Phase II: Frequency Domain Analysis of Low-Frequency Oscillations in Large Electric Power Systems. Volume 1. Basic Concepts, Mathematical Models, and Computing Methods. Final Report

摘要

When major electric power systems are interconnected through ties of relatively small capacity, low-frequency intersystem oscillations are likely to be troublesome for some operating conditions. Spontaneous intersystem oscillations which have occurred in the western and north central states attest to this aspect of system behavior. The long distances which separate concentrations of generating capacity in those systems also separate many individual generating plants from other machines; so that localized, poorly damped, higher frequency modes of oscillation also exist. The potential for unstable oscillations must be considered in planning the bulk generation and transmission system, in designing control systems for turbine-generators and dc line terminals, and in system operations. Present practice depends almost entirely on time-domain simulation for large system analysis, with computing costs that are relatively high and information in a form which is often not well suited to study purposes. The objective of this research is to develop an alternative to time-domain simulation for damping studies. This alternative involves the use of a linearized system model for calculating the natural frequencies and damping factors of oscillations between generator rotors. (ERA citation 08:023434)