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In standalone dc system, dc-dc converter is used to interconnect solar photovoltaic (pv) and battery. To utilize solar pv to fullest, maximum power point tracking (MPPT) is incorporated in controller. However, in case when the state of charge (SoC) of battery is high and system is partially loaded, excess power flows into the battery, thereby reducing the life of battery. Technique suggested in literature...
The reliability of press-fit connectors of IGBT modules was investigated. No change in contact resistance between press-fit pins and PCB vias was found after active thermal cycling, vibration and corrosion, similar to [1,2]. However, the press-out forces after active thermal cycling have been reduced by ∼30%. In addition to chemical tin, also the cheaper Hot Air Levelling (HAL) was used as PCB finish...
Tidal stream energy is seen as one of the most viable and clean energy sources in future. This paper describes the research on a cost effective tidal stream power generation system in which a group of 3-phase synchronous generators operating at diverse speeds are connected to a common DC bus via passive diode rectifiers. This power conversion and collection configuration reduce the amount of components...
In this paper, resonant inverters for induction heating are developed for domestic applications. The design is based on half and full bridge single phase inverter of 1 and 4 kW rating. First, the power circuits of the two topologies are analyzed using computer aided design based on Simplorer package. Then, an experimental system was built and tested using microcontroller chip (PiccoloTMS320F28027)...
This paper is part of a project which aims to research the opportunities for the re-use of batteries after their primary use in low and ultra low carbon vehicles on the electricity grid system. One potential revenue stream is to provide primary/secondary/high frequency response to National Grid through market mechanisms via DNO's or Energy service providers. Some commercial battery energy storage...
This paper presents the results of a technical feasibility study concerning the direct-drive conversion of an existing four-axis wire processing machine. The objective is to obtain a considerable efficiency improvement, while maintaining equal speed and angle synchronization properties as the substituted gearbox mechanics. A control algorithm based on the method of ‘electronic line shafting’ is implemented...
Power quality disturbances like voltage sags and harmonics are an important cause of many ill effects and economic losses in industrial productive processes. Among others problems, production down times, equipment malfunctions and/or destruction of devices and even quality defects in final products can be originated by voltage dips. Power quality surveys and electromechanical device testing are previous...
Double-conversion UPS are often the preferred choice for protecting critical loads, the typical example being IT equipment in data centres. While providing optimum protection, double-conversion UPS only provide limited efficiency. Some UPS feature a high-efficiency operating mode (so-called ECO mode) where the load is fed via the bypass path. Particularly, some Advanced ECO mode implementations combine...
This paper gives details of an ongoing collaborative project in the area of automotive traction drive machine design. The relationship between electrical frequency, torque, pole number and iron loss in modulated pole machines is investigated with respect to fulfilling an industrially relevant specification. A number of alternative topology configurations are simulated, presented and discussed.
In September 1995, a project was initiated to replace the existing drive line at NASA's most unique transonic wind tunnel, the National Transonic Facility (NTF), with a single 101 MW synchronous motor driven by a Load Commutated Inverter (LCI). This Adjustable Speed Drive (ASD) system also included a custom four-winding transformer, harmonic filter, exciter, switchgear, control system, and feeder...
Permanent magnet synchronous motors (PMSM) are used in a great variety of applications such as: electric toys, electric tools, medical/chemical industries, centrifuges at high speed, vehicle applications (motor starters), robot applications etc. All these have in common small size, high energy density, increased torque for a large speed range, high dynamics when high inertia is present. In consequence,...
Power Electronics Interfaces (PEIs) play an increasingly important role in the future automotive technology. This paper proposes a novel power electronics interface (PEI) to interface multiple energy sources such as Fuel Cells (FC), Batteries and Supercapacitors to the powertrain of fuel cell hybrid electric vehicles (FCHEV). The proposed PEI is responsible for the power-flow management on-board the...
This paper presents an experimental method for measuring heat generation rate in the permanent magnets of rotating electrical machines. The results obtained from the experimental work are used to derive an empirical correlation which is subsequently used to predict the total thermal energy stored in a magnet after a speed varying torque load. The results of an uncertainty analysis are offered in order...
This paper presents the electromagnetic topology selection and thermal analysis of a liquid-cooled high speed surface-mount permanent magnet electrical synchronous machine (SM-PMSM), with a power density exceeding 30MW/m3 using thermal resistance networks. The parametric thermal models that have been developed cater for the axial temperature distribution in the machine while operating at speeds of...
A dedicated four-quadrant regenerative experimental test rig was built to perform various tests on a 15-phase Active Stator machine and its associated drive system. Machine no-load characteristics were investigated and a number of on-load tests were conducted for both motoring and generating modes of operations. The machine stator winding commutating inductance was calculated using voltage and current...
This paper presents a novel method for the torque capability maximization of the synchronous reluctance machine. The macroscopic parameters d- and q-axis insulation ratios, kwq and kwd, respectively, are introduced. They describe fully the geometry characteristic of the p-pole pair, two barrier rotor. The presented combined analytical-FEM approach gives the optimal distribution of air and iron for...
A novel 450 kW DC wind power generator has been built using Active Stator technology, with an integrated oil immersed power electronic converter. The converter utilises unpackaged series connected Reverse Blocking Gate Commutated Thyristors (RB-GCT), operating at unity gain, to achieve high power density within a sealed ‘i-CAN’ stack enclosure. The stack is cooled with synthetic ester oil which is...
Power-converters or amplifiers are required to drive highpower piezoelectric transducers and attached processing equipment, at the optimum resonance mode for best processing efficacy, while under varying loading conditions. The driving power converter must synthesize relatively low-distortion sinusoidal output current to prevent harmonic-current excitation of neighbouring, less-productive or desirable...
This paper describes a PMSM traction motor with novel rotor structure for high speed rail vehicles. A nonmagnetic shaft sleeve is introduced in the design to reduce the flux leakage. The non-uniform air gap is adopted and optimized to provide sinusoidal flux linkage and back EMF. FEM simulations have been carried out to verify the design. The mechanical stress of the rotor and the thermal dissipation...
This paper presents a comparative study of electromagnetic performance in switched flux permanent magnet (SFPM) machines with different topologies, i.e. conventional SFPM machines, multi-tooth, E-core and C-core SFPM machines. With the aid of 2D finite element analysis (FEA), the torque waveform, cogging torque, back-emf and d- and q-axis inductances are investigated and compared with emphasis on...
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