Voltage Stability Analysis on Transmission Grid Interconnected to Solar Photovoltaic

Humans depend on electricity, which is also a major contributor to a nation's economic development and to fulfill the needs, a reliable power system is very important. In achieving carbon free electricity, many countries started to implement utility scale solar photovoltaic (PV) into the transmission level. However, due to the ‘must take’ characteristics of solar PV output, it brings technical challenges and have a significant impact on system stability. Voltage stability is the ability of a power system network to maintain its reliable operation based on the safety operation across all network buses both during normal operation and during contingencies. The impact of solar PV energy as a source of network disturbance is the main issue of this study. Voltage Stability Indices (VSI) is used to identify the system's weakest point and the voltage stability for each line is measured using Line Stability Factor (LQP). All the simulation works is done using Power System Simulator for Engineering (PSS/E) and the IEEE 30-bus is used as the test system. The results present the impact of each solar PV penetration to the voltage stability and show the impact of solar PV penetration to the thermal loading percentage.