Zhu L.,Xidian University |
Chen Z.,Communication Power Corporation |
Gu H.,Xidian University
ICOCN 2016 - 2016 15th International Conference on Optical Communications and Networks | Year: 2016
A multicast aware optical Network-on-Chip is proposed in this paper. The new architecture employs broadband microring resonators to reduce the number of microring resonator and decrease the complexity of the system. According to the evaluation analysis, the proposed architecture could reduce the number of MRS by 62.5%, the insertion loss by 34.5% and the power consumption by 11.2% at most. © 2016 IEEE.
Liu Z.M.,Beijing University of Posts and Telecommunications |
Zhang Z.G.,Beijing University of Posts and Telecommunications |
Li L.M.,Communication Power Corporation
Advanced Materials Research | Year: 2014
This paper is for real-time monitoring ice thickness problem of overhead lines, modeling the sag difference monitoring model, which is based on fiber Bragg grating (FBG) sensing technology and parabolic method. The model takes advantage of the overhead line sag difference constant of two monitoring points, and achieves absolute stress change values, which effectively offset various factors, such as the wind load and thermal expansion and contraction, in the impact of the model. The performance comparative analysis is carried out between the results of the model and synchronous monitoring results of vernier caliper. Experimental measuring results show that under the same conditions, the similarity of results between two methods is very high. The accuracy of monitoring results of the model can meet the project requirements and it can monitor ice thickness of overhead lines effectively in real time. © (2014) Trans Tech Publications, Switzerland.
Zhu Y.-F.,Jiangsu University |
Chen M.-Y.,Jiangsu University |
Wang H.,Communication Power Corporation |
Yao H.-B.,Jiangsu University |
And 2 more authors.
IEEE Photonics Journal | Year: 2013
We propose the design of a low-loss suspended core terahertz fiber with rectangular-shaped dielectric strips in the fiber cross section. The finite element method is used to analyze the characteristics of the suspended core terahertz fiber. Terahertz wave in a frequency range from 0.74 ∼ 0.95 THz is efficiently confined in the suspended core region with a total loss lower than 0.086 dB/cm (∼ 0.02cm-1). Meanwhile, any contact on the surface of this fiber will not disturb the field and induce additional losses. A 3.36-cm-long terahertz polarization splitter derived from this fiber with a transmission loss less than 0.89 dB, is also numerically demonstrated. A bandwidth of 0.032 THz at the center frequency of 1 THz with an extinction ratio better than-20 dB is obtained. © 2009-2012 IEEE.
Guo L.,Zhejiang University |
Guo L.,North China Grid Company |
Guo C.,Zhejiang University |
Cao Y.,Hunan University |
And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012
By evaluating the health status of high voltage circuit breaker, and considering these statuses in power transmission risk assessment, a new method for the power transmission risk assessment is presented, in which the operation status of high voltage circuit breakers is considered. A new outage probability model for power transmission risk assessment is developed by involving the effects of operation data of high voltage circuit breakers. Transmission risk is then calculated based on the model. The IEEE-RTS 79 system is used to calculate the adequacy risk of transmission system, and the demonstration shows that the method proposed is scientific and feasible. ©2012 State Grid Electric Power Research Institute Press.
Du J.,Communication Power Corporation |
Qian M.,CAS Institute of Computing Technology
2012 7th International ICST Conference on Communications and Networking in China, CHINACOM 2012 - Proceedings | Year: 2012
The development of smart grid requires higher data rate and wider coverage for current communication networks. What's more, the communication network should be rapidly and flexibly deployed in emergency situation. In this paper, we first investigate the requirements of communication network in smart grid. Then application of LTE in normal and emergency situations in smart grid is proposed. Finally, the network architecture and the optimize strategies of LTE system in smart grid are discussed. © 2012 IEEE.
Zhu Y.-F.,Jiangxi Normal University |
Chen M.-Y.,Jiangsu University |
Wang H.,Communication Power Corporation
IEEE Transactions on Terahertz Science and Technology | Year: 2015
We present a design and investigation of a low-loss terahertz fiber consisting of crossed rectangular shaped dielectric strips and a supporting outer cladding. The core-guided mode can be effectively confined in the fiber core with a large portion of mode power distributed in air holes adjacent to the solid material, which results in a low absorption loss property of the fiber. Low dispersion transmission can be obtained due to the thinner dielectric strips. In addition, a high birefringence on a level of 10 -2 over a wide frequency range can be obtained by simply adopting crossed dielectric strips with different thicknesses. © 2011-2012 IEEE.
Chen G.,Chongqing University |
Ma A.,Chongqing University |
Zhang J.,Chongqing Electrical Power Corporation |
Tang Y.,Chongqing University |
He G.,Communication Power Corporation
Dianwang Jishu/Power System Technology | Year: 2010
Voltage and reactive power control (VQC) in substations is an important component of automatic voltage control (AVC). In view of the defects that traditional VQC strategies are not adapted to AVC and their control effects are unsatisfied, in this paper a new VQC strategy for substation is proposed. According to this strategy and based on desired voltage value of AVC, adjusting times of on-load tap changer (OLTC) and switching times of capacitor banks, a multi-objective decision-making model is constructed. For the selectable schemes to solve the proposed model an objective decision matrix is built and through non-dimension treatment the objective decision matrix is changed into relative superior attribute degree matrix of all objectives. To overcome the shortcoming of single weight determination and make the determination of weight more effective and reasonable, the improved analytical hierarchy process (AHP), i.e., the subjective weight determining, and dispersion maximization, i.e., the objective weight determining, are integratively utilized to determine the weight the weights of indices. Finally, the optimal control strategy is solved by multi-objective decisionmaking based linear weighted sum. The feasibility and superiority of the proposed control strategy are verified by calculation example.
Zhang J.S.,Communication Power Corporation |
Xia X.,Communication Power Corporation
Advanced Materials Research | Year: 2013
Failure and security risks of communication optical cable in electric power system caused by anomalous changing of strain have been investigated, the current situation of the strain monitoring system for optical cable of electric power system has been introduced, and the principle and features of measuring the strain by using fiber grating sensing technology have been presented. The new method that can be used in strain monitoring for communication optical cable of key position in electric power system has been put forward, and fiber grating sensor scheme has been designed. Finally, several key technical problems in its practical application have been analyzed in detail. © (2013) Trans Tech Publications, Switzerland.
Hao J.,Northeast Dianli University |
Liu D.,Communication Power Corporation |
Li Z.,Northeast Dianli University |
Chen Z.,Northeast Dianli University |
Kong L.,Northeast Dianli University
Energy Procedia | Year: 2011
Accuracy of power system load forecasting is affected directly by existing considerable uncertainties, which are accompanied with some correlation among load factors. And this relationship between variables can be eliminated with fuzzy clustering based on historical load in a large number of observations. Carrying out the load factors on the reduction tactics, the impact factors have been classified. Then the target theory is adopted under the standard model of predictors. Then the weight coefficients between the factors category and the predictor are determined in the ways of calculating contributing degrees to various components indicators. For verification, an actual data is provided from a power grid and sorted into four types. Contributing degrees for predicting of the 4 factors are found. It is shown by result analysis that the combined method takes advantages of accuracy and efficiency in prediction. © 2011 Published by Elsevier B.V.
Yu M.-Y.,Communication Power Corporation
Journal of Multimedia | Year: 2013
Image encryption is an active and challenging research area. This article proposes a transposing and scrambling image encryption algorithm based on improved hyper-chaotic sequence to provide enhanced security for encrypted image transmission. The algorithm processes the hyper-chaotic sequence according to the pixel information, which makes the keys be sensitive to original image. Then we apply scrambling and transposing operation to the pixels in image, according to separate scrambling keys and grayscale transposing keys. The result of simulation shows that, the encryption algorithm proposed by this article is effective in image encryption and decryption, which could enhance the security of image encryption and reduce the risk of attack. © 2013 Academy Publisher.