A Coordinated Optimization Model for Solar Photovoltaic Integrated DC Distribution Networks

Solar photovoltaic (PV) systems will drive deep electrification of energy systems leading to clean energy 2050. However, connecting large amounts of solar on DC networks used in solar farms and possible future DC distribution systems would lead to over voltages, resulting in loss of solar power. Further, solar PV systems operate exclusively using maximum power point tracking algorithms, without coordinating with the remainder of the network. This thesis presents a coordinated optimization model to optimally control the settings of voltage controllers (DC-DC converters), placed at the outputs of solar PV systems and selected distribution lines, while maximizing solar power output and minimizing substation power. The proposed formulation was tested on several systems and compared to an uncoordinated situation. The results demonstrate an increase in solar power of 60.06%, in the 28-bus case. The proposed method will be an excellent tool enabling deep electrification using solar PV systems, overcoming limitations of uncoordinated systems.