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.
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.
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.
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.
Qiao L.,Chongqing Electrical Power Dispatching Control Center |
Zhang L.,Chongqing University |
Xu Y.,Chongqing Electrical Power Dispatching Control Center |
Liang W.,Chongqing Electrical Power Dispatching Control Center |
And 2 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2014
In order to improve the accuracy of wind power short-term forecast, a kind of new combination forecasting model is proposed combining the maximum-minimum approach degree with induced ordered weighted operator. According to different induced ordered weighted operators, different combination forecasting models can be constructed, namely IOWA combination model, IOWHA combination model and IOWGA combination model. Because real data are unknown in the forecast period and induced value of every single forecasting method can't be calculated in advance, this method can not be used to predict directly. Forecasting value of the highest accuracy combination forecasting model selected from different combination models built by single forecasting models instead of real data can solve the induced value calculation. Simulation results of two different wind power farms show that compared with some single forecasting models and another combination models, the forecast precision of IOWGA combination model is lower and predictive effect isn't improved; forecasting error indexs of IOWA combination model and IOWHA combination model are all lower and forecast precision of those is higher, moreover, predictive effect of IOWHA combination model is better than IOWA combination model, therefore, taking forecast value of IOWHA combination model as final prediction result can effectively improve the prediction accuracy of wind power.
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.
Yu M.,Chongqing University |
Wang J.,Chongqing University |
Ma J.,Chongqing Electrical Power Design Institute |
Peng H.,Chongqing Electrical Power Design Institute |
Xiong L.,Chongqing University
International Journal of Emerging Electric Power Systems | Year: 2014
A new method to measure the voltage in a grid has been proposed based on the studies of a novel electronic voltage transducer for the high-voltage power transmission equipment using the charge induction principle and electromagnetic computing method. The voltage measuring method has been improved, the real-time electric field position and orientation near the high-voltage transmission lines has been measured and the real-time voltage has been calculated by computing the electric field inverse problem. According to the electric field simulation with test data, the data compensation and calibration calculation were carried out. With the rapid engineering method on computing voltage, a non-contact electronic voltage transducer has been developed. First, we did the confirmatory test of the electric field detection and designed the preliminary model of the sensor. By the contrast test of voltage detection, the sensor was able to realize the voltage detection, but the precision was not high enough. Next, the measuring mechanism of the voltage transducer was analyzed taking account of strong interference from electromagnetic field, electric field distortion, changes in temperature and humidity, and impact between adjacent electric fields and conductor galloping. The measuring accuracy was satisfied by data compensation. © 2014 by Walter de Gruyter Berlin/Boston.