06 Electrical power supply and utilization (scientific, technical) this purpose were determined.
Controller gains, droop slopes, reference voltages and compensator ratings were found for maintaining the load nude voltages constant irrespective of system loadabilities to values which lead to voltage instabilities. Finally, the influence of system equivalent impedances on these parameters is discussed.
98/00381
Evaluation of the critical load increase direction in voltage collapse studies Bompard, E. et al. Electric Power Systems Research, 1997, 43, (1) 61-67. The problem of assessing the direction of minimum distance (MD) from the current operating point to the static critical boundary, describing the maximum loading conditions in the steady-state voltage collapse analysis. A high computational effort is needed to determine the exact calculation of the MD. Fast approximated criteria, based on computing the maximum sensitivities of total reactive generation or total losses with respect to the load increase factor, are illustrated and compared in the paper. The theoretical bases of these criteria are given in the case of a simple two-node system, discussing the possibility of approximating the critical load increase direction, especially when the operating point becomes close to the critical boundary. The authors discuss extending the above criteria to the analysis of larger power systems and applied to the standard IEEE 30-bus test system.