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This paper proposes and describes a high power factor AC-AC converter for naval applications using Permanent Magnet Generator (PMG). The three-phase output voltages of the PMG vary from 260 Vrms (220 Hz) to 380 Vrms (360 Hz), depending on load conditions. The proposed converter consists of a Y-Δ/Y power transformer, which provides electrical isolation between the PMG and remaining stages, and a twelve-pulse...
This paper addresses the control design for a three-stage solid stage transformer (SST). When two or more independently controlled converter stages are cascaded, which is the case for the three-stage SST, the interaction among the stages can lead to instability. Normally, the input and output impedances of the cascaded stages need to be examined according to the impedance criterion to ensure stability...
Power circuits used in prototype applications for flexible AC transmission systems (FACTS) have consisted of multiple three level or neutral point clamped power converters interfaced to the power system using transformer arrangements for improving waveform quality. This paper presents analytical modeling to determine semiconductor losses in such multi-pulse voltage source DC-AC converters used for...
Integrating various interface converters of small-rated distributed generators into the power system has become a promising solution to rapidly increasing demand of premium electric power. The output voltage of distributed generators, such as PVs, is usually so low that a low-frequency coupling transformer is required to place between the interface inverter and the grid for proper power delivery....
The distortion of an AC-DC converter current could be corrected by use of a fast-controlled impedance-matching transformer on a basis of a non-conducting converter with alternating of parallel and series resonance. The basics of the converter performance and operation are described. Changes in the converter input impedance can be eliminated by means of the varying transformation ratio. It is found...
The primary operating objective of mines is to optimize the cost per ton of material moved to remain profitable. In other words, this means moving the highest possible payload per hour while minimizing operating costs over the lifetime of the machines. Draglines remain a popular choice among other excavation machines because of their high productivity and low cost per unit moved. Siemens provides...
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