Generator Protection : Generator Monitoring Subsynchronous Resonance

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Generator Protection Subsynchronous Resonance Sokhom Sim Department of Electrical Engineering California State University, Long Beach Long Beach, CA 90840-8303 Abstract-the transmission lines are complex systems and the power generation sources are generally far away from the distributing center. The transmission lines congesting or overloading are always a challenge for utilities protection engineers. As a result, a series compensating capacitors are being used to alleviate the transmission lines, and increased the loads capability. However, adding series compensating capacitors (SCC) to the transmission lines will increase the potential risk of subsynchronous resonance (SSR). In fact, SSR leads to a possible torsional interaction and damage the turbine generator shaft when the mechanical frequency falls below the electrical frequency. In this paper, a brief analysis of SSR phenomenon will be addressed by computing the eigenvalues, eigenvectors, and MATLAB/Simulink for simulation incorporated with the IEEE first and second benchmark Model # 1 system. Keywords—Subsynchronous Resonance, Torsional oscillation, Series Compensating Capacitor, Transient Torque, generator induction effect. Introduction The growing demand of electricity in a large cities increase the need of high power transmission from remote generating stations. Therefore, for reducing the cost-effective in power transmission, series compensating capacitor (SSC) is used to

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