Date(s) - 19 Feb 2020
1:10 PM - 2:00 PM
3043 ECpE Building Addition
Speaker: Alok Kumar Bharati, ECpE Graduate Student
Adviser: Venkataramana Ajjarapu
Title: Role of T&D Interactions in Long Term Voltage Stability Margin Assessment
Abstract: This graduate seminar emphasizes the importance of including unbalanced distribution systems for voltage stability studies in power systems. The talk aims to: discuss the various simulation methods for power system analysis; highlight the need for modeling unbalanced distribution system for accurate load margin assessment; demonstrate the influence of net-load unbalance (NLU) on voltage stability margin (VSM). The distribution system is evolving rapidly with high proliferation of distributed energy resources (DERs); these are not guaranteed to proliferate in a balanced manner and uncertainty resulting due to these DERs is well acknowledged. These uncertainties cannot be captured or visualized without representing the distribution system in detail along with the transmission system. I will demonstrate the impact of proliferation of DERs in various 3-phase proportions on voltage stability margin through T&D co-simulation (performed with commercial solvers) and also study the impact of volt/VAR control on voltage stability margin. This analysis is only possible by representing the distribution system in detail through T&D co-simulation. Higher percentage of net-load unbalance (NLU) in distribution system aggravates the voltage stability margin of the distribution system, which can further negatively influence the overall voltage stability margin of the system.