Modeling Of The Permanent Magnet Wind Turbine And Its Networked Control Method

As environment and energy crisis is becoming increasingly serious, low-carbon and energy saving are advocated worldwide. Meanwhile, searching for renewable green energy becomes very important to the countries all over the world. As a kind of renewable green energy, wind power is drawing growing research enthusiasm and attention from engineers and scientists all over the world.Actually, wind generation is a comprehensive research area. Nowadays, the research mainly concentrates on large-scale wind turbines design, low voltage ride through, maximum power point trace, advanced control scheme and optimization algorithms design of wind turbines. Aiming at the networked control of direct-drive permanent magnet wind turbine, this thesis focused on wind generation of integration type and did research on the below aspects.1. Electromagnetic model of wind turbines was built. Voltage and flux model of direct-drive permanent magnet wind turbine in three phase static framework and two phase synchronous framework were derived. Based on the characters of direct-drive permanent magnet wind turbine, model acquired can be simplified via flux orientation. Furthermore, model of integration PWM converter was built.2. As the integration model of direct-drive permanent magnet wind turbine is strong coupling and nonlinear, it is difficult to design control law to control the direct-drive permanent magnet wind turbine. Considering universal approximation precision of fuzzy T-S model, in this thesis, fuzzy T-S model is used to simplify direct-drive permanent magnet wind turbine model, so direct-drive permanent magnet wind turbine can be analyzed and precise controlled.3. With the development of wind power generation technology, wind power penetration is gradually increasing; the impact of wind power in power system is becoming increasing large, this thesis put up with networked control method in wind integration operation of control and regulation originally. Networked model of wind generation is derived. Considering the different between the traditional point to point control system and networked control system, two major problems about networked-induced delay and data loss were taken into account in this thesis, the direct-drive permanent magnet wind turbine networked control model was built; in addition, a state feedback controller of the network control system was designed.