Research On The Key Issues Of Wind Farms Scheduling Management Technology Support System For Provincial Dispatching Center

Currently the EMS energy management system has been built in the provincial dispatch center, which is used for power grid monitoring and dispatch management. But it does not have the remote monitoring and control functions of wind farm, which can only reach to the wind booster stations.So in order to ensure safe and stable operation of power grid and with the maximized acceptance of wind power capacity, the provincial dispatching center must have the technical means for monitoring and scheduling of wind farm . Based on the actual project in Inner Mongolia Power Grid ,from the controlling and observing of the wind farm point of view,this paper discusses the large-scale wind farms on-line monitoring and control of key technologies.Then the dispatch management solution of large-scale wind farms is proposed .The main contributions and contents of the paper are as follows:1 The design scheme of large scale wind farms scheduling management technology support system for provincial dispatching center is proposed. Construction of overall program is discussed. The functional requirements of hardware and software system are proposed. Functional implementation framework of on line power and voltage control for wind farms in provincial dispatching center is proposed.2 Through studying the wind farm information integration technology, the comprehensive information collection program of OPC technology based is proposed. The development of OPC client applications solves the interface problems between wind farm integrated communications management terminal and different manufacturers wind turbine control systems. With wind farm integrated communications management terminal as the OPC client and wind turbine control system as OPC server, the real-time data on-line acquisition of local systems in wind farms has been implemented.3 By studying the requirements of communication between the dispatch center and wind farms, the solution of communication and data exchange for dispatch center and wind farm is proposed. According to the functional specification of IEC 60870-5 series communication protocol, Wind power integrated information transmission protocol is prepared, which meets the mixed transmission needs of real-time data, historical data and files for wind farms and dispatching center.4 By studying and analysising wind power prediction methods, considering the wind farm grid-connected ways in Inner Mongolia power grid, the regional wind power forecasting method has been proposed,which combines physical model with the statistical model. The regional wind power forecasting method can achieve the short and ultra short-term wind power forecast. Based on the similarity theory, the regional wind power forecasting models was established by using BP artificial neural network method. Using the method, the wind power prediction system can predict a single wind farm, wind farms group within a particular region, and the whole network of short and ultra short-term wind power.5 In order to make the grid dispatching center achieve on-line scheduling management of wind farm and wind farm power and voltage closed-loop control as conventional power plants, automatic generation control and automatic voltage control plans of wind farm have been studied.6 On the basis of safety regulations of electric secondary system, the safety issues of wind farms scheduling management technology support system have been discussed for the network security issues of electric secondary system of wind farm monitoring and control systems.