Three-Phase Distribution Power Flow Solution Considering Symmetrical and Unsymmetrical Three-Phase Voltage Control Mode of PV Nodes
The Distributed Generators (DGs) which are operated as PV generators can be controlled in symmetrical and unsymmetrical three-phase voltage control mode. This paper presents an unbalanced three-phase backward/forward power flow solution which can handle PV nodes in both modes. The proposed algorithm is based on the power summation method and takes the power losses into account. Moreover, a mathematical formula is extracted for calculating the power losses considering the mutual coupling between three phases. Active and reactive powers are used as flow variables; therefore checking the limits of reactive power of the generator of PV node is performed in a simple and straightforward manner. The proposed algorithm for a single source distribution system is validated by testing on IEEE four-node test feeder. The results of applying proposed algorithm on a modified IEEE 34-node test feeder show the capability of the algorithm in handling PV nodes in both control modes.
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