9.3. Generator Types in the Wind Energy Conversion Systems
The different types of electric generators used in WECSs are presented in Fig. 9.19.
A WECS can be operated at fixed speed or variable speed depending on the configuration of the wind turbine. The main benefits of both configurations are summarized as folows:
• Fixed speed operation: (1) simple electric system, (2) greater reliability, (3) low probability of the excitation of resonant frequencies of wind turbine elements, (4) no need for power electronics system, and (5) low cost.
Figure 9.17 Control of the mechanical power Pm.
Figure 9.18 Wind speed, active power, generator angular velocity, ...
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