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Sustainable Power and Energy Conference (iSPEC)

作者： Mouhai Liu Wei Zou Maotao Yang Rui Huang Shumin Wei Minqi Yu Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology State Grid Hunan Electric Power Company Changsha China

The load-characteristic charging of EVs and the power of distributed PVs have lately received great attention for car and electric industry due to their energy conservation and environmental friendliness. However, the disordered charging of EVs together with the distributed photovoltaic has made it challenging to meet the energy efficiency and electric quality. In an effort to overcome this challenge, the Monte Carlo method is adopted to calculate the charging load of EVs both in ordered and disordered way and the mathematical model of photovoltaic cell power is established. The reasonable dispatching in EVs and PVs is detailed demonstrated using MATLAB language, with certain day load in the area under the different circumstances. The proposed load characteristic method opens the door to research in the field of EVs and PVs, greatly enhancing the energy-using efficiency and the electric quality.

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Design Verification and Test Techniques for UHF RFID Tag IC

Design Verification and Test Techniques for UHF RFID Tag IC

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Sustainable Power and Energy Conference (iSPEC)

作者： Maotao Yang Shumin Wei Mouhai Liu Rui Huang Minqi Yu Fusheng Chen State Grid Hunan Electric Power Company Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha China

ISBN: (纸本)9781728149318

Radio Frequency Identification (RFID) technology has been rapidly developed in recent years. Electronic tag constitutes an important part of RFID system. This paper presents the design verification and test techniques suitable for UHF (Ultra High Frequency) RFID passive tag, which can meet the designers' demand for verification and test. Then, the IC baseband circuit test platform based on field programmable gate array is proposed. The platform can be used to verify the function of baseband circuit at design stage. It can also help designers with HDL (Hardware Description Language) code commissioning, so as to improve the reliability of circuit design, which can greatly improve the success rate of tape-out in practical applications. With regard to IC RF parameter test, this paper comes up with a low-cost test technical solution based on the commercially available card reader and the adjustable attenuator, which can be used to accurately measure the RF parameters such as IC sensitivity and input impedance without special RFID equipment, so as to guide the design of antenna and RFID. Based on the above-mentioned test scheme, the UHF RFID Tag IC that has been developed and taped out is tested in this paper.

关键词： UHF RFID tag IC baseband circuit sensitivity input impedance impedance design verification Radio frequency identification Ultrahigh frequencies Integrated circuits Field programmable gate arrays RFID tags Radio Frequency Identification Device Designers CARD READERS RFID system

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Solder joint image adaptive block compressive sensing with convex optimisation and Gini index

Solder joint image adaptive block compressive sensing with c...

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7th International Symposium on Test Automation and Instrumentation, ISTAI 2018

作者： Zhao, Huihuang Wang, Yaonan Zheng, Jinhua Qiao, Zhijun Zhang, Yun Department of Computer Science and Technology College of Computer Science and Technology Hengyang Normal University Hengyang Hunan China Hunan Provincial Key Laboratory of Intelligent Information Processing and Application Hengyang China Department of Electrical and Engineering College of Electrical and Information Engineering Hunan University Changsha China School of Mathematical and Statistical Sciences University of Texas Rio Grande ValleyTX United States Institute of Radio and TV Technology Communication University of Zhejiang Hangzhou310018 China

This study aims to improve the performance in solder joint image compression and reconstruction. A novel adaptive block compressive sensing with convex optimisation and Gini index (Ad_BCSGB_Gini) methodology for solder joint image compression and reconstruction is proposed. At first, the image is split into square blocks and each block is resized into a row which consists of a new image. Then, the new image is transformed into a sparse signal by an orthogonal basis matrix, and the image reconstruction is handled as a convex optimisation problem. Moreover, a gradient-based method which has fast computational speed is used to reconstruct image. There is a control factor which controls a norm l1 in the optimisation problem. To achieve the best performance, at last, the proposed method adaptively selects the best result by comparing Gini index of the reconstruction results based on different control factor values. Experimental results with different methods indicate that the Ad_BCSGB_Gini method is able to achieve the best performance in quantisation comparison than several classical algorithms, and Ad_BCSGB_Gini has a good robustness. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Convex optimization

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Proof for the Directivity of Circulation Intensity of Vector Field

Proof for the Directivity of Circulation Intensity of Vector...

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作者： Hui-ting XU Ming-da XIONG Can-hui ZHANG Fang YANG Dan ZHAO Jian-hong XIAO Long-min BU State Grid Hunan Electric Power Limited Company Power Supply Service Center (Metrology Center) Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Yiyang Electric Power Company

At present, the introduction of curl is based on the directivity of circulation intensity, which means that circulation intensity under any given normal direction can be expressed as the scalar product between a vector(that is, the curl) and the unit vector in the normal direction. However, there is usually no enough explanation on the validity of the directivity characteristics. Beginning from the definition of circulation intensity, a detailed deduction procedure of the expression of circulation intensity was present under any normal direction by using a square integral path, and the validation of the directivity characteristics was verified. The work in this paper provides students with a feasible mathematical approach to understand the directivity characteristics, and can also be treated as a comprehensive exercise for vector analysis and field theory.

关键词： Electromagnetic field Curl Circulation intensity Vector analysis

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Three-Phase Unbalanced Treatment Scheme Based on High-Speed Power Line Carrier

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Journal of Physics: Conference Series 2020年第1期1449卷

作者： Rui Huang Guang Guo Jianhua Chen Mouhai Liu Zhiguo Liu Minqi Yu State Grid Hunan Electric Power Company Changsha Hunan 410000 China Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha Hunan 410000 China

Most of the low-voltage distribution networks are three-phase four wire systems. Because of the quantity and dispersion of single-phase power users, the three-phase load unbalanced problem exists in a large number of low-voltage stations. With the continuous increase of power consumption level of the majority of power customers, the three-phase load unbalanced has become increasingly prominent in low-voltage station area. In this paper, the mechanism of three-phase unbalance generation and the defects of traditional treatment methods are introduced. On this basis, a three-phase unbalanced treatment scheme for low-pressure station area is proposed. The scheme can test out three-phase imbalance of low-voltage substation area quickly and accurately, and adjust the load phase sequence in real time without power failure through the intelligent commutation switch system, so that three-phase load in the station area lies a comparatively balanced condition. The scheme can cut down the loss of transformer and line caused through unbalanced three-phase load e in nicely. And it can restrain single-phase overcurrent, and solve the problem of terminal low voltage treatment.

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14th International Conference on Natural Computation, Fuzzy Systems and Knowledge Discovery, ICNC-FSKD 2018

作者： Chen, Shidong Chen, Xiangqun Hu, Junhua Lu, Jun Hu, Zesheng Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Hunan Changsha410004 China School of Electric and Electronic Engineering North China Electric Power University Beijing102206 China

ISBN: (纸本)9781538680971

Given the self-similarity characteristic of the communication traffic-flow in the current information gathering service traffic in power utilization network, a self-similarity modeling method is proposed to quantify the feature analysis of the communication flow for the power information gathering service. Firstly, the flow's characteristic and related course of the information gathering service traffic is analyzed, and a self-similarity model is built by means of combining the multiple ON/OFF flows. Secondly, the Hurst coefficient of the service simulation traffic is estimated using Variance-Time method to quantify the flow's self-similarity with the estimation results of Hurst coefficient. Finally, it discusses the influence of Hurst coefficient is discussed according to the two factors including the acquisition accuracy and the gathering periodic. Experimental results illustrate that the proposed method is effective to model the self-similarity of the information gathering service for the power utilization in Smart Grid. © 2018 IEEE.

关键词： Electric power utilization

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Study on Line Loss Status Classification Based on Decision Tree

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IOP Conference Series: Earth and Environmental Science 2020年第1期585卷

作者： Tan Haibo Luo Bingxiang Liu Mouhai Guo Guang Xie Xiong State Grid Hunan Electric Power Limited Company Changsha Hunan 410004 China Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha Hunan 410116 China

Line loss rate is the ratio of power loss to power supply in a certain period of time, and it is an important index to assess the technical economy of power grid. In recent years, with the increasing scale of power grid construction and the aging of power lines, the traditional monitoring methods with simple logic judgment can not meet the accurate judgment status of line loss, so it is urgent to effectively improve the lean management level of transmission and transformation line loss abnormality. In order to realize the automatic classification of line loss anomalies machine learning algorithm is proposed, the paper takes 1500 transmission line loss data as training samples, builds a line loss anomaly classification model based on decision tree, and realizes the accurate classification of line loss anomaly causes. Meanwhile, the paper uses KNN, support vector machine and decision tree algorithm to identify the anomaly for comparing the accuracy of different machine learning algorithms, and uses MATLAB software to verify the algorithm. The experimental results show that the comprehensive the recognition accuracy of decision tree for line loss anomaly is the highest, reaching 88.9%, 60% for support vector machine and 82% for KNN. This is of great significance to the realization of lean line loss management and has a high engineering value.

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Research on Impact Load measurement Method and Algorithm

Research on Impact Load Measurement Method and Algorithm

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Sustainable Power and Energy Conference (iSPEC)

作者： Dezhi Xiong He Wen Shidong Chen Xiaoping Zheng Maotao Yang Shuai Yang Rui Huang Yuping Su Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology State Grid Hunan Electric Power Limited Company Power Supply Service Center(Metrology Center) Changsha China College of Electrical and Information Engineering Hunan University Changsha China Weisheng Group Co. Ltd. Changsha Changsha China

ISBN: (纸本)9781728149318

Aiming at the problem that impact load affects energy metering, a method and algorithm for impact load measurement are proposed. The point-by-point power calculation process of impact load and the specific parameters of impact load filter algorithm based on IIR low-pass filter are given. For the key parameters affecting the accurate measurement of impact load, the DC component calibration algorithm, voltage and current gain calibration algorithm, voltage and current offset calibration algorithm, active and reactive gain calibration algorithm, active and reactive offset calibration algorithms are proposed respectively. The impact load experiment scheme is designed, and the error experiments of the State grid meter algorithm and the paper algorithm are carried out respectively. The experimental results show that the overall measurement error of the proposed algorithm is better than the ordinary State Grid meter algorithm, which can accurately measure the impact load electrical energy.

关键词： impact load load model error sampling electric energy meter impact loads Load modeling algorithms Sampling Error measure

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Design of power tester for HPLC power line carrier communication module

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Journal of Physics: Conference Series 2020年第1期1449卷

作者： Yu, Minqi Tang, Yun Huang, Rui Liu, Mouhai Yang, Maotao State Grid Hunan Electric Power Limited Company Power Supply Service Center(Metrology Center) Changsha Hunan 410000 China Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha Hunan 410000 China

The current equipment used to test the power consumption of power line carrier communication modules not only has low dynamic power consumption, but also fails to meet the accuracy requirements for AC power tests. Based on a careful analysis of the key technologies of the dynamic power test of the communication module, this paper designs a power tester. This paper introduces the working principle of the power tester, discusses the corresponding circuit design scheme from two aspects of DC power consumption and AC power consumption, and analyzes the calculation methods of the two in detail. Finally, the test results of each test system are compared and analyzed. The power tester can achieve higher accuracy data testing.

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Research on Performance of Anti-metal RFID in Field Test of Type and 500kV Substation

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IOP Conference Series: Materials Science and Engineering 2020年第1期740卷

作者： Maotao Yang Haibo Tan Mouhai Liu Xiangqun Chen Rui Huang Qin Liu State Grid Hunan Electric Power Company Limited Power Supply Service Center (Metrology Center) Changsha 410004 China. Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha 410004 China.

With the rapid increase of power equipment and increasing the size of the stock, the traditional means of maintenance of operation and maintenance can not meet the new needs of modern operation and maintenance, the urgent need to improve the level of power transmission equipment and power transmission equipment, intelligent perception of lean management level. RFID tags have been widely used in all parts of the state grid system, the performance difference showed against the anti-metal UHF RFID tags in different environment, this paper analyzes the different specifications of the anti-metal UHF RFID tag performance in the laboratory environment type test and the substation environment. Through laboratory environment simulation test and substation field environment test, research the frequency range and interference intensity of field electromagnetic interference in Substation, to get the main reasons that affect the performance of the anti-metal UHF RFID tags. It has certain value on research the interference mechanism of substation anti-metal UHF RFID tags and anti-metal UHF RFID tags application promotion.

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