A comprehensive approach for subsynchronous resonance screening analysis using frequency scanning technique

The paper presents a comprehensive approach for subsynchronous resonance (SSR) screening analysis using a developed frequency scanning tool capable of handling power networks with hundreds of buses. PTI´s software packages like PSS/E and IPLAN programs were used for the development of the SSR tool. The frequency scanning technique scans for the subsynchronous frequency range between 5 Hz to 59 Hz to determine the system driving point impedance (as a function of frequency) viewed from the neutral point of the generating unit under study. The proposed approach was applied to analyze the SSR phenomenon on several steam and gas driven turbine-generator plants in the northern part of the Western System Coordinating Council (WSCC) control area where several 500 kV-transmission lines include series capacitor compensation. As a part of the study, credible contingencies that may lead to a network topology susceptible to SSR phenomenon are identified for proposed plants considered in the study.