Research Into The Reactive Voltage Optimization And Control Technology Of Jiangsu Offshore Wind Power Cluster Collector System

With the continuous development of the economic and society,people are more and more aware of the importance of protecting the environment.New energy promotion by our country has boost the development of a group of distributed energy sources such as wind energy and solar energy,which have given rise to research opportunities.Compared with onshore wind farms(cluster),offshore wind farms(cluster)have higher incoming wind speeds and greater development potential,but more challenges to solve.This thesis will study the reactive voltage optimization and control technology of the offshore wind farms(cluster).In China,the research on the planning standards and guidelines for the collector system and access system of offshore wind power is relatively lagging behind.For example,the submarine cable has a large charging capacitance,which requires that the reactance are configured on the wind farms side,collector system side and grid side.However,the current grid connection specifications for wind farms are mainly formulated for onshore wind farms that lack capacitive reactive power,and there is no relevant standard for offshore wind farms.This thesis analyzes and compares the schemes and standards of collection and transmission of wind farms at home and aboard,and analyzes the reactive power-voltage characteristics of large-scale offshore wind farms.A multi-objective coordinated reactive power planning method for offshore wind farms is proposed.The calculation method for total reactive power configuration capacity of the large-scale wind farms,the dynamic reactive power compensation capacity of the wind farms,and wind farm composite reactive power source configuration method considering the compensation capacity of wind turbines are established.Finally,this thesis proposes the reactive power coordination configuration method of large-scale offshore wind farms(cluster).The Rudong 900MW wind power cluster system in Jiangsu power grid is analyzed,and the optimal configuration of reactive power compensation in wind farm clusters is proposed.For the connection of large-scale offshore wind farms,suggestions for reactive power planning of Jiangsu offshore wind farms(cluster)collector system are proposed.