Wind Power Ride Through Limit Optimization Considering Primary Frequency Regulation Of Wind Turbine Under Turbulent Wind Speed

With the improvement of wind power technology,wind power is showing a mainstream development trend in the low-carbon clean power industry.Due to the randomness and uncertainty of turbulent wind speed,the violent fluctuation of wind power has also brought huge challenges to the safe and stable operation of the power grid.Considering that wind turbines do not have inertia and frequency support capabilities,large-scale wind power integration will replace some conventional generator sets,resulting in a significant reduction in system frequency modulation capabilities.Therefore,it is necessary to develop and research wind turbine primary frequency modulation auxiliary technology.At the same time,in the process of planning the power grid,if the potential frequency modulation capability of wind turbines is ignored,the development scale of wind power will be greatly restricted.In this context,how to increase the wind power ride-through limit is of great significance to the development of power systems with a high proportion of wind power.This paper takes the power system containing wind power as the research object,builds a simplified model of wind turbines and a frequency response model of the power system,and conducts in-depth research on the optimization of wind power crossing the limit when wind power participates in a frequency modulation under turbulent wind conditions.The main research results are as follows:(1)The influence of wind power participating in frequency modulation on the promotion of crossing limit under turbulent wind speed is analyzed.Based on the turbulent wind speed scenario,this paper analyzes the output fluctuation characteristics of wind turbines under MPPT control and additional frequency modulation control,as well as the impact on the grid frequency.At the same time,combined with simulation examples under different wind power penetration rates,it is preliminarily verified that wind power participates in frequency regulation to improve grid frequency fluctuations.On this basis,considering that a fixed frequency modulation coefficient is difficult to achieve a better frequency modulation effect in rapidly changing turbulent wind speeds,this paper further analyzes the influencing factors of the frequency modulation parameter setting of wind turbines,and combines the frequency modulation control strategy of variable frequency modulation parameters.It illustrates the adaptability of the optimization of frequency modulation parameters under turbulent wind conditions,so that the wind turbines participating in the primary frequency modulation can take into account the stability of operation and the reliability of frequency modulation,which is conducive to the improvement of the wind power crossing limit.(2)The optimization method of wind power crossing limit with wind power participating in frequency modulation under turbulent wind speed is proposed.Based on the existing optimization model,this paper further considers the influence of wind power participating in primary frequency regulation on the grid frequency.At the same time,in view of the uncertainty of turbulent wind speed,this paper introduces a chance-constrained programming method in the process of designing target constraints.Even if the probability of satisfying the constraint is not lower than a certain confidence level,particle swarm optimization is used to optimize the design.Function to solve.Finally,combined with the IEEE 10-machine 39-node system,simulations were performed under different access points and different load changes,and the wind power ride-through limit considering wind power participation in frequency modulation and not considering wind power participation in frequency modulation was compared,and different confidence levels were compared.The influence of wind power ride-through limit optimization verifies the feasibility and superiority of the method proposed in this paper.