Chapter 25
Perspectives and Future Directions
25.1 CURRENT DEVELOPMENTS
After decades of research and development in energy function-based direct methods, it has become clear that the capabilities of the controlling unstable equilibrium point (controlling UEP) method and those of the time–domain simulation approach complement each other. The current direction of development is to incorporate the BCU-based controlling UEP method and time–domain simulation programs into the body of overall online transient stability assessments (TSAs) (Chiang et al., 1995, 2007; Chiang 1999; Ernst et al., 2001; IEEE Committee Report, 1988; Kaye and Wu, 1982; Morison et al., 2004; Tada et al., 2002; Yu et al., 2002). Online TSA is designed to provide power system operators with critical information including the following:
1. assessment of the transient stability of a power system subject to a list of contingencies and
2. available (power) transfer limits at key interfaces subject to transient stability constraints.
An integrated architecture for online TSA and control is presented in Figure 25.1. In this architecture, there are two major components in the module of online TSA: fast, dynamic contingency screening and a time–domain stability program for performing detailed stability analysis. When a new cycle of online TSA is warranted, a list of credible contingencies, along with information from the state estimator and topological analysis, is applied to the dynamic contingency screening program ...
