Reduction of NRPG System with Preservation of Dominant Inter-Area Mode for Its Easy Control

This paper studies the model order reduction (MOR) of large scale system i.e. Northern Regional Power Grid (NRPG) system of India so that the design of damping control becomes less complex. The linearized NRPG system is obtained in power system toolbox (PST) to carry out the MOR study. The eigenvalue analysis is conducted for a full order system to obtain the characteristics and behavior of inter-area modes and the controller location is also identified for dominant inter-area mode. The MOR is done with a target on preserving the characteristics and behavior of dominant inter-area mode in reduced order model (ROM). For verifying the same characteristics and behavior of desired mode in ROM, four aspects are considered which are, mode characteristics, modal observability, model controllability, and step response. The recently upgraded application of MATLAB called “model reducer” app is utilized to reduce the full order system of NRPG.