Total transfer capability computation using small signa stability-based security constrained optimal power flowz

摘要

In an open transmission access environment, the system operating conditions tend to be pushed close to thenstability limits. Small signal stability, commonly in the form of low frequency oscillations, is considered tonbe a crucial factor since it limits the amount of power transfer through interconnected transmission linesnunder severe disturbances. This paper presents a novel approach to the assessment of the total transferncapability (TTC) using small signal stability-based security constrained optimal power flow (SSS-SCOPF),nthereby enhancing small signal sense under a set of credible contingencies while maximizing power transfer.nThe eigenvalue perturbation method is used to derive the small signal stability constraint included in SSS-nSCOPF, which is a linear inequality expressed in terms of the control parameters. In order to reduce thencomputational burden, Bender’s decomposition method is applied to partition the TTC problem with thensmall signal stability constraint into an iterative two-stage mathematical programming problem. It is thennsolved by the primal-dual interior point method (PDIPM) in a master-sub problem iteration manner until nonconstraint violation occurs for each contingency. The effectiveness of the proposed method is clearlynvalidated by comparison with the conventional optimal power flow (OPF) and SCOPF under the same arraynof transactions, base case, and line outages for the New England 39-bus system. Copyright # 2010 JohnnWiley & Sons, Ltd.