Dai Wan

Southeast University

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Hengyi Zhou

Hunan Xiangdian Test Research Institute (China)

Miao Zhao

Chengdu University of Information Technology

Fei Qi

Shanghai Jiao Tong University

Xujin Duan

State Grid Hunan Electric Power Company Limited

Simin Peng

Hubei University of Technology

Kai You

Shenzhen University

Weihua Zhou

KU Leuven

Liuming Mao

Hunan Xiangdian Test Research Institute (China)

Tao Peng

Beijing Institute of Technology

Jinliang Li

Qingdao University of Technology

Cooperative Institutions

State Grid Hunan Electric Power Company Limited

Hunan Xiangdian Test Research Institute (China)

Southeast University

Shanghai Jiao Tong University

Huazhong University of Science and Technology

Sichuan University

University of Chinese Academy of Sciences

Chinese Academy of Medical Sciences & Peking Union Medical College

Chongqing University of Posts and Telecommunications

Chinese Academy of Sciences

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An Auto Disturbance Rejection Control Method for Four Rotor UAV Flight Operation

Dai Wan Simin Peng Jinliang Li Peng Liang Yingying Yi

The four rotor unmanned aerial vehicle (UAV) can carry out all-round and efficient inspection of power equipment. At present, the four rotor UAV has become an essential equipment in the inspection of transmission lines. However, the support of UAV for distribution line inspection is far less than that for transmission line inspection. This is mainly because the operating environment of distribution lines is much more complex and harsh than that of transmission lines. In the process of power distribution line inspection, all kinds of environmental interference are far more than transmission lines. The existing four rotor UAV control methods have poor resistance to external interference. Aiming at the above problems, the research on ADRC method of four rotor UAV is carried out in this paper. The principle of active disturbance rejection is analyzed. A linear active disturbance rejection scheme is proposed. The attitude control module of UAV is designed. The simulation model of ADRC system of four rotor UAV is constructed. The simulation results show that the ADRC method can effectively alleviate the influence of random interference on the flight state of UAV. For the UAV operating in complex environment, it is necessary to optimize the anti-interference of its control system. The research results have guiding significance for improving the anti-interference ability of UAV in the process of distribution line inspection.

Line (geometry)

10.1007/978-3-031-31733-0_40

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Research on Fast Access Technology Based on Shared Energy Storage of Electric Vehicles

Jinliang Li Yang Miao Dai Wan Miao Zhao Jie Tao

Under the background of comprehensively promoting the "dual carbon" strategy, the potential of multiple applications of massive electric vehicles will be fully tapped to carry out electricity protection work with electric vehicles as energy storage medium. At present, users would have short power outage when having access to electric vehicles to restore power supply. In view of this, the fast access technology of electric vehicles and the automatic switching method are presented in this paper, and the corresponding device has been developed. The temperature field simulation analysis and verification of the model were carried out, and the temperature rise test of the device was carried out simultaneously. The method and device has the certain reference value for further research on quick power recovery technology.

10.1007/978-3-031-31733-0_37

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An Improved Method for Calculating Power Transmission Equipment Loss and Hot Spot Temperature in Distribution Network under Harmonic Disturbance

Dai Wan Fei Qi Miao Zhao Liuming Mao Xujin Duan

Distribution transformer is widely used as an important energy transmission equipment. In recent years, with a large number of non-linear loads used in power grid, the impact of harmonic pollution on the power system has become more and more serious. Harmonic disturbance affects the no-load loss, load loss and hot spot temperature of distribution transformer, thus further shortening the service life of transformer. An improved method for calculating loss and hot spot temperature is presented in this paper. Firstly, the influence of harmonics on load loss is analyzed. The load loss calculation model of transformer under different connection groups is established. Secondly, the variation of core loss with harmonic frequency and flux density is analyzed. The load loss calculation model of transformer under different connection groups is established. Finally, the temperature rise calculation model proposed by IEEE C57.110 is revised. Considering the effects of stray loss and no-load loss, a more accurate method for calculating hot spot temperature is proposed.

Energy efficient transformer

Transmission loss

Harmonic Analysis

Copper loss

Power loss

10.1109/ei247390.2019.9061860

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A Calculation Method of Distribution Power Transmission Equipment Hot Spot Temperature Based on Relative Load Coefficient

Xujin Duan Dai Wan Miao Zhao Fei Qi Hengyi Zhou

With the increase of power load year by year, the number of low-voltage users is increasing. Affected by factors such as uneven distribution of power load, three-phase unbalance is becoming more and more serious. Three-phase unbalance can easily lead to single-phase overload of distribution transformer, thus increasing the hot-spot temperature of winding. Especially in the peak period of power consumption, it is easy to cause burnout of heavy overload distribution transformer. According to the relative load factor, the calculation model of winding hot spot temperature of distribution transformer under three-phase unbalanced operation is constructed in this paper. Based on this model, the relationship between winding hot spot temperature and three-phase unbalance is analyzed. The results show that the three-phase unbalance has a great influence on the winding hot spot temperature. With the increase of unbalance, the hot spot temperature of transformer rises sharply.

Energy efficient transformer

Three-phase

10.1109/ei247390.2019.9061854

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Research on the Loading Capacity of Solid Insulated Energy Transfer Equipment under Harmonic Actions

Dai Wan Hengyi Zhou Fei Qi Simin Peng Xujin Duan

The external insulation performance of the winding of dry-type transformer is an important determinant of its service life. Caused by harmonic current on dry-type transformer, the additional loss causes additional temperature rise of its internal components. Meanwhile, additional temperature rise will lead to accelerated thermal aging of insulation materials, which further damages the external insulation performance of dry-type transformer windings. Firstly, the harmonic losses of dry-type transformers under different distortion rates are calculated by using the harmonic loss factor. Secondly, calculated by using harmonic loss value, the load capacity of dry-type transformer is under different total harmonic distortion rate. Therefore, based on the above analysis, this paper proposes to reduce the additional temperature rise caused by harmonic loss by reducing the load capacity of dry-type transformer. What's more, this method can effectively control the temperature rise of the components in the dry-type transformer within the limits. Finally, the relationship between current distortion rate and load capacity of dry-type transformer is obtained by calculation. The results show that harmonic current can increase various loss values of dry-type transformer and reduce load capacity.

Energy efficient transformer

Transformer effect

10.1109/ei247390.2019.9061758

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Study on Harmonic Load Loss Calculation Method of Oil-Paper Insulated Distribution Power Transmission Equipment

Dai Wan Kai You Hengyi Zhou Fei Qi Simin Peng

At present, there are a large number of nonlinear electrical equipment in the power system, which leads to higher and higher harmonic components in the system. In addition, the large number of new energy access, such as photovoltaic, wind power and so on, also introduces large harmonic interference. Harmonic has a certain influence on the loss of distribution transformer in operation. Based on the principle of harmonic current acting on transformer, the winding resistance loss, winding eddy current loss and stray loss of distribution transformer under non-rated condition are analyzed in this paper. The load loss calculation model in the IEEE Std C57.110 is further revised. Based on the model established in this paper, the selected example transformer is calculated and analyzed. The accuracy of the calculation model established in this paper is verified by the analysis results. The larger the harmonic distortion rate and harmonic frequency, the faster the load loss of distribution transformer increases.

Energy efficient transformer

Harmonic Analysis

10.1109/ei247390.2019.9061866

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Design and Analysis of Key Equipment for Large Capacity Power Systems

Lecture notes in computer science (2025)

Dai Wan Haibo Wang Hu Guan Zhanfeng Zheng

10.1007/978-981-96-0780-8_6

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Study on Temperature Rise of Solid Insulated Energy Transfer Equipment under Harmonic Actions

Dai Wan Miao Zhao Fei Qi Hengyi Zhou Simin Peng

Dry-type transformer adopts solid insulation structure, which is widely used in residential areas, basements and other densely populated areas. Compared with oilimmersed transformer, dry-type transformer has a higher security. With the adjustment of power grid structure, a large number of non-linear loads are connected to the power grid. Harmonic pollution has become an important factor affecting the normal operation of power equipment. In this paper, the temperature rise of solid insulated energy transfer equipment under harmonic actions is studied. Firstly, the load losses calculation model of dry-type transformer is established by analyzing the action mechanism of harmonic interference on each component. Secondly, the simulation model of temperature field distribution of dry-type transformer is established. Finally, combined with load loss calculation model and temperature field distribution simulation model, the actual operation of transformer is calculated and analyzed. The results show that the additional temperature rise caused by harmonic losses is mainly concentrated on windings and insulating resins. Moreover, if the dry-type transformer operates under the condition of serious current distortion for a long time, the aging of insulation material will accelerate and the insulation performance of transformer will be reduced.

Energy efficient transformer

Transformer effect

10.1109/ei247390.2019.9061739

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Measurement Method of Verdet Constant Based on Refractive Index Dispersion of Optical Fiber Current Sensing Materials

Fei Qi Dai Wan Miao Zhao Hengyi Zhou Xujin Duan

With the rapid development of ubiquitous power internet of things, people put forward higher and higher requirements for the informationization level of power equipment. Optical fiber current sensor has a very high level of information technology, so it attracts the attention of scholars. However, the existence of linear birefringence in optical materials and its low sensitivity to current and magnetic fields have always been the main reasons that restrict optical current sensors. The Feldt constant of optical fiber current sensor material characterizes the responsiveness of optical material to Faraday effect, which is closely related to the measurement sensitivity of all-optical fiber current sensor. The traditional method of measuring the Feldt constant is to calculate the Feldt constant by measuring the Faraday magneto-optical deflection angle. This method will be affected by linear birefringence and other factors, so that the measurement results are lower than the actual values. Based on the principle of frequency dispersion in refractive index light, a spectrophotometric method is proposed to measure the Verdet constant of optical materials. Compared with the traditional methods, the results show that the proposed method can avoid the influence of linear birefringence and other factors, and has guiding significance for improving the measurement sensitivity of optical fiber current sensor.

Verdet constant

Optical power

Optical Isolator

Current sensor

Faraday cage

Optical time-domain reflectometer

10.1109/ei247390.2019.9062147

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Typical case analysis of distribution cable fire fault

Dai Wan Weihua Zhou Fei Qi Hengyi Zhou Miao Zhao

Power cable undertakes the important task of power transmission. In recent years, the use of power cables is increasing, and its safe and reliable operation is very important to ensure the stable operation of distribution system. However, the cable is deeply buried in the ground, so it is difficult to find the problem in time and reliably in ordinary daily inspection. In recent years, the number of cable faults has increased greatly, and the fire failure caused by the explosion of cable intermediate joint accounts for more than 80%. Taking a typical large-scale fire accident of distribution cable as an example, this paper deeply analyzes the prominent problems existing in the installation process of cables and accessories, line protection configuration, operation and maintenance of cable operation environment. The case has high learning value and significant guiding significance. It basically covers the prominent problems in technology, process and management of current distribution cable. Through in-depth analysis of the case, targeted and reliable solutions are proposed, which can effectively improve the operation level of distribution network.

Power cable

Direct-buried cable

Power transmission

10.1117/12.2586787

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