Power oscillation damping control for inter-area mode in reduced order model

Abstract

This chapter presents the study on design of local power system stabilizers (PSS) for the northern regional power grid (NRPG) system of India to control the oscillation due to least damped inter-area mode. First, eigenvalue analysis is conducted on linearized model of the NRPG system to obtain the properties of inter-area modes. The location of PSS in the network is suggested by applying residue technique. The power-voltage reference (PVr) characteristic of suggested generator is used to design the compensating block of local PSS. In order to make the PSS tuning fast after installation, the reduced order model (ROM) for the NRPG system is obtained. The same ROM has also been utilized in the initial design of local PSS by considering it in the tuning process of PSS-gain. The model order reduction (MOR) is performed with a target on preserving the important properties of the desired mode in ROM as good as possible. Validation of mode preservation in ROM is done by matching four information associated with the desired mode i.e. mode characteristics, modal observability, model controllability, and step response. Two local PSSs are designed for G44 and G15 of the NRPG system and their performance is investigated. © The Institution of Engineering and Technology 2023.