Research On Multi Machine Power System Control Strategy Based On Hamilton Function

Nowadays,the harmonious development and progress of society,the national economic security are inextricably linked with the safe operation of the power system,both influence each other and complement each other,once the power grid instability will be on people's normal production and life have a huge impact.At present,China's power system has ushered in a new stage of development,which plays a decisive role in the economic development of the industry and plays an irreplaceable role in people's daily life.In this paper,the adaptive H_?control problem of multi-machine power system in the case of disturbances and uncertain parameters is discussed,based on Hamiltonian model.Considered the effect of time delay during control and transmission,a Hamilton model with control time delay is established.Lyapunov-Krasovskii function is selected,and a controller which makes the system asymptotically stable is got.The controller not only achieves the stability control for nonlinear systems with time delay,but also has the ability to suppress the external disturbances and adaptive ability to system parameter perturbation.The simulation results of the two machine power system test the effectiveness of the controller.Considering the problem of simultaneous stabilization of multi machine system in power system is becoming more and more prominent.In this paper,the H_?adaptive collaborative stabilization problem of doubly fed induction generator with both external disturbances and parameter uncertainty have been studied based on Hamilton function,and the closed-loop global stability and output synchronization of multi machine system are realized.Firstly,the Hamilton model of doubly fed induction generator is built,and expressed as dissipative Hamilton system by pre feedback.Then,external disturbances and parameter uncertainties are considered,and a controller which includes output feedback and synchronous adaptive interference suppression is designed,so that the wind generator units are kept running synchronous.The controller not only realizes the adaptive stability control of the nonlinear wind generator unit with parameter perturbation,but also has the ability to restrain the external disturbance.The effectiveness of the controller is tested by the simulation results of two wind generator units.