| Electricity is one of the most basic basic guarantees for human beings.With the development of social productivity,high-power non-linear loads,the use of various power electronic devices are becoming more and more common,and the proportion of load is increasing,which poses challenges to grid power quality.In recent years,distributed power sources such as distributed photovoltaics,distributed wind power,small hydropower,and biomass power generation have developed into a blowout type.Such distributed power supplies may also affect the power quality of the power grid due to unstable output and a large number of rectifier inverter components.With the continuous advancement of the power system reform,the distribution network will become more independent and dispersed in the future.The power quality bearing capacity of the grid is positively related to its overall scale.In the context of increasingly dispersed and independent distribution networks,how to ensure power quality becomes an increasingly important problem.In this paper,taking a 110 kV substation as an example,on the basis of collecting actual operational data,through modeling and simulation,analyzing the problems and causes of power quality,proposing solutions and measures to improve power quality,the main work is as follows:Analysis of current wiring,operating load,user data in power supply area and existing problems in 110 kV substation;Using ETAP to model,through the analysis of simulation data,find out the existing problems of substation power quality and its specific reasons;In view of the power quality problems and their causes,combined with the comparative analysis of equipment selection,the power quality treatment measures and equipment configuration are selected,and some suggestions on the operation mode are put forward;According to the suggestions of equipment selection and operation mode,the modeling and simulation are carried out by using ETAP again,the treatment effect is evaluated,and the research conclusion is drawn.Through this research,with the help of a practical case analysis,summarize the common problems and causes of power quality of substation power supply,linear load and non-linear load mixing,and propose feasible solutions and suggestions for subsequent similar problems.Analysis and resolution provide ideas and experiences that can be used for reference. |
