| Summary: | 碩士 === 國立成功大學 === 電機工程學系 === 85 ===
This thesis investigates the application of thyristor-controlled series capacitors (TCSC) and robust H∞ control theory on damping enhancement of subsynchronous torsional interactions of a power system containing series-capacitor compensation. The studied power system, i.e., the IEEE Second Benchmark Model, system-s, consists of two sets of nonidentical turbine-generators connected to an infinite bus through a common series-capacitor compensated line. Damping controllers employ shaft speed deviations of the studied generators as feedback signals to generate a damping signal in order to modulate the firing angle of TCSC's thyristors. Frequency-domain approach based on a linearized model and eigenvalue analysis is performed. Time-domain approach based on nonlinear model simulation under torque disturbances, a three-phase fault, and the variation of system operating point is also carried out. The proposed H∞ controller is also further reduced to a second order one for practical application by using order-reduction technique. The simulation results show that the designed H∞ controller can effectively suppress the subsynchronous resonance.
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