Abstract
With high penetration of renewables based distributed generation (DG) sources, several issues such as voltage instability and increased power losses arise. Such issues can be effectively mitigated with the usage of battery energy storage systems (BESSs) that act as buffer and absorb/inject necessary active power. Besides BESSs, reactive power availability of DG converters can also be utilized simultaneously, so as to reduce stress on the BESSs. In this paper, we propose a fully distributed strategy to minimize power losses in the grid and power losses while charging/discharging the BESSs, by optimizing active power from/to BESSs and reactive power from DG converters. A differential grid model is developed, using which the DGs and their corresponding BESSs perform a gradient based approach in a distributed manner to optimally change their outputs. Simulation studies performed on modified IEEE 30-bus test system show that the proposed algorithm effectively optimizes the grid under dynamic conditions.
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