A NEW DECENTRALIZED NONLINEAR VOLTAGE CONTROLLER FOR MULTIMACHINE POWER-SYSTEMS

A new decentralized nonlinear voltage controller for multimachine powe r systems is proposed in this paper. The nonlinear n-machine power sys tem model is first linearized and decoupled over the whole operating r egion by using the direct feedback linearization (DFL) technique. Then a decentralized nonlinear voltage controller is developed by use of t he robust control theory. Performance of the proposed controller in a three-machine example system is simulated. The simulation results show that both voltage regulation and system stability enhancement can be achieved with this proposed controller regardless of the system operat ing conditions.