Abstract :
Multi-pulse gate turn-off thyristor based voltage source converter (GTO-VSC) topology having a number of 6-pulse VSCs as elementary unit together with fundamental frequency mode of GTO gate control are widely used in STATCOM for dynamic reactive power compensation in electrical network. A 12-pulse topology generally produces an AC output voltage waveforms which contain 11th, 13th, etc. harmonics and hardly find its application due to higher total harmonic distortion (THD) level. In this paper, a new model of 2-level, 12-pulse, 132 kV, plusmn100 MVAr STATCOM employing 2times6-pulse GTO-VSCs, fundamental frequency gate switching, PI-control methodology, DC capacitor as an energy storage and two stages of magnetics, is designed and simulated to attenuate harmonics of the order of 5th, 7th, 11 th, 13th etc. by SimPowerSystems toolbox in MATLAB environment. The operating performance of the compensator is studied for regulating voltage and power factor correction in electrical network and results show the model acceptable for power system applications
Keywords :
PI control; capacitor storage; fast Fourier transforms; harmonic distortion; harmonics suppression; mathematics computing; power conversion harmonics; power factor correction; power system simulation; power transformers; reactive power; static VAr compensators; thyristor convertors; voltage control; -100 to 100 MVAr; 12-pulse STATCOM; 132 kV; DC capacitor; GTO gate control; MATLAB; PI-control; SimPowerSystems toolbox; THD; dynamic reactive power compensation; electrical network; energy storage; fast Fourier transform; harmonics attenuation; multipulse gate turn-off thyristor; phase shifting transformer; power factor correction; power system application; total harmonic distortion; voltage regulation; voltage source converter; Automatic voltage control; Converters; Frequency conversion; Mathematical model; Network topology; Power conversion; Power system dynamics; Power system harmonics; Power system modeling; Thyristors;
