Study on Dynamic Characteristics of Frequency in Wind Turbine-assisted Hydropower-dominated Power Grid
The water hammer effect of hydraulic turbine may worsen the frequency dynamics of the regional power grid dominated by hydropower units,posing a potential threat to the frequency safety of the grid.The control of conventional virtual inertia of wind turbine can release the rotor kinetic energy and suppress the water hammer effect,but the virtual inertia control also affects the dynamic performance of the power grid frequency due to the introduction of differential-and proportional links.This paper proposes a novel method to improve the frequency dynamic characteristics of hydropower-domina-ted power grid aided by wind turbines.By controlling the short-term additional power of wind turbines,not only can frequency offset of hydropower-dominated power grid be suppressed,but the impact upon frequency transient performance is also reduced.Then,by setting control parameters reasonably,it is also possible to effectively avoid secondary frequency drops.Finally,based on the constructed simulation examples,the effectiveness of the proposed method is verified.
water hammer effectfrequency regulationshort-time additional power controltransient characteristicsecondary drop
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