Research On Three-level Coordination Model Of Automatic Voltage Control Technology Adapting To Wind Power Access For Southern Hebei Power Network

As the connection capacity of wind power is increasing in China,the voltage issue of reactive power has become one of the main factors restricting the access of large-scale wind power.It is necessary to establish the automatic voltage control of wind power collection area and effectively coordinate the conventional substation and thermal power plant which belong to the area and transportation channel to enhance the overall stability of wind power grid-connected region.Through in-depth studies of the coordination and interaction of AVC master and AVC sub-station,this paper presents a provincial,prefectural and county three-level voltage control technology adapting to wind power access.The real-time reactive power adjustment equivalent model of the wind farm is built,and the value of reactive power needed to adjust is calculated.Through limiting the restrictions,the bus voltage can meet the safety limit requirement.The method of combining AVC independent control and the coordination control of the control centers is adopted to solve the problem of coordination and optimization control of the reactive power and voltage of the multi-level control center and realize the optimal control of the global power network.A dynamic equivalence model is built to calculate the reactive power optimization of wind power transmission channel across multiple voltage levels.And a method is proposed to generate real-time dynamic equivalent model of wind power transmission channel in city-level dispatching AVC system.Besides,the method is presented to merge the online equivalent model and calculate the global reactive power optimization in provincial-level dispatching AVC system.Finally,the research can achieve coordinated voltage control conventional power plants,substations and wind farms,effectively improve the voltage quality of wind convergence region,enhance the ability to withstand abnormal area of wind power failure,effectively promote the intermittent energy dispatching level of Hebei electric power dispatching and control center,and improve the ability of wind power access.