Optimal allocation of distributed generation in radial distribution network for voltage stability improvement and power loss minimization

Voltage instability and power loss are significant problems in distribution networks (DN). However, these problems are usually mitigated by the optimal integration of distributed generation (DG) units in the DN. In this regard, the optimal location and size of the DGs are crucial. Otherwise, network performance will deteriorate. This study is conducted to placemat and sizing the DGs in the radial DN. Mayfly Algorithm (MA) is used to determine the optimal placement and size of the DGs to minimize power loss, increases voltage stability in radial DN. The simulation results showed a reduction in the percentage of power loss is 69.14% for three PV-type DG unit integration. The corresponding percentage of power loss reduction is 98.09 % for three WT-type DG units by installing DG units to the test network. Similarly, the minimum bus voltage stability improves to 0.959 per unit for three PV type DG unit integration. The VSI after DG allocation increases to 0.989 per unit for three WT type DG units by optimal installing DG units. Comparative studies have been conducted, and the results have shown the effectiveness of the proposed method in reducing the power loss and improving the voltage stability of the DN. The proposed algorithm is evaluated in the IEEE-69 bus radial DN using MATLAB.