Power System Load Modeling And Voltage Stability Analysis Study

Load model in power system stability analysis,digital simulation and operational decision-making plays an important role.Load model is to determine the credibility of simulation results.As the load with random time-variant, geographic dispersion,serious non-linear characteristics,resulting in load model is relatively rough,has affected the credibility of simulation results,and even in some cases possible to draw the opposite conclusion. With the in-depth study of voltage stability,in the many factors that affect the voltage stability,the load characteristics are the most active and most critical.The most direct factor that largely determines the voltage instability and voltage collapse process.In the voltage stability analysis,the load model a greater impact on the calculation results,inappropriate load model would make the calculated results are inconsistent with the actual situation,thereby constituting a potential risk of the system or cause unnecessary waste.In this paper,the method of measurement-based load modeling theoretical study,using a suitable description of a comprehensive load characteristics of the GMDH neural network method, established a new non-mechanism-type load model.Examples show that the method can be used to describe the measured load in all samples,while the Act also has a clear physical meaning, practical and convenient features.Secondly, based on load characteristics and voltage stability relationship.For different load models,dynamic load parameters,air-conditioning dynamic load and reactive power compensation capacitors on transient voltage stability of the impact of further study.Simulation results show that the load model structure and parameters of different pairs of power system transient voltage stability has a big differences.Conclusions for future load modeling work,in particular the establishment of transient voltage stability analysis for the load model structure and parameters of great importance.