bluuebunny/crossref_metadata_2025_split huggingface dataset:
Voltage Variation of Smart Grid with Distributed Power
Authors: Zhang Bowen 
Published: June 2020

Abstract
In order to solve the voltage regulation problem of the smart grid with distributed power. A convergence power flow program suitable for DG-containing systems based on Newton algorithm was written. The result was that Type-A DG will reduce the voltage level, while Type-B and Type-C DG will support the system voltage level. In the simplified modeling and analysis method of distribution network, triangular load distribution model is better than uniform load distribution model. The effect of DG on the voltage distribution on the feeder is closely related to the total capacity and access position of DG.
Power System Frequency Regulation Based on Vehicle-to-Grid
Authors: Zhang Bowen 
Published: June 2020

Abstract
A static frequency characteristic model of electric vehicle charging and discharging was established, and a corresponding strategy is proposed to realize the role transition of electric vehicle between distributed generation and controllable load. Load frequency control models for single-area and two-area interconnected power systems are established. Simulation studies show that electric vehicles can not only effectively improve the frequency stability of the power system, but also significantly reduce the reserve capacity of traditional frequency modulation units.
Coordinated control of energy storage electric brake device and generator
Authors: Li Xiaocong , Meng Hongpei 
Published: June 2020

Abstract
The application of Super Capacitor energy storage Brake Device (SCBD) in the electrical braking system of Hydrogenerator can not only assist the rapid shutdown of hydrogenerator, but also significantly provide the ability to resist large disturbance of the system, which is conducive to the improvement of the transient stability of the system. Based on the principle of capacitor energy storage, the differential algebraic model of SCBD and generator excitation and speed regulation system is derived in this paper, and the multi index nonlinear control is used to design the coordinated controller. In order to verify the effect of SCBD on generator system, three-phase short circuit simulation with and without SCBD and voltage regulation disturbance simulation are carried out. The simulation results show that the SCBD braking effect is obvious and the transient stability of the system is improved significantly.
Research on large-scale intermittent new energy grid connected control technology based on power demand
Authors: Wang Juanjuan , Jia Yajuan , Nan Jiangping 
Published: June 2020

Abstract
In recent years, with the increasing Power demand, new energy power has been continuously developed. As the main types of new energy power generation, wind power and photovoltaic power generation have strong randomness and correlation under the influence of natural conditions. The safe and efficient utilization of large-scale new energy power is the core content and basic goal of smart grid construction, while intermittent new energy is developing rapidly, there are also many problems. New energy resources and load centers show obvious reverse distribution characteristics. The fundamental reason that hinders the large-scale absorption of intermittent power in power grid lies in its randomness and volatility. It is necessary to study advanced prediction technology and control technology and make dynamic changes according to certain laws. The structure design of the new energy system of the large power grid can ensure that the power of wind, solar and other new energy can be connected to the grid to the maximum extent, the mathematical parameters and control strategies are correct and reliable, and the energy storage system can realize the dynamic tracking interaction with the power of the large power grid.
Design Optimization of Improved Halbach Tubular Permanent Magnet Linear Synchronous Motor with Less Permanent Magnet
Authors: Li Qinghui , Liu Xu 
Published: June 2020

Abstract
To reduce the permanent magnet (PM) usage and cost, the improved Halbach tubular permanent magnet linear synchronous motor (IH-TPMLSM), which has unequal thickness of the radial and axial magnetized PMs located in the mover, is developed in this paper. Taking the maximum average thrust as the optimization objective, the single-step optimization method based on sensitivity analysis is used to optimize motor under the same current density by finite element (FE) analysis. The influence of the pole-pitch τ on the detent force is analyzed. According to the comparison of optimized TPMLSMs, the results show that when pole-pitch τ = 30.5mm and the full-pitched winding disposition τs = 31.5mm, the detent force is reduced by 55.87%. Finally, the open-circuit back EMF, air gap flux density, the thrust of the IH-TPMLSM and the quasi Halbach TPMLSM (QH-TPMLSM) are compared. The quantity of PMs of the IH-TPMLSM is 15.27% lower and the average thrust is 4.01% higher than that of QH-TPMLSM. Meanwhile the thrust ripple is reduced by 36.12%.
Research on Dynamic Hybrid Compensation Technology and Device in Low Voltage Distribution area of Transformer
Authors: Xie Yejun , Wang Ling , Li Peng , Li Tao , Su Xin 
Published: June 2020

Abstract
In order to solve the problem of three-phase unbalance and low power factor caused by distributed power supply to low-voltage distribution network, a hybrid reactive power compensation system based on “intelligent capacitor +SVG” is designed. The system is composed of a small capacity Static Var Generator (SVG) with high precision compensation and several smart capacitors. Firstly, the structure of three-level SVG in the hybrid compensation system is analyzed, and the two-level SVPWM vector synthesis method is applied to three-level compensation. The control mode of intelligent capacitor is analyzed. Then the principle of reactive power distribution in hybrid compensation system is analyzed. Finally, a hybrid reactive power compensation system is designed with TMS320F28335 as the core controller of the hybrid system. The experimental results show that the hybrid reactive compensation system can effectively compensate the reactive current dynamically.
Control Strategy and Application of Voltage Sag Compensation Based on UPQC
Authors: Jiang Xiangdong , Wang Ling , Zhao Qingyuan , Su Zongyu , Li Tao 
Published: June 2020

Abstract
In order to solve the problem of voltage sags in low-voltage power grid, the control strategy and application of Unified Power Quality Controller (UPQC) are given. Based on the main circuit of UPQC, the method of Second-Order Generalized Integral (SOGI) is used to detect the voltage drop quickly and accurately, and the direct control method is used to compensate the voltage drop. The method is simulated by PSCAD/EMTDC, and the theoretical results are verified. TMS320F28335 controller is used to realize the algorithm, and a physical platform is built. The test waveform verifies the feasibility of the method.
Creating Appropriate Trust in Automated Valet Parking System
Authors: Ma Jun , Feng Xuejing , Gong Zaiyan , Zhang Qianwen 
Published: June 2020

Abstract
To improve the user experience of autonomous driving, human factors issues regarding automated driving need to be addressed. One of the key issues is how much drivers trust in automated driving systems and how they generate trust and reliance based on their experience. This paper aims to investigate how an appropriate level of user trust for automated valet parking system can be created via human-machine interaction (HMI). For example, trust formation is a dynamic process. When users interact with the system, the factors that affect trust will change with the change of context. In order to understand how factors related to trust interact, we designed two projects by modulating four design variables, which are the ease of use, anthropomorphism, transparency of feedback, and communication style. We measure their trust level and satisfaction and provide some design suggestions for creating appropriate trust in the automated valet parking system.
Study on the Identification of the Differential Lasso in the Low-voltage Transformer Area
Authors: Wang Yi , Liu Zhitong , Li Yuanyi , Pang Bo , Zhao Nan , Liu Jia , Shi Diancai , Hou Gang , Wang Qi , Zhao Chuanzong , Wang Qinghao 
Published: June 2020

Abstract
The validity of the transformer area’s file in the Power information acquisition system is very important, the man-made way is time-consuming, and the cost of relying on the equipment is high. In order to provide efficient, convenient and economical identification technology of the transformer area archives, this paper proposes a low voltage topology recognition method based on differential Lasso, which can complete automatic topology recognition only by using the power consumption information of the transformer area. First of all, the statistical model of Lasso is established for the data of electricity consumption. According to the characteristics of the meter in the meter box belonging to the same area, the differential Lasso model is further constructed. The regression coefficient based on the differential lasso can be calculated for each transformer area in turn by polling, and select the meter according to the threshold. The method of this paper is used to analyze the field collected electricity data. The results of topology recognition show the effectiveness of the proposed method.
Overheating Fault Analysis of Electromagnetic Unit in 220kv Capacitive Voltage Transformer
Authors: Xu Jianchun , Sui Wei , Song Yebin , Yang Xiaolei , Han Lu , Zhang Zhao , Tao Shuyi , Lin Yuan , Zhao Chuanzong , Zhang Hua , Wang Qinghao 
Published: June 2020

Abstract
This paper introduces the structure and principle of capacitive voltage transformer, the overheating caused by the failure of the electromagnetic unit on 220kV capacitive voltage transformer in operation is analyzed, it is based on infrared detection technology, combined with the method of power outage diagnostic test for joint fault diagnosis, the diagnostic results are accurate and reliable, some suggestions on field detection and fault diagnosis of capacitive voltage transformer are put forward.
Research on Optimal Design of Plug-in Hybrid Electric Vehicle Charging Based on Smart Grid
Authors: Wang Zhen , Chen Nuo , Guo Yanan 
Published: June 2020

Abstract
Plug-in hybrid vehicle charging piles are an important part of the smart grid, and electric vehicles are also an important means of alleviating energy shortages and environmental degradation. This article analyzes the influencing factors from three factors that determine the charging power. Finally, the charging power, charging demand and charging time are determined one by one to model the charging load of the electric vehicle. For the working frequency range of different equivalent resistances, wireless charging PID controller, battery charging state analysis, the equivalent resistances of different stages of the battery are studied, and the transmission efficiency of wireless charging technology is optimized, so that the transmitting mutual inductance coil is opposite to the receiving coil The offset is minimized to maximize the charging efficiency and simulations are performed. Simulation results from the final wireless charging technology of the car show that the wireless charging technology has a better effect.
A microgrid scheduling method based on Evolutionary Game
Authors: Xu Yue , Yan Xuefeng 
Published: June 2020

Abstract
In order to solve constrained scheduling problem in microgrid. A micrgrid scheduling method based on evolutionary game is proposed in this paper. Further more, a renewable energy and traditional energy generators group with different cost functions was studied as an example. The results show that evolutionary game method proposed in this paper has higher accuracy and stability than the existing artificial fish swarm optimization algorithm (AFS). In the scheduling model of microgrid, the optimized cost of power supply has been reduced by 2%.
Research on Pressure Stability Control of High-pressure Common Rail System Based on Differential Equation Optimization Model
Authors: Xu Jianping , Hu Hongming , Chang Wanfeng 
Published: June 2020

Abstract
To improve the accuracy of fuel injection in high-pressure common rail systems of diesel engine, a mathematical model based on differential equations was established in view of the process of fuel entering and ejecting the common rail pipe, and the pressure variation law under working condition in the common rail tube was simulated in this study. Aiming at reducing the fuel pressure fluctuations in the system, the optimal angular velocity of the cam in high-pressure pump is solved by binary search algorithm, and the optimal control strategies for maintaining the dynamic and stability of pressure are given as well. Numerical simulation results show that with the presented strategies precise control of the pressure can be achieved in the common rail system, helping to improve the efficiency of the diesel engines.
Analysis of the Generation and Weakening of Cogging Torque in Interior Permanent Magnet Machine
Authors: Sun Tao , Dai Ying , Wang ZiTeng , Liu WanQiu 
Published: June 2020

Abstract
The permanent magnet of interior permanent magnet motor is inside the rotor. Compared with the surface-mount permanent magnet motor, its equivalent air gap is small and the cogging torque has a great influence. In this paper, the cogging torque of interior permanent magnet synchronous motor is analyzed and deduced by the energy method. Taking the 48-slot/8-pole interior V-type permanent magnet synchronous motor as the research object, the influence of the axial segmented skew of the permanent magnets, the width of the stator slot and permanent magnets segmentation on the cogging torque was analyzed by the finite element method. Studies have shown that the reasonable selection of the above three methods can effectively weaken the cogging torque of V-type interior permanent magnet motor.
Design of Central Controller for EAST ECRH System Based on FPGA
Authors: Yong Yang 
Published: June 2020

Abstract
Electron cyclotron resonance heating is one of the important heating methods for controlled nuclear fusion reactions, which can make up for the shortcomings of the traditional heating methods. To this end, a 4MW long pulse electron cyclotron heating system was designed on the Experimental Advanced Superconducting Tokamak device. This paper mainly introduces the design of the gyrotron controller of ECRH system based on FPGA chip. The control logic of the central controller is based on state machine. Throughout the entire control process, each signal in the system is monitored in real time. Once an abnormality occurs, the main control logic will cut off the high voltage power of the gyrotron as required to protect the gyrotron from damage. In addition to the normal control logic, the FPGA also embeds abnormality diagnosis logic, which monitors the control state transitions of the main control logic and various input signals in real time to determine whether an abnormality has occurred in the system and can diagnose the cause of the abnormality. Timing simulation was done to the FPGA program. The result shows that the controller can respond to the total control trigger signal in real time, accurately control the switching of the cathode and anode high voltage power supply, diagnose and handle various abnormal conditions, and meet the control requirements of the ECRH system.
A bilinear robust state estimation method for electric thermal integrated energy system
Authors: Yang Xiaonan , Sun Bo , Han Feng , Lang Yansheng 
Published: June 2020

Abstract
A bilinear robust state estimation method for electric thermal integrated energy system (IEHS) is proposed. First, the linear weighted least absolute value (WLAV) model of IEHS is constructed by introducing auxiliary variables, and then the state variables are estimated by solving a quadratic programming model with a nonlinear transformation. The advantage of the proposed method is that it has a high calculation efficiency. The effectiveness of the proposed method is verified on the IEHS test system.
Design and output characteristic analysis for power head of truck-mounted drilling rig
Authors: Chang Jianghua , Zhang Yang , Tian Honglinag , Lu Feifei , Fan Dong , Zhou Zujie , Liu Qingxiu 
Published: June 2020

Abstract
Truck-mounted drilling rig is an important equipment for coalbed methane drilling construction, and the power head is one of the main actuators for truck-mounted drilling rig which has significant influence on technical feature of drilling rig. Now the power head of the rig is mostly driven by the motor + gear reduction unit to drive the main axle, the load change with the time, which had more influence on the rotation circuit. At the basis of analysis on load characteristics, a hydraulic control system with two-pump and two-circuit control was designed. The dynamic analysis model of the system is established, and the output characteristics of the system under no-load starting and on load starting are analysed. The analysis results show that: the response time of no-load starting pressure is 0.3s, the response time of on load starting pressure is 0.9s, the greater the load, the longer the response time; the output speed of the system reaches 120 r/min in the stable state.
Basic Event Probability Determination and Risk Assessment Based on Cause - Consequence Analysis Method
Authors: Xin Baoquan , Wan Lu , Yu Jianliang , Dang Wenyi 
Published: June 2020

Abstract
Reasonable determination of the probability of occurrence of basic events is the basis of scientific risk assessment. The cause-consequence analysis method developed from the theory of system reliability is an effective method to determine the probability of basic events. Taking the motor overheating event as an example, based on the reliability theory of human and machine, from the perspective of “safety control system for the occurrence and development of motor overheating fire event”, the “motor overheating safety control system” is determined as the target system. Through the investigation and analysis of the functional composition of the target system, the reliability block diagram of the target system is obtained. And the logical relationship of link events is determined. According to the reliability theory, the probability of each basic event is investigated and calculated. Finally, the risk assessment diagram of motor overheating is obtained. The results show that the equal risk line in logarithmic coordinate is a straight line. This line is the critical line of acceptable risk. This research solves the problems of the current cause effect analysis, such as the unclear choice of the target system, the confusion of the logical relationship between the link events and the unclear source of the basic data. The study of quantitative analysis details based on reliability theory improves the operability and application effect of cause consequence analysis method, which is helpful for its popularization and application.
Research on the Difference Significance of Test Score by SAS
Authors: Gao Huameng , Xue Yong , Sun Yu , Wang Jing 
Published: June 2020

Abstract
In order to research the significancy level and difference in different groups of test score data, the way for checking data’s normal character is introduced. In order to realizing variance analysis, t test and Wilcoxon test, the SAS function, such as SORT, UNIVARIATE NORMAL, TTEST COCHRAN and NPAR1WAY WILCOXON are presented. According to real data, the distribution histgraph, X2 values, normal test, signed-rank test, and Wilcoxon two-sample test are gained. The study in this paper can be adopted in other fields of test design and data analysis.
Coordinated Control Strategy Based on MMC and DFIG
Authors: Zhao Xiaomin , Yang Bingyuan 
Published: June 2020

Abstract
The AC-DC hybrid distribution network based on modular multilevel converters (MMC) is beneficial for receiving distributed generation (DG), energy storage devices and DC loads. Therefore, the coordinated control of MMC and DG is very important for its safe operation. In this paper, doubly-fed induction generator (DFIG) are used as DG, and the control strategies of DFIG and MMC systems are analyzed. The system modeling research is carried out on a real time digital simulator (RTDS) platform. Then based on MMC control, an improved adaptive Crowbar circuit is proposed to improve inverter AC system low-voltage ride-through (LVRT) capability. The results show that the coordinated control strategy can better compensate the reactive power of the system to achieve LVRT, and verify the effectiveness of the control strategy adopted by the converter station.
Design of Intelligent Partial Discharge Inspection System for Distribution Equipment Based on Internet of Things
Authors: Dai Jianzhuo , Jia Yongyong , Liu Yang , Yang Jinggang , Qin Jianhua , Yuan Dong , Liu Dandan 
Published: June 2020

Abstract
With the rapid development of information communication, the Internet of Things and other technologies, the distribution network has evolved from a single power network to intelligent information integration. Due to the characteristics of large-scale distribution network equipment, scattered deployment, and complicated operating environment, the operation and maintenance work has problems such as low working efficiency and severely insufficient measurement coverage. Based on this, this paper adopts the system architecture of cloud, pipe, edge, and end to design an intelligent inspection system for partial discharge of power distribution equipment. The system is mainly based on intelligent sensing and supplemented by mobile detection. It integrates advanced technologies such as intelligent sensing, big data analysis, wireless communication into all aspects of distribution network inspection, so as to realize intelligent sensing, data fusion analysis and fault alarms of distribution network, guide defect elimination work in time, and provides technical support for status maintenance and safe operation of distribution network equipment.
Temperature field simulation of medium and low voltage composite cable
Authors: Xiong Yiyong , Zhao Jinghong , Guo Guoqiang 
Published: June 2020

Abstract
This paper introduces the basic principle of calculating the temperature field of composite cable based on finite element method, and simulates the rated, short-circuit and overload conditions of the cable, and explains the situation of the temperature rise of the cable. The cable resistance is analyzed and calculated. In this paper, the temperature field of the composite cable is systematically studied by means of simulation, and the design conformity of the cable is verified.
Adaptive Proportional Complex Integral Control Strategy of Three-Phase Grid-connected PV Inverter
Authors: Teng Fuyao , Lou Yichuan , Chen Min 
Published: June 2020

Abstract
The performance of conventional controller of three-phase grid-connected inverters possibly deteriorate during grid frequency drift. In this paper, an frequency adaptive proportional complex integral (PCI) controller with frequency locking loop (FLL) was proposed, the FLL was utilized to adjust the resonant frequency of PCI automatically, and the zero current steady error was achieved by PCI controller. The validity of the proposed control scheme was demonstrated through results of simulation and experimental.