Impact Of Typical Nonlinear Shock Load On Power Quality And Its Treatment

With the rapid development of the power industry,power quality issues have become the focus of attention.More and more non-linear shock loads are connected to the power grid,which has a great impact on power quality and has disrupted the safety and stability of power system operations.Therefore,the state has set strict standard indicators for power quality,including voltage deviation,frequency deviation,three-phase imbalance,public network harmonics,voltage fluctuations and flicker,temporary overvoltages and transient overvoltages.If power quality problems occur,certain solutions and governance measures need to be taken to ensure the stable operation of the power grid.This paper classifies the non-linear shock load based on the gray clustering algorithm,divides the non-linear shock load into three-phase balanced load and three-phase unbalanced load,and selects a typical non-linear shock load for simulation model establishment and proposes corresponding treatment.Program.The specific research content is as follows:(1)Based on the gray clustering algorithm in the gray theory,the typical non-linear impact load is classified.PCC capacity,frequency deviation,three-phase imbalance,and voltage fluctuation are selected as classification indicators.The non-linear impact load is divided into three-phase balanced load and three-phase load.Phase unbalanced load.(2)Typical three-phase balanced load in the classification results was selected to build a wind tunnel load substation simulation model,and the wind tunnel load voltage fluctuation,voltage flicker and harmonic were calculated and analyzed respectively,and the control scheme and filter parameter design were proposed.(3)The typical three-phase unbalanced load in the classification results of electrified railway was selected,and a new simulation model of electrified railway was built by means of traction station V/v connection,and a method of connecting the load bus to SVC and adding capacitor to each other was proposed to solve the three-phase unbalanced problem caused by electrified railway.