Simultaneously placement and sizing of multiple DGs and shunt capacitor banks in unbalanced distribution systems using real coded GA

The allocation of local active and reactive power in distribution systems is very important to meet customer demand and maintain the quality of electrical energy. Power loss and voltage deviation can be minimized by placing Distributed Generations (DGs) or Shunt Capacitor Banks (SCBs) in the right places and with the appropriate size. This paper discusses simultaneously placement and sizing of multiple DGs and SCBs in unbalanced distribution systems for power loss and voltage deviation reduction while maintaining harmonics at the IEEE-519 standard limit. Real Coded Genetic Algorithm (RCGA) is employed to determine the location and size of SCBs and DGs. The proposed method is applied on Modified Kaliasin radial distribution systems. The results show that the placement of the DGs on the bus 7, 8, 9, 10 is the most powerful results in reducing losses and voltage deviation compared to the other scheme. Placement 4 DGs with the size of each is 135 kW reduce the active power losses of 35.80% and the reactive power of 35.81%. The minimum bus voltage before and after placement DGs are 19.906 kV and 19.928 kV respectively.