Solving Optimal Reactive Power Dispatch Problem Considering Load Uncertainty

Abstract

The aim of the Optimal Reactive Power Dispatch (ORPD) solution is assigning the most confident operating point for optimal secure and operation state. The required operating point that will be determined by ORPD solution include generators voltage, transformers tap, Var compensators output for minimizing the power losses and improving the voltage profile. It is well-known that the load demand in system changes hourly and seasonally. Thus, the load variation is a source of uncertainty in power system planning. This paper solves the ORPD problem with considering uncertainties in load demand using the enhanced grey wolf optimizer (EGWO). The EGWO technique is developed to enhance the exploration and exploration capabilities of the basic grey wolf optimizer (GWO). The EGWO is based on Levy flight distribution with adaptive operators to avoid the stagnation of the traditional GWO. The EGWO is tested on IEEE 30-bus system with and without considering the uncertainty of load demand and the obtained results are compared with those captured by the traditional GWO. The results show the effectiveness of EGWO for solving the ORPD problem in terms of decreasing power losses and enhancing voltage profile.