文档介绍：兰州交通大学毕业设计（论文）
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A MODULAR DESIGN OF ASYNCHRONOUS TRACTION DRIVE
G Crawshaw, C J Yarrow, B J Cardwell
BRUSH EL交通大学毕业设计（论文）
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The interfaces between functions and to the system bus are via dual port memory ().
CONTROL ELECTRONICS STRUCTURE
The whole of the microprocessor rack system is contained in plug in modules of a shielded metal construction, in such a way as to provide a screened enclosure for noise immunity. All signals going in and out of the micro- system are filtered to stop conducted noise. Signal conditioning is performed outside the screened enclosure using normal analogue electronic techniques. The fast signals needed for power circuit switching are taken directly out of the micro-system using fibre optic links.
Most of the software is written in Pascal, a structured high level language, producing good readable code and easier program documentation as well as ease of modularization and design. All software is produced under vigorous quality assurance procedures, equivalent to SIL 2 for railway applications.
Supervisory System
As well as generally controlling the inverter system operation, the supervisory system contains the interfaces necessary to condition the power control to the vehicle requirements and provides brake blending. Load weighing, notch regression and speed limit controls. All of these software modules may he tailored to suit any particular customer specification.
兰州交通大学毕业设计（论文）
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The diagnostic system is also incorporated at Supervisor level and handles all the diagnostic information built into each part of the system. It determines the action to be taken as a result of fault reports and provides communication to the vehicle system or to other data links as required.
Torque Control
The torque controller provides inverter frequency control without the need for any speed measurement, although a simple speed measurement is used to speed up the resynchronization (re-motoring) process. The syste