Multi-objective optimization for voltage regulation in distribution systems with distributed generators

In this study, in order to reduce the abnormal voltage drop or rise in the distribution systems with distributed generators, we consider a multi-objective function to be optimized in such a way that the voltage profile is enhanced while the total active power loss in the network is minimized under some operational constraints. Capacitors and static VAR compensators are also coordinated with the distributed generators in the network to acquire a better enhancement in the voltage profile. The purpose of this study is to obtain the optimum sizes and locations of these system components so that the active power losses and the deviations in bus voltages from their nominal values are minimized. The problem is formulated as a multi-objective optimization problem and solved by the goal attainment method. The studies are demonstrated on an IEEE 34-bus test system where the direct load flow method is utilized for load flow calculations.