| Summary: | 碩士 === 高苑科技大學 === 電子工程研究所 === 98 === Single-pole switching scheme is widely used in the EHV (Extra
High Voltage) system. However, the substantial negative current injected
to the turbine-generators imposes the electromagnetic torque of double
system- frequency components during the periods from the single-pole
trip to the reclosing. Thus, a series of torsional impact due to a ‘faultsingle-
pole- clearing-reclosing’ accident induces the problems associated
with torque amplification and lots of fatigue life loss in turbine blades.
For the nearby generators, it is necessary to develop a scheme to alleviate
blade vibration torques. This project proposes the design of a mechanical
filter associated with double-system frequency against such an super
synchronous resonance. Eventually, the author implement devise the
torsional vibration simulator based on FPGA chips, which has the
simplicity and the ability to forecast transient turbine vibration behaviors.
This can demonstrate the effectiveness of the proposed scheme.
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