Abstract
To solve the problem of grid-connected control of differential speed-regulating wind turbines, the wind turbine, transmission chain, speed-regulating motor, and generator model of the unit are constructed using the MATLAB/Simulink platform. The differential speed-regulating control system is designed on the basis of slip-frequency and fuzzy control theories. The speed control function and characteristics on maximum power tracing of wind turbine is tested via simulation. Meanwhile, the experimental bench for the differential speed-regulating wind power system is set up. Test results indicate that the generator speed is controlled by speed-regulating motor with output voltage and frequency that are approximately synchronized with those of power grid under idle load condition. The maximum wind-power utilization coefficient is maintained by fuzzy controller under the rated wind speed. Thus, the accuracy and efficiency of the designed control system is proven and provide important implications for further investigations on the grid-connected control of wind turbines with differential speed regulation.
Highlights
In recent years, China’s wind power industry has maintained a steady development trend
Simulation Results of Basic Operating Characteristics of Speed Control Motor 4.1.2 Simulation and Analysis of Maximum Power Tracking Operation Characteristics of Units The speed of the wind turbine directly affects the ability of the unit to capture wind energy
The wind turbine is in free rotation and the generator is not connected to the grid
Summary
China’s wind power industry has maintained a steady development trend. Variable-speed constant-frequency wind turbine has been widely used with the rapid development of wind power in China due to its economy and good tracking and utilization ability of wind energy. With China’s wind power industry gradually entering the stage of large capacity development, Variable-speed constant-frequency technology has been greatly upgraded and developed. The technical limitations of the power output control of generators are gradually emerging. The increasing capacity of single-machine systems has made the power matching of the core component converter a technical difficulty (Sainz, L., Monjo, L., Pedra, J., et al, 2017)(Huang, L., Xin, H., Zhang, L., 2017)
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