Abstract
The goal of this work is to calculate partial phase shift flows for each phase shifting transformer (PST). In opposite to the approach using phase shift distribution factors (PSDF)- and the Newton-Raphson power flow calculation with PSTs modelled as admittance, a new method is introduced where the AC solution is complemented by PSTs flows. Following this, this method allows to get full AC power flow result when summing up each partial flow. A partial power flow of each PST on each line is derivable with this new method. It is implemented by adding a PST current into the power equation. It is necessary to split PST Flows into their originators since they are flexible AC-transmission systems. The validation of this method is done by comparing the impact of a PSTs to recent methods like PSDF and modeling of PST as admittances. Additionally, two PSTs are integrated and the individual impacts of each PST on each line are calculated. The results show that the presented method can calculate Circular Flows for each PST, which is necessary to split remedial action costs to their originators. In opposite to DC PSDF method, no DC assumptions need to be taken.
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