  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.
