Design And Implementation Of Static Var Generator

With the continuous development of power system,the power grid environment is more and more complex,especially more and more nonlinear loads are continuously connected to the power grid system,which leads to various problems such as low reactive power,large three-phase unbalanced harmonic and so on.These problems directly reduce the power quality of the power grid,and even seriously affect the safe operation of the power grid.It is a common method to improve the power quality of power grid by using reactive power compensation equipment to solve the above problems.Static var generator has gradually replaced the original reactive power compensation device in practical application due to its advantages of fast response speed,high compensation accuracy,small harmonic content,flexible control and reliable operation.Starting from the development process of reactive power compensation,this paper introduces reactive power compensation equipment in different stages and makes a comparative analysis between them and technology.Then the basic principle of SVG is introduced emphatically,two different control methods are analyzed,and mathematical models are established respectively.Next,several common reactive power current detection methods are briefly analyzed,and the current detection methods of reactive power are deeply studied.Combined with current control methods,the appropriate control strategy is determined.On this basis,this paper designed an SVG system with TMS320F28335DSP as the core and IGBT as the main switching element.The software part adopts CCS3.3 integrated development software and designs the main program module,interrupt service program module and subprogram module which included initialization module,data processing module,SPWM pulse output module so that to realize the functions of control,data acquisition,data processing,signal transmission,display and protection etc.required by the systemFinally,through Matlab/Simulink to build a model and related experiments,the system is verified.The results show that the system constructed in this paper can compensate reactive power quickly,stably and dynamically,and obtain good effect.