Analysis On Voltage Stability Of The Integration Of Wind Farm

Wind power,which possesses the advantages of cleaning and flexibility,has made wide application in power grid.Its development makes a influence an the steady operation of the grid.With the increasing capacity of wind power farm,the voltage level of the integration system has been improved from 380V to 110kV,even 220kV for some wind farm.The tendency has made more and more influence on voltage of district power grid,which caused a series of problems and conflicts.On the one side,the rapid growth of preliminary reserve and capacity of wind farm is much larger than the consumption capacity of grid.On the other side,the randomness and instability of wind power have made great negative affect on the quality of electric energy,power flow and stable operation.Rongcheng,as the "Low Carbon Economy Model City of Science and Technology",has vigorously promoted wind power projects,which has been recognized as green energy.From 2006 to 2015,in one decade,the electricity of Rongcheng has been developed rapidly.The electricity capacity of wind power has risen from 1.5KV to 45KV,with a yearly growth rate of 2.77%.Small-scale power load and big-scale wind power output will be the leading feature of Rongcheng in next few years.The studies on the integration of wind power farm to power gird become extremely urgent.Based on the above introduction,the influence on voltage stability,designing and analysis of the wind farm will be discussed in this paper.The main work is as following:(1)The basic theory of wind,the structure,classification,generation principle and integration method are described and summarized.Based on the basics above,the integration of wind power is discussed and the influence of the output of wind turbine on the voltage of system is analyzed.(2)Based on the situation of wind power integration,Case study is verified on a 110kV wind farm of Rongcheng in this paper.A detailed design program is formulated and analyzed which includes the selection of location,wind turbine,electrical connection and equipment,etc.(3)The influences on the integration of wind power farm to power grid and the causes are analyzed on the 110kV wind farm of Rongcheng in this paper.The issues above are illustrated and the results are analyzed in detail.The influences are mainly related to the capacity and type of wind turbine and so on.Accordingly,improvement measures about Technology and management are proposed.Firstly,for the improvement of voltage quality which the reactive compensation equipment made,simulation and analysis are achieved in this paper.Furthermore,based on a operation management of a power supply company,a new management system for wind power dispatch is proposed to improve voltage quality and optimize the integration of wind power.The results show that this management system significantly improves the voltage quality of this grid and obtain large efficiency.