The current wind turbine technology mainly has key technical problems.
According to years of experience in wind power operation, from the perspective of power grids, the current wind turbine technology mainly has the following key technical problems: fault traversing capability fault traversing capability includes traversing capability and high voltage traversing capability. For the low voltage ride-through capability of the wind turbine, according to the national grid company standard Q/GDW392-2009, the low voltage ride-through capability of the wind turbine is only as follows: when the wind turbine terminal voltage drops to 20% of the rated voltage, the fan can guarantee It can run continuously for 625ms without off-grid; when the fan terminal voltage can recover to 90% of the rated voltage within 2s after falling, the fan can ensure continuous operation without off-grid.
The active power of the fan should be quickly recovered after the fault is cleared. From the moment of fault clearing, the power change rate of at least 10% of rated power/second is restored to the value before the fault. However, this regulation provides the fan reactive power support capability, active power contribution, fault determination time length, reactive current support response time, electrical overshoot magnitude after the fault is completed, and the time required to enter the stabilization, and the fault. Parameters such as the frequency of occurrence are not clearly defined. Some models do not have low voltage ride-through capability. The low voltage ride-through capability of some models does not meet the current standard requirements. The low voltage ride-through capability of some models needs to be deeply explored. As for the high voltage ride-through capability of wind turbines, there is no formal industry standard yet, but the “concept†is being formed, and it will certainly be one of the key technical challenges facing the wind turbine.
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