Admissible Region of Large-Scale Uncertain Wind Generation Considering Small-Signal Stability of Power System

TL;DR

This paper introduces the admissible region of uncertain wind generation (SSAR) to evaluate how much wind power variability a power system can handle without losing small-signal stability, aiding stability assessment amid increasing wind integration.

Contribution

It develops a novel conceptual framework and the SSAR metric to quantify the impact of uncertain wind injections on power system stability, extending traditional stability regions.

Findings

SSAR effectively measures wind variability tolerance.

Case studies demonstrate SSAR's practical application.

Framework aids stability assessment with high wind uncertainty.

Abstract

The increasing integration of wind generation has brought great challenges to small-signal stability analysis of bulk power systems, since the volatility and uncertainty nature of wind generation may considerably affect equilibriums of the systems. In this regard, this paper develops a conceptual framework to depict the influence of uncertain wind power injections (WPIs) on small-signal stability of bulk power systems. To do this, a new concept, the admissible region of uncertain wind generation considering small-signal stability (SSAR) is introduced to geometrically measure how much uncertain wind generation can be accommodated by a bulk power system without breaking its small-signal stability. As a generalization of the traditional concept of the small-signal stability region (SSSR), SSAR is derived by extending the SSSR to a higher-dimensional injection space that incorporates both the conventional nodal generation injections and the WPIs, and then mapping it onto the lower-dimensional WPI space. Case studies on the modified New England 39-bus system with multiple wind farms illustrate the SSAR concept and its potential applications.