TABLE OF CONTENTS With the recent practical applications of converter based FACTS-devices such as the Static Synchronous Compensator (STATCOM) [26], Static Synchronous Series Compensator (SSSC) [27] and Unified Power How Controller (UPFC) [28], modeling and analysis of these FACTS-devices in power system operation and control is of great interest. In [24] mathematical models of the SSSC suitable for three-phase power flow analysis have been investigated.
In comparison to positive sequence model of SSSC, the three-phase SSSC models should consider:
The differences between three-phase and positive sequence SSSC models. The three-phase SSSC models are basically different from the positive sequence SSSC models, which are able to give realistic results of power system operation with presence of unbalances of networks and loads while the positive sequence SSSC models can provide meaningful results only if both networks and loads are balanced.
The transformer connection types. In the three-phase SSSC models, it is necessary to consider how the SSSC is connected with the transformer while, in the positive sequence SSSC models for conventional power flow calculations, such considerations are not needed.
The similarity between three-phase models and positive sequence models. In principle, the three-phase models should be identical to the positive sequence models when both networks and loads are balanced.
Fig. 5.2 shows the basic operation principles of a three-phase SSSC. The SSSC consists of three converters, which are series connected with a three-phase...
