Design and Implementation of a 154-kV +/- 50-Mvar Transmission STATCOM Based on 21-Level Cascaded Multilevel Converter


Gultekin B., Gercek C. O. , Atalik T., Deniz M., Bicer N., ERMİŞ M. , et al.

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, cilt.48, ss.1030-1045, 2012 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 48 Konu: 3
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1109/tia.2012.2190690
  • Dergi Adı: IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
  • Sayfa Sayısı: ss.1030-1045

Özet

In this research work, the design and implementation of a 154-kV +/- 50-Mvar transmission static synchronous compensator (T-STATCOM) have been carried out primarily for the purposes of reactive power compensation and terminal voltage regulation and secondarily for power system stability. The implemented T-STATCOM consists of five 10.5-kV +/- 12-Mvar cascaded multilevel converter (CMC) modules operating in parallel. The power stage of each CMC is composed of five series-connected H-bridges (HBs) in each phase, thus resulting in 21-level line-to-line voltages. Due to modularity and flexibility of implemented HBs, each CMC module has reached a power density of 250 kvar/m(3), thus making the mobility of the system implementable. DC-link capacitor voltages of HBs are perfectly balanced by means of the modified selective swapping algorithm proposed. The field tests carried out at full load in the 154-kV transformer substation where T-STATCOM is installed have shown that the steady-state and transient responses of the system are quite satisfactory.