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Nearly all electric vehicles (EVs), hybrid electric vehicles (HEVs), more electric aircraft, electric ship propulsion and others power conversion industrial applications uses power electronic inverters to convert AC to DC or vis versa, as in the starter/generator machine system and generation/regeneration process of the traction motor. Also, it has become possible to integrate HEVs power electronics...
Electric vehicles (EV's) are a gradually growing field for electric traction machines due to energy and environmental related constraints [1, 2]. The traction system of an EV consists of an electric traction machine (TM), power conversion electronics and energy source(s). The energy source(s) provide a DC link supply for the traction system. The impact on the electric traction machine design from...
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...
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...
This Paper focuses on Westcode Semiconductors' advanced high power devices; Diodes, Thyristors and Press-Pack IGBTs. Westcode, a division of IXYS Corporation, manufacture devices for use on many power sub-assemblies and have been meeting the strenuous demands of various applications within traction and energy markets. Electrical system performance is calculated using conventional methodology together...
An adjustable high voltage active load circuit for voltage amplitudes above 100 volts, especially intended for resistive matching the output impedance of a piezoelectric transformer (PT) is proposed in this paper. PTs have been around for over 50 years, were C. A. Rosen is common known for his famous Rosen type design back in the 1950s [1]. After the discovered of new piezoelectric materials and new...
This paper suggests a unique configuration of certain standard inverters to give better performance from medium and high speed Linear Induction Motors (LIMs). It extends the control method suggested for low speed LIMs [1] and allows a given system parameter to be optimised.
Soft switching for power factor collection (PFC) of high-end server power supply unit (PSU) is studied. FET loss of PFC circuit is caused by Ron-related loss and switching loss. The switching loss consists of switching-speed-related part and output capacitance (Coss)-related part. The switching-speed related-part can be reduced by using a high-speed FET and high-power gate driver; however, Coss-related...
The Electronic Flight Guarding System (FGS) is a completely new system that implements electronic circuit breakers, switches and motor drivers to distribute the whole electric power to all electric loads in light and sport-aircraft. The circuit breaker function is done in hardware to avoid hazardous situations in case of a software failure. The current and other analogue and digital signals are monitored,...
Linear synchronous motors can be used for large scale electromagnetic launch. The machines are short time rated and can therefore use substantial values of stator current loading. This leads to high values of armature flux and the risk of demagnetising the excitation magnets. In order to mitigate this risk by reducing the armature flux, quadrature axis flux barriers can be positioned in the permanent...
In this paper, Particle Swarm Optimization (PSO) is employed to size and locate Distributed Generation (DG) in a distribution network to provide a more effective loss reduction and voltage support. Unlike most previous studies, DG nodes are modelled as generator (PV) nodes in this study. Three network scenarios are considered: a network with no generation but with reactive power compensation capacitors,...
This paper presents design and analysis of direct drive field winding wind generators. The power of salient pole synchronous wind generators is 660 (kW) with 28.5 (rpm). Rotor is skewed to reduce the torque oscillations. Magnetic analysis of wind generators is done using finite element method. Temperatures of wind generator structure are analyzed using numerical thermal calculations. Finally a direct...
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...
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...
A discrete control design of a single phase PFC boost converter with FPGA is presented. The average current mode control (with current reference) and Self Control (without current reference) are analyzed when implemented with discrete hardware controller. Simulation and experimental results are shown to verify the performance of both controllers.
The application of predictive current control to a multilevel converter is investigated in an aerospace starter-generator system. The use of a multilevel inverter with predictive current control enables the system to reduce the harmonic distortion in the current waveform when compared to a conventional Field Orientated Controller. It is important that the power converter is optimized to control the...
Multilevel drive supply can be realised in two different ways, by using either a conventional multilevel single-sided supply configuration or with a dual-inverter supply topology. The second structure is simpler for practical realisation, since the problem of capacitor voltage balancing does not arise. This paper develops a space vector PWM (SVPWM) algorithm for the dual-inverter six-phase supply,...
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