Design of microcontroller based simulator for open and closed loop control system of steam turbine

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Dr. Tamus Zoltán Ádám
Department of Electric Power Engineering

This document is a thesis plan, which describes the planning, implementing and testing steps of a programmable device, which is connected with a turbine control system. Important fact, that the device, which forms the theme of the thesis is applicable for different tasks according to the implemented software, however because of the current practical demands the software is implemented for the test method of a turbine control system.

In the introduction chapter, the reader gets a short, but comprehensive picture about nowadays turbine project implementation steps, especially about the difficulty of the test method of a turbine control cabinet.

The first chapter of the document details the basics of the implemented device. The SPI protocol, which executes the expand of the microcontroller based system with its role in the system is detailed here. After that analog transfer circuits are detailed, what transfer signals from the microcontroller signal level to the industrial signal level and the same transformation in the other direction. The most frequent used industrial signal types are included between the realized and tested signal types, they are: digital input, digital output, analog 4-20 mA input, analog 4-20 mA output and there is a proposed implementation also for RTD input simulation.

The second chapter details the the operation of the test device as a system. The modular system is described by its elements. Because of the lack of the time only 3 signal types were implemented as interface modules from the frequent used signal types mentioned in the previous chapter, they are: digital input module, digital output module, analog 4-20 mA input module. After this, the thesis is details the structure of the realized modules with their assigned embedded program sections, they make these modules suitable for manage multiple simulator channels. Then the main embedded software is detailed, which runs on the central element of the system, furthermore serial messages are specified in details through which the device is reachable from any kind of computer application.

The third chapter describes shortly the PC software, which communicates with the test device with the previous mentioned serial messages.


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