Inmicro-grid systems, wind turbines are essential power generation sources. The direct-driven
surface-mounted permanent-magnet synchronous generators (SMPMSGs) in variable-speed wind
generation systems (VS-WGSs) are promising due to their high efficiency/power density and the
avoidance of using a gearbox, i.e., regular maintenance and noise are averted. Usually, the main goal
of the control system for SMPMSGs is to extract the maximum available power from the wind turbine.
To do so, the rotor position/speed of the SMPMSG must be known. Those signals are obtained by
the help of an incremental encoder or speed transducer. However, the system reliability is remarkably
reduced due to the high failure rate of these mechanical sensors. To avoid this problem, this paper
presents a model reference adaptive system with finite-set (MRAS-FS) observer for encoderless control
of SMPMSGs in VS-WGSs. The motif of the presentedMRAS-FS observer is taken from the direct-model
predictive control (DMPC) principle, where a certain number of rotor position angles are utilized
to estimate the stator flux of the SMPMSG. Subsequently, a new optimization criterion (also called
quality or cost function) is formulated to select the best rotor position angle based on minimizing
the error between the estimated and reference value of the stator flux. Accordingly, the traditional
fixed-gain proportional-integral regulator generally employed in the classicalMRAS observers is not
needed. The proposedMRAS-FS observer is validated experimentally, and its estimation response has
been compared with the conventionalMRAS observer under different conditions. In addition to that,
the robustness of theMRAS-FS observer is tested at mismatches in the parameters of the SMPMSG.
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Inmicro-grid systems, wind turbines are essential power generation sources. The direct-driven
surface-mounted permanent-magnet synchronous generators (SMPMSGs) in variable-speed wind
generation systems (VS-WGSs) are promising due to their high efficiency/power density and the
avoidance of using a gearbox, i.e., regular maintenance and noise are averted. Usually, the main goal
of the control system for SMPMSGs is to extract the maximum available power from the wind turbine.
To do so, the rot...
»