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省级调度中心风电场调度管理技术支持系统关键问题研究
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摘要
目前省级调度中心均已建设了EMS能量管理系统,用于电网的监控与调度管理,但不具备风电场监控功能,监控范围只限于风电场接入电网的升压站。因而为了在保证电网安全稳定运行前提下,尽可能提高电网接纳风电能力,省级调度中心必须具备监控和调度风电场的技术手段。本文以内蒙古电网实际工程为背景,从调度中心对风电场可观测可控制角度,论述了大规模风电场在线监视和控制的关键技术,提出了省级调度中心大规模风电场调度管理解决方案。主要研究成果和工作如下:
     1设计了省级调度中心风电场调度管理技术支持系统,阐述了省级调度中心风电场调度管理技术支持系统建设总体方案,提出了系统软硬件功能要求,提出了省级调度中心对风电场在线功率和电压控制功能实现框架。
     2通过研究风电场综合信息集成技术,提出了基于OPC技术的风电场综合信息采集方案,开发了OPC客户端程序,解决了风电场综合通信管理终端与不同风机生产厂商监控系统接口难题。风电场综合通信管理终端作为OPC客户端,风机监控系统为OPC服务器,实现了风电场本地系统实时信息的在线采集。
     3通过研究调度中心与风电场通信问题,提出了调度中心与风电场通信及数据交换解决方案。根据IEC 60870-5系列规约功能规范,编制了风电综合信息传输规约,满足了调度中心与风电场间进行实时数据、历史数据及文件等混合传输需要。
     4通过对风电功率预测方法研究,考虑风电场接入内蒙古电网方式,提出了物理模型与统计模型相结合的区域风功率预测方法,实现了大规模风电场风电功率的短期和超短期预测。该方法基于相似模型理论,使用BP人工神经网络方法,建立区域风功率预测模型。风电功率预测系统可对单个风电场、特定区域内风电场群和全网风电功率进行短期和超短期功率预测
     5为了使调度中心能对风电场像常规发电厂一样进行在线调度管理,实现风电场功率与电压在线闭环控制,探讨了基于风功率预测的风电场自动发电控制AGC方案和自动电压控制AVC方案。
     6针对风电场监控电力二次系统网络安全性问题,根据电力系统二次安全防护相关规定,论述了风电场调度管理技术支持系统安全防护问题。
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.
引文
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