Research On Direct Torque Control Of Variable Speed Constant Frequency Wind Power Generator

VSCF wind power system applications in the field of wind power in the wider and higher reliability. VSCF wind power system is divided into direct drive and double-fed, conventional double-fed wind power generator system uses a double-fed generator, the speed is relatively high, while the speed of the wind turbine is relatively low, it is not directly connected, must be connected through a gearbox, in practical applications, the failure rate of the gear box is relatively high, the noise unit is relatively large, and difficult to produce domestic technology. The direct-drive wind power generator system uses a permanent magnet synchronous generator, the speed is relatively low, directly connected with the use of wind turbines, over a series of problems to solve. In control technology, the traditional system is mostly used in vector control technology, which requires space vector coordinate changes, large amount of computation, complex structure, and direct torque control is directly in the coordinate system of the torque and stator flux control to solve the above computation volume, structure complex problems. This article is a direct torque control for permanent magnet synchronous generators to trackThis paper describes the general structure of the first direct-drive wind power systems and components of the structure and PWM rectifier, the basic principles are described in detail, in addition to the permanent magnet synchronous generator is derived separately at three different coordinate systems three kinds of mathematical models. Laid the foundation for subsequent research.Second, the subject of the principles of direct torque control technology has been described, and the control technology to the permanent magnet synchronous wind turbine system, the various components of the system described in detail. Including flux observed torque hysteresis comparator works and so on. Then the present study, the largest wind energy tracking control methods are introduced, and the more recognized four current tracking control method were compared to select the optimum tip speed ratio method to track the subject as the largest wind energy approach. Finally, the use of simulation software to build the whole system simulation model, on the basis of simulation and experimental results. Finally confirmed the system control scheme proposed by this project is feasible and in response to fast and accurate comparison. Based on the completion of the above work, this paper uses a DSP chip, completed a series of circuit hardware design of a...