Voltage stability index-based reactive power compensation scheme

Reports of various committees set up to review the 2003 North American major power outages pointed out that a major exacerbating factor has been lack of situational awareness by power system operators. To improve reactive power compensation and contribute to the mitigation of power outages associated with the present near-limit operated commercialized grid, a bus voltage stability (BVS) index based reactive power compensation scheme has been developed. BVS index is a hybrid voltage stability computation model involving the two machine modeled L-index and a complex power ΠΠ-transmission line structure modeled Ls-index developed by the authors. The current regional wheeling of power across transmission distance far beyond the two machine model has necessitated the development of a novel Ls-index model suitable for long lines. The composite scheme was then incorporated into Newton–Raphson’s (N–R) power flow which encompasses multiple shunt devices (multi-shunt). This arrangement provided a knowledge based system for power system monitoring. Results obtained from applying the developed models and schemes in the IEEE 300 bus system with zoning and under varying operating conditions showed the system’s capability to provide improved system monitoring and optimal compensation based on availability.