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This paper investigates the influence of pole number and stator outer diameter on the performance of superconducting (SC) generators. The SC generator has an iron-cored rotor topology. First, the generator structure is introduced and the optimization procedure is described. Then, the influence of design parameters on performance, in terms of generator volume, weight, SC wire utilization, active material...
This paper proposes a vector-control (power-winding flux orientation) strategy for maximum wind-power extraction of a grid-connected wind-driven Brushless Doubly-Fed Reluctance Generator (BDFRG) system. The adopted 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. In addition, a unity...
A Flywheel Energy Storage (FES) system consists of a rectifier, dc link, a bi-directional converter (BDC) connecting the dc link to a Brush-less DC (BLDC) machine coupled to a flywheel. The BLDC machine which is used in an FES system is one of the critical sub systems. This machine acts as a motor when energy is being stored in the flywheel and as a generator when the same energy is being harvested...
This paper presents the transient behavior of a recently introduced configuration of a single-phase induction generator (IG) which employs a three-phase squirrel cage induction machine. One of the three windings of the machine is used for excitation control and active power control using a bidirectional power converter. The other two windings connected in series form the generator output to which...
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...
The aerospace trend is towards the More Electric Aircraft (MEA), which consists in the progressive electrification of the main on-board systems and services. The resulting increase of the aircraft electrical loading involves significant implications for on-board electrical generation systems, realizing the so-called More Electric Engine (MEE). In the MEE concept the electrical generators are integrated...
This paper reports on the control necessary in a Bristol cylinder sea-wave energy capture device and the issues concerned with harvesting a slow, propagating sea-wave, where the power will pulsate. In the paper a detailed description is put forward for the mechanical system. The control strategies necessary to control a system that is has continuously changing conditions are outlined and simulations...
This paper presents a comparative study of PMAC machine candidates for starter-generator application in hybrid bus with series powertrain configuration. PMAC machines with interior and surface mount permanent magnets are considered and compared, although a complete analysis is only carried out for the SPM. Different design aspects such as: concentrated versus distributed windings as well as interior...
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