高比例分布式光伏接入中低压配电网后,在午间时段,分布式光伏的高发电功率与用户的低负荷需求会导致配电网发生潮流倒送,进而引发过电压问题。在分析配电网过电压机理的基础上,提出基于功率传输转移分布因子(power transfer distributio...高比例分布式光伏接入中低压配电网后,在午间时段,分布式光伏的高发电功率与用户的低负荷需求会导致配电网发生潮流倒送,进而引发过电压问题。在分析配电网过电压机理的基础上,提出基于功率传输转移分布因子(power transfer distribution factor,PTDF)和电压灵敏度矩阵的光伏接入点倒送功率配额分配方法。然后,以该配额为基准,当接入点倒送功率大于配额且发生过电压问题时,采用Shapley值法计算每个接入点的分布式光伏主体对过电压应分摊的责任。最后,采用33节点算例验证所提过电压责任分摊方法的有效性。展开更多
This paper introduces the design of doubly fed system for conveyor belt motor, the system adopts stator flux orientation vector control technology and AC-AC inverter motor speed and power factor control, and carried o...This paper introduces the design of doubly fed system for conveyor belt motor, the system adopts stator flux orientation vector control technology and AC-AC inverter motor speed and power factor control, and carried on the test in transmission field. This paper introduces in detail the structure and characteristic of DSP system, and gives a design scheme of Doubly Fed Speed Control System of motor based on this chip.展开更多
Recently, Xiu et al. [Commun. Theor. Phys. 49 （2008） 905] proposed two schemes of teleporting an N particle arbitrary and unknown state when N groups of three particle general W states are utilized a.s quantum chann...Recently, Xiu et al. [Commun. Theor. Phys. 49 （2008） 905] proposed two schemes of teleporting an N particle arbitrary and unknown state when N groups of three particle general W states are utilized a.s quantum channels. They gave the maximal probability of successful teleportation. Here we find that their operation is not the optimal and the successful probability of the teleportation is not maximum. Moreover, we give the optimal schemes operation and obtain maximal successful probability for teleportation.展开更多
文摘高比例分布式光伏接入中低压配电网后,在午间时段,分布式光伏的高发电功率与用户的低负荷需求会导致配电网发生潮流倒送,进而引发过电压问题。在分析配电网过电压机理的基础上,提出基于功率传输转移分布因子(power transfer distribution factor,PTDF)和电压灵敏度矩阵的光伏接入点倒送功率配额分配方法。然后,以该配额为基准,当接入点倒送功率大于配额且发生过电压问题时,采用Shapley值法计算每个接入点的分布式光伏主体对过电压应分摊的责任。最后,采用33节点算例验证所提过电压责任分摊方法的有效性。
文摘This paper introduces the design of doubly fed system for conveyor belt motor, the system adopts stator flux orientation vector control technology and AC-AC inverter motor speed and power factor control, and carried on the test in transmission field. This paper introduces in detail the structure and characteristic of DSP system, and gives a design scheme of Doubly Fed Speed Control System of motor based on this chip.
基金Supported by the National Natural Science Foundation of China under Grant No. 10902083the Natural Science Foundation of Shannxi Province under Grant No. 2009GM1007
文摘Recently, Xiu et al. [Commun. Theor. Phys. 49 （2008） 905] proposed two schemes of teleporting an N particle arbitrary and unknown state when N groups of three particle general W states are utilized a.s quantum channels. They gave the maximal probability of successful teleportation. Here we find that their operation is not the optimal and the successful probability of the teleportation is not maximum. Moreover, we give the optimal schemes operation and obtain maximal successful probability for teleportation.
