Estimation of Sub-synchronous Resonance Risk in Thermal Power Plants due to the Nearby Installation of TCSC

JIITA, vol.4 no.1, p.332-340, 2020, DOI: 10.22664/ISITA.2020.4.1.332

Minh-Chau Dinh1), Minh-Quan Tran2), Jae-In Lee3), Minwon Park3,*), Jongsu Yoon4)
1) Institute of Mechatronics, Changwon National University, Changwon, Korea
2) Dept. of Electrical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands
3) Dept. of Electrical Engineering, Changwon National University, Changwon, Korea
4) Korea Electric Power Research Institute, Daejeon, Korea

Abstract: Korea Electric Power Corporation (KEPCO) is installing Thyristor Controlled Series Capacitors (TCSCs) on 345 kV transmission lines in their system. With the first installation of TCSCs, the operating characteristics of the surrounding power system should be analyzed in advance, especially the subsynchronous resonance (SSR) problem. This paper deals with the SSR analysis in the thermal power plant due to the installation of TCSC in a nearby transmission line. Through the mechanical modeling, we investigated the mechanical properties of the most affected thermal power plants by the TCSCs such as mode shape, natural frequency, and damping time constant, etc., . We used the most direct method for determining the SSR by examining the damping of torsional mode. All analysis was done by using PSCAD/EMTDC and MATLAB programs. The simulation results show that the installation of TCSCs in Korea power network has no risk of SSR in the nearby thermal power plant.

Keyword: Korea power network; thermal power plant; SSR; TCSC


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