Frequency Dynamic Characteristic Analysis of Wind Power High Proportion Power System with Constant Load Shedding Pitch Angle Control
In the new power system,it is necessary for wind power to actively participate in power grid frequency regulation.How to evaluate the impact of wind power participation in frequency regulation on frequency dynamic characteristics has also become a research hotspot.In this paper,an improved wind turbine pitch control with constant load shedding pitch angle that can reduce the number of pitch actions before the rated wind speed is proposed,and the expression of the difference adjustment coefficient of the wind tur-bine participating in primary frequency regulation under this control is derived.Based on this,the frequency response model of the power system with constant load shedding pitch angle control is constructed,and the analytical expression of the frequency dynamic characteristic index is derived.The influence mechanism of wind speed and initial pitch angle on the adjustment coefficient and frequency dynamic characteristic of the wind turbine is revealed.The accuracy of the frequency equivalent model and the ef-fectiveness and feasibility of the proposed frequency modulation method are verified by the improved IEEE three machine nine-node-system.
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