Voltage Stability Constrained Real and Reactive Power Optimization

Abstract

Active and reactive power rescheduling has been an important problem for satisfactory operation of power system. Adequate operation involves security as well as economics.Usually active power rescheduling involves MW-generations rescheduling so as to have minimum operating cost subjected to satisfaction of line flow constraints. Reactive power rescheduling is adopted so as to have adequate level of VSM and desired voltage profile. Under moderate loading condition active and reactive problems are solved separately but at times under stressed condition simultaneous rescheduling of active power as well as reactive power control variables is required to account coupling effect. MW- generation rescheduling is executed to enhance voltage stability when reactive power control variables are exhausted.Thesis describes a new methodology for load rejection at buses incorporating the effect of distributed generation (DG) at selected buses. The strategy provides load rejection amount at important buses in anticipation for the predicted load in the next interval. secure and correctively secure status provides safe operating conditions. Violations of operating constraints e.g. bus voltage magnitudes, line flows and VSM are alleviated using active and reactive power rescheduling. This thesis Presents following aspects: (1)An optimal reactive power dispatch technique for voltage stability enhancement employing Jaya optimization technique. Result obtained on an IEEE-30 test bus system have been compared with those obtained using SFLA and PSO technique. newline(2) A technique for reactive power reserve optimization accounting constraint on voltage stability margin employing Jaya, TLBO and CAPSO algorithms. Algorithms have been implemented on 14- bus and 30- bus test system. newline(3) Black Hole algorithm for voltage stability enhancement by MW-generation rescheduling using minimum eigen value as proximity indicator. Algorithm has been implemented on 14-bus test system. Results have been compared with those obtained using TLBO and PSO. newline