The Journal of Engineering (Nov 2019)
Simulation study on direct-drive wind power system
Abstract
Direct-drive wind turbine is an important type of wind power technology. In recent years, it has also become the development trend of large-capacity wind turbines. It is difficult and expensive to establish physical simulation for wind in reality, which makes the real-time simulation model necessary in the study its power generation control strategy and operation characteristics. Here, the structure and basic principles of the direct-drive wind power system was studied, mathematical model of the dq generator and converter using coordinate transformation was built, and control methods including the wind turbine pitch angle control, maximum power tracking control, and generator-side variable flow control were simulated. Furthermore, a control strategy of generator-side converters and grid-side converters was proposed and studied based on the model in the real-time simulation system RTDS. Different working conditions as grid-connected normal operation and operation with grid fault were simulated within the strategy. Waveforms of current, voltage, power, torque were obtained and analysed. The simulation results showed that the simulation model reflected the operating characteristics of the direct-drive wind power generation system well, the control strategy performed successfully, and the features of the system in normal and faulted operation were preliminarily revealed.
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