An analytical approach for optimal size of distributed generation unit

This paper proposes an analytical method to calculate the optimal size for DG for minimizing the total power losses in distribution systems. This analytical expression is based on calculation of coefficient that linearly relates active and reactive power to voltage and angle. A Technique to get the optimal size is presented for DG capable of delivering real power. Besides, grid search algorithm method is also introduced. The DG unit is sized to achieve the highest loss reduction in distribution networks. This method is executed on a typical 22-bus and 58-bus test systems at three different load levels and yields efficiency in improvement of voltage profile and reduction of power losses. Results obtained from the proposed methodology are compared with that of the classical grid search algorithm. The results obtained are encouraging.