Performance Evalution of Indirect Control Technique for STATCOM

Modern electric power system is very complex network of synchronous generators, transmission lines and loads mainly inductive type loads. The characteristics of the system vary with changes in load and generation schedules. Electric utilities first grew as isolated systems, and then gradually neighboring utilities began to join forming highly interconnected systems. This enabled the utilities to draw on each other‟s generation reserves during the time of need. The overall reliability has improved through interconnection but disturbances in such systems propagate through, leading to system instability and possible black-outs.A good power system should possess the ability to regain its normal operating condition after a disturbance. Since ability to supply uninterrupted electricity determines the quality of electric power supplied to the load, stability is regarded as one of the important topics of power system research. Power system stability can be improved using FACTS controllers by enhancing its steady-state and transient stability or by damping the sub-synchronous resonance oscillations.in this paper an important FACTS devics STATCOM is proposed. For proper controlling of reactive power compensation indirect controlling is proposed.