power Supply Engineering 122 (2024) Heft 6 New converter concept for reversible regulated DC traction substations Francisco Moreno, Armin Jafari, Rogerio Ferreira, Geneva (CH); Virgilio Valdivia, Javier Serrano, Madrid (ES) The Sécheron EFFICIENT BOOST is a robust, simple, and cost-effective technology for implementing fully reversible and controlled traction power substations (TPSS). It consists of an IGBT inverter connected to the secondaries of a diode rectifier transformer, which injects reactive power to indirectly control the output DC voltage. Neues Umrichterkonzept für reversible, geregelte Gleichstrom-Bahnunterwerke Der Sécheron EFFICIENT BOOST ist eine robuste, einfache und kostengünstige Technologie zur Implementierung eines vollständig reversiblen und steuerbaren Bahnunterwerks. Es besteht aus einem IGBT-Wechselrichter, der mit der Sekundärseite eines Bahnstromtransformators und einem Diodengleichrichter verbunden ist, und der Blindleistung einspeist, um die Ausgangsgleichspannung indirekt zu steuern. Nouveau concept de convertisseur pour sous-stations ferroviaires à courant continu réversible et régulé L’EFFICIENT BOOST de Sécheron est une technologie robuste, simple et abordable pour la mise en œuvre d’une sous-station de traction électrique entièrement réversible et contrôlée. Elle consiste en un onduleur IGBT connecté aux secondaires d’un transformateur redresseur à diodes, qui injecte de la puissance réactive pour contrôler indirectement la tension continue de sortie. 1 Introduction With increased efficiency requirements driven by rising energy costs and CO2 emission targets, controlled and reversible DC power traction substations are becoming more common. However, the market has not yet settled on a specific topology to achieve these functionalities. Ideally, the desired characteristics of a fully reversible traction substation are: • simple and robust • based on well-known technologies • good power factor in the MV network • cost effective • good return on investment Until now, the converter topologies available to achieve a controlled and fully reversible TPSS required the DC traction network operators to compromise on the characteristics above. The following solutions have been proposed up to date: • bidirectional PWM (pulse width modulation) converters based on IGBT [1] • double converters, including: – Thyristor rectifiers + inverters (based on IGBT or thyristor semiconductors) [2]. – Diode rectifiers + inverters (based on IGBT or thyristor semiconductors) [3]. Bi-directional IGBT converters are simple, achieve unity power factor in the MV network and the technology is now widespread, but they come at a steep cost and both rectification and inversion features are intrinsically merged, therefore the robustness is compromised. Mixed topologies, sometimes also called Double Converters, make use of thyristor or diode rectifiers for the rectification function and thyristor or IGBT inverters for the inversion function. In this case, the power factor and the simplicity of the system are degraded. However, by mixing a classic diode rectifier with a strategically connected IGBT inverter featuring special control functions, this new converter topology delivers the required bi-directional control functionality, without compromising any of the desired ideal characteristics of a TPSS, and with a reduced footprint. In this paper, the converter topology will be presented, the advantages will be described and the process that was followed to test and validate will be shown. eb 6 2024 ePaper Abonnement 2024 ã Georg Siemens Verlag GmbH & Co. KG Vervielfältigung und Verbreitung unzulässig und strafbar!