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Qiu L.,China Three Gorges University | Xiao Y.,China Three Gorges University | Wang S.,Maanshan Power Supply Company | Deng C.,China Three Gorges University | And 2 more authors.
Russian Electrical Engineering | Year: 2015

Induction cooker is an energy-efficient kitchenware and known as the green stove which heats foods by the Joule energy. Coil inductance is an important technical parameter in the induction cooker system which mainly depends on the coil geometry size, the number of coil turns, and the distribution of the iron cores located a short distance away from the coil. Because of the iron cores, the magnetic flux density is nonlinear and the existing analytic formula for calculating coil inductance is not applicable. A three-dimensional finite element model (FEM) is introduced to analyze the distribution of the magnetic flux density and calculate the coil inductance in the induction cooker system in this paper. The FEM computed result is close to the experimental result with the relative error being 0.47%. Furthermore, two correction coefficients are introduced to modify the existing analytic formula and the relative error of the correction formula is less than 3%, which meets the industrial design requirement. © 2015, Allerton Press, Inc.


Wang S.-Q.,Maanshan Power Supply Company | Huang Y.-W.,Maanshan Power Supply Company | Wang J.,Maanshan Power Supply Company | Wang X.,Maanshan Power Supply Company | And 2 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2013

In integrating process of area models, the sub-block models can not be directly integrated because the electricity variable at the border and internal network do not match. Therefore, the method of sensitivity flow adjusting based on electrical distance is proposed. In this method, the distance among the nodes is measured by the derivative of the active power change rate along with the voltage phase change. Selecting the nodes with the smaller electrical distance from the boundary nodes as the adjusted nodes, then alternating iteration using the sensitivity correction can reduce the bias to within the required accuracy gradually. It only selects part of the nodes having a greater influence on the border as adjusted nodes, which does not increase the times of computation, but also can reduce the workload. The application based on IEEE 39 bus system verifies the effectiveness of the algorithm.


Jiaming W.,North China Electrical Power University | Wenying L.,North China Electrical Power University | Chang X.,North China Electrical Power University | Jing L.,China Electric Power Research Institute | And 3 more authors.
DRPT 2011 - 2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies | Year: 2011

An optimal Strategy based on multilevel fuzzy comprehensive evaluation model in restricting short circuit current is presented. This method starts with establishing hierarchical structural diagram of short circuit current limitation measures and multilevel fuzzy comprehensive evaluation model based on Analytic Hierarchy Process. Then the weight values of different levels can be determined by setting up a judgment matrix. Finally, the short circuit current level, steady-state security, transient stability and operation economy is taken into account by introducing fuzzy behavior indices and membership degree function. The limitation scheme can be evaluated systematically, comprehensivly and quantificationally through multi-level fuzzy comprehensive evaluation. Simulation is carried out by taking Jingjintang power grid as an example, the feasibility and practicality of the proposed method is verified. © 2011 IEEE.

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