To satisfy the multiple priority requests from buses that arrive at different phases within a small time window, a multi-phase bus signal priority （MPBSP） strategy is developed. The proximity principle is brought fo...To satisfy the multiple priority requests from buses that arrive at different phases within a small time window, a multi-phase bus signal priority （MPBSP） strategy is developed. The proximity principle is brought forward to settle the conflicts among multiple priority requests and arrange the optimal priority sequence. To avoid over saturation of the intersection, a conditional MPBSP algorithm that adopts early green and green extension strategies is developed to give priority to the bus with the highest priority level when green time that each phase runs makes its saturation degree not larger than 0. 95. Finally, the algorithm is tested in the VISSIM environment and compared with the normal signal timing algorithm. Sensitive analysis of the number of priority phases, bus demand, and volume to capacity ratios are conducted to quantify their impacts on the benefits of the MPBSP. Results show that the MPBSP strategy can effectively reduce bus delays, and with the increase in the number of priority phases, the reduction range of bus delays also increases.展开更多
智能变电站的继电保护二次回路由直观的二次接线转变为不直观的网络数据流,扩建过程中必须考虑新间隔对运行间隔的影响,应采取合理恰当的安全措施。在分析了智能变电站检修机制的基础上,提出了220 k V母差保护不停电扩建的安全措施和扩...智能变电站的继电保护二次回路由直观的二次接线转变为不直观的网络数据流,扩建过程中必须考虑新间隔对运行间隔的影响,应采取合理恰当的安全措施。在分析了智能变电站检修机制的基础上,提出了220 k V母差保护不停电扩建的安全措施和扩建策略,并通过220 k V文津变电站220 k V出线间隔扩建工程,验证了扩建策略的正确性和安全措施的可靠性。展开更多
基金The National High Technology Research and Development Program of China(863 Program)(No.2011AA110304)the National Natural Science Foundation of China(No.50908100)Graduate Innovation Fund of Jilin University(No.20111044)
文摘To satisfy the multiple priority requests from buses that arrive at different phases within a small time window, a multi-phase bus signal priority （MPBSP） strategy is developed. The proximity principle is brought forward to settle the conflicts among multiple priority requests and arrange the optimal priority sequence. To avoid over saturation of the intersection, a conditional MPBSP algorithm that adopts early green and green extension strategies is developed to give priority to the bus with the highest priority level when green time that each phase runs makes its saturation degree not larger than 0. 95. Finally, the algorithm is tested in the VISSIM environment and compared with the normal signal timing algorithm. Sensitive analysis of the number of priority phases, bus demand, and volume to capacity ratios are conducted to quantify their impacts on the benefits of the MPBSP. Results show that the MPBSP strategy can effectively reduce bus delays, and with the increase in the number of priority phases, the reduction range of bus delays also increases.
文摘智能变电站的继电保护二次回路由直观的二次接线转变为不直观的网络数据流,扩建过程中必须考虑新间隔对运行间隔的影响,应采取合理恰当的安全措施。在分析了智能变电站检修机制的基础上,提出了220 k V母差保护不停电扩建的安全措施和扩建策略,并通过220 k V文津变电站220 k V出线间隔扩建工程,验证了扩建策略的正确性和安全措施的可靠性。
