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Control Systems for Switched Reluctance and Permanent Magnet Machines in Advanced Vehicular Electric Networks

Fernando, Weeramundage Udaya Nuwantha

[Thesis]. Manchester, UK: The University of Manchester; 2012.

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Abstract

This thesis presents the design and analysis of specialised control systems for switched reluctance (SR) and permanent magnet (PM) machines in vehicular electric applications. Control systems for operation in motoring and power generation are considered for both the types of machines. The SR machine operation considered in this thesis is mainly focused towards the application of aero-engine starter/generators. The control designs for PM machines are formulated considering general fault-tolerant and isolated multiphase PM machines which can be applied in the majority of safety-critical vehicular power and propulsion applications.The SR motoring mode presented in this thesis considers the control design for operation from zero speed to a high speed range, while SR generation mode is confined to the high speed range, such as for the requirements of aero-engine starter/generator operation. This thesis investigates applied control methods for both single-pulse and chopping modes of operation. Classical excitation control versus peak current control and the introduction of a zero-voltage interval are compared for SR motor operation. Optimized excitation control versus two classical forms of excitation control are developed and compared for SR generator operation. Studies include simulation of a 12/8 250kW machine and experimental work on a 6/4 300W machine.The PM motoring and power generation considered in this thesis focuses on a special class of PM machines and drives which are specifically designed for fault-tolerant operation. Optimized control strategies for the operation of PM machines with the parallel H-bridge per-phase converter architecture are investigated. Mathematical modelling of the machine and drive with a consideration of harmonics is presented. The developed control methods are then evaluated by means of finite-element model based simulations of a 125kW five phase surface PM rotor machine and an interior PM rotor machine.

Additional content not available electronically

Description of digital materials not submitted on-line:Figures associated with the appendices G to T are submitted separately in PDF format. These figures present additional simulation results performed as part of the research. SR motor drive simulation results associated with appendices G and H, SR generator simulation results associated with appendices I, J and K, PM motor drive simulation results associated with appendices N, M, O and P, and PM generator simulation results associated with appendices Q, R, S and T are presented in these figures.