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This paper analyses the operation of a variable-speed wound-field synchronous generator (WFSG) connected to a constant-voltage dc-system. The challenges for the operation under variable speed and constant voltage and the need for a dc-dc converter to adjust the stator side voltage are pointed out. The boost converter introduces a degree of freedom which can be used to optimize the WFSG efficiency...
Future transportation systems for aircraft, vehicles or marine vessels are all candidates for redesigned propulsion systems as a result of the more-electric revolution. Accurately emulating these new propulsion system designs to assess the dynamic engine-generator-electrical system interactions will be an invaluable design tool. A HIL mechanical emulation system is presented which utilises a novel...
Physically derived mathematical models of motors are frequently used to simulate system performance. These can be constructed at various levels of fidelity depending on the application requirements. To accurately capture the dynamics of brushless permanent magnet motors, the effects of electrical commutation should be included. Short time-step simulations are required to include electrical effects...
The impact of time delays on emulation systems is examined through a simulation model of an aircraft power system demonstrator facility. The aircraft demonstrator uses hardware-in-the-loop (HIL) techniques to command two motor drives so they emulate the dynamic characteristics of the shafts in an aircraft gas-engine. Time delay effects are inherent in HIL test systems using industrial control platforms...
The paper discusses the development and validation of motor simulation models to aid in the design of actuators for use with automotive variable geometry turbochargers. The specific focus is on the benefit of increasing the fidelity of the motor model, against the tradeoff of increased complexity. Several separate models of the same brushless permanent magnet motor are developed and validated against...
This paper reports an investigation into the influence of inter-bar currents on the performance of die-cast cage induction machines. The work is based on an extensive set of experimental measurements using a series of specially made die-cast cage induction motors with bars insulated using alternate processes. The observations arising from the test results are reinforced by predictions made using an...
By providing a common power supply to both the propulsion and service loads on ships, integrated full electric propulsion (IFEP) offers benefits of increased design flexibility and reduced running costs. Whilst presenting power system challenges commonly seen in land based grid systems, the prevalence of power electronics, high power density, and the significance of individual loads (such as propulsion...
This paper reports on the simulation of a marine Integrated Electric Full Electric Propulsion (IFEP) system to assess its ability to absorb variations in propulsion or auxiliary load without excessive degradation of the electrical supply quality or imposing excessive demands on the prime movers. IFEP systems are expected to yield economic benefits to ship operators by permitting the capacity of ship...
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