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Design of Test Platform for Concentrator based on Virtual Electric Energy Meter
Jianying Fan,Hui Sun,Yang Wang,Dongqing Shi 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.9
For the current test of concentrator relay routing learning function in the laboratory, based on the hardware cost and the deployment environment, unable to realize large-scale electric energy meter group network, and real scene environment cannot be simulated. In order to solve these problems, the design of test platform for concentrator based on virtual electric energy meter is proposed in this paper. The design aims to simulate the communication routing network algorithm of electric energy meter and help the communication instruction to establish an optimal topology network which through using the specified data source, target source and the route address. So the concentrator can get the specific data through this preset network. This paper have also observed and analyzed the hierarchy order topology and compared with the autonomous learning topology of the concentrator relay routing algorithm. Then verify the deviation between communication routing topology and preset value, and eliminate the deviation. At the same time, verify whether the relay routing algorithm can get the optimal communication topology network.
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Li Sun,Xiaobo Ren,Jianying He,Zhiliang Zhang 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.2
Powder-bed fusion additive manufacturing technology makes it possible to produce parts with complicated geometry and high accuracy. However, dimensional deviation caused by powder overmelting and dross formation is still a challenge for manufacturing thin channels. In this study, the origins of the overmelting of printed thin channels were analyzed and a concept called “melting cell” is proposed to describe and quantify the geometric error. Based on the geometrical relationship between the melting cell and target channel, a method for predicting and optimizing the final geometry of thin channels is outlined. In order to verify the method, geometries of thin horizontal circular channels in various sizes are studied as examples. The predicted results by the proposed method show a remarkable agreement with available experimental results. Moreover, a new egg-shaped compensated design, which is able to improve the dimensional accuracy of thin horizontal circular channels, is presented. The proposed method is simple yet very effective. It can be easily extended to the manufacturing of thin channels with various shapes, materials, and different powder bed fusion processes.
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Fast cycle life evaluation method for ternary lithium‑ion batteries based on divided SOC intervals
Qiuting Wang,Jiani Sun,Hong Wu,Wei Qi,Hui Jin,Li Ling 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.5
Ternary lithium-ion batteries are commonly used in electrical power systems. It is necessary to accurately estimate the life characteristics of the battery cell/pack under specific cycle conditions. In this article, the empirical model of the capacity attenuation value is improved, and a mathematical model of the capacity attenuation rate is established. The cell capacity value based on the entire state of charge (SOC) interval and the divided SOC intervals are identified. The difference between them is calculated and analyzed. A multiple regression model is presented to describe the linear relationship between the health state parameters and the capacity value of a ternary lithium-on battery. Finally, an accelerated aging test is introduced, and a fast cycle life evaluation method is proposed. The proposed method is validated with experimental data under different charge/discharge currents. The obtained results show that the new model and the algorithms trained by divided SOC intervals are effective. They also show that the cycle life estimation error can be ranged within 3%. In addition, the cycle time of the aging test can be reduced to about one fifth of that with the traditional method.
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