Design of a power-electronic protection device for a direct-on-line brushless excitation synchronous machine
Antoniuk, Aleksei (2019)
Diplomityö
2019
School of Energy Systems, Sähkötekniikka
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2019072323184
https://urn.fi/URN:NBN:fi-fe2019072323184
Tiivistelmä
The graduation paper deals with a design of an overvoltage protection device for a synchronous machine with brushless excitation. The synchronous machine system comprises a 5 MVA salient-pole main synchronous motor, an outer-pole synchronous auxiliary excitation machine and a rotating diode bridge, placed on the shaft.
The main goal is to produce a reliable, autonomous and efficient overvoltage protection device that protects both the field winding of the main machine and the rotating diode bridge from excessive voltage induced in the field winding of the main machine during Direct On Line (DOL) start.
The main method of the design is modelling and simulation of the main synchronous machine, protection device and their interaction in MatLab Simulink computing environment.
As a result, a parametrized model for an overvoltage protection device is produced and its proper functioning is proven to sufficient degree. The model is simplified at some degree and a number of issues remain unsolved, such as gate circuitry and discretization issues.
The main goal is to produce a reliable, autonomous and efficient overvoltage protection device that protects both the field winding of the main machine and the rotating diode bridge from excessive voltage induced in the field winding of the main machine during Direct On Line (DOL) start.
The main method of the design is modelling and simulation of the main synchronous machine, protection device and their interaction in MatLab Simulink computing environment.
As a result, a parametrized model for an overvoltage protection device is produced and its proper functioning is proven to sufficient degree. The model is simplified at some degree and a number of issues remain unsolved, such as gate circuitry and discretization issues.