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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 |
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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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