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Liu X.-H.,Chongqing University | He W.,Chongqing University | Yang F.,Chongqing University | Xiao H.-G.,Chongqing University | Ma J.,Chongqing Electrical Power Design Institute
Gaodianya Jishu/High Voltage Engineering | Year: 2011

We introduced numerical algorithms for electron transport parameters of air calculated by rigorous Boltzmann equation in order to solve a variety of air discharge in the electron transport parameters, and calculated the electron energy distribution function by using cross-section-data available in the literatures and solving the Boltzmann equation in plasma discharge. Moreover, we adopted the electron energy distribution function to calculate the electron diffusion coefficient, electron mobility and the effective ionization rate coefficient in air, and focused on the relation between average electron energy with electron diffusion coefficient, electron mobility and the ionization coefficient. Simulation results show that, the number of largest proportion electrons moves to the direction of higher energy with the reduced electric field strength increasing in electron energy distribution function. The electron diffusion coefficient and mobility are well in agreement with the experimental data of other researchers with error of 10%. The ionization coefficient is the same as the ionization coefficient of Maxwellian distribution function when electron average energy is higher than 2 eV. The model has been proved that the application to the plasma fluid model is reasonable and reliable. Source


Zhao X.,Wuhan Polytechnic University | Deng F.,Wuhan University | Liang H.,Chongqing Electrical Power Design Institute | Zhou L.,Wuhan Polytechnic University
Proceedings - 2015 11th International Conference on Computational Intelligence and Security, CIS 2015 | Year: 2015

When terrestrial laser point-cloud data are employed for monitoring the façade of a building, point-cloud data collected in different phases cannot be used directly to calculate the deforming displacement due to data points in a homogeneous region caused by inhomogeneous sampling. Aiming at this problem, a triangular patch is built for the previous point-cloud data, the distance is measured between the latter point-cloud data and the former patch in the homogeneous region, and thus the distance of the deforming displacement is determined. On this basis, the software of laser point-cloud monitoring analysis is developed and three series of experiments are designed to verify the effectiveness of the method. © 2015 IEEE. Source


Xie Y.,Chongqing University of Technology | Lu J.,Chongqing University of Technology | Weng Z.,Chongqing Electrical Power Design Institute | Yin Y.,Sichuan Province Electric Power Company
Dianwang Jishu/Power System Technology | Year: 2016

Randomity and fluctuation of wind power is the largest obstacle on large-scale wind power integration. With rapid development of energy storage technology, it becomes an important method solving problem to configure appropriate energy storage system in wind farm. Compared with single energy storage mode, combined configuration of different types of energy storage devices has technological and economic advantage. The paper proposes a wind power fluctuation characteristic index to quantify power output request of wind farm. On basis of wind power fluctuation characteristic index and power dispatching method with variable filter time constant, double-level optimization configuration model of hybrid energy storage system combined with battery and supercapacitor is founded, taking power output request of wind farm and technical and economic requests of hybrid energy storage system as constraints. Nested particle swarm optimization algorithm is adopted to solve the proposed model. Configuration results obtained with the proposed model minimize investment or annually total cost of energy storage system. Case study verifies correctness and effectiveness of the proposed index and optimization model. Effect of variation of characteristic index and energy storage mode and objective function of optimization model on configuration results is discussed. © 2016, Power System Technology Press. All right reserved. Source


Tang L.,University of Sichuan | Wang X.,State Key Laboratory of Power Transmission Equipment and System Security and New Technology | Qiao L.,Chongqing Power Dispatching and Communication Center | Sun L.,Chongqing Electrical Power Design Institute | Yang F.,State Key Laboratory of Power Transmission Equipment and System Security and New Technology
Asia-Pacific Power and Energy Engineering Conference, APPEEC | Year: 2011

The power frequency electric field in the HV substation has aroused more and more attention. In the paper, the power frequency electric field in 500kV substation is calculated using the boundary element method considering the influence of the switching equipment. According to the structural characteristics of the switching equipments, the indirect boundary integral equation of the suspension electrode was formulated. The modeling method and procedure for the power-frequency electric field calculation in the substation are presented. Finally, a typical 500kV substation is taken as an example for the calculation on the power-frequency electric filed, the IES coulomb is used, and results indicate that the power frequency electric field depends mainly on the height of the bus bar. To decrease the influence on the environment caused by the HV transmission lines and switching equipment, the height of the bus bar should be increased. © 2011 IEEE. Source


Yu J.,Chongqing University | Liu J.,Chongqing University | Chen T.,Chongqing Electric Power Research Institute | Zhang M.,Chongqing Nanan Power Supply Bureau | And 3 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2015

With the rapid development of wind power, detailed modeling of wind farms has become more and more difficult, which makes the wind farm equivalent are increasingly important in power system analysis. Existing equivalent methods of wind farm still has many defects. Therefore, a new method on wind farm static equivalent was proposed. This method considers the case that boundary node is PV or PQ comprehensively. With strictly theoretical derivation, it can keep the power flow and sensitivities of power system as well as boundary node consistent before and after the equivalent, which ensure the adaptability and accuracy of wind farm static equivalent. In order to ensure the accuracy that wind farm responses to the voltage and reactive power of power system and boundary node, weighted sensitivity method was used to correct the equivalent grounding branch. The simulation results demonstrated the effectiveness of the proposed theory. © 2015 Chin. Soc. for Elec. Eng. Source

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