Research On Coupling Characteristics Of The Output Between Wind Farm/Group

With the increasing numbers of the wind farm and a plurality of wind farmjoining the grid,the analysis of the impact of the single wind farm/group influence onpower grid can not accurately reflect the influence that joint action of wind/groupmade.The grid may overestimate the risk, and then set up large-scale energy storagepower station, which will make the waste of money and resources,thus impeding thelarge-scale development of wind power in a certain extent.In the present stage of our country, the scale of wind power has a sharpincrease.A plurality of wind power base have been started to built.To make up forinfluence that the wind power grid integration made, large-scaleenergy storage powerstation will be built.This led to a massive waste of economy and resources, and theproblems between the multi wind farm interconnection requirements andimplementation of electric network security, economic contradictions will furtherhighlights. In order to solve this series of problems, using the mathematical model todescribe the influence of multi wind/group made on line become the advantageoustool to make the in-depth analysis of power system stability of large-scale gridconnected wind farm after. In this paper,the main work is as follows:（1）This report is based on the digital dynamic simulation software DDRTSand further analysis the impact of the plurality wind farm/group influence on powergrid.Through the theoretical formula，this report deduced the mathematical model ofthe coupling characteristics of the wind farm output in the key node,defined thecoupling factor and analysis the influence that the energy added to the system madeon the coupling factor of mathematical model，then established the wide area wind/inter group output coupling simulation model,based on the DDRTS and "waveform"thinking;（2）Propose the localization method of the key line in power grid based on the sensitivity analysis of the power flow increment under the action of the windpower.Through a practical example simulation,this report analyzed and proved thecorrectness the mathematical model of the coupling characteristics of the wind farmoutput in the key node;（3）Discusses the influence that the wind farm output correlationindex and theStabilizing effect that the energy storage added on the wind power make on theaccuracy of output accuracy coupling model.It fully verify the proposed mathematicalmodel of the universal applicabilityand validity.This report laid the theoreticalfoundation for the research of the relationship between the output characteristic ofwind power storage and the capacity that the power grid consuming the wind power、energy frequency regulation and technology optimal allocation.This report has theimportant guiding significance for the stability evaluation of the power systemstability with large scale wind farms joining the grid.This paper is heavily supported by the Natural Science Foundation of China (51167018,51367018,51277157),Small and Medium-sized Enterprise Innovation Found (13C26216506358),Here I am in the deep gratitude.