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Fig. 10. Control of wind turbine with doubly-fed induction generator system [35 ]. (a) (b) Fig. 11. Basic control of active and reactive power in a wind turbine [17]. a) Doubly-fed induction generator system (System V) b) Multi-pole synchronous PM-generator system (System IX) The power control system should also be able to limit the power. An example of an overall control scheme of a wind turbine with a doubly-fed generator system is shown in Fig. 10. Below maximum power production the wind turbine will typically vary the speed proportional with the wind speed and keep the pitch angle fixed. At very low wind the speed of the turbine will be fixed at the maximum allowable slip in order not to have over voltage. A pitch angle controller will limit the power when the turbine reaches nominal power. The generated electrical power is done by controlling the doubly-fed generator through the rotor-side converter. The control of the grid-side converter is simply just keeping the dc-link voltage fixed. Internal current loops in both converters are used which typically are linear PI-controllers, as it is illustrated in Fig. 11a. The power converters to the grid-side and the rotor-side are voltage source inverters. Another solution for the electrical power control is to use the multi-pole synchronous generator. A passivePDF Image | Power Electronics in Wind Turbine Systems
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