bluuebunny/crossref_metadata_2025_split huggingface dataset:
Measurement and Analysis of abnormal noise of 10kV switch Cabinet
Authors: Chen Wei , Wu Xiaowen , Hu Sheng , Cao Hao , Xie Yine , Lu Ling 
Published: March 2020

Abstract
When the load current flows through the main row of the switch cabinet, the induction current is generated on both sides of the cabinet, and the electric power of the interaction between the bus and the panel appears. Because of the thin switch cabinet panel and double-layer plate structure, when the load current is large, the double-layer panel vibrates violently and collides with each other under the action of electric power, and then resulting in abnormal noise. It may lead to hidden danger of equipment safety for long time. In this paper, acoustic imaging technology is used to accurately locate the sound source, and then the vibration acceleration amplitude is measured by the vibration sensors. Based on its spectrum characteristics analyse result, the causes of abnormal noise are discussed and solutions are put forward.
Design of noise Control Scheme for 500kV Substation
Authors: Hu Sheng , Chen Wei , Wu Xiaowen , Xie Yine , Tang Qi , Lu Ling 
Published: March 2020

Abstract
The noise of substation is generally generated by the main transformer, reactor, capacitor and other electrical equipment, in which the transformer is the main sound source equipment. Its spectrum characteristics are mainly low frequency noise, medium and high frequency noise as auxiliary. The noise band is wide, the wave grow is long, the attenuation is slow, and the penetration ability to the building structure is strong, which seriously affects the daily life of the residents. In this paper, the noise source of a 500kV substation with noise exceeding the standard is tested and analyzed first, then the noise reduction scheme design and sound field simulation calculation are carried out to verify the feasibility of the scheme.
Critical Section Channel Maintenance Evaluation Method for Double HVDC Feed-in Grid
Authors: Xie Yan , Liu Yi , Gao Kun , Xiong Haoqing , Rao Yufei , Huo Qidi , Chen Meng , Tang Xiaojun 
Published: March 2020

Abstract
In order to ensure stable operation of DC, the dual DC feed grid structure needs to ensure a certain grid strength, but it is necessary to study how to evaluate the impact of critical section maintenance on the AC system. Firstly, the strength evaluation index of the receiving power grid is analyzed. Secondly, an index that characterizes the effects of two DC couplings is proposed. Finally, a critical section channel maintenance evaluation method for double ultra-high voltage DC feed grid is proposed. The effectiveness of the proposed method is verified by the HN Power Grid simulation.
Research on ship electric propulsion
Authors: Jin Zhemin , Yang Yuxin 
Published: March 2020

Abstract
Ship electric propulsion is widely favored in the marine industry due to its good economics, maneuverability and low noise. The modeling and simulation research of the ship’s electric propulsion system is carried out, and the steady state and dynamic working process of the system are reproduced. The inherent laws of the system are revealed, which is of practical significance for guiding the design and use of the ship’s electric propulsion system. The ship’s electric propulsion system is a complex and variable nonlinear system. In addition, its propulsion motor has the characteristics of large capacity and large moment of inertia. It is very important to accurately model and simulate it. The main content of this paper is the systematic research and development prospects of marine electric propulsion systems.
Research on Economic Dispatch Optimization Model of Small Hydropower Group Considering Power Supply Cost
Authors: Liu Fei , Zhang Haining , Sun Yaling , Wang Yongli , Tian Xu 
Published: March 2020

Abstract
Due to the large number of scattered small hydropower, disordered grid connection, unplanned power generation, and old equipment overvoltage, etc. It has brought great challenges to the power supply security of Sichuan Power Grid. Aiming at the minimum system power supply cost, the economic dispatch optimization of small hydropower groups within the system is realized. The nonlinear mixed integer 0-1 programming is solved by adaptive simulated annealing genetic algorithm. The results show that the total cost of power generation after the optimized power generation plan. It is lower than the cost of all the power stations in the flood season, further indicating that the scheduling optimization can effectively reduce the system power supply cost, and guide the Ya’an small hydropower group. Economic dispatch is of great significance.
Vibration Signal Analysis of Rotating Machinery Based on Manifold Learning
Authors: Wang Hao , Zeng Yuyun , Xie Guangyao , Wang Xiaoshang , Liu Jingquan 
Published: March 2020

Abstract
Vibration signal contains the fault information of rotating machinery, so it can be selected to monitor the health status of rotating machinery and provide an early warning. But vibration data of rotating machinery usually has the characteristics of large amount of data and non-linearity, and traditional data processing methods are difficult to analyze effectively. Therefore, in this paper, based on the statistics and wavelet packet decomposition, the time-frequency domain characteristics of the signal are extracted. And then the feature set that can characterize the running state of the rotating device is selected according to the Pearson correlation coefficient. At last, the manifold learning method is used to calculate the feature set. The result shows that this method can effectively monitor the running state of the rotating machinery.
Study on the economic analysis model of new energy power generation under the form of grid parity
Authors: Tian Xu , Zhang Yvli , Che Yanying , Wang Yongli , Zhang Jun 
Published: March 2020

Abstract
This paper first analyzes the influencing factors of the economy of new energy power generation under the situation of grid parity, then studies the economic analysis method based on the internal rate of return, and establishes the calculation model of the economic analysis of new energy power generation. Finally, taking the economic calculation of wind power field and photovoltaic power station in 2020 as an example. This paper studies the IRR of new energy power generation projects in different regions under parity conditions. On this basis, the paper analyzes the key issues of new energy development scale, development layout, operation consumption, market competition and so on under the situation of grid parity, and studies and judges the development trend of new energy in China in the future.
A Simplified Predictive Control Method of Power Frequency Electric Field on Roof near 500 kV Transmission Lines
Authors: Huang Mingxiang , Wang Yifei , Bian Hongzhi , Yang Dongyang 
Published: March 2020

Abstract
In order toget a simplified predictive control method of power frequency electric field on roof near 500 kV transmission lines, a three-dimensional electric field simulation model including the lines, tower and house isestablished based on the finite element method. Based on the knowledge that obtained from existing studies, the spatial distance between the house and the transmission line is the main factor affecting the power frequency electric field intensity on the roof. Therefore, the spatial distance is determined as a variable, and the least squares method is used to fit the optimal electric field distribution function. A simplified prediction model of the power frequency electric field at fixed monitoring point on the roof near the transmission line is derived. The results show that the fitting function of the third-order polynomial can achieve better predicting effect. The specific mathematical expression of the prediction model is provided.A deductive process of the application of the proposed method is given. The proposed power frequency electric field predictive control method can provide reference for the planning, design and environmental impact assessment of transmission line projects.
Adaptive Neural Fuzzy Petri Net Algorithm for Motor Fault Diagnosis
Authors: Wang Changan , Li Jiming , Zhu Xiaolin , Xu Chuannuo , Cheng Xuezhen 
Published: March 2020

Abstract
This study aimed to improve the application of fuzzy Petri net to fault diagnosis of motor systems. An adaptive Neural Fuzzy Petri Network Algorithm based on the traditional Petri net theory, fuzzy theory, and neural network algorithm is proposed and applied to the diagnosis of motor faults. The transition confidence is replaced by a Gaussian function to solve the uncertainty of fault propagation. Combined with the BP neural network, fault diagnosis parameters are adaptively trained. Finally, the Neural Fuzzy Petri Net Algorithm is applied to the fault diagnosis of a three-phase asynchronous motor, considering its fault operation mechanism and fault characteristics. The results show that the algorithm can diagnose the fault of the three-phase asynchronous motor with satisfactory accuracy and adaptability.
A data driven health assessment model for high pressure output pumps in LNG terminals
Authors: Zeng Yuyun , Wang Xiaoshang , Xie Guangyao , Liu Jingquan 
Published: March 2020

Abstract
High pressure output pumps are critical equipment in the vaporization and output system of LNG terminals. Health management helps improve efficiency and reduce cost of the maintenance of high pressure output pumps, thus guaranteeing the efficient productivity of LNG terminals. In order to develop health management system for high pressure output pumps, a data driven health assessment model based on online condition monitoring data of the pumps is proposed. Time domain and frequency domain features are extracted from the monitored vibration signal by statistical analysis and wavelet packet decomposition respectively, and a health index is constructed based on T2 and SPE statistics given by PCA results of the extracted features. The proposed model is validated based on monitoring data of high pressure output pumps in Qingdao LNG terminal. Results show that the calculated health indices are good indicators of the health status of the pumps, and are able to detect potential fault in their early development stages.
Design of two-way self-moving linear ultrasonic motor
Authors: Bai Kai , Li Chaodong , Xi Cong 
Published: March 2020

Abstract
This paper designsa two-way self-moving linear ultrasonic motor. The ultrasonic motor is composed of a diamond-shaped metal elastic body, a piezoelectric ceramic piece and a parallel guide rail. There is a slight gap between the driving foot and the parallel guide rail on both sides of the metal elastic body, and the grounded aluminum tube is sandwiched between the diamond-shaped metal elastic body. By exciting the piezoelectric ceramic sheets on both sides of the elastic body, the first-order bending vibration mode is excited to realize the bidirectional movement of the motor. Based on the analysis of the working principle of the ultrasonic motor, the finite element harmonic response analysis of the ultrasonic motor was carried out. A prototype is made for mechanical properties experiments. Experiments show that under the excitation of 200Vpp, the forward and reverse frequency of the ultrasonic motor is 18.18KHz and 18.07KHz, and the forward and reverse no-load speed is 43.76mm/s and 43.14mm/s. The no-load speed is close to.
Static Frequency Test and Vibration Safety Analysis of Turbine Blades in a Power Plant
Authors: Chai Baotong , Wu Zhengfeng , Zhang DongXing 
Published: March 2020

Abstract
During the overhaul period of steam turbine in some plant, the blades’ vibrational security had been analyzed through the stationary frequency on the spot from the blades by using spectrum analyzer of Nanjing trued software engineering co., Ltd. The results of the test showed the turbine’s blades of next to last stages (stage groups) were safe when they were in operation with the working rotating speed.
Discussion on RB technology and the application in 330MW unit
Authors: Li Yuanyuan , Yan Qing , Han Yingkun , Gao Song , Yu Qingbin , Li Kelei , Liu Enren , Meng Xiangrong 
Published: March 2020

Abstract
The RB function can automatically reduce the unit to a specified value after the main auxiliary equipment of the power plant is tripped to reduce the number of unit outages, which is beneficial to the stability of the power system. Based on the experiments of RB test on different types of power units, this paper makes research of RB technical problem, analyzes the characteristics of RB rapid load reduction and RB plan and test results in detail.
Construction and Empirical Analysis of Intelligent Prediction Model for Electric Grid Project Cost
Authors: An Peng , Liu Jiaguo , Rong Peng , Qi Xiang , Wang Qing , Dai Yong , Yu Baijian , Yuan Fei , Gao Yunxing 
Published: March 2020

Abstract
China’s economic situation has entered a new normal development period, the growth rate of national economic development has fallen, and the state has comprehensively implemented various measures such as price reduction and fee reduction, which makes the operation of electric power enterprises face greater pressure. In this paper, Shandong power transmission and transformation project is taken as the research object, using big data analysis technology and current popular intelligent algorithm to build the intelligent prediction model of power grid project cost, to assist in investment decision-making, reduce the balance rate, strengthen the fine control of investment, improve the precise control level of investment, and enhance the competitiveness of enterprises.
Research on Risk Assessment Technology of Investment Plan Implementation of Electricity Grid Construction Projects Based on Automatically Generated Fixed Asset Investment
Authors: Zhou Ming , Lu Shengwei , Wu Qiang , Jin Sha , Yan Jiong , Sang Zixia , Fang Rengcun 
Published: March 2020

Abstract
In order to achieve accurate verification of the implementation of power grid infrastructure investment plan, support the dynamic monitoring and risk assessment of annual investment plan implementation. Based on the “three rates in one” Investment completion collection value of 110 kV and above grid infrastructure projects, this paper constructs a risk assessment model for the implementation of the investment plan of grid infrastructure projects. Evaluate the rationality of the current reported investment progress, predict the risk of the implementation of the investment plan and quantify the risk amount of the implementation of the plan, timely discover the risk of the implementation of the investment plan, promote the timely resolution of problems, and improve the investment lean management level of power grid enterprises.
An energy storage capacity optimization method based on partition
Authors: Li Yan , Zhu Haifeng , Tian Fangyuan , Deng Kai , Li Wen , Tang Xiaobo 
Published: March 2020

Abstract
With the vision of large-scale deployment of grid-connected distributed energy storage system (ESS) in the distribution network, it is necessary to study the capacity optimization of ESS for striking a balance among investment, renewable energy (RE) consumption, power supply security and price arbitrage. In this paper, an ESS partition model based on the improved flame propagation model is proposed. The results of ESS partition are obtained by constructing indexes such as the flammability of nodes, the wind direction of flame propagation, and the speed of flame propagation. Then, an optimization method for ESS capacity in partition is established, which is to maximize the annual net profit and the integer programming method is used to solve the model. Finally, the effectiveness and feasibility of the method are verified by conducting case studies on the IEEE 33 bus distribution network system. The case study results show that the rational configuration of ESS capacity can improve the economy of planning, and the proposed method can improve the Photovoltaic (PV) local consumption ability and power supply reliability of distribution network.
Typical Cohesion Modes of Foreign Long-Term Power Market with Spot Market and Implications for China
Authors: Yang Su , Chen Kening , Ma Li , Qu Yanyuan , Wu Zechen , Zhang Xiaoxuan 
Published: March 2020

Abstract
Since the 9th document issued by the Government, China’s power market construction process speeds up. Long-term trading and spot trading are both important components of a complete market system. This paper summarizes the cohesion methods and coordinated operation mechanisms of long-term trading and spot trading in typical foreign power markets. This paper also analyzed the advantages, disadvantages and applicability of the cohesion methods of different types of long-term transactions and spot transactions, and propose suggestions for China. It can provide technical support and decision-making reference for relevant government departments to formulate long-term and spot trading rules, and promote the scientific and orderly development of power market.
Design of an online monitoring system forthree-phasebelted HTS cables
Authors: Wei Bengang , Zhou Siyu , Sun Zhonghua , Wang Yifei 
Published: March 2020

Abstract
Three-phase belted High Temperature Superconductor (HTS) cables have compact dimensions and small inter-phase magnetic interference, and have been applied in the Demonstration Project of Domestic km-Level HTS Cable System of State Grid Corporation of China. The three cores of three-phasebelted HTS cablesare bundled together in the same low-temperature bellows, so a single-phase fault may cause the quench of other two phases, and even lead to an overall failure of the three-phase belted cable. Based on the cable body characteristics, cable termination characteristics and cooling system characteristics of the three-phase belted HTS cables, the related online monitoring parameters and monitoring methods are proposed. The design of an online monitoring system for the three-phase belted HTS cables is introduced.
The Impact of Sampling Period Change on Dynamic Phasor Traceability Algorithm Using Least Squares
Authors: Lu Da , Yang Yubo , Zhao Sha 
Published: March 2020

Abstract
In recent years, the electrical signal in Power System becomes more and more complex because of large-scale applications of power electronic equipment. To accurately trace the dynamic phasor, the algorithm based on least squares is used. It is important to develop the dynamic phasor traceability algorithm with high accuracy, good real-time performance and satisfied dynamic property. In this study, the applicability of least squares in dynamic phasor traceability is studied. The relationship between the sampling period and the fundamental period is deduced based on the formula. The accuracy is verified when the sampling period is three quarters of fundamental period. The simulation results show that when the sampling period is three quarters of fundamental period, the frequency response amplitude of this algorithm is flat near the fundamental frequency. Thus, the dynamic phasor can be accurately traced.
Primary frequency modulation characteristics of photovoltaic power station suitable for grid connection certification
Authors: Yao Changqing , Yan Qing , Liu Zhaodong , Zhou Changlai , Li Yuanyuan , Liu Enren , Zhang Chao 
Published: March 2020

Abstract
Photovoltaic power station can participate in the primary frequency modulation of the power system for grid connection certification. The primary frequency modulation capability of photovoltaic power station is analyzed when the light intensity changes. According to theoretical and simulation analysis, by changing the control mode, the photovoltaic power station operated by load reduction can quickly respond to the drop and increase of frequency and reduce the change of frequency after disturbance. Overall results show that the photovoltaic power station with primary frequency control can reduce the frequency of system changes, implement the support for the frequency of the system, and make corresponding adjustment to improve the safety of power grid.
The architecture and key technology of fault inversion systemfor Hybrid UHV AC/DC power system
Authors: Jia Yupei , Wang Bing , Xie Mei , Chang Zhiqin , Jin Yiding 
Published: March 2020

Abstract
The architecture and key technology of fault inversion system for Hybrid UHV AC/DC power system are introduced in this paper. The complete and accurate fault inversion model of power grid is formed by integrating the off-line model of Power System Data Base(PSDB) with the real-time online model of Smart Grid Dispatching and Control System(D5000). This model not only solves the problem that the real-time online model lacks transient parameter, but also overcomes the difficulty that the off-line model cannot reflect the real-time operation condition of the power grid, Therefore, this model meets the requirements of timeliness and accuracy of fault inversion calculation. Based on this model, the simulation calculation and analysis of power grid are carried out, and the changes of electricity volume in the process of power grid fault are simulated accurately. The system has been installed successfully and put into use in the simulation centre of the State Grid. The fault inversion analysis is carried out for State Grid Dispatch Centre and East China power grid. Besides, the scientific validity of the proposed scheme is verified.
Research on On-line Monitoring and Regulation Technology of Pressure of High Voltage Transformer
Authors: Fan Houyang , Zhu Yuancheng , Zheng Wei , Qin Xiaowei , Wu Di , Zhong Dantian 
Published: March 2020

Abstract
In order to analyze the operating status of voltage and current transformers at high voltage levels, the methods of detecting transformer insulation level and infrared temperature are usually used, but such methods usually use manual measurement by portable instruments, and the internal defects of the transformer are difficult to find in time. This article proposes a suitable on-line monitoring method and regulation technology for the insulation oil pressure of high voltage transformers. The defects of the transformer can be judged by the change of the internal oil pressure, which can effectively find faults such as internal short-circuit, degradation, and partial discharge of the transformer. A mechanism is designed to adjust and release the pressure of expanders. The high voltage transformer pressure line monitoring device has developed based on the Internet of Things communication and solar power supply mode, which can monitor the internal operating status of the transformer in real time. When the internal pressure of the transformer suddenly increases, the designed pressure release structure of the expander will automatically rupture, release the internal pressure of the transformer, ensure the safety of the transformer body, and reduce the impact of the accident.
Design of Phase Control System for Parametric Array Loudspeakers Based on FPGA
Authors: Cheng Xiguang , Zhao Hongliang , Zhang Xu 
Published: March 2020

Abstract
In order to achieve accurate control of the audible sound of the acoustic parametric array in the air, fine phase control of the ultrasonic signal as a carrier is required. By establishing the parametric matrix mathematical model and the directivity function formula, the effects of delay accuracy on the ultrasonic carrier and the audible sound deflection angle are simulated and analyzed. The control of 16-channel phase-controlled parametric array excitation signal is realized by using the fast parallel processing speed of FPGA. The signal processing circuit is designed to D/A conversion and amplification of the parametric array excitation signal to drive the piezoelectric transducer array efficiently. The experimental results show that the system can achieve fine control of the parameter array carrier transmission delay. The control accuracy of the parametric array carrier for the 40KHz carrier is 1 ns, and the error delay is less than 1 ns.