Study Of Control Method For Auto Disturbance Rejection Of DFIG's Parameters In VSCF Wind Power Generating System

Variable-speed constant-frequency (VSCF) doubly-fed wind-power is a new highefficient technology for power generation, which has a good future in the field ofwind power generation. In general, the doubly-fed induction generator(DFIG) iscontrolled by field-oriented vector control method, which strictly depends on DFIG'sparameters. When the parameters are disturbing or unknown, the control performancewill be highly affected. This dissertation imports auto disturbance rejectioncontroller(ADRC) and combines with oriented-vector control principle to improvecutting-in control method with no load and active-reactive decoupled power controlmethod. Without DFIG parameters, the improved method can also abtain excellentdynamic and static performance. The dissertation firstly introduces the DFIG's fundamental, analyses its mathematicmodel, equivalent circuit and control characteristics. Then systematically introducesthe fundamental and design method of ADRC, including its developments and basicideas, the principal and the design method of three basic components-T-D, nonlinearstate error feedback, ESO;then combines vector control with ADRC, improves thecutting-in control method with no load and active-reactive power control method, putsforward a control method for auto disturbance rejection of DFIG's parameters. Aimed at an 110KVA DFIG of the laboratory, this dissertation builds up asimulating mode under Matlab6.5/Simulink platform and designs a controller withoutDFIG parameters. The simulating results indicate that the control system has a fastresponse rate without overshoot, no static error and gains an excellent robustperformance.