Research On Tracking Control Of The Largest Wind Power In Large-scale VSCF Wind Power System

Energy is essential to the development of today's society may be less of it as a use of the most extensive and most convenient secondary energy, the promotion of a strong level of social productive forces and people's standard of living improved. The power industry in the rapid development of power system capacity in the continuing growth of the power of new technology has endless.Coal, oil, uranium ore and other mineral resources are in less than 200 years time depleted. While solar energy, tidal energy, biomass energy and other new energy not have scale, commercial exploitation and utilization conditions. Today wind power because of non-polluting technologies, shortening the construction period, investment flexibility, small footprint, low cost, has been the world's attention. With wind power technology continues to evolve, the wind power unit manufacturing costs and project development cost has increased and the development of wind power is the general trend.To enhance efficiency and the efficiency of power generation, modern wind systems to keep large and variable speed propeller Moment direction. Megawatt wind machine has become an international wind power on the market mainstream. China, the wind power system against the majority of small and medium-capacity systems, on-megawatt wind turbine group research is still at the fledgling stage. As large-capacity wind power systems physics experiment too costly but difficult to implement, the speed of large wind power system modeling and simulation is very important.Many in the computer simulation software, Dynamic Simulation System for the design and development of strategies to provide a direct, convenient, interactive graphical integrated simulation environment, access to a vast number of engineering staff of all ages.Based on the simulation is to establish a doubly-fed machine for large generators VSCF wind power systems as a whole dynamic mathematical model that includes Fan, transmission gear, generators, controller of four parts.Wind power to raise the efficiency of the system, low wind speed, VSCF wind power generating systems through the control of the output power or speed curve with the maximum power generators or speed to achieve optimal curve under different maximum wind speed of the capture. The traditional "largest wind energy acquisition" are often based on the optimal algorithm for the power curve and some fan known parameters, these parameters unknown or disturbed, wind power system efficiency will be severely reduced. To address the shortage, the paper design of "variable step-largest wind energy capture controller," the controller using vector control algorithm to achieve the generator output active and reactive power decoupling control; Against active power control, the controller under generator output speed disturbance, the corresponding output meritorious work rate changes "step change" to adjust to import system until system operation to the largest wind power points. Simulation results indicate that the "variable step-largest wind energy capture controller" is not dependent on the power curve and the optimal parameters fan, convergence speed and the ability to quickly achieve "maximum wind tracking" control, with a certain value.