Optimal location and coordinated voltage control for distributed generators in distribution networks

Distributed Generators (DGs) connected to distribution networks are growing in popularity and as a feasible way to reduce environmental impacts in energy production. However, despite the multiple benefits that DG brings to the network, improper planning and operation of DG may lead to negative impacts into distribution networks. Increment in power losses, voltage instability, and deficient operation of control equipment are three of the main impacts that DG may bring to system. In order to revert the negative impacts of DG, this study proposes a method to find the optimal location and size of new DG units, reducing the power losses and enhancing the voltage profile. Also a coordinated voltage control method is presented in order to find the optimal setting for active and reactive power from DG, in coordination with the on-load tap changer (OLTC) and shunt capacitors (SCs). This study presents the multiobjective problem for both methods solved using a genetic algorithm (GA) technique. The proposed methods are tested with unbalance distribution networks. Additionally, the use of a time varying load and generation profile are considered.