Showing papers by "Chen-Ching Liu published in 1995"
TL;DR: In this article, the authors identify features underlying restoration processes that are common to almost all utilities and that can serve as guides for preparing and evaluating restoration plans, for developing expert system programs that will be widely useful, and ultimately for improving the effectiveness of restoration practices.
Abstract: The results presented here reflect work, extending over several years, to identify features underlying restoration processes that are common to almost all utilities and that can serve as guides for preparing and evaluating restoration plans, for developing expert system programs that will be widely useful, and ultimately for improving the effectiveness of restoration practices. Generality is achieved by identifying constituent elements of the process, namely a "target system", "restoration building blocks (RBBs)", "generic restoration actions (GRAs)", and process constraints, and the factors that distinguish among three clearly demarcated stages. This distillation of the constituent elements of the restoration process provides a basis for development of a comprehensive, knowledge-based restoration expert system appropriate to a broad spectrum of power system utilities. >
200 citations
TL;DR: A tie line expert system module has also been developed to supplement the previously developed EPRI restoration expert system (RES), which can now include available tie line power in recommending a restoration strategy to maximize the system generation capability by modifying the generator startup sequence.
Abstract: This paper identifies some of the critical roles of tie lines during power system restoration. Based on these roles, a systematic approach is developed to evaluate the impact of the availability of tie line assistance on restoration. Using this approach, a tie line expert system module has also been developed to supplement the previously developed EPRI restoration expert system (RES). The enhanced RES can now include available tie line power in recommending a restoration strategy to maximize the system generation capability by modifying the generator startup sequence. Simulation results confirm that outside assistance will improve the overall generation capability and provide an extra dimension to the flexibility of a company's restoration strategy. >
30 citations
28 Sep 1995
TL;DR: A voltage controllability region is obtained for a dynamic, n-bus power system model and helps to determine if the trajectories of a large, dynamic power system can be fully controlled with the available control devices.
Abstract: This research is concerned with the power system voltage controllability issue. A voltage controllability region is obtained for a dynamic, n-bus power system model. The complete controllability region helps to determine if the trajectories of a large, dynamic power system can be fully controlled with the available control devices.
2 citations