Maximum power point tracking based on auto-coupling PI control for a wind power generation system
DOI:DOI: 10.19783/j.cnki.pspc.201481
Key Words:wind power generation  maximum power point tracking  autocoupled PI control  total disturbance  robust stability
Author NameAffiliation
SU Jie School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha 410076, China 
ZENG Zhezhao School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha 410076, China 
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Abstract:There are problems of nonlinearity, uncertainty parameters and torque disturbance in direct drive permanent magnet synchronous wind power generation systems. Thus a maximum power point tracking control method based on auto-coupling PI control theory is studied. Aiming at speed tracking, the uncertainty of internal dynamics and external input torque of a generator is defined as a total disturbance, and the nonlinear uncertain system is mapped to an unknown linear system, and a controlled error system under the inverse excitation of the total disturbance is constructed. Based on that, an auto-coupling PI controller model based on the error speed factor is designed, and the robust stability and anti-disturbance robustness of the autocoupled PI closed-loop control system are analyzed theoretically. Finally, the simulation results show that the proposed control method can maintain the maximum power factor in a stable fashion. This approach has a good prospect for application in the field of maximum power tracking of a wind power generation system. This work is supported by the Key Project of Hunan Education Department (No. 17A006).
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