Simple robust adaptive control of static VAR compensator

A study of power system transient stability enhancement through effective use of static VAR compensator is presented. It is shown that optimal state-variable control can be approximately realized as a simple closed-loop control based on locally measurable electric quantities. In order to make this regulation more effective and insensitive to the changes of the network parameters and loading condition it is proposed to use simple adaptive control with dynamic gain tuned by additional control loops. Tests done for two-machine and multi-machine systems have confirmed the validity and robustness of the proposed control method.