Research On Dynamic Reactive Device Optimize Configuration Method In Receiving System

With the development of AC and DC transmission technology and the increase of grid capacity,the problem of ensuring stability is becoming increasingly acute.AC and DC transmission technology requires a certain amount of reactive power supply for support;increase the capacity of the grid makes the transmission line reactive power increases,the required reactive power support after the failure is also larger,which makes the power system And the operation stability deteriorates greatly.At the same time,industrial users,such as those producing aluminum and various rare metals,that consume large amounts of electricity in the grid can also have a negative impact on the stability of the system.Aluminum power plants need to reduce their electricity load when the voltage drops badly,and large enterprises with heavy load induction motors will promote the formation of voltage collapse when only capacitors are used to compensate their reactive power.Through the analysis of existing reactive power compensation equipment and measures,the paper found that the original static reactive power analysis method can not show the application of dynamic reactive power compensation device in modern power network from the principle and technical means.In order to analyze the more reasonable,more accurate calculation,closer to the actual situation of modern power grid,the evaluation method should be improved.Based on the above understanding,this paper presents a dynamic reactive power compensation equipment for optimal configuration and installation of the program.In this paper,K-means clustering technique and sensitivity analysis method are used to study the key fault and reactive power configuration sensitive node of the system from the viewpoint of weak voltage region.This method can reduce the dimensions of variables and improve the efficiency in the subsequent optimization of reactive power configuration.In order to quantitatively evaluate the transient voltage stability of a large-scale grid,the change of the voltage curve of the node after the fault is analyzed based on the criterion of the transient voltage stability,and the indexes for judging the stability of the grid and the grid are proposed.The calculation of the index can directly use the simulation result data of the fault in the actual system running,and no additional simulation analysis is needed.At the same time,it can directly measure the voltage stability of the system under different installation positions and different installation capacities,so as to quantitatively calculate the transient voltage stability of the system after installing the reactive power compensation device.In order to make the calculation simpler and more effective,a multi-objective optimization model is proposed.The Pareto front-end is obtained based on the NSGA-? algorithm,which is the optimal solution of the reactive power compensation installation scheme.In order to consider the large-scale application of the new power load equipment,the load type on the system voltage,the power supply system voltage quality of the higher requirements.The quality loss function based on quality engineering theory is proposed,the national economic loss caused by voltage sag is evaluated,and the voltage stability condition after fault is transformed into the economic cost index.Based on the Pareto front end of the optimal solution,Compensation for final optimization.Realize the unification of the technical and economical of the reactive power compensation device in the actual system.