Optimization based real-time frequency dependent reduced order modeling of power grid

Abstract

Modeling of large power system for electromagnetic (EMT) simulation studies is impractical because of the complexity and computational burden. However, it is critical to preserve electromechanical oscillations and high frequency behavior of the system under consideration. Generally such designs can be achieved by modeling the area of interest (study area) in detail and the area not of interest (external area) as a combination of Transient Stability Analysis (TSA) type equivalent and Frequency Dependent Network Equivalent (FDNE). TSA preserves the electromechanical behavior, whereas FDNE preserves high frequency behavior of the external area. In this paper a method of formulating FDNE using stability and passivity enforced online optimization algorithm based on nonlinear programming, and modeling of external area as a combination of FDNE and TSA based wideband equivalent for EMT studies is proposed.