Load Flow Models for the Static Var Compensator Distribution D-SVC

During the last decade power system have been equipped with complex components such as Distribution Static Var Compensators (D-SVCs). These components have introduced new possibilities to control power systems, D-SVCs can almost continuously change the amount of reactive power from capacitor banks. The behavior of these new components is different from 'old' technologies since they contain power electronics and detailed representations of them are non-linear. Due to their complexity they are difficult also to simulate. When studying power systems including such components, the analyzer must decide whether it is necessary to include a detailed model of them or not, i.e. to represent each event that takes place, or ignore them. In this paper, the load flow models for the static Var compensator distribution (D-SVC) are presented. These models are incorporated into existing load flow harmonic (LFH). The models of the D-SVC are based instead on the variable shunt susceptance concept. The DSVC state variables are combined with the bus voltage magnitudes and angles of the network. Two examples are examined in the principal content of this paper; both of them contain nonlinear loads. Conclusion is made concerning the application of harmonic power flow studies. Key-Words: Static Var compensator in distribution (D-SVC), load flow harmonic (LFH), conventional load flow (CLF), fundamental load flow (FLF), harmonic.