直流配电系统是未来配电系统的发展趋势,大规模分布式能源接入是未来配电系统的重要特征。针对含软联络开关(soft open point,SOP)和电压源变流器(voltage source converter,VSC)的交直流混合配电系统,考虑分布式能源大规模接入引起的...直流配电系统是未来配电系统的发展趋势,大规模分布式能源接入是未来配电系统的重要特征。针对含软联络开关(soft open point,SOP)和电压源变流器(voltage source converter,VSC)的交直流混合配电系统,考虑分布式能源大规模接入引起的网络阻塞问题,提出了一种两阶段阻塞管理机制。在第一阶段,考虑交直流混合配电网中SOP、VSC及联络开关等可直接控制资源的优化调节能力,建立多资源协调优化调度模型。在第二阶段,考虑直接控制资源调节能力的限制,利用新能源电站、电动汽车充电站以及可调负荷等灵活性资源,以配电公司成本最低为优化目标建立阻塞管理控制模型。算例结果表明,所提出的阻塞管理机制,能够充分利用交直流混合配电网的优势,消除网络阻塞风险,降低阻塞管理成本,提高分布式能源的渗透率。展开更多
Software-defined networking(SDN),a new networking paradigm decoupling the software control logic from the data forwarding hardware,promises to enable simpler management,more flexible resource usage and faster deployme...Software-defined networking(SDN),a new networking paradigm decoupling the software control logic from the data forwarding hardware,promises to enable simpler management,more flexible resource usage and faster deployment of network services.It opens network functionality,application programmability,and control-to-data communication interfaces that used to be closed in conventional network devices,offering endless opportunities but also challenges for both existing players and newcomers in the market.Through a comprehensive and comparative exploratory of SDN state-of-theart techniques,standardization activities and realistic applications,this article unveils historic and technical insights into the innovations that SDN offers toward an emerging open network eco-system.We closely examine the critical challenges and opportunities when the networking industry is reshaped by SDN.We further shed light on future development directions of SDN in broad application scenarios,ranging from cloud datacenters,network operating systems,and advanced wireless networking.展开更多
文摘直流配电系统是未来配电系统的发展趋势,大规模分布式能源接入是未来配电系统的重要特征。针对含软联络开关(soft open point,SOP)和电压源变流器(voltage source converter,VSC)的交直流混合配电系统,考虑分布式能源大规模接入引起的网络阻塞问题,提出了一种两阶段阻塞管理机制。在第一阶段,考虑交直流混合配电网中SOP、VSC及联络开关等可直接控制资源的优化调节能力,建立多资源协调优化调度模型。在第二阶段,考虑直接控制资源调节能力的限制,利用新能源电站、电动汽车充电站以及可调负荷等灵活性资源,以配电公司成本最低为优化目标建立阻塞管理控制模型。算例结果表明,所提出的阻塞管理机制,能够充分利用交直流混合配电网的优势,消除网络阻塞风险,降低阻塞管理成本,提高分布式能源的渗透率。
基金supported in part by agrant from the National Natural Science Foundation of China(NSFC)(Grant Nos.61370232 and 61520106005)
文摘Software-defined networking(SDN),a new networking paradigm decoupling the software control logic from the data forwarding hardware,promises to enable simpler management,more flexible resource usage and faster deployment of network services.It opens network functionality,application programmability,and control-to-data communication interfaces that used to be closed in conventional network devices,offering endless opportunities but also challenges for both existing players and newcomers in the market.Through a comprehensive and comparative exploratory of SDN state-of-theart techniques,standardization activities and realistic applications,this article unveils historic and technical insights into the innovations that SDN offers toward an emerging open network eco-system.We closely examine the critical challenges and opportunities when the networking industry is reshaped by SDN.We further shed light on future development directions of SDN in broad application scenarios,ranging from cloud datacenters,network operating systems,and advanced wireless networking.
