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The value of large losses and poor voltage profiles are the main problems in the radial distribution system (RDS) in delivering electrical energy to customers. Go green is a consideration in an effort to maintain and improve system performance. The presence of Distributed Generation (DG) technology based on the utilization of new renewable energy is a new breakthrough that is utilized in supplying environmentally friendly electrical energy capable of reducing losses and increasing bus voltage levels by supplying active power to the system. This study tries to optimize the location and size of the DG using the K-Means Clustering method. The objective function is to reduce losses which are validated in the ULP Sungguminasa 165-bus RDS 20 kV electrical system based on the MATLAB programming. The simulation results show that from all existing scenarios, the placement of 3 DG units on buses 100, 123 and 36 with a total capacity of 8,601+j5,350 MW can reduce power losses by up to 89.13% or 278,529 kW and increase the bus voltage level with an average of 19.93 kV. [ABSTRACT FROM AUTHOR]

The continuity of electrical energy is inseparable from the reliability of the power system. In the event of a disruptive circumstance, the utilization of slack buses facilitates the transfer of functions from one primary source to another primary source. The Slack Bus is a solution aimed at mitigating the discrepancy between the load demand and the available producing capacity resulting from network losses. This study involved the simulation of the electric power system's operation by assigning the slack bus to three distinct locations, specifically bus-1 (Bakaru), bus-31 (Punagaya), and bus-37. The subject of discussion is Sengkang, a region in South Sulawesi. The simulation of the SULSELBAR 56-bus electrical system in the year 2022 was conducted using MATLAB 2013a software. The simulation results indicate that the smallest overall losses occur when Bus Sengkang is selected as the slack bus, with total losses amounting to 123.11 MW and 499.72 MVAr. [ABSTRACT FROM AUTHOR]