Multivariable Feedback Linearization Scheme for New Excitation Systems Based on Full Controlled Devices

Excitation system based on full controlled devices converter,with the ability of ordinary excitation system,can also supply more damping to the synchronous generator and increase the stability of power system through injecting reactive current to the grid.But as the incensement of variables and the change of the system structure,the whole system becomes more complicated and it is harder to design the control scheme.For this complicated nonlinear system,this paper first proved that compensating reactive power in grid side is equivalent to compensating shunt impendence.Based on this conclusion,this paper deduced a third-order model of this kind of excitation system.And with the main goal of controlling the rotor angle as well as the terminal voltage,a MIMO nonlinear control strategy was designed based on this model.The simulation results show that,compared with the linear control scheme(AVR+PSS),this nonlinear scheme is more effective in enhancing the system’s damping,and better effect can be achieved with the compensation capacity increasing;even if system parameters are changed,the good performance and better suitability can be maintained.