Title :
Mitigation of subsynchronous oscillations by 48-pulse VSC STATCOM using remote signal
Author :
Salemnia, A. ; Khederzadeh, M. ; Ghorbani, A.
Author_Institution :
Electr. Dept. Eng., Power & Water Univ. of Technol., Tehran, Iran
Abstract :
Series compensated power system may lead to a very unusual problem known as Subsynchronous Resonance (SSR). Flexible AC Transmission Systems (FACTS) controllers are widely applied to mitigate subsynchronous oscillations. The Static Synchronous Compensator (STATCOM) is a shunt device of the FACTS family using power electronics to control power flow and improve transient stability on power grids. With the advent of Wide Area Measurement (WAM) technology, it is possible to measure the states of a large interconnected power system with synchronized Phasor Measurement Units (PMU). In this paper the concept of using remote signals acquired through PMU has been proposed to damp SSR. An auxiliary subsynchronous damping controller (SSDC) for a STATCOM using the remote accelerating power of generator signal as the stabilizing signal has been designed to damp subsynchronous oscillations. This paper deals with a cascaded multilevel converter model, which is a 48-pulse (three levels) source converter. The voltage source converter described in this paper is a harmonic neutralized, 48-pulse GTO converter. The IEEE Second Benchmark (SBM) model is considered for the analysis and the complete digital simulation of the STATCOM within the power system is performed in the MATLAB/Simulink environment using the Power System Blockset (PSB).
Keywords :
damping; flexible AC transmission systems; load flow control; oscillations; phase measurement; power convertors; power system interconnection; power system measurement; power transmission control; static VAr compensators; subsynchronous resonance; 48-pulse GTO converter; 48-pulse VSC STATCOM; 48-pulse source converter; FACTS controllers; IEEE second benchmark model; MATLAB/Simulink environment; PMU; auxiliary subsynchronous damping controller; cascaded multilevel converter model; flexible AC transmission systems controllers; generator signal; large interconnected power system; power electronics; power flow control; power grids; power system blockset; remote accelerating power; remote signal; remote signals; series compensated power system; static synchronous compensator; subsynchronous oscillations mitigation; subsynchronous resonance; synchronized phasor measurement units; wide area measurement technology; Automatic voltage control; Flexible AC transmission systems; Mathematical model; Phasor measurement units; Power system analysis computing; Power system harmonics; Power system interconnection; Power system modeling; Power system stability; Power system transients; 48-pulse Gate Turn-Off (GTO) thyristor model STATCOM; Flexible AC Transmission Systems (FACTS); Phasor Measurement Unit (PMU); Subsynchronous Damping Controller (SSDC); Subsynchronous Resonance (SSR); Wide Area Measurement (WAM);
Conference_Titel :
PowerTech, 2009 IEEE Bucharest
Conference_Location :
Bucharest
Print_ISBN :
978-1-4244-2234-0
Electronic_ISBN :
978-1-4244-2235-7
DOI :
10.1109/PTC.2009.5282202