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<p><a href="page.php?w=field_coil">field winding</a>s, the <a href="page.php?w=magnetic_field">magnetic field</a> can be made to rotate, allowing variation in motor or generator speed. This is useful, for instance, for generators used in <a href="page.php?w=wind_turbine">wind turbine</a>s. Doubly fed electric machines are also used in variable-speed pumped-storage hydropower plants. Additionally, DFIG-based    wind turbines offer the ability to control <a href="page.php?w=active_power">active</a> and <a href="page.php?w=reactive_power">reactive power</a>.</p><p>
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