Benefits of economy transactions and wheeling in Canada

As part of a review of possible measures for increasing inter-utility cooperation and enhancing transmission access in Canada, the National Energy Board carried out a study to quantify some potential wheeling benefits. Computer simulations were performed, incorporating a planning time horizon and real system data, to determine potential benefits from bilateral exchanges of economy energy and the additional benefits which could result from various wheeling arrangements. From these simulations, the potential benefits for each system involved as well as the net potential benefits for the region were determined. The CPU time for the simulations ranged from 14 hours to 46 hours on a VAX 8200 mini computer. Sensitivity analyses were also performed to establish the dependency of the benefits obtained on some system parameters used in the studies     

Incorporation of voltage stability operating limits in compositesystem adequacy assessment: BC Hydro's experience

This paper presents an approach for incorporating actual voltage stability operating limits (VSOL) in the composite power system adequacy evaluation. The VSOL curves are fitted into simplex-type straight lines and added in the linear programming model for minimizing load curtailment as additional constraints. The incorporated voltage stability limits are those calculated for the operators in the power system control center. The introduction of the actual limits therefore leads to adequacy evaluation closer to the operation reality with very little overhead since the voltage stability operating limits are pre-calculated for system operation. The case studies for BC Hydro's 500/230 kV system are given and discussed     

Generator On-Line State Estimation and Optimal Control: Laboratory Implementation and Prospects for Development

Many academic papers have suggested the use of multivariable optimal control to improve generator stability but implementations only appear to have been made in the laboratory with model machines. After a brief discussion of the principles of control and estimation results are shown for a successful laboratory implementation. The further possibilities for improving control are outlined and the problems of application to multi-machine systems are discussed. Emphasis is given to the logic of the approach rather than mathematical detail which is given elsewhere.