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

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14 Author(s)
Gultekin, B. ; Middle East Tech. Univ., Ankara, Turkey ; Gercek, C.O. ; Atalik, T. ; Deniz, M.
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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/m3, 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.

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Industry Applications, IEEE Transactions on  (Volume:48 ,  Issue: 3 )