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Several technical power system architectures are being evaluated for the Navy's next generation all-electric warship. One concept being considered includes a scheme to power both port and starboard busses from a single generator with dual-windings. This approach offers redundancy and reduces the effects of prime mover light loading, but it inherently couples the two busses through the common generator...
The article contains a mathematical description of the asynchronous generator under asymmetric switching loads with non-linearity of magnetization characteristics. Mathematical models allow one to evaluate the actual generator properties without add experiments and to obtain information on such issues as: determination of generator operating characteristics in a wide range of load with symmetric and...
This paper introduces a new transformerless converter topology for Multiphase-Based Wind Energy Conversion Systems (WECSs). In this topology, a twelve-phase induction generator is integrated to the grid using dual Nine-Switch Converters (NSCs) connected in series forming a high voltage cascaded dc-link. For this generator phase number, this topology reduces the total number of semiconductor devices...
The article considers one variant for solving problem of development high-efficiency power converters for hybrid and electric vehicles, wind turbines and micro hydroelectric power stations. The results of designing high-efficiency power converters with power electronic converters and Squirrel-Cage Induction Generators (SCIGs), which have compact front parts due to specific winding, are given. These...
This paper introduces a fast parameter identification technique for a two-order d-q model of a synchronous generator from Standstill Frequency Response (SSFR) tests. This identification method is based on a modified SSFR test and the curves of the no-load and sustained short-circuit tests. This allows the lowest SSFR frequency to be 0.01Hz instead of 0.001Hz. The phase and field resistances are measured...
This paper presents a scalar volt per hertz (v/f) control technique for maximum power tracking of a grid-connected wind-driven Brushless Doubly-Fed Reluctance Generator (BDFRG). The proposed generator has two stator windings namely; power winding, directly connected to the grid, and control winding, connected to the grid through a bi-directional converter. The presented control technique is based...
This work presents different methods of analyzing a large hydro generator with computational fluid dynamics, respectively two transient and two steady-state approaches. It also shows the evaluation of a new modelling method compared to the state-of-the-art pole sector models. The focus is on the end winding area and the influence of different ventilation schemes on heat transfer and fluid flow. The...
The paper presents a study of a six-phase wind energy conversion system (WECS) with series-connected dc-links. The structure of the generation system requires the dc-link voltages to be balanced at the generator's side. To achieve this, it is shown that a dc-link voltage balancing controller can be realised by exploiting the extra degrees of freedom provided by the xy plane of the six-phase machine...
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