Steady-state and transient performances of Oman transmission system with 200 MW photovoltaic power plant

The paper presents steady-state and transient studies to assess the impact of a 200 MW Photovoltaic Power plant (PVPP) connection on the Main Interconnected Transmission System (MITS) of Oman. The PVPP consists mainly of a large number of solar arrays, DC/DC converters, DC/AC inverters, filters, and step-up transformers. Two proposed locations are considered to connect the PVPP plant to MITS: Manah 132 kV and Adam 132/33 kV grid stations in Al-Dakhiliah region. The transmission grid model of 2016 has been updated to include the simulation of the proposed 200 MW PVPP at either Manah or Adam. The DIgSILENT PowerFactory professional software is used to simulate the system and to obtain the results. The results include percentage of transmission line loadings, percentage of transformer loadings, busbar voltages, grid losses, in addition to 3-phase and 1-phase fault levels. Also, simulation studies have been performed to assess the transmission system transient responses to the PVPP outage. Steady state and transient analyses have shown that the connection of the PVPP plant at Manah or Adam to the transmission system is acceptable. The transient responses have proved that the system remains stable when it is subjected to the PVPP forced outage.