Cost based reactive power participation for voltage control in multi units based isolated hybrid power system

Multi units of wind and diesel based generators in isolated hybrid power system have technical and operational advantages over single units system. They require dynamic reactive power compensation for fast recovery of voltage under load and input changes. In developing countries like India, investors' prime concern is to provide continuous electricity at low rate while quality degradation can be permitted within pre defined acceptable range. The use of static compensator along with dynamic compensator may give cost effective reactive power participation for system. This paper presented pricing of reactive power compensation under steady state and transient conditions of system with fixed capacitor and STATCOM. The main contributions of the paper are; (i) evaluating reactive power balance equation for generalized multi units of wind and diesel based isolated hybrid power system, (ii) reactive power compensation using fixed capacitor and STATCOM in presence of composite load model, (ii) fast recovery of voltage response using genetic algorithm based tuning of STATCOM controller, (iii) evaluation of reactive power compensation cost for steady and dynamic conditions due to probabilistic change in load and/or input demand and (iv) comparison of results with existing reference compensation method.