To analyze and control complex networks effectively, this paper puts forward a new kind of scheme, which takes control separately in each area and can achieve the network’s coordinated optimality. The proposed algori...To analyze and control complex networks effectively, this paper puts forward a new kind of scheme, which takes control separately in each area and can achieve the network’s coordinated optimality. The proposed algorithm is made up of two parts: the first part decomposes the network into several independent areas based on community structure and decouples the information flow and control power among areas; the second part selects the center nodes from each area with the help of the control centrality index. As long as the status of center nodes is kept on a satisfactory level in each area, the whole system is under effective control. Finally, the algorithm is applied to power grids, and the simulations prove its effectiveness.展开更多
In this paper,a series of major policy decisions used to improve the power grid reliability,reduce the risk and losses of major power outages,and realize the modernization of 21st century power grid are discussed. The...In this paper,a series of major policy decisions used to improve the power grid reliability,reduce the risk and losses of major power outages,and realize the modernization of 21st century power grid are discussed. These decisions were adopted by American government and would also be helpful for the strategic development of Chinese power grid. It is proposed that China should take precaution,carry out security research on the overall dynamic behaviour characteristics of the UHV grid using the complexity theory,and finally provide safeguard for the Chinese UHV grid. It is also pointed out that,due to the lack of matured approaches to controll a cascading failure,the primary duty of a system operator is to work as a "watchdog" for the grid operation security,eliminate the cumulative effect and reduce the risk and losses of major cascading outages with the help of EMS and WAMS.展开更多
针对城市电网电压受负荷影响较大、中长期尖峰负荷难以预测等问题,提出一种基于蚁群优化双向长短期记忆神经网络的中长期电网尖峰负荷预测方法。解决了传统双向长短期记忆(bi-directional long short-term memory,BiLSTM)网络处理时间...针对城市电网电压受负荷影响较大、中长期尖峰负荷难以预测等问题,提出一种基于蚁群优化双向长短期记忆神经网络的中长期电网尖峰负荷预测方法。解决了传统双向长短期记忆(bi-directional long short-term memory,BiLSTM)网络处理时间序列数据时的局限性,并利用蚁群算法(ant colony optimization,ACO)在优化神经网络参数上的潜力来提高预测的准确性和可靠性;通过融合ACO和BiLSTM模型,实现自动调整网络参数,寻求最优解决方案,不仅提升了学习效率,还增强了对电网尖峰负荷特性的捕捉能力。通过对某地区电网数据进行测试,所提方法的预测时间和预测精度均超过传统BiLSTM。分析了蚁群优化策略对预测性能的影响,并探讨了预测不同时间尖峰负荷的表现。研究结果表明:利用ACO能有效辅助BiLSTM模型捕捉复杂时间序列特征,在中长期尖峰负荷预测中,显著提升了性能,模型的R2达到0.99,且平均绝对误差降低了7.8%。展开更多
基金the National Science Foundation of China (No.50525721, 50595411)the National Basic Research Program of China(No.G2004CB217902)
文摘To analyze and control complex networks effectively, this paper puts forward a new kind of scheme, which takes control separately in each area and can achieve the network’s coordinated optimality. The proposed algorithm is made up of two parts: the first part decomposes the network into several independent areas based on community structure and decouples the information flow and control power among areas; the second part selects the center nodes from each area with the help of the control centrality index. As long as the status of center nodes is kept on a satisfactory level in each area, the whole system is under effective control. Finally, the algorithm is applied to power grids, and the simulations prove its effectiveness.
文摘In this paper,a series of major policy decisions used to improve the power grid reliability,reduce the risk and losses of major power outages,and realize the modernization of 21st century power grid are discussed. These decisions were adopted by American government and would also be helpful for the strategic development of Chinese power grid. It is proposed that China should take precaution,carry out security research on the overall dynamic behaviour characteristics of the UHV grid using the complexity theory,and finally provide safeguard for the Chinese UHV grid. It is also pointed out that,due to the lack of matured approaches to controll a cascading failure,the primary duty of a system operator is to work as a "watchdog" for the grid operation security,eliminate the cumulative effect and reduce the risk and losses of major cascading outages with the help of EMS and WAMS.
