A concept of Robust Power System Security and its application under renewable energy sources penetration

Penetration of large amount of renewable energy sources (RES) may introduce considerable uncertainties in power systems making difficult the planning and operation tasks. This paper proposes a new concept named “Robust Power System Security (RS)” in order to investigate power system security in the presence of uncertainties. RS region is defined as an area of power system operation in which the system is secure regardless of uncertainties in parameters such as RES outputs. When the size of the uncertainties is specified, RS region is identified. It is observed that the region tends to shrink and disappear as the uncertainty increases. Emerging problems concerned with security issues in future power systems are investigated. Simulations under large RES penetration are carried out using a three generators test system. Possible applications of the proposed concept toward real-time operation problems are discussed for keeping up the security.