Jiyuan Power Supply Company

Henan’an, China

Jiyuan Power Supply Company

Henan’an, China
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Hao F.,Jiyuan Power Supply Company | Dong Y.,China Institute of Technology | Li Q.,Jiyuan Power Supply Company | Zhao F.,Jiyuan Power Supply Company | Zhao B.,Jiyuan Power Supply Company
Advanced Materials Research | Year: 2011

With simple screen-printing method, the field emission display (FED) with carbon nanotube (CNT) as field emitters was fabricated. The flat glass was used as back-plane, and the sintered silver slurry was utilized to form the conducting lines. The blank back-plane and the cathode back-plane was combined to make a panel room, and the anode back-plane would be included in it. The panel image would be formed on the anode back-plane surface, which was fixed with the blank back-plane. The glass edge of anode back-plane was treated with a inclined plane, which the conducting lines on the blank back-plane could be connected with the indium tin oxide electrodes on the anode back-plane. The whole FED panel was packaged, which possessed good field emission property and emission uniformity. © (2011) Trans Tech Publications, Switzerland.

Liu Z.,China Institute of Technology | Dong Y.,China Institute of Technology | Li Q.,Jiyuan Power Supply Company
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2012

In this paper, a novel fabric skew detection method based on DFT and multi-projection analysis is proposed. First, perform DFT for the fabric image, then use the image binaryzation which is to remove redundant information. Rotate the binary spectrum of the image from -5° to +5° in small step. After each rotation, project the image to the transverse axis. Then detect the skew angle of the fabric image based on that a maximum of projection pixels appears in the center of the spectrum if the longitudinal centerline of the spectrum is vertical to the transverse axis. Experimental results show that this algorithm has high accuracy in detecting small amount of fabric skew and better adaptability of the fabric density. © 2012 Springer-Verlag.

Hou Y.-W.,Jiyuan Power Supply Company | Qian W.,Lanzhou Power Supply
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

In respect of 110 kV series lines containing self-supply power plant synchronization, this paper analyzes the existing problems of the conventional setting method. On the premise of the safe power supply, we propose that the protection of switch in load side should operate to the signal, then achieve the system splitting and reclosing by transformer gap protection (earth short-circuit) and distance protection (interphase short-circuit), and cooperate with the self-supply power plant's automatic splitting equipment. The feasibility has been analyzed and the practice demonstrates that the proposed solution can improve the reliability of power supply effectively.

Suonan J.-L.,Xi'an Jiaotong University | Wu S.-H.,Xi'an Jiaotong University | Hou Z.,Xi'an Jiaotong University | Hou Y.-W.,Jiyuan Power Supply Company | Zhou Z.-P.,XJ Electrical Corporation
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2012

Due to the series compensation capacitor, high-voltage transmission line impedance presents non-continuous performance which has an impact on the widely used relay principle. This paper establishes a simulation model of 750 kV series compensated line by EMTP software, and presents the free frequencies distribution and the decaying characteristics of current under transmission line fault by the least square matrix pencil method. The simulation results show that the method can accurately compute the frequencies and decaying factors and present the actual harmonic changes in the point of protection. This algorithm is suitable for transient harmonic analysis and provides guidance for transient protection.

Dong Y.,Zhongyuan University of Technology | Zhu Y.-S.,Zhongyuan University of Technology | Li Q.,Jiyuan Power Supply Company
Advanced Materials Research | Year: 2012

The information capacity of the characters on the license plate images affects the accuracy of recognition directly. To improve the recognition rate of vehicle license, considering the low cost of installing cameras nowadays, this thesis put forwards that, adopting images from two cameras in different angles. the license plate location, character division and feature extraction process are done separately, and then information fusion technique is used to confirm the more reliable recognition result, which can reduce the error recognition rate of characters. The contrast experiments show that this method can improve the accuracy of license plate recognition. © (2012) Trans Tech Publications, Switzerland.

Han P.,Henan Electric Power Research Institute | Zhao Y.,Henan Electric Power Research Institute | Li X.-P.,XJ Electrical Co. | Shi G.,Henan Electric Power Research Institute | And 3 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

This paper analyzes the status and technical difficulties of power system relay protection status maintenance and condition monitoring, describes the practical attempts of state maintenance in the relay protection, and proposes the three elements of achieving relay state maintenance: first, obtain device's status information fully, in particular, use comparison method to achieve condition monitoring of AC voltage and current channels and the secondary circuit; second, use a remote drive technology to solve the difficult problems of relay's output circuit parts and circuit breaker's implementation circuit state monitoring; third, collect familial defect information of protection devices extensively in provincial power system. Thus the architecture of provincial power grid relay state maintenance is designed, and has been applied in a 110 kV normal station and a 110 kV digital station.

Jiang J.,Zhengzhou University | Cheng Z.,Zhengzhou University | Zhu M.,Jiyuan Power Supply Company
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2011

The quantitative formula of accumulated temperature effect is given and the load forecast combining wavelet transform and neural network is proposed with the accumulated temperature effect. The load series is decomposed into the trend load series under different frequency bands and the detailed load series by wavelet transform, which are modeled and forecasted by BP neural network. The characteristic parameters, such as the accumulated temperature coefficients are added into the trend load series. The final forecasting result of load series is obtained by wavelet reconstruction. Case study shows the proposed method improves the load forecast accuracy effectively.

Zheng X.-F.,Henan Mechanical and Electrical Engineering College | Wei H.,Henan Mechanical and Electrical Engineering College | Qi S.-C.,Henan Mechanical and Electrical Engineering College | Hou Y.-W.,Jiyuan Power Supply Company
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

Battery status network monitoring system uses classification management mode, and the bottom monitoring base stations use the improved four-stage charging method, dynamically adjusting the conversion point value of the charging phase, and uploading real-time monitoring data. Upper management software uses LABVIEW programming with functions of battery failure detection, charge and discharge, temperature detection and parameter realtime disply. It online analyses various battery status data to achieve real-time online alarm when battery out of order. Remote monitoring can be achieved using Web Publishing controls in LABVIEW. Long-range battery input and removal can be realized by monitoring the base station. Through testing, the system can work reliably in large battery-powered systems.

Hou Y.-W.,Jiyuan Power Supply Company | Zhang Q.-F.,Jiyuan Power Supply Company
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

This paper calculates the economic operation point of 35 kV typical substation and analyzes typical daily load curve based on the analysis of theoretical of transformer economic operation. The time-interval control method is presented. And ultimately the optimal switch-on/off time is determined, transformer's operating mode is optimized, and actions times of equipment is not increased at the same time. Operation practice shows that the method can effectively reduce the transformer's complex power loss, with better economic benefits.

Bai Z.-M.,Xuchang University | Fang B.,Xuchang University | Zhang Y.-M.,Xuchang University | Hou Y.-W.,Jiyuan Power Supply Company
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

According to physics mathematical model of PV cell, the simulation model of Si type PV cell as well as PV array is constructed with adoption of or CAD/PSpice10.5 analogy behavioral model(ABM), and on this basis, characteristics of PV module are simulated. The simulation results show that the voltage of PV module on max power point has little correlation with intensity of illumination, but has an approximate linear decrease relationship with the cell temperature. The constant voltage tracking(CVT) method is improved, and the tracking control effects under the influence of illumination and temperature are analyzed. Simulation results show that the high precision simulation on large PV array power system can be carried out with orCAD/PSpice ABM, and the improved CVT based on temperature regulation in combination with PS-FB-ZVS is still a good control method with superior performance and practical value.

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