The Designing And The Researchment On Doubly-fed Wind Generation Control System Based With The Miscroprocessor

Wind power is a reproducible energy source which has a brilliant future. As the source crisis goes seriously, wind power is widely used. Compared to the traditional wind power generation methods, the variable-speed constant-frequency technology has the advantages of high efficiency and quality. In practical applications the effect of grid-connection control takes an important significance while the traditional mode of grid-connection control can not satisfy the grid-connection control requirements of doubly-fed generator. Based on this point, this paper puts forwards a new excitation-control method of grid-connection with no load and designs a new excitation-controller of synchronization grid-connection with no-load in doubly-fed motor to do some experimental research.The theoretical analysis and the experimental research work for doubly-fed wind power excitation control system are carried out more comprehensively. Based on the analysis of the principle of the wind power generation and doubly-fed asynchronous generator, by using vector transformation and coordinate transformation technique, doubly-fed electrical power generation system in the two-phase static coordinate system based on the mathematical models and stator flux directional synchronous rotation coordinates of the dynamic model were worked out , and based on the mathematical model created, the frequency and amplitude of the closed-loop PI-conditioned doubly-fed generator and the empty net control strategy was proposed in this paper, which makes the system can keep track of the changes of the information for the grid when the wind speed changes. The synchronization network control strategy for the doubly-fed motor was analyzed and studied, and the fine-tuning the frequency of terminal voltage regulation phase of the synchronization and network control methods was also established.Experimental facility of the excitation-control system in doubly-fed wind power generation was constructed and processed some related experiments based on the facility. When the wind speed changes, the amplitude of induction voltage and frequency the stator output reach entire accordance with those of electrical network by the self-regulation of PI, and the flexible connect between generator and electrical network is realized by synchronization grid-connection control method to satisfy the control requirement of wind power generator grid-connection safely. Through the analysis of the experimental results, the validity of control method was proved and it affirms that the experimental application of doubly-fed motor excitation-controller has good regulation.