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Yang C.X.,Wuhan Polytechnic University | Liu K.P.,Wuhan University | Zheng X.,Wuhan Electrical Technical Power College | Wang D.X.,Wuhan Power Supply Corporation
Advanced Materials Research | Year: 2013

Parallel harmonic resonance is closely related to the singularity of a node admittance matrix. It was found that the smallest eigenvalue of the matrix defines the mode of parallel harmonic resonance. This paper applies eigenvalue theory and modal sensitivity analysis method to determine which network components contribute significantly to a harmonic resonance phenomenon. Case study results further confirm the theoretical correctness and effectiveness. Thus, this practical method not only provides significant measures for harmonic resonance manage, but also support theoretical and experimental bases for the component parameter design. © (2013) Trans Tech Publications, Switzerland. Source


Lan J.,Wuhan University | Lan J.,Wuhan Power Supply Corporation | Wang D.X.,Wuhan Power Supply Corporation | Zheng X.,Wuhan Electrical Technical Power College | And 2 more authors.
Advanced Materials Research | Year: 2013

In this paper, a fault location method using power quality monitoring data is proposed. The fault location is divided into two classes including fault line recognition and fault distance calculation. Along the each power line in the target network some fictitious fault points are set and the fault voltage of each monitoring bus is calculated. The voltage dip calculation results and the fault line data are matched to form the learning samples and then train the designed fault line recognition BP artificial neural network. The trained neural network searches the fault line when actual fault occurs. After it finishes fault line searching the fault position is calculated using the function of voltage dip amplitude and fault position. The correctness and effectiveness of the proposed method is proved by the simulation results in standard IEEE-14 bus system. © (2013) Trans Tech Publications, Switzerland. Source


Zhang H.-F.,Military School of Engineering | Yu L.,Wuhan Electrical Technical Power College | Zhang S.-X.,Military School of Engineering | Jia L.,Military School of Engineering
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2016

We carry out a global analysis of the experimental data on the χc production cross section and the ratio σ(χc2)/σ(χc1) at the LHC and the Tevatron. The related long-distance matrix elements (LDMEs) at both leading order (LO) and next-to-leading order (NLO) in the QCD coupling constant are renewed. We also present the transverse momentum distribution of the χc production cross section and the ratio σ(χc2)/σ(χc1) for several experimental conditions and find that NLO predictions agree with all sets of experimental data. By contrast, at LO, one cannot explain all the data with a unique value of the color-octet LDME. A brief analysis of the nonrelativistic QCD scale dependence of the cross sections shows that, for the conditions we are concerned with in this paper, the dependence can be almost totally absorbed into the LDME. © 2016 American Physical Society. Source

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