Scheme Study On Micro-grid System In Auxiliary Power System Of A Certain 500kV Substation

It's the energy development strategy of China to promote the new energy application to meet the global electricity demand and advocate for global energy interconnection.Micro-grid is an important part of the energy interconnection,which is also a way to apply the new energy generation.The auxiliary power system of a substation plays a crucial part in guaranteeing the safe and reliable operation of a substation.If there is a breakdown in the auxiliary power system,the substation protection may be out of order,the breaker and the switch may be unable to operate,and worst of all,the range of the power system accident may be enlarged.As a result,it is especially important to improve the power supply reliability of the auxiliary power system of a substation.The application of the micro-grid technology in the auxiliary power system can reduce the consumption of traditional fossil energy,which is both environmentally friendly and efficient.And on the other hand,it can improve power supply reliability regarding the island operation of the micro-grid.Consequently,this paper discusses the application program of the micro-grid in the auxiliary power system of a certain substation to ensure the uninterrupted power supply.In this paper,the design of the micro-grid system of the auxiliary power system of one certain 500 kV substation is studied.Firstly,this paper makes the analysis of characteristics of the auxiliary power system,and on this basis,the feasibility of applying the micro-grid in the system is studied.Secondly,through the reliability and economic contrastive analysis of several programs,the paper establishes of overall plan of the-system including system structure,function orientation,grid connection mode and operation mode.Thirdly,the paper analyzes the resources,environment and load characteristics of the substation.were analyzed.Based on this,a multi-objective optimized capacity allocation scheme is proposed considering the complementary characteristics of the wind and solar resources and load.And the equipment selection and optimization of wind power system,photo voltaic power generation system and energy storage system are completed based on the existing standards and engineering application experience.Finally,the paper makes a research on the different operating conditions of the micro-grid system and proposes a configuration scheme of the micro-grid protection and control system with adaptive operating conditions.