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Current grid codes require the fault ride-through capability of modern wind turbines. During grid faults the reactive current control of the wind turbines should be used to support the grid voltage. With modern protection devices the fault durations are normally in a range of some hundred milliseconds or less. However this time window may be decisive for the stability of the conventional generators...
Current grid codes stipulate the same or similar behaviour during grid faults for wind turbines as for conventional power plants based on synchronous generators. But the technology and control of both devices is completely different. Since modern wind turbines use IGBT-based frequency converters, they provide a very fast control with the disadvantage of tight thermal limits for the IGBTs. The excitation...
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