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Optimal auxiliary frequency control of wind turbine generators and coordination with synchronous generators
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Optimal auxiliary frequency control of wind turbine generators and coordination with synchronous generators
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Journal Article
Optimal auxiliary frequency control of wind turbine generators and coordination with synchronous generators
2021
Overview
Auxiliary frequency control of a wind turbine generator (WTG) has been widely used to enhance the frequency security of power systems with high penetration of renewable energy. Previous studies recommend two types of control schemes, including frequency droop control and emulated inertia control, which simulate the response characteristics of the synchronous generator (SG). This paper plans to further explore the optimal auxiliary frequency control of the wind turbine based on previous research. First, it is determined that the virtual inertia control has little effect on the maximum rate of change of frequency (Max-ROCOF) if the time delay of the control link of WTG is taken into consideration. Secondly, if a WTG operates in maximum power point tracking (MPPT) mode and uses the rotor deceleration for frequency modulation, its optimal auxiliary frequency control will contain only droop control. Furthermore, if the droop control is properly delayed, better system frequency response (SFR) will be obtained. The reason is that coordination between the WTG and SG is important for SFR when the frequency modulation capability of the WTG is limited. The frequency modulation capability of the WTG is required to be released more properly. Therefore, when designing optimal auxiliary frequency control for the WTG, a better control scheme is worth further study.
Publisher
Chinese Society for Electrical Engineering Journal of Power and Energy Systems,China electric power research institute
