Simulation Research On Influence Of Power Quality Of Distribution Network With Wind Power Integration

The development and utilization of wind energy has been favored by industrialized countries,and the related technologies of wind power generation have developed rapidly.With the increasing penetration of wind power in the distribution network,the problems caused by wind power integration are becoming more and more obvious.One of the important problems is that the grid connected wind power has a negative impact on the power quality.Power quality is one of the important indexes to ensure the safe and reliable operation of power system and power equipment.The power quality problem caused by wind power integration has reached the level that can not be ignored.Therefore,it is of great significance and practical value to carry out the analysis of the impact of wind power integration on the power quality of the distribution network and take effective measures to improve the power quality.This paper expounds the basic principle and related theory of wind power generation.The relevant standards and requirements of power quality are explained.The influence of wind power integration on the power quality is studied,including voltage deviation,voltage fluctuation,harmonic voltage and unbalanced three-phase voltage.Taking the wind power generation system with doubly fed induction generator as an example,the voltage stability and harmonic components of the public power grid are simulated.In the simulation,the voltage of the common connection point of wind power generation is taken as the research content,and the various power quality problems under the transient conditions such as wind turbine switching,wind speed fluctuation and load change are analyzed.The influence of wind power on the voltage stability in the distribution network is analyzed.The factors causing voltage fluctuation,the mechanism of the fluctuation and the measures to suppress the fluctuation are explained.Simulation analysis of the influence of different power factor on the voltage of the wind power grid is carried out.The harmonic current of wind farm is analyzed,and the harmonic spectrum of wind farm output current under different working conditions is obtained,and the probability method is used to evaluate the harmonic current of wind farm.Finally,a power quality management method based on static var compensator is proposed.