Shanxi Electrical Power Corporation

Taiyuan, China

Shanxi Electrical Power Corporation

Taiyuan, China

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Bian X.,Tsinghua University | Meng X.,Tsinghua University | Wang L.,Tsinghua University | MacAlpine J.M.K.,Tsinghua University | And 2 more authors.
IEEE Transactions on Dielectrics and Electrical Insulation | Year: 2011

The variation of negative dc corona inception voltages with air pressure and humidity, using a point/plane electrode system, was studied using a perspex chamber in which the pressure and humidity could be varied. A method of calculation was developed to determine the corona inception voltages over a range of air pressures and humidities. The effective ionization coefficient was calculated as a linear interpolation of the effective ionization coefficients for dry air and water vapor. The validity of these calculations was confirmed by a series of experimental determinations of the corona inception voltages for the same range of pressures and humidities. A comparison of the negative and positive corona inception mechanisms was also made. Both the negative and positive corona inception voltages decreased with a decrease in the air pressure and an increase in the humidity. The greater values of the effective ionization intensity found in the critical zone for the negative corona accounted for their lower inception voltages. The mechanisms of the affect of the photo-absorption coefficient and Townsend's second coefficient on the negative and positive corona were also considered. © 2011 IEEE.


Zhou Y.,Tsinghua University | Guan X.,Tsinghua University | Wu F.,Tsinghua University | Zhang S.,Shanxi Electrical Power Corporation | And 2 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2012

Compared to single-circuit transmission line with the same voltage level, double-circuit transmission line has higher probability of lightning flashover, which is caused by structural characteristics, such as the more numbers of conductors, the higher tower-body, etc. In order to study the characteristics of double-circuit transmission line lightning flashover, according to engineering data collected from transmission lines in Xinzhou, Shanxi province, we established a simulation process applied to the double-circuit transmission line lightning flashover by the random mathematical method of Monte Carlo. The effects of random parameters in this process were discussed, and the different sensitivities to these parameters of double-circuit and single-circuit transmission line lightning flashover rate were compared. The results show that, compared to single-circuit transmission line with the same voltage level, double-circuit transmission line is more sensitive with lightning striking position, and the shielding failure flashover rate increases more quickly as the obliquity on the ground increases. After taking the power frequency voltage into consideration, the back flashover rates of double-circuit and single-circuit transmission lines are significantly increased. And with the high obliquity on the ground, the shielding failure flashover rate of single-circuit transmission line is decreased appreciably, and that of double-circuit transmission line is increased obviously.


Cai W.,State Grid Electric Power Research Institute of China | Deng H.,State Grid Electric Power Research Institute of China | Zhou G.,Shanxi Electrical Power Corporation | Wang J.,Shanxi Electrical Power Corporation | Yang F.,Wuhan Kangpu Changqing Software Technology Co.
IEEE Transactions on Dielectrics and Electrical Insulation | Year: 2013

In this paper, the optical technology is used to monitor ESDD near insulators on transmission line. This technique is based on the light energy loss and the distribution of optical field in the dielectric waveguide. Under the same measure environment, there has the certain correlation between the ESDDs of the polluted insulators and the ones of the quartz glass rod. Based on the experimental results, artificial neural networks (ANN) has been developed to model the relationships between ESDD by the optical technology and the measured ones. The contrasts reveal that the ANN-calculated ESDDs have the same corresponding with the measured ones for a practical system. © 1994-2012 IEEE.


Zou J.-L.,Xi'an Jiaotong University | Ma X.-K.,Xi'an Jiaotong University | Yang Y.,Shanxi Electrical Power Corporation
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2010

Because of switching nonlinearity, the slow-scale bifurcation with the line period time-scale may occur in the power-factor-correction (PFC) Boost converter. Firstly, all factors that influence the slow-scale bifurcation were analyzed and the influencing results were also revealed. Secondly, the load current feedforward method was introduced to control the slow-scale bifurcation through keeping the PFC converter from saturating. Finally, the theoretical analysis and simulating results were verified by experiment. The research results are beneficial to understand the slow-scale bifurcation in PFC converters more clearly and is helpful to the design of PFC converters. © 2010 Chinese Society for Electrical Engineering.


Wang K.Y.,Xi'an Jiaotong University | Luo X.J.,Xi'an Jiaotong University | Wu L.,Shanxi Electrical power corporation | Liu X.C.,Xi'an Jiaotong University
Renewable Energy | Year: 2013

The increasing integration of wind power into the existing power system demands for effective strategies to deal with wind intermittency and uncertainty. Relying solely on thermal power to cover wind uncertainty will sacrifice the operating efficiency and economy of thermal generators. In view of this, the adjustable hydropower is preferred for complementing wind fluctuation and uncertainty and the coordinated dispatch problem of wind-hydro-thermal power is established. Based on a newly designed water supplementing wind strategy, the original complex problem is decomposed into wind-hydro subproblem and thermal subproblem. A novel stochastic constraint related to wind power uncertainty is proposed and handled according to stochastic programming theory. By introducing the concept of expected breed rate and elitist preservation strategy, the particle swarm optimization (PSO) algorithm is improved and combined with the exterior penalty function method for solving the complete optimization problem. Optimal generation scheduling schemes that can make full use of wind energy and ensure efficient and economic operating of thermal generators are obtained by the proposed approach. Meanwhile the coordinating operation of wind, hydro and thermal power under different water resources and wind penetrations respectively are revealed and discussed. •Wind-hydro-thermal coordination scheduling problem is established.•Water supplementing wind strategy is designed for handling wind uncertainty.•The PSO is improved based on expected breed rate and elitist preservation concepts.•The obtained generation scheduling can avoid efficiency losses of thermal units.•Water supplementing wind stratagy ensures full use of wind energy. © 2013 Elsevier Ltd.


Patent
Shanxi Electric Power Research Institute and SHANXI Electrical POWER COMPANY | Date: 2011-08-29

An evaporative condenser radiating module for steam exhaust of a steam turbine comprises tube bundles and steam-water separating chambers. A steam-water separating chamber (4) between a section A and a section B, a section A downflow cooling section tube bundle (3), a section B downflow cooling section tube bundle (5), and a section C counter flow cooling section tube bundle (8) are disposes at the left side of a central steam-water separating chamber (7). An upper sealed space (10) of the steam-water separating chamber (4) between the section A and the section B is in communication with the central steam-water separating chamber (7) through the section C counter flow cooling section tube bundle (8). A lower sealed space of the steam-water separating chamber (4) between the section A and the section B is in communication with the central steam-water separating chamber (7) through the section B downflow cooling section tube bundle (5). A sealed section A steam entering chamber (2) is arranged on the left side of the steam-water separating chamber (4) between the section A and the section B. The section A downflow cooling section tube bundle (3) is arranged between the section A steam entering chamber (2) and the lower sealed space of the steam-water separating chamber (4) between the section A and the section B. The right side of the central steam-water separating chamber (7) is provided with tube bundles and steam-water separating chambers totally structurally identical with those arranged on the left side of the central steam-water separating chamber (7).


Patent
Shanxi Electric Power Research Institute and SHANXI Electrical POWER COMPANY | Date: 2011-08-29

A main stream temperature control system for a large boiler comprises a PID module, A/D converters (M2, M3, M4, and M5), D/A converters (M6 and M7), electrical water spray adjusting valves (AA101 and AA102) and main stream temperature sensors (T1, T2, T3, and T4) for the boiler. The system uses a function module (f (x)), a differential module, a division module, multiplication modules (F1 and F2), addition and subtraction modules (J1, J2, J3, and J4), set value modules (K1-K6), selection modules (N1 and N2), a time pulse module (S1) and small value comparison modules (Z1 and Z2) in a distributed control system, so as to construct a real-time online optimized circuit and form an independent automatic control system for dynamic tracking and stable control, thereby increasing the thermal economic index of the boiler, and achieving the objective of energy saving and emission reduction.


Patent
Shanxi Electric Power Research Institute and SHANXI Electrical POWER COMPANY | Date: 2011-08-29

An automatic monitoring and alarming device based on large strain of a power transmission tower comprises a solar cell (7), a wireless alarm sending device (6), an insulation basement (5) and a truss with great probability of generating large strain on the power transmission tower. One end of two invar alloy fine rods is respectively fixed on the insulation basement (5). The first invar alloy fine rod (1A) is fixedly adhered to the truss with great probability of generating large strain on the power transmission tower, and the arrangement direction of which is the same as the strain generating direction of the truss. The second invar alloy fine rod (1B) is sleeved with an insulation bushing (4) and is suspended on the outside of the truss with great probability of generating large strain. The solar cell (7), the wireless alarm sending device (6), a metal probe (2) and a metal contact (3) together form an alarm circuit. The strain of the service power transmission tower is automatically monitored and alarmed by the automatic monitoring and alarming device, which solves the problem that the large strain of the power transmission tower body can not be detected in time in the prior art.


Patent
Shanxi Electric Power Research Institute and SHANXI Electrical POWER COMPANY | Date: 2011-08-29

Disclosed is a method for determining the spatial location of a conducting wire and an aerial earth wire of a power transmission line, so as to solve the problem that the method in the prior art is not applicable to determining the spatial location of the conducting wire and the aerial earth wire of the conventional power transmission line with respect to lightning shielding failures. In the present invention, according to the physical locations of the conducting wires and aerial earth wires, the power transmission line shielding efficiency is calculated based on that the corresponding lightning shielding failure trip rate is zero when the exposure arc is zero, thus providing designing and operating units with a reliable analytical method for preventing lightning shielding failures, and meanwhile working out the shielding efficiency of the conducting wire of each phase more accurately, so as to analyze the structural relations between the aerial earth wires and conducting wires to determine the lightning protection effect of the whole power transmission line. The present invention provides a supplementary analytical method of the shielding efficiency of the existing power transmission lines.


Patent
Shanxi Electrical Power Research Institute and Shanxi Electrical Power Company | Date: 2011-08-29

Disclosed is a smoke dust sampling gun with a smoke dewatering device, with one end of a connecting sleeve (17) thereof being fix connected to the rear part of a gun body (20) and the other end being connected with a smoke dewatering device, wherein the smoke dewatering device comprises a circular tube-shaped dehydrator main body (2) and a circular tube-shaped discharged water storing cabin (3), with a plurality of wave-shaped red copper cooling fins (9) for gas being arranged in parallel inside the circular tube-shaped dehydrator main body (2) along the direction of the circular tubes central axis, and a gas inlet end of the circular tube-shaped dehydrator main body (2) and a gas outlet end of the discharged water storing cabin (3) being fix connected to each other; an end face (12) of a gas outlet end of a gas inlet pipe (5) is, having passed successively through the discharged water storing cabin (3) and a top face (11) of a cone-shaped inlet hopper (13), arranged in the cone-shaped inlet hopper (13); and an inner lining (10) of the discharged water storing cabin (3) is of a tapering shape. The sampling gun is simple in structure, thereby solving the problem of the existing equipment, i.e. that sampling equipment is easily damaged during the smoke dust sampling process, and is suitable for various kinds of smoke dust sampling equipment.

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