Abstract
In this paper an attempt has been made to point out the basic differences between an `impedance based' controllable series compensation (CSC) and a static synchronous series compensator (SSSC), which is based on power electronic converters with GTO thyristors . First, basic theoretical considerations regarding power flow control in the transmission line using CSC and SSSC respectively, were studied, applying the mathematical model. Results clarified basic differences between CSC and SSSC regarding this question and showed that SSSC is superior to CSC in the area of low transmission angles (short lines or low-loaded lines). The time-domain simulation using a detailed SSSC simulation model confirmed theoretical considerations. For this purpose, a decoupled control structure with a predictive control loop based on the transformation of the three-phase system to the rotating reference frame was developed. On the test system, which may be found in various countries, the differences between CSC and SSSC regarding power oscillation damping were demonstrated. Results showed that under specific conditions, SSSC can be much more effective than CSC.
Published Version
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