bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on the Differential Protection of the SFC Output Transformer for Pumped Storage Hydro Unit
Authors: Long Feng , Wan Luofei , Pan Shuyan , Liu Xiaobao , Wang Zhonglang , Zhao Ruichen 
Published: August 2021

Abstract
Pumped storage power stations play an great role in promoting new energy consumption, ensuring the safety of power grid, building clean, low-carbon, safe and efficient energy system, and has a broad development prospect. SFC is the most important start-up mode of pumped storage unit, and the output transformer is an important equipment of SFC system, which needs to be equipped with reliable and fast differential protection to ensure its safe and reliable operation. The current frequency varies from 0 to 50Hz during SFC start-up, so the conventional transformer differential protection can not adapt. In this paper, the output transformer differential protection technology is studied according to the electrical characteristics and short circuit fault characteristics of SFC start-up process, the high precision frequency algorithm and the RMS integration algorithm with compensation are proposed to realize the precise measurement of frequency and amplitude, and the ultra-low frequency CT saturation identification technology is proposed to realize the whole process protection of the output transformer from start-up to grid-connection.
Triboelectric nanogenerator with deceleration strip for harvesting vibration energy
Authors: Yang Yanfei , Liu Shiming , Li Yikang , Meng Lixia , Li Xiang 
Published: August 2021

Abstract
To achieve the peaking of carbon emission and carbon neutrality, optimizing the energy structure and accelerating the energy transformation has become an inevitable choice to tackle global climate change and promote sustainable development. The search for sustainable clean energy is urgently needed. In this paper, a triboelectric nanogenerator with deceleration strip (DS-TENG) is proposed to harvest the vibration energy in the environment. The DS-TENG comprises a displacement platform, a base plate, and six springs. The experimental data show that the output performance of DS-TENG: the open-circuit voltage 309 V, short-circuit current 16.6 μA, and transferred charge is 96.6 nC. Meanwhile, the DS-TENG can power the LED board with “20” pattern by harvesting energy from human movement. It can be seen the DS-TENG can harvest energy from low-frequency mechanical energy in the environment. Simultaneously the DS-TENG shows its potential application value in the field of energy collection and expands the application space of TENG in the human living environment.
A Sympathetic Inrush Identification Method Using Substation-Area Currents
Authors: Peng Fang , Zhang Yaotian , Li Chong , Zong Xiju 
Published: August 2021

Abstract
Transformers in power system usually take current differential protection as the main protection, but the protection is easy to be affected by inrush currents and then maloperates. Sympathetic inrush is one kind of inrush currents, which is caused by energization of an adjacent transformer. There were many transformer differential protection maloperation cases caused by sympathetic inrush in the field, while the conventional second harmonic restraint method did not work effectively. In this paper, a method based on substation-area currents and curve fitting is proposed to identify sympathetic inrush. The method is presented using the characteristic that sympathetic inrush and initial inrush alternatively appear in reverse polarities. The characteristic exists continuously during sympathetic inrush. In order to verify effectiveness of the proposed method, PSCAD/EMTDC software is used in this paper to build sympathetic inrush model and obtain simulation data. Simulation results prove that the proposed method can effectively identify sympathetic inrush.
Research on Static Potential Distribution Characteristics of Thyristor Valve of UHV Controllable Arrester
Authors: Chen Zhe , Shen Lin , Fang Chonghao , Wang Zhiyuan , Li Pengfei , Deng Zhanfeng , Guo Xianshan 
Published: August 2021

Abstract
The ultra-high voltage(UHV) AC thyristor valve-type controllable arrester can realize the access and exit of the controllable unit through the action characteristics of the thyristor, dynamically change the volt-ampere characteristics of the arrester connected to the system, to reliably and deeply suppress the operating overvoltage. Under continuous operating voltage, stray capacitance will cause the uneven distribution of axial potential at the high-voltage end of the thyristor valve. In severe cases, the thyristor with higher voltage may be triggered by mistake, which endangers the system security. Due to the more changeable potential distribution of thyristor valve under different ambient temperatures and charge rates, higher requirements are put forward for the design and application of the thyristor valve. Therefore, based on the test data, this paper simulates and analyzes the influence of the voltage and temperature changes of the thyristor and resistor on the potential distribution of the thyristor valve under the continuous operating voltage, analyzes and compares the configuration modes of various voltage equalizng capacitors, and obtains the voltage equalizng measures with better optimization effect, which provides a reference for the voltage equalizng optimization of the thyristor valve.
The Method and Practice of Container Electronic Tag Performance Test
Authors: Xu Shibo , Shi Shuquan , Li Jichun , Zhang Shuhui 
Published: August 2021

Abstract
With the rapid development of container transportation, container transportation has become the main mode of transportation that promotes social development and accelerates the process of globalization. The container RFID electronic tag is expected to improve the transportation efficiency of the container. This article describes the testing methods of container electronic tags. At the same time, through the actual application test of container RFID tags, it summarizes and proposes how to optimize the reading efficiency of container electronic tags, so as to achieve the best performance of container RFID tag system.
Estimating the Energy Consumption and Driving Range of Electric Vehicles with Machine Learning
Authors: Wang Yong , Chenlong Wei , Hongwen He 
Published: August 2021

Abstract
The Data-driven methods have been widely used in the SOC, SOH and energy estimation of electric vehicles, and they are recognized as the most promising approaches. However, the popular machine learning methods used for electric vehicles are often “black boxes” which result in the poor interpretation of the model. In this paper, a highly efficient gradient boosting decision tree (LGBM) is proposed to accurately estimate the driving range of electric vehicle. In this model, the feature importance scores are provided to discover the relationship. In addition, the proposed LGBM-T model is capable of generalizing the abstractions by taking into account the key features of time and temperature. Experimental results illustrate that the proposed LGBM-T algorithm is able to reproduce the driving mileage trajectory, with a low mean absolute error (MAE) bounded by 1.681% on real-world vehicles under complex operating conditions. The availability of this algorithm is further corroborated by comparing to the support vector machines (SVM) based estimator.
Numerical Simulation of Temperature Field and Temperature Control of DC Arc Plasma Torch
Authors: Xu Chengjie , Ye Zhihao , Xiao Han , Li Le , Zhang Jiafan 
Published: August 2021

Abstract
In order to study and analyze the internal heat transfer process of DC arc plasma torch, a two-dimensional axisymmetric model of DC arc plasma torch was established based on magnetohydrodynamics and heat transfer theory. The finite element analysis software COMSOL was used to simulate the temperature field under different conditions. The results show that when the terminal current is constant, the DC plasma arc voltage and the average temperature of the torch outlet increase with the increase of nitrogen standard flow rate, and the maximum temperature in the plasma torch decreases with the increase of nitrogen standard flow rate. When the standard flow rate of nitrogen is constant, the arc voltage decreases with the increase of arc current, and the average temperature of plasma torch exit and the maximum temperature in the torch increase with the increase of arc current. The analysis of simulation data provides theoretical guidance for the temperature control of experimental DC plasma torch.
Multi-Objective Optimization Based Joint Dispatch Model of Wind-Solar-Hydro-Thermal Pumped Storage
Authors: Fugang LI , Shijun CHEN , Weibin HUANG , Guangwen MA 
Published: August 2021

Abstract
In this paper, a joint dispatch model of wind-solar-hydro-thermal pumped storage was proposed, taking into account of the basic requirements of minimum system operation cost, minimum load fluctuation and multiple constraints guarantee. Used NSGA-II multi-objective optimization algorithm to solve the problem, so as to verify the feasibility of the model. The model with good adaptability in multi-objective function can optimize the power of pumped-storage units aiming to improving the peak and valley volatility of the net load with pumped storage, and it can optimize the output of thermal power units with the goal of minimizing system operating costs. The pumped-storage effect can be effectively used to relieve the peak load pressure of thermal power units, which can provide a good reference for comprehensively improving the level of renewable energy utilization and increasing comprehensive benefits.
Research on DPCC Control Strategy of PMSM Based on LESO
Authors: Wu Shaonan , Ping Zengliang , Ma Yuhua 
Published: August 2021

Abstract
In permanent magnet synchronous motor control system, the excellent current control effect is very important to the control performance of the system. In order to eliminate the sampling delay in digital control, the deadbeat predictive current control strategy considering sampling delay is proposed. In order to solve the problem that the predictive current control has low robustness to model parameters, especially motor inductance parameters, combined with ctive disturbance rejection control technology, the linear extended state observer is introduced into deadbeat predictive current control to observe and compensate the internal and external disturbances of the system. The introduction of linear extended state observer improves the robustness of system parameters and the ability of anti load disturbance. The final designed system has the advantages of good speed tracking performance, strong anti-interference ability and greatly improved parameter robustness. Finally, the feasibility and correctness of the proposed control strategy are verified by simulation.
Research on Emergency Power Support Method after Distributed Energy Storage System Blocking UHV DC
Authors: Wang Qiang , Meng Zhen , Zhang Zhi 
Published: August 2021

Abstract
In order to explore the emergency support effect of distributed energy storage on reducing the peak power flow of AC transmission lines and improving the operating power of DC transmission lines after UHV DC locking fault, based on the analysis of UHV DC locking fault, the active power is provided according to the distributed energy storage system. A mathematical model is established to reduce the peak power flow of AC transmission lines by distributed energy storage after DC locking. According to the relationship between power gap and frequency variation, a mathematical model of distributed energy storage to improve UHV DC operating power is established. Based on frequency variation and inertial response time, a mathematical model of dynamic response time of energy storage output on system support effect was established. Taking Henan Power Grid of UHV AC/DC hybrid operation as an example, the simulation analysis of distributed energy storage system response in two ways is carried out, which verifies the effectiveness of distributed energy storage system for emergency power support method after UHV DC locking.
Research on pricing model of uninterrupted maintenance for distribution network project of power grid enterprise
Authors: Chen Tianqiong , Ji Kailin 
Published: August 2021

Abstract
Uninterrupted operation of distribution network engineering is an important means to ensure the safe and reliable operation of power supply equipment and improve the level of power supply reliability and quality service. In recent years, with the vigorous promotion of the power grid company, the uninterrupted operation of distribution network has a more rapid and standardized development. At present, the pricing basis of distribution network engineering has not included the content of uninterrupted power operation, which leads to the problems of unable to find the corresponding quota and unclear charging standard in the actual construction charging process. Therefore, it is urgent to study the pricing method of uninterrupted power operation, guide the uninterrupted power operation, standardize the charging, and promote the healthy development of power construction.
Numerical Simulation of Turbine Expander in Natural Gas Pressure Energy Power Generation System
Authors: Zhixing Zhan , Yanqin Mao , Xiaoyue Wang , Chaojie Li , Liang Cai 
Published: August 2021

Abstract
In this paper, the numerical simulation method is used to study the aerodynamic characteristics of the runoff turbine expander, the key equipment in the natural gas pressure energy recovery power generation system. The geometric structure of the turbine expander under the condition of sub-high pressure natural gas expansion was designed and the flow characteristics of the internal flow field during its operation were obtained by numerical simulation. It is found that the expansion process of fluid in the runoff turbine expander mainly occurs in the guide vane channel and the inlet section of the rotor channel. The turbine expander designed in this paper can well meet the working requirements under design conditions, and the flow in the whole channel is good. When the flow channel in the moving impeller changes from radial to axial, the flow field is complex and there is a poor flow. The research results of this paper provide a reference for the design and optimization of runoff turbine expander in natural gas pressure energy power generation system.
Design and Research of Electric Energy Router Based on Double Sliding Mode Control
Authors: Dong Chong , Zuo Qian , Chen WenGuang , Wei Caiyi 
Published: August 2021

Abstract
With the continuous popularization of the concept of the energy internet, the electric energy router, as a key device in the energy internet, has become a research hotspot. The research has designed an electric energy router with a DC bus structure, which is under the double sliding mode control of outer loop voltage and inner loop current. It is verified by PLECS simulation and comparative analysis of Buck circuit PID control and sliding mode control. Design the overall circuit, verify the feasibility of its structure through simulation, and analyze its working status in grid-connected and island mode. The results show that the power router of this architecture can automatically switch the operation mode, realize the free conversion of "source-network-charge-storage", and solve congestion and faults. Through the comparative analysis of PID and sliding mode control, it can be seen that the dual sliding mode control is more advantageous in terms of dynamic characteristics and response speed. The use of dual sliding mode control is simple to implement, which has better error adjustment characteristics and strong robustness, and the addition of distributed power generation can reduce environmental pollution.
Strategy optimization for virtual power plant complied with power to gas operation model
Authors: Zhang Tao , Ma Junhua , Yan Xing , Huang Wenrui , Wang Lei , Xu Shuangqing , Zhang Xuan 
Published: August 2021

Abstract
Virtual power plant (VPP) is an integrated class of integrated power plant composed of energy management system and small and micro distributed energy resources controlled by it. Its distributed energy sources can be distributed generator sets, distributed energy storage equipment or demand response resources distributed among many demand-side users. Its concept emphasizes more on the function and effect presented to the outside world, updating the operation concept and produce social and economic benefits, in line with the needs and direction of China's power development. Given the uncertainty in renewable energy output and demand response, the VPP market of gas networks, Power to Gas (P2G) equipment, flexible loads and other resources are introduced. Furthermore, VPP's optimal scheduling strategy includes considering power and gas scheduling for both power and gas flows, and studies the optimization model considering the dual energy market to maximize the profits of VPP. Through example studies, the economics and scheduling strategies of the proposed VPP are analyzed. Simulation results show that the VPP proposed in this paper can effectively reduce the proportion of renewable energy emissions reduction by selling power or P2G equipment. Moreover, it is conducive to maintaining the pressure stability and safe operation of the natural gas power grid. VPP can reduce the cost of unbalanced punishment and reduce the impact of uncertainty.
Multi-objective optimization configuration of wind-solar-storage microgrid based on NSGA-III
Authors: Yu Jinghao , Sun Changhai , Kong Ruixi , Zhao Zhe 
Published: August 2021

Abstract
Reasonable allocation of the capacity of micro power supply such as wind turbine, photovoltaic and battery is the premise to ensure the economic, reliable and environmental protection operation of microgrid. Aiming at the capacity allocation problem of grid connected microgrid, this paper establishes a multi-objective optimal allocation mathematical model of grid connected microgrid considering the economy, reliability and environmental protection of microgrid, and uses the genetic algorithm NSGA-III based on the reference point selection mechanism to obtain the multi-objective Pareto solution set of micro source capacity allocation. The simulation results show that NSGA-III can not only optimize the three objective functions better than NSGA-II, but also improve the distribution uniformity of Pareto solution set and the diversity of population. The simulation results show that NSGA-III algorithm is more suitable for multi-objective optimal configuration of microgrid.
Photovoltaic fault diagnosis model based on dynamic switching
Authors: Chen Nanzhou , Hu Shan , Zhu Wenhao , Wang Fei 
Published: August 2021

Abstract
PV module fault diagnosis is mostly based on the prediction of photovoltaic module's power generation in the short term, and the fault of the module can be judged by comparing the difference between the actual power generation and the predicted power generation. However, the photoelectric conversion efficiency of photovoltaic modules varies significantly with seasons and weather, single prediction model is lack of stability, the season in a significant and a change in the weather forecast results will appear large deviation, this will lead to frequent false alarms of fault diagnosis, make power plant maintenance and repair costs unnecessarily. According to the characteristics that the photoelectric conversion efficiency of photovoltaic modules is greatly affected by weather and season, a fault diagnosis method for photovoltaic power generation based on dynamic model switching is proposed. when meet preset conditions, using the different quarters of historical data, combined with recent data to update the model, improved the fitness of model for the current weather and season. Compared with a single fixed model, the results show that the proposed method has better adaptability to different seasons and different weather.
Analysis of the Influence of Nuclear Power Extraction Steam Heating Reformation on Steam Turbine OPC
Authors: Shao Jiaye , Hao Yuhua , Wu Zhigang 
Published: August 2021

Abstract
This article analyzes the influence of the OPC signal transmission, OPC test and OPC action function of the steam turbine before and after the heating renovation of a nuclear power plant, and compares the simulation test of the relevant simulator. The analysis result shows that after the nuclear power plant's heating reformation, the impact on the original steam turbine OPC is not obvious, and it also provides support for the stable operation of the transformed unit, and also provides a reference for subsequent related projects.
Research on Denoising of Transformer Bushing Leads Based on IITD-WTD
Authors: Li Kai , Hao Chenggang , Zhang Jiguo , Sun Woye , Wang Xin 
Published: August 2021

Abstract
When conducting ultrasonic testing of transformer bushing leads, the detection accuracy is susceptible to noise, and it is difficult to accurately determine the state of the leads in the bushing. Aiming at the common noise pollution problem of casing ultrasonic echo signal, we propose an improved inherent time scale decomposition (IITD) and wavelet denoising (WTD) joint denoising algorithm. First, the ultrasonic echo signal is decomposed by improving the time scale; then, the wavelet denoising algorithm is used to remove the noise of each decomposed component; finally, simulation examples and experimental verification show that the signal-to-noise ratio is higher after denoising using the algorithm in the article, the average error is smaller, and the effective vibration information in the ultrasonic echo can be effectively retained. Therefore, the algorithm has certain practical value in engineering applications.
Analysis and Treatment of a Large Abnormal Vibration of 10 Watts in a 1000 MW Generator due to the Deformation of the Rotor End Winding
Authors: Yulei Yang 
Published: August 2021

Abstract
With the widespread application of large-capacity and high-parameter generators in the field of coal-fired power generation, there are more and more cases in which the vibration at both ends of the generator increases abnormally with load changes. This article introduces in detail the analysis and treatment process of the abnormal continuous increase of the 10-watt vibration of a 1000MW turbo-generator after it has been put into operation for two years. After the rotor returned to the factory for disassembly and overhaul, it was finally confirmed that the stacking of the full-size insulating tiles under the guard ring caused partial blockage of the winding deformation of the rotor end and the ventilation holes were the direct causes of abnormal vibration of the generator.
Detection method of inner lead wires of transformer bushing based on parameter estimation of ultrasonic echo model
Authors: Hao Chenggang , Li Kai , Zhang Jiguo , Sun Woye , Wang Xin 
Published: August 2021

Abstract
In order to solve the problem of low accuracy of the ultrasonic detecting method for the lead wires of the transformer bushing, this paper used the method of parameter estimation of the ultrasonic echo model to improve the accuracy of the ultrasonic flight time. First, this paper proposed an ultrasonic Gaussian model that suitable for detecting inner lead wires of transformer bushings, constructs a least-squares objective function, and then uses a particle swarm optimization algorithm to search for the optimal solution of the objective function globally, and proposes an algorithm for parameter estimation of the echo model. Finally, it is proved that the detection method proposed in this paper has the advantage of anti-noise interference through experiment, and the detection accuracy is improved. So, this method can detect the state of the lead wires in the transformer bushing.