Application of Gate-Controlled Series Capacitors (GCSC) for Reducing Stresses due to Sub-Synchronous Resonance in Turbine-Generator Shaft

Abstract

The main purpose of this paper is to verify the capability of the gate controlled series capacitor (GCSC) to mitigate subsynchronous resonance (SSR) and electromechanical oscillations that occur when a steam turbinegenerator (T-G) is connected to a long transmission line with series compensation. SSR develops the stresses at the coupling of T–G set .This investigation was done based on the IEEE First Benchmark Model. Turn-off pulse generator with zero crossing detectors is used for GCSC. By using turn-off pulse generator capacitive reactance of transmission line can be controlled and hence SSR is mitigated. The Matlab simulink is employed to simulate the effect on stresses of T-G shaft. The simulations results show how the stresses on T-G shaft reduce with the application of GCSC. Index Terms Capacitor compensated transmission lines, power generation mechanical factors, power system dynamic stability, power system modeling, subsynchronous resonance, thyristor applications, turbo generators. I. NOMENCLATURE Tmi = mechanical toque of i mass, N-m. Tei = electrical toque of i mass, N-m. Mi = inertia of i mass, N-m. Hi = inertia constant of i mass, MW.sec/MVA δ i = deviation angle of i mass, electrical radians. Kij = spring co-efficient between i & j mass, pu torque/electrical radian. dij =damping co-efficient between i & j mass, pu torque/pu speed deviation. ωi = speed of i mass, electrical radians/ second. Fij= stress in the shaft between i & j mass, N/m. G = modulus of rigidity, N/m. L = length of shaft, m. R = radius of shaft, m.

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Cite this paper

@inproceedings{Umre2010ApplicationOG, title={Application of Gate-Controlled Series Capacitors (GCSC) for Reducing Stresses due to Sub-Synchronous Resonance in Turbine-Generator Shaft}, author={Bhimrao S. Umre and J. B. Helonde and J. P. Modak and Sonali Renkey}, year={2010} }