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Xiao B.,Northeast Dianli University | Mu G.,Northeast Dianli University | Li P.,Northeast Dianli University | Yan H.,Jilin Power Supply Corporation | Yang C.,Jilin Power Supply Corporation
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

By an analysis of the main factors that cause inaccuracies in the spatial load forecast (SLF) method based on time series, a time series mismatch corrective method for identifying and correcting load transfer is proposed. The temporary load transfer often occurring between cellules is divided into two types, i. e. cross-unit time load transfer and non-cross-unit time load transfer. With the time series mismatch corrective method, improved load transfer coupling (LTC) is used to overcome the negative impact on the SLF due to cross-unit time load transfer, while the cumulative load curve for determining the maximum load of each cellule is used to overcome the negative impact on the SLF due to non-cross-unit time load transfer. A practical SLF case has shown the applicability and effectiveness of the method proposed. © 2010 State Grid Electric Power Research Institute Press.

Yang Q.-X.,Beijing Jiaotong University | Wang W.,Beijing Jiaotong University | Xu L.-J.,Beijing Jiaotong University | Ni P.-H.,Beijing Jiaotong University | And 3 more authors.
Asia-Pacific Power and Energy Engineering Conference, APPEEC | Year: 2010

On the base of study on the characteristic of the currently existing parallel operation model of wind power and the technology of fractional frequency transmission system (FFTS), wind power system connected to power grid via FFTS is presented in this paper. The system is modeled and simulated with MATLAB/SIMULINK. FFTS is suitable for low-frequency wind power, has help in reducing the wind turbine size and weight, and can reduce transmission line loss. Results show that the FFTS is an effective and potential way used in wind power system connected to power grid. ©2010 IEEE.

Xu G.,Hohai University | Ma H.-Z.,Hohai University | Chen Y.,Jilin Power Supply Corporation
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2013

This paper briefly describes the application and principles of the critical impedance method (CIM) in the main harmonic source detection, focusing on the analysis of the reasons for the CIM errors in both ends of the source network, and the effect of the error on the main harmonic source detection. Single rank Broyden method is proposed to correct the critical impedance, which has the advantages of smaller amount of computing than the Newton method, less dependence on the initial value, etc. MATLAB simulation of two examples show that using this method to correct the critical impedance can accurately identify the main harmonic source, greatly improve the accuracy of critical impedance method in the harmonic source detection, and enhance the practical value of the critical impedance in the main harmonic source identification.

Wang Y.,Northeast Dianli University | Du M.,Jilin Power Supply Corporation | Zhang W.,Luoyang Power Supply Company | Zhang R.,Luoyang Power Supply Company
World Automation Congress Proceedings | Year: 2012

The traditional way of oil shale development and utilization often focus only on industry economic performance, but ignore the overall environmental and social benefit, which cause severe environmental destruction usually. It is a very efficient way to design an ecological industrial chain in order to promote utilizing efficiency on oil shale development. This measurement will coordinate protecting environment and promoting efficiency in the oil shale development. © 2012 TSI Press.

Cai G.W.,Northeast Dianli University | Wang Y.G.,Northeast Dianli University | Jiang Y.J.,Jilin Power Supply Corporation | Li T.F.,Jilin Power Supply Corporation
Applied Mechanics and Materials | Year: 2013

By revised method of fitting magnetization curve in segment, technique of simulating the nonlinear characteristic of laminated core is enhanced. The DC-bias problem is computed based on the time-domain magnetic-circuit coupled model while considering the saturated and unsaturated magnetizing characteristics of the laminated core. Experiments are designed to verify the validity of the proposed method, and then the volt-ampere feature of unsaturated magnetization is learned. Consequently, the results indicate that the improved method is more accurate and efficient by contrast. © 2013 Trans Tech Publications Ltd, Switzerland.

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