Robust Control for Torque Minimization in Wind Hybrid Generators: An H∞ Approach

Abstract

This study focuses on implementing a wind turbine emulator based on a permanent magnet synchronous machine with excitation auxiliary windings and thoroughly investigates the space harmonics created by this innovative topology in MATLAB/Simulink. A Hybrid Generator (HG) is a robust generator that does not have slip rings or brushes in its structure. Furthermore, the flux of the hybrid generator HG may be easily adjusted as it is created by direct current excitation coils and permanent magnets. Unfortunately, the space harmonic rate in the HG is relatively high. In other words, the mechanical vibrations caused by the electromagnetic torque ripple threaten the drive train’s behaviour and, ultimately, the wind turbine’s lifespan. This study describes two methods for decreasing the ripple in electromagnetic torque. Both circuit architecture and robust H∞ control techniques are considered. After simulating the two approaches, a list of requirements is provided for the maximum allowable amplitude of the inductance and the flux harmonics.

Residual Strength Modeling and Reliability Analysis of Wind Turbine Gear under Different Random Loadings

“…It provides necessary information for preventive maintenance of the wind turbine, ensures safe and stable operation of the wind turbine, and can reduce shutdown costs. Reliabilitybased design optimization methods and control methods to improve the reliability of wind power systems have also been widely recognized and studied in recent years [7][8][9][10]. In conclusion, the calculation and analysis of gear reliability are very important.…”