Eastern Long Island dynamic voltage stability

Hitherto, the voltage stability of the Long Island Power Authority (LIPA) system has been evaluated utilizing steady-state power flow programs. However, time domain simulations of LIPA system demonstrated significant differences in post-disturbance voltage recovery of transmission system voltages between models with static and complex load compositions. This is mainly due to the predominant residential loads in eastern Long Island, which is heavily dominated by motor loads. LIPA established transient voltage recovery criterion and proposed a dynamic reactive support system project to enhance the dynamic voltage stability of eastern Long Island. LIPA has been a pioneer in the Northeast in efforts to identify and address the conditions leading to fault-induced voltage collapse. This paper summarizes the identification of dynamic voltage stability issues, the need for reactive compensation to enhance the reliability of LIPA system and the call for industry wide time domain voltage stability assessments with dynamic load models.