New passivity design for the excitation and steam-valving control of synchronous generators

This paper presents a new passivity design for the excitation and steam-valving control of synchronous generators. Different from conventional control method, the proposed control considers the steady-state error of active power and reactive power supporting capability of the generator. Based on the five-order nonlinear model with two inputs, steam-valving control is designed by backstepping method at first to ensure the angle stability, and then excitation control is achieved by using the passivity approach incorporating the high side voltage control technique. When design the controller, two integrators are added in the differential equations to reduce the steady-state error. And the step up transformer reactance is compensated in design, so the excitation control is optimized to sustain a high level voltage. The simulation shows the approach has strong positive impact on the performance of active and reactive power of the generator.