Nonlinear Predictive Control Design Of The Generator

It is very important for the operating security of a power system and the national economics to improve and enhance the stability of the power system. The excitation control and valve control of synchronous generator are effective measures in improving stability of power system, so it has been being investigated for a long time that how to apply these developing effective control theories to generator control by many scholars. Researchers have done many works and obtained many achievements, but there still have many questions must to be done. In this paper, applying the predictive control theory to the generator control, a new nonlinear predictive control law is proposed.The main works and the studying achievements are follows: the research productions in the excitation control and valve control of generator are introduced; the developments and actuality are summarized; the questions of control design for the generator are analyzed. Aiming at the questions, on the basis of Model Algorithmic Control the paper presented a ecumenical common nonlinear predictive control law which is based on Taylor progression in theory, and the nonlinear predictive control law based on Taylor progression(TMAC) has acquired. In the further research, aiming at the limitation of Taylor progression and the object of enlarge information, similarly, on the basis of Model Algorithmic Control, the paper presented the nonlinear predictive control law which is base on Adams predictive (AMAC). Aiming at SISO nonlinear control system, and on the condition of Single-machine infinite-bus power system, the above-mentioned control laws are applied to design the excitation control for torque-synchronous generator and valve control for condensing turbine generator in Single-machine infinite-bus power system, similarly, considering the specialty of the Adams predictive method, terminal voltage deviation ? Ut,the linear combination of terminal voltage deviation ?ωand its differential coefficient ?ω& are selected as output functions, then nonlinear predictive excitation control and valve control laws based on Taylor progression and Adams predictive method are acquired. Finally, the laws are compared and it could be proved that the AMAC has better control effect than TMAC, the output characteristics of the generator are improved, the stability of the power system are enhanced.