bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Operation Reliability Evaluation of Power-generating Unit
Authors: Di Shuai 
Published: November 2021

Abstract
Objective and reasonable evaluation is the basis of power-generating unit optimal operation, but evaluation method based on single weight can’t adapt to the high accuracy requirement of comprehensive evaluation. In order to achieve the accurate evaluation of power-generating unit operating reliability, this paper firstly calculates subjective weight and objective weight of target attribute by analytic hierarchy process method and entropy weight method. It calculates the associated weight of target attribute by grey relational degree method, and it obtains the linear combined weight by relaxation factor. Then, the power-generating unit operating reliability is evaluated by improved TOPSIS (Technique for Order Preference by Similarity to an Ideal Solution), and the evaluation result is obtained. Finally, the relaxation factor is continuously evaluated from 0 to 1 to perform sensitivity analysis. This paper evaluates the operation reliability of nine wind turbines in a wind farm, and the evaluation result is closer to actual operation state of wind turbines. This method has high reliability and practical value, and it provides a new technical means for making a reasonable maintenance plan of wind turbines.
Starting System and Safety Protection of Explosion-proof Diesel Engine for Coal Mine Based on Compressed Air
Authors: Zhu Kun , Liu Jiquan , Yan Zhiwei , Zhang Lei 
Published: November 2021

Abstract
The starting and safety protection system is an important part ofthe explosion-proof diesel engine, and there are malfunctions in the explosion-proof diesel engine, such as difficulty in starting and failure in protection. As a gas working medium, compressed air is safe, reliable, and advantageous in acquisition and storage. Therefore, analyzing the starting principle and safety protection requirements of explosion-proof diesel engines and studying the correlation between the two systems, a set of starting and safety protection systemsusing compressed air as the working medium is designed in this paper. Moreover, the performance requirements of the main components in the system are studied, analyzing and calculating the operating parameters in the system, so that the design plan can be optimized. The problems appearing instarting and safety protection of explosion-proof diesel engines are solved through this system.
Simulation analysis of underwater working condition of ship rudder blade based on Fluent
Authors: Zhao Haowei , Liu Guifeng , Han Jianggui 
Published: November 2021

Abstract
The rudder blade is an important power plant of the ship. Removing damage and failure is the premise of the normal operation of the ship. In this paper, the numerical calculation method is used, combined with K-ɛ (k-epsilon model) and S-A (spalart allmaras) turbulence model, the underwater working conditions of ship rudder blade are analyzed, and the influence of water flow impact at different angles of attack on the damage failure of rudder blade components is discussed. The simulation results show that when the ship is sailing at constant speed, with the change of water attack angle, the main distribution range of rudder blade stress deviates, and the lift and resistance of rudder blade are also gradually increasing, which is easy to damage the parts with concentrated stress. It has theoretical guiding significance for the protection and repair of rudder blade damage.
Multistage noise reduction processing for vibration signal of hydropower units
Authors: Shi Yousong , Zhou Jianzhong 
Published: November 2021

Abstract
In actual field testing environments of hydropower units, unit vibration signals are often contaminated with noise. In order to obtain the real vibration signal, a multi-stage vibration signal denoise method SG-SVD-VMD is proposed for the guide bearing nonlinear and non-stationary vibration signals. And the root mean square error (RMSE) and signal to noise ratio (SNR) are used to evaluate the noise reduction ability of eight methods. The results show that the noise-canceling ability of this proposed method has improved to some extent. It can effectively suppress the noise of the hydropower units vibration signals. This method can effectively identify the shaft track and the running state of hydropower units.
Experimental PIV investigation of the PZT fans array coupling effect at high Reynolds numbers
Authors: Chen Yiyang , Ding Hao , Wang Ziwen , Li Jianxin , Cui Jiahuan 
Published: November 2021

Abstract
Piezoelectric fan arrays are being increasingly emphasized for heat dissipation in small-sized electronic devices. In this study, PIV experiments were conducted to investigate the flow fields induced by piezoelectric fan arrays with different vibration modes and pitches at high Reynolds numbers (324< Re <509) in a stationary air environment. As a result, when the PZT fan array is vibrating in-phase, the saddle points in the time averaged flow field are formed and separated gradually as the pitch increases, the remnant vortex and the induced vortex interact to form a jet with a periodic oscillation in the direction. Jet velocity reaches a maximum at P = 3A. In counter-phase vibration, saddle points are separated from one region under large pitches, the interaction of counter-rotating induced vortices forms a vertical upward jet. The morphology of induced and remnant vortices with different vibration modes and array pitches are responsible for the jet formation and flow field pattern. The interaction of counter-rotating vortices in counter-phase vibration leads the jet intensity higher than in-phase vibration induced jet, the optimal setting of the PZT fan under this study is determined as P = 2.5A with counter-phase vibration. The experimental results provide validation for the simulation study and give guidance to the application
Research on residual current warning technology based on big data analysis
Authors: Li You , Xia Chuanfu , Zhuang Yuan , Liao Baoquan , Huang Shuai 
Published: November 2021

Abstract
Residual current is the main cause of electrical fire. The traditional residual current monitoring methods often give delayed alarm, false alarm or even missed alarm, which cannot be applied in practice. This paper put forward the residual current detection solution based on big data analysis. The big data analysis based on residual current, temperature and humidity could detect residual current anomaly information as early as possible, realize fault monitoring and early warning. This method was applied to important facilities such as substation, data center. It could reduce or eliminate fire hazards, and provide decision basis for electrical fire warning.
Research on the Operation Model and Strategy of Lithium Battery to Provide Frequency Regulation in the Power System
Authors: Shi Yu , Zhang Zhong , Wang Jing , Li Hao , Zhao Xiang , Yang Xintong 
Published: November 2021

Abstract
With the development of smart grid and energy internet, energy storage will play an important role in maintaining the power balance and providing frequency regulation in future power system. Consequently, energy storage faces a trade-off problem between the energy market and frequency regulation market. In this work, an operation model and strategy of energy storage to provide frequency regulation is proposed. Taking lithium battery as an example of energy storage, its technical feasibility to provide frequency regulation is firstly discussed. Then, a day-ahead energy market model in the power system is constructed to calculate the revenue of lithium battery. Finally, the operation strategy of lithium battery to provide secondary frequency regulation (namely AGC) is proposed based on the model of opportunity cost. Case study is conducted on a modified IEEE 6-bus system. It shows that the reduced marginal revenue of lithium battery in the energy market increases with the growth of its declared capacity for frequency regulation. Consequently, the optimal declared frequency regulation capacity for lithium battery is the amount, at which the reduced marginal revenue in the energy market is equal to the compensation price of frequency regulation.
Research on Security Access of Power Internet of Things Terminals Based on Edge Computing Technology
Authors: Tang Yong , Zhang Linghao , Zhang Juling , Xiang Siyu , Cai He 
Published: November 2021

Abstract
In view of the current lack of unified security authentication and control for the power Internet of Things terminal equipment, at the perception level of the power Internet of Things, the perception layer terminal access control, front-end authentication technology realization and terminal equipment abnormal behavior detection methods are proposed. This method enhances the communication security between power equipment and edge nodes, and ensures the safe and stable operation of the power Internet of Things.
Simulation Analysis of Current in Metal Sheath of Power Cable Considering Temperature Characteristics
Authors: Fang Jian , Zhang Min , Mo Wenxiong , Huang Bo , He Jiaxing , Lin Xiang 
Published: November 2021

Abstract
This paper proposes a cable broadband circuit model considering the temperature characteristics. This paper establishes the equivalent circuit model of the cross-bonded power cable and proposes the broadband parameter calculation method considering the temperature. The cable parameters are calculated by the vector fitting method. Based on the operating current and cable temperature data of the cable on a certain day, the simulation analysis of the cable sheath current considering the temperature is carried out using Simulink. Finally, the simulation results show that the cable sheath current is significantly affected by temperature.
Design and electromagnetic analysis of switched reluctance linear generator in electric vehicle
Authors: Liu Jieyu , Tang Ye , Cheng Wenyu , Li Changpeng 
Published: November 2021

Abstract
The structural characteristics and basic design requirements of design of switched reluctance linear generator are introduced. According to the general principles and design experience of electromechanical design, the dimension of design of switched reluctance linear generator is determined, and the two-dimensional and three-dimensional static finite element models of design of switched reluctance linear generator are established in Flux 2D and Flux 3D respectively. By comparing the simulation results of the two-dimensional model and the three-dimensional model, it is found that the difference between the real simulation results of the 2D model and the 3D model is small, and the calculation time cost of the 2D finite element simulation is much lower than that of the 3D model. Therefore, the subsequent work of this paper adopts the 2D finite element model. Finally, the static electromagnetic field and electromagnetic characteristics of the design of switched reluctance linear generator are analyzed by finite element analysis.
Approach for Provincial distribution automation system in Outage analysis
Authors: Zhang Zhihao , Qian Yulin , Zhou Diandian , Zhang Kexin 
Published: November 2021

Abstract
People’s lives are becoming more and more inseparable from electricity, and the requirements for the quality of power supply are getting higher and higher. Because of most of the faults in the power system originate from the distribution network, the need to standardize the management of power outages and improve the efficiency of research and judgment has become more and more significant. However, in China, the differences in the development of automation construction in various places and the outage information of different departments require that power outage business applications should try to achieve accurate analysis of outage information under different scenarios. This paper designs a power outage analysis approach, which comprehensively analyzes distribution network data such as substations, lines, and meters, and establishes a signal credibility image, which flexibly mines and analyzes outage events from multiple dimensions and effectively improves the fault tolerance of fault location.
Design and implementation of active frequency control algorithm for virtual power plant based on flexible resource rapid response
Authors: Li Bin , Yu Junjie 
Published: November 2021

Abstract
At present, the power generation resources in the power system show a clean and decentralized development trend. These distributed generation resources are small in scale and lack of special regulation system. Aiming at the uncertain and intermittent output characteristics of photovoltaic distributed generation virtual power plant(VPP), this paper puts forward the scheme of active frequency response intelligent control, completes the hardware and communication design, algorithm design and software implementation. Finally, the actual engineering practice is carried out in three photovoltaic VPP in Zhongshan City, Guangdong Province, which verifies the feasibility of relevant schemes and algorithms, and provides a certain basis for the next research.
Frequency tracking and tuning control of wireless power transfer system
Authors: Liu Ziyi , Zhan Hao 
Published: November 2021

Abstract
A tuning control method with frequency tracking function is proposed to improve the degradation of efficiency caused by coil detuning in magnetically-coupled resonant wireless power transfer. Firstly, the detuning mechanism is studied by combining the AC impedance characteristics of the series resonant circuit, and the feedback control circuit is constructed by using a modified phase-locked loop, which outputs a variable frequency PWM wave to regulate the operating frequency of the high frequency inverter and maintains the phase difference between the inverter output voltage and the original side current within the error range. The Matlab/Simulink simulation results show that the design can successfully transfer the system to a new resonant state with short regulation period and high control accuracy, which can effectively improve the transmission efficiency and load power of the system.
Simulation Research on Electric Field Distribution of Insulator String in ULTRA High Voltage Transmission Line
Authors: Shen Weihao 
Published: November 2021

Abstract
Insulators are one of the important components of overhead transmission lines. Because of their excellent characteristics, insulators have obvious advantages in the selection of external insulation in UHV AC transmission projects. The potential distribution of insulator string is not even due to the shape characteristics of insulator string, the structure of metal tool, the low conductivity of silicon rubber material and the stray capacitance between insulator string and wire, iron tower and metal tool. When the surface field intensity of insulators and fittings exceeds the initial field intensity, corona discharge will occur, which will affect the electromagnetic environment and the operation characteristics of insulating materials. Therefore, it is of great significance to determine the potential distribution of insulator strings of UHV transmission lines for detecting low and zero value insulators, implementing voltage equalization measures effectively, and ensuring the safe and stable operation of transmission lines. Based on Ansys software of 500kv transmission line insulator string, this paper establishes a three-dimensional model, the method of using finite element numerical simulation respectively with no equalizing ring and equalizing ring in both cases the umbrella skirt on simulation, the distribution of electric field along the roots, and further studies the equalizing ring the effect of different parameters on the electric field distribution. Finally, an optimal solution is established.
Application of Automatic Code Generation Based on PSIM in Digital Control BUCK Circuit
Authors: Lu Yang , Yang Puqiong 
Published: November 2021

Abstract
In recent years, digital control has been widely used in the field of power electronics. Automatic code generation, as a graphical software writing method, has brought great convenience to the writing of electronic control software due to a series of advantages such as easy to write and easy to simulate and verify. Simcoder in PSIM is an automatic code generation software that enables the automatic generation of complete DSP control program projects. In this article, the current and voltage loops of a typical average current controlled BUCK circuit are designed as an example, and the use of PSIM and Simcoder is described in detail. Based on the main circuit and Matlab parameter calculations, the model is simulated and the self-generated code is downloaded into the TMS320F28335 to test the output voltage and current of the hardware circuit. The circuit output has the advantage of stable output voltage with small steady-state error and low voltage overshoot, demonstrating the practicality and efficiency of automatic code generation on this project.
Design of vision system for high voltage transmission line obstacle Removal Robot
Authors: Wu Yijiang , Dong Zhicong , Zhou Huibin 
Published: November 2021

Abstract
Aiming at the problem of low visual co direction rate of high-voltage transmission line obstacle Removal Robot in traditional system, a new vision system of high-voltage transmission line obstacle removal robot is designed. In the hardware part of the system, the storage structure of DSP, TMS32DC541Q and image sensor are designed; at the same time, through the visual foreign object recognition of high-voltage transmission line obstacle removal robot, the visual image threshold of high-voltage transmission line obstacle removal robot is calculated, the visual judgment of high-voltage transmission line obstacle removal robot is realized, and the system design is completed. The experimental results show that compared with the traditional vision system, the designed vision system of high-voltage transmission line obstacle Removal Robot effectively improves the degree of the same direction with the original image and meets the practical application requirements.
Pulse interference identification and suppression for OFDM signal
Authors: Wei Wei , Peng Tao , Ye Li 
Published: November 2021

Abstract
The new generation smart meter is the core node of information acquisition and flows in the power Internet of Things (IoT). Because it is powered by the low-voltage power line, various short-time pulse interference signals in the line can be easily coupled to the received signal of the communication module embedded in the meter, resulting in the degradation of communication performance. In view of this situation, an identification-suppression algorithm of the short-time pulse-interference signal is proposed. The core idea is to comprehensively judge the existence of the interference signal and its specific position in the time domain based on the energy ratio of adjacent OFDM symbols and the change of mean square error value between frequency domain amplitude signals. Based on this, an interference energy elimination scheme with an adaptive threshold is realized. Theoretical analysis and simulation results show that the scheme has low computational complexity, high accuracy of pulse interference identification and position judgment, and can effectively reduce the energy of pulse interference signal, and thus improving the decoding performance of OFDM while it receives signals.
Design of Synaptic Neuronal Circuit Based on Memristors
Authors: Ma Lin , Tong Yi , He Lin 
Published: November 2021

Abstract
To solve the problems of poor learning efficiency and low accuracy caused by the single fixed synaptic weight in the traditional artificial neural network. On the foundation of the improved memristor model, this paper designs a synaptic neuronal circuit based on the natural memory characteristics of the memristor. This synapse is composed of six memristors. The resistance of the memristor is changed by adding a periodic square wave to update the synaptic weight. This circuit can realize signed synaptic weighting, which has certain linear characteristics. Finally, two synaptic weight update methods are proposed based on this circuit, and the validity of the design is verified through Spice simulation experiments.
Research on real time simulation modeling method of large scale MMC electromagnetic transient
Authors: Wang Lei , Zhang Hongjun , Hu Hui , Hao Liping , Xu Wei 
Published: November 2021

Abstract
Modular multilevel converter (MMC) contains a large number of power electronic switching devices. The modeling method based on switching circuit model needs a lot of resources and the simulation speed is slow, so it is difficult to realize large-scale real-time simulation of electromagnetic transient. A MMC electromagnetic transient numerical modeling method based on ideal transformer model (ITM) is presented. Firstly, the MMC system is divided into the main circuit network and the sub module group network by ITM method, and the error caused by decoupling delay in serial and parallel real time simulation is compensated respectively by interpolation prediction and advanced interpolation prediction. Secondly, the capacitor in sub module is discreted respectively by trapezoidal integration method, backward Euler method and Gear-2 method. Based on the above numerical integration, the difference equations of capacitance voltage, capacitance current and output voltage of half bridge and full bridge sub modules are derived. Then, in order to improve the calculation speed, a simplified numerical model of half bridge and full bridge sub module based on switching function is proposed. Finally, the MMC based on switching circuit model runs off-line simulation in the simulation software, and the above MMC numerical modeling method runs real-time simulation in Speedgoat real-time simulator. The off-line and real-time simulation results of the MMC numerical modeling method and the switching circuit model are compared. And the simulation results verify the feasibility and effectiveness of the above MMC numerical modeling method in real time simulation.
Remote monitoring system design of power substation based on GPRS
Authors: Xiong Yicheng , Liu Qian , Deng Maojun , Niu Zhilei 
Published: November 2021

Abstract
This paper studies the design scheme of a substation remote monitoring system based on GPRS, and gives the solution about poor real-time and imperfect function of centralized substation monitoring system. The working principle diagram of the measurement and control device is introduced in detail, and the modules of analog acquisition and switching input are designed. The substation remote monitoring software based on GPRS communication is developed to realize the remote real-time monitoring of electrical and switching parameters and other functions, such as data query, fault early warning and energy efficiency analysis. The experimental results show that the system has the characteristics of real-time, multi-function and high reliability. It is of great significance to implement defensive maintenance, improve power supply quality, save energy and reduce consumption.