Paper presents modified topology of the Vienna rectifier which has been applied in DC traction substation. Modification consists of replacing a pair of diodes with a pair of thyristors in each single-phase rectifier module. Fully-controlled rectifiers that consist of transistors are becoming more popular, also in traction applications. PWM rectifier, in comparison to the diode-or thyristor-based rectifiers, has higher power losses and its costs are higher. Proposed topology of the rectifier has got less number of transistors so the costs can be reduced. A 1,5 MW modified Vienna rectifier has been tested in computer simulation software. Streszczenie. Artykuł przedstawia zmodyfikowany prostownik Vienna, który został wykorzystany w podstacji sieci trakcyjnej prądu stałego. Modyfikacja polega na zastąpieniu pary diod parą tyrystorów w każdym z jednofazowych modułów prostownika. W pełni sterowane prostowniki są coraz częściej wykorzystywane również w aplikacjach trakcyjnych. W porównaniu do prostowników diodowych lub tyrystorowych, prostownik PWM charakteryzuje się większymi stratami mocy oraz kosztami. Przedstawiona topologia prostownika składa się z mniejszej liczby tranzystorów co umożliwia zmniejszenie kosztów. Zmodyfikowany prostownik Vienna o mocy 1,5 MW został przetestowany z użyciem środowiska symulacyjnego. (Trójfazowy prostownik dedykowany do podstacji trakcyjnej sieci DC).
Summary
Typical diesel engine‐based, autonomous electrical power supply system includes a diesel engine, a permanent magnet generator, and an AC/DC/AC converter. The main contribution of this paper is to obtain low fuel consumption by selecting the operating speed range of a diesel engine. The second goal is to present performance of the variable speed generation system equipped in a power electronic converter. Several problems are combined, such as strategy of speed control, operating speed range selection, boost rectifier operating range, autonomous parallel operation of two generating sets, and connection and disconnection process of generating sets. Laboratory tests of two 15 kVA generating sets, including parallel operation, were carried out.
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