智能自动电压控制(automatic voltage control,AVC)系统是智能电网的重要组成部分。总结了国内外AVC的发展现状,提出了智能AVC的概念与特征,和智能AVC的建设需由现在的AVC一代,经AVC二代过渡,向智能AVC(AVC三代)发展的方向,以及AVC二代...智能自动电压控制(automatic voltage control,AVC)系统是智能电网的重要组成部分。总结了国内外AVC的发展现状,提出了智能AVC的概念与特征,和智能AVC的建设需由现在的AVC一代,经AVC二代过渡,向智能AVC(AVC三代)发展的方向,以及AVC二代过渡时期的主要任务,包括调整电网无功补偿布局、增加动态无功补偿装置和智能发电厂、智能变电站建设等。解读了智能AVC的自适应与自愈等功能特征。举例说明了智能AVC使得电网的电压质量、线路损耗及电压稳定等3项指标能同时抵达最好状态,转变电网效益增长方式。最后指出电网无功的市场化是建设智能AVC的动力。展开更多
The key technologies of ultra-high voltage hybrid LCC-VSC MTDC systems are investigated,focusing on the design of system configurations,converter topologies and the control and protection system.A double converter per...The key technologies of ultra-high voltage hybrid LCC-VSC MTDC systems are investigated,focusing on the design of system configurations,converter topologies and the control and protection system.A double converter per pole of VSC connection is proposed along with the design of a 5000 MW VSC valve to develop a±800 kV/5000 MW large-capacity power transmission.The hybrid MMC topology capable of clearing the DC faults and the control strategy are developed to effectively improve the reliability in case of overhead line faults.The control and protection system of the LCC-VSC MTDC system is introduced to offer flexible operations under both normal and abnormal conditions,which includes voltage/current margin-based coordination,converter switch-in and switch-out,re-connection and drop-off of a third station.Simulations of an LCC-VSC MTDC system based on the LCC-VSC MTDC project are performed.展开更多
文摘智能自动电压控制(automatic voltage control,AVC)系统是智能电网的重要组成部分。总结了国内外AVC的发展现状,提出了智能AVC的概念与特征,和智能AVC的建设需由现在的AVC一代,经AVC二代过渡,向智能AVC(AVC三代)发展的方向,以及AVC二代过渡时期的主要任务,包括调整电网无功补偿布局、增加动态无功补偿装置和智能发电厂、智能变电站建设等。解读了智能AVC的自适应与自愈等功能特征。举例说明了智能AVC使得电网的电压质量、线路损耗及电压稳定等3项指标能同时抵达最好状态,转变电网效益增长方式。最后指出电网无功的市场化是建设智能AVC的动力。
基金This work was supported by the National Key R&D Program of China(2016YFB0901005).
文摘The key technologies of ultra-high voltage hybrid LCC-VSC MTDC systems are investigated,focusing on the design of system configurations,converter topologies and the control and protection system.A double converter per pole of VSC connection is proposed along with the design of a 5000 MW VSC valve to develop a±800 kV/5000 MW large-capacity power transmission.The hybrid MMC topology capable of clearing the DC faults and the control strategy are developed to effectively improve the reliability in case of overhead line faults.The control and protection system of the LCC-VSC MTDC system is introduced to offer flexible operations under both normal and abnormal conditions,which includes voltage/current margin-based coordination,converter switch-in and switch-out,re-connection and drop-off of a third station.Simulations of an LCC-VSC MTDC system based on the LCC-VSC MTDC project are performed.
