Pchd Doubly Fed Induction Generator-based L2 Gain Control

Wind power is one of the most important Green energy, in the energy crisis and growing environmental pollution situation, the wind power technology is an unprecedented paid close attention. In this paper, the main content is the operation control of doubly-fed induction generator (DFIG) which is usually used in the variable-speed-constant-frequency VSCF wind power system, Applying the Hamiltonian system theory and methods of L2-gain disturbances attenuation, the DFIG wind power system controller is designed, and the Stability of system is analyze. At the same time the design for the system is simulated in the Matlab/Simulink software simulation environment, The simulation results show that the largest wind energy capture as well as Independent reactive power regulation is achieved. It has a certain reference value for engineering application, has certain reference value.The main issues in this paper are focused on:Firstly, A PCH control method and L2 disturbance attenuation of the theoretical basis are introduced and the PCHD model of non-linear system is given.Secondly, Established the DFIG dynamic mathematical model in different coordinates system, and constructed and built up a PCH structure of the DFIG. established the wind turbines VSCF wind power system model which are Constructed by the DFIG, bi-directional power converter. And the described the super-synchrony and sub-synchrony operation of DFIG (electric power state and power state) and the relationship between the energy flows.Thirdly, under the DFIG mathematical model which is in the form of PCHD structure, using the state error PCHD control theory and the principle of L2 disturbance attenuation, designed the PCH controller and L2 controller gain of the variable speed constant frequency wind power generation system, and finally the total system controller is given.Fourthly, introduced the voltage space vector pulse width modulation (SVPWM) principle and studied achievement of the voltage space vector pulse width modulation (SVPWM)of the transmission system. And give the simulation for the DFIG wind power system in the Matlab/Simulink environment. The simulation results show that the method is feasible.Finally, the research work of this article is summarized; some study methods and future research directions of the system are put forwards.