Pub Date : 2022-12-01DOI: 10.1109/CEECT55960.2022.10030676
Ye Lin, Jing-Liao Sun, Weilun Ni, Jiabin Zhang, Taibin Zhou
The linear programming model based on active power sensitivity ignores the influence of voltage and network loss, the preventive control strategy is difficult to meet the calculation accuracy requirements after AC power flow. An online decision-making method for the overload preventive control of transmission equipment based on the control objects relaxation is proposed. According to the overload safety margin to determine the key equipment which participating in the control and the active power sensitivity under the corresponding expected fault, and convert the allowable current carrying capacity of the line and transformer into the active power limit, establish a linear programming model for online decision-making of overload preventive control. According to the active power precision of preventive control, the active power limit of key equipment is relaxed into multiple gears, different calculation schemes are formed through enumeration-combination, and the online control strategy is determined according to the control cost and checking result of each calculation scheme. Reduce the dimension of the search space of preventive control measures by cluster analysis, and use the parallel computing method to solve the preventive control strategy and static safety checking in two stages, which improves the solution efficiency. The correctness and effectiveness of the proposed method are verified through the analysis of the actual power grid.
{"title":"An Online Decision-Making Method for the Overload Preventive Control of Transmission Equipment Based on the Control Objects Relaxation","authors":"Ye Lin, Jing-Liao Sun, Weilun Ni, Jiabin Zhang, Taibin Zhou","doi":"10.1109/CEECT55960.2022.10030676","DOIUrl":"https://doi.org/10.1109/CEECT55960.2022.10030676","url":null,"abstract":"The linear programming model based on active power sensitivity ignores the influence of voltage and network loss, the preventive control strategy is difficult to meet the calculation accuracy requirements after AC power flow. An online decision-making method for the overload preventive control of transmission equipment based on the control objects relaxation is proposed. According to the overload safety margin to determine the key equipment which participating in the control and the active power sensitivity under the corresponding expected fault, and convert the allowable current carrying capacity of the line and transformer into the active power limit, establish a linear programming model for online decision-making of overload preventive control. According to the active power precision of preventive control, the active power limit of key equipment is relaxed into multiple gears, different calculation schemes are formed through enumeration-combination, and the online control strategy is determined according to the control cost and checking result of each calculation scheme. Reduce the dimension of the search space of preventive control measures by cluster analysis, and use the parallel computing method to solve the preventive control strategy and static safety checking in two stages, which improves the solution efficiency. The correctness and effectiveness of the proposed method are verified through the analysis of the actual power grid.","PeriodicalId":187017,"journal":{"name":"2022 4th International Conference on Electrical Engineering and Control Technologies (CEECT)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115447182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The insulator of the gas insulated switchgear (GIS) is casted with epoxy resin. Under DC voltage, surface area charge accumulation will cause electric field distortion even surface flashover. The effects of different mass fractions of silicon carbide (SiC) on DC conductance and surface charge of epoxy resin were studied. The results show that the conductivity of epoxy resin composites is nonlinear at high field when the content of SIC exceeds 10%. With the increase of SiC content, more shallow traps are introduced, which is conducive to the dissipation of surface charge.
{"title":"Nonlinear Conductivity and Surface Charge Decay Characteristics of SiC/Epoxy Resin Composites","authors":"Hongda Yang, Shiyu Chen, Zhong-Yuan Li, Heqian Liu, Weinan Gao, H. Jia","doi":"10.1109/CEECT55960.2022.10030709","DOIUrl":"https://doi.org/10.1109/CEECT55960.2022.10030709","url":null,"abstract":"The insulator of the gas insulated switchgear (GIS) is casted with epoxy resin. Under DC voltage, surface area charge accumulation will cause electric field distortion even surface flashover. The effects of different mass fractions of silicon carbide (SiC) on DC conductance and surface charge of epoxy resin were studied. The results show that the conductivity of epoxy resin composites is nonlinear at high field when the content of SIC exceeds 10%. With the increase of SiC content, more shallow traps are introduced, which is conducive to the dissipation of surface charge.","PeriodicalId":187017,"journal":{"name":"2022 4th International Conference on Electrical Engineering and Control Technologies (CEECT)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116799449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/CEECT55960.2022.10030721
Yi Wei, Hu Chunchao, Zhang Yanxu, Zhong Zhaobin, Chen Tao, Zhao Yongqiang
The measurement of hidden discharge current of overhead transmission line is one of the important measures to prevent line fault. In view of the characteristics of hidden discharge current of overhead transmission line, such as high bandwidth, wide range and difficult to measure, this article takes advantage of the characteristics of external integration of Rogowski coil suitable for integrating low-frequency signals and self-integration of Rogowski suitable for integrating high-frequency signals. Combining the advantages of both, a composite integral Rogowski coil current sensor is designed. Firstly, the superiority of the composite integral Rogowski coil current sensor is verified by building a simulation model of the Rogowski coil operation. Then, the bandwidth and accuracy of the developed sensor are measured through experiments. The developed sensor can measure the current with a frequency from tens of thousands of hertz to several megahertz, and an effective value from several milliamps to several amperes, it can meet the measurement of hidden discharge current of overhead transmission line.
{"title":"Development of hidden discharge current sensor for overhead transmission line based on composite integral Rogowski coil","authors":"Yi Wei, Hu Chunchao, Zhang Yanxu, Zhong Zhaobin, Chen Tao, Zhao Yongqiang","doi":"10.1109/CEECT55960.2022.10030721","DOIUrl":"https://doi.org/10.1109/CEECT55960.2022.10030721","url":null,"abstract":"The measurement of hidden discharge current of overhead transmission line is one of the important measures to prevent line fault. In view of the characteristics of hidden discharge current of overhead transmission line, such as high bandwidth, wide range and difficult to measure, this article takes advantage of the characteristics of external integration of Rogowski coil suitable for integrating low-frequency signals and self-integration of Rogowski suitable for integrating high-frequency signals. Combining the advantages of both, a composite integral Rogowski coil current sensor is designed. Firstly, the superiority of the composite integral Rogowski coil current sensor is verified by building a simulation model of the Rogowski coil operation. Then, the bandwidth and accuracy of the developed sensor are measured through experiments. The developed sensor can measure the current with a frequency from tens of thousands of hertz to several megahertz, and an effective value from several milliamps to several amperes, it can meet the measurement of hidden discharge current of overhead transmission line.","PeriodicalId":187017,"journal":{"name":"2022 4th International Conference on Electrical Engineering and Control Technologies (CEECT)","volume":"281 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117127688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Large scale new energy sources has high relativity to the distribution network, which will affect grid reactive power operation. Reactive power optimization can effectively improve power quality and system operation's safety, reliability and economy. Firstly, according to the characteristics of the new energy cluster where the isolated grid is connected to the flexible DC grid, a multi-objective imaginary power optimization model is builded that comprehensively includes system power cost and the new energy's reactive power margin cluster. Among them, to maximize the reactive power margin of the new energy cluster can effectively perfect the velocity of network restraint, and realize the pre-regulate of the fixity of transient voltage for the distributed energy cluster. Then, changing multi-objective into a single- objective optimization model by weighting method, and the particle swarm algorithm is used to solve it. Finally, through simulation verification, it is distinct that the proposed imaginary power optimization way can not only effectively reduce the system network loss, but also significantly enhance the imaginary power range of the distributed energy cluster, that can improve the system voltage.
{"title":"Reactive power optimization control strategy for large-scale new energy access grid based on optimized particle swarm algorithm","authors":"Xingning Han, H. Cai, Sixuan Xu, Zhuyi Peng, Feifei Zhao, Wanchun Qi","doi":"10.1109/CEECT55960.2022.10030679","DOIUrl":"https://doi.org/10.1109/CEECT55960.2022.10030679","url":null,"abstract":"Large scale new energy sources has high relativity to the distribution network, which will affect grid reactive power operation. Reactive power optimization can effectively improve power quality and system operation's safety, reliability and economy. Firstly, according to the characteristics of the new energy cluster where the isolated grid is connected to the flexible DC grid, a multi-objective imaginary power optimization model is builded that comprehensively includes system power cost and the new energy's reactive power margin cluster. Among them, to maximize the reactive power margin of the new energy cluster can effectively perfect the velocity of network restraint, and realize the pre-regulate of the fixity of transient voltage for the distributed energy cluster. Then, changing multi-objective into a single- objective optimization model by weighting method, and the particle swarm algorithm is used to solve it. Finally, through simulation verification, it is distinct that the proposed imaginary power optimization way can not only effectively reduce the system network loss, but also significantly enhance the imaginary power range of the distributed energy cluster, that can improve the system voltage.","PeriodicalId":187017,"journal":{"name":"2022 4th International Conference on Electrical Engineering and Control Technologies (CEECT)","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121132223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/CEECT55960.2022.10030582
Daxin Wang, Q. Zhang, Huahu Cui, Honghu Cheng, Xuemeng Zhang, Lei Fan
The measurement of carbon emissions on the customer side is a prerequisite for low-carbon dispatch and carbon trading, and the calculation of carbon emissions per kWh is a necessary condition for building a low-carbon power system. In this paper, we propose a refined measurement model for customer-side carbon emissions based on the carbon emission stream theory. Firstly, the tidal flow distribution in the distribution network is calculated by using the forward-back substitution method with distributed power sources. Secondly, the carbon potential vector, carbon potential factor, and correlation matrix of carbon flow at the distribution network side are calculated. According to the obtained calculation results, a fine-grained carbon emission calculation model for distribution network side including PV and energy storage is proposed to be constructed on the bases of carbon emission flow theory. This model can delineate the correlation between the carbon emissions of the generating units and the carbon flows of each load on the user side. Finally, the IEEE33 node and a 10 kV feeder model of a station area in Anhui Province are chosen as simulation objects. The adaptability and calculation speed of the distribution-side carbon flow calculation model is analyzed. The results show that the calculation model in this paper can solve the distribution-side carbon flow with energy storage and distributed power sources quickly and accurately.
{"title":"A Precise Carbon Emission Model on Electricity Consumption Side with Carbon Emission Flow Theory","authors":"Daxin Wang, Q. Zhang, Huahu Cui, Honghu Cheng, Xuemeng Zhang, Lei Fan","doi":"10.1109/CEECT55960.2022.10030582","DOIUrl":"https://doi.org/10.1109/CEECT55960.2022.10030582","url":null,"abstract":"The measurement of carbon emissions on the customer side is a prerequisite for low-carbon dispatch and carbon trading, and the calculation of carbon emissions per kWh is a necessary condition for building a low-carbon power system. In this paper, we propose a refined measurement model for customer-side carbon emissions based on the carbon emission stream theory. Firstly, the tidal flow distribution in the distribution network is calculated by using the forward-back substitution method with distributed power sources. Secondly, the carbon potential vector, carbon potential factor, and correlation matrix of carbon flow at the distribution network side are calculated. According to the obtained calculation results, a fine-grained carbon emission calculation model for distribution network side including PV and energy storage is proposed to be constructed on the bases of carbon emission flow theory. This model can delineate the correlation between the carbon emissions of the generating units and the carbon flows of each load on the user side. Finally, the IEEE33 node and a 10 kV feeder model of a station area in Anhui Province are chosen as simulation objects. The adaptability and calculation speed of the distribution-side carbon flow calculation model is analyzed. The results show that the calculation model in this paper can solve the distribution-side carbon flow with energy storage and distributed power sources quickly and accurately.","PeriodicalId":187017,"journal":{"name":"2022 4th International Conference on Electrical Engineering and Control Technologies (CEECT)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127298114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/CEECT55960.2022.10030321
Ting Ye, Hang Ji, Xing Lei, Qiang Xu, Shengfu Zhang, Ruitian Fan
In recent years, power cables have been used in large quantities in urban transmission and distribution networks, however, cable accessory faults show an increasing trend year by year. In this paper, based on the study of the principles of air acoustic local discharge and phased array acoustic local discharge, an integrated high voltage cable partial discharge acoustic device based on air acoustic local discharge and phased array acoustic local discharge detection is developed. Through laboratory tests and field together with the application results of grounded transformer cable terminals, it is concluded that for the type of discharge along the surface of the cable terminal, the integrated partial discharge detection of air acoustic local discharge and phased array acoustic local discharge has higher sensitivity than the single phased array acoustic local discharge detection and infrared partial discharge detection. The application effect shows that the sensitivity and efficiency of the detection of partial discharge of cable terminals can be improved based on the integrated air-acoustic local discharge and phased array acoustic partial discharge detection device.
{"title":"Acoustic signal-based cable terminal partial discharge detection and diagnosis","authors":"Ting Ye, Hang Ji, Xing Lei, Qiang Xu, Shengfu Zhang, Ruitian Fan","doi":"10.1109/CEECT55960.2022.10030321","DOIUrl":"https://doi.org/10.1109/CEECT55960.2022.10030321","url":null,"abstract":"In recent years, power cables have been used in large quantities in urban transmission and distribution networks, however, cable accessory faults show an increasing trend year by year. In this paper, based on the study of the principles of air acoustic local discharge and phased array acoustic local discharge, an integrated high voltage cable partial discharge acoustic device based on air acoustic local discharge and phased array acoustic local discharge detection is developed. Through laboratory tests and field together with the application results of grounded transformer cable terminals, it is concluded that for the type of discharge along the surface of the cable terminal, the integrated partial discharge detection of air acoustic local discharge and phased array acoustic local discharge has higher sensitivity than the single phased array acoustic local discharge detection and infrared partial discharge detection. The application effect shows that the sensitivity and efficiency of the detection of partial discharge of cable terminals can be improved based on the integrated air-acoustic local discharge and phased array acoustic partial discharge detection device.","PeriodicalId":187017,"journal":{"name":"2022 4th International Conference on Electrical Engineering and Control Technologies (CEECT)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116445330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/CEECT55960.2022.10030461
Zipeng Wang, Dongliang Zhang, J. Wang, Wenhao You
The pressure regulator pressure control system is one of the main regulation systems in the pressurized water reactor nuclear power plant, which plays an important role in ensuring the normal operation of the nuclear power plant and improving its reliability, which is also of great significance for nuclear safety. In this paper, the Markov/CCMT method is selected to model the failure of the system, obtain the qualitative analysis results of the pressure regulator pressure control system, establish the dynamic reliability model of the system by using the dynamic fault tree method, and analyze the dynamic part of the fault tree by using Markov method. By optimizing the input and processor modules of the system, the effect of the three-take center logic and the addition of hot standby on the reliability of the whole system after adding the standby channel is analyzed around the reliability evaluation. The results of the study show that adding redundancy and standby can effectively improve the reliability of the system.
{"title":"Reliability analysis of pressure control system of nuclear power plant regulator","authors":"Zipeng Wang, Dongliang Zhang, J. Wang, Wenhao You","doi":"10.1109/CEECT55960.2022.10030461","DOIUrl":"https://doi.org/10.1109/CEECT55960.2022.10030461","url":null,"abstract":"The pressure regulator pressure control system is one of the main regulation systems in the pressurized water reactor nuclear power plant, which plays an important role in ensuring the normal operation of the nuclear power plant and improving its reliability, which is also of great significance for nuclear safety. In this paper, the Markov/CCMT method is selected to model the failure of the system, obtain the qualitative analysis results of the pressure regulator pressure control system, establish the dynamic reliability model of the system by using the dynamic fault tree method, and analyze the dynamic part of the fault tree by using Markov method. By optimizing the input and processor modules of the system, the effect of the three-take center logic and the addition of hot standby on the reliability of the whole system after adding the standby channel is analyzed around the reliability evaluation. The results of the study show that adding redundancy and standby can effectively improve the reliability of the system.","PeriodicalId":187017,"journal":{"name":"2022 4th International Conference on Electrical Engineering and Control Technologies (CEECT)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122305961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Current methods for insulator leakage current prediction usually cannot guarantee satisfactory accuracy. To address this issue, a novel prediction method is proposed based on gradient penalized Wasserstein generating adversarial network (WGAN-GP) and an improved support vector regression (SVR) model. The proposed model can: 1) learn the distribution pattern of the real data and generate high-quality training data; 2) optimize parameters of SVR model through the crisscross optimization algorithm (CSO), and 3) improve the prediction accuracy. Owing to the unique gradient penalty, the WGAN-GP network is firstly used to generate high-quality training samples and achieve data augmentation. Then CSO is applied to optimize the model parameters of SVR and thus an improved prediction model is constructed. Finally, the generated data and optimized parameters are applied in the proposed method to predict the insulator leakage current. Experimental results show that the proposed method outperforms the state-of-the-art models in all evaluation indexes and improves the prediction accuracy.
{"title":"Insulator leakage current prediction based on generative adversarial networks and optimized support vector regression with crisscross optimization algorithm","authors":"Huiting Wen, Jianfeng Zhang, Huikang Wen, Jian Wu, Xiaoning Zhao, Weili Lin, Haitao Zhang","doi":"10.1109/CEECT55960.2022.10030195","DOIUrl":"https://doi.org/10.1109/CEECT55960.2022.10030195","url":null,"abstract":"Current methods for insulator leakage current prediction usually cannot guarantee satisfactory accuracy. To address this issue, a novel prediction method is proposed based on gradient penalized Wasserstein generating adversarial network (WGAN-GP) and an improved support vector regression (SVR) model. The proposed model can: 1) learn the distribution pattern of the real data and generate high-quality training data; 2) optimize parameters of SVR model through the crisscross optimization algorithm (CSO), and 3) improve the prediction accuracy. Owing to the unique gradient penalty, the WGAN-GP network is firstly used to generate high-quality training samples and achieve data augmentation. Then CSO is applied to optimize the model parameters of SVR and thus an improved prediction model is constructed. Finally, the generated data and optimized parameters are applied in the proposed method to predict the insulator leakage current. Experimental results show that the proposed method outperforms the state-of-the-art models in all evaluation indexes and improves the prediction accuracy.","PeriodicalId":187017,"journal":{"name":"2022 4th International Conference on Electrical Engineering and Control Technologies (CEECT)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122564604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/CEECT55960.2022.10030639
Tilu Zhang, C. Jiao
With the rapid development of primary and secondary fusion, more and more secondary devices are installed nearby the strong magnetic field sources. In the past, secondary equipment was generally not arranged around the reactor. Nowadays, the high requirement of compact development for space utilization makes it necessary to arrange secondary equipment around the reactor. Since the reactor is a strong magnetic field source in the flexible DC converter station, especially in short circuit, the secondary equipment arranged around it is easy to be disturbed by the strong magnetic field. Thus, the magnetic field distribution of the reactor needs to be studied. The existing studies about the magnetic field distribution are mostly based on highly simplified model. The existing studies about the shielding efficiency of the shielding box are mainly carried out in the high frequency band, and based on simple geometric models. In this paper, Theoretical derivation and simulation calculation of the magnetic field distribution of the unsimplified model are completed. Furthermore, the effects of the orientation of the shielding box with complex structure on the shielding effect are studied. In particular, the frequency of the short circuit current of the reactor measured in the field is analyzed and the self-inductance and mutual inductance parameters are calculated according to the unsimplified reactor structure. The magnetic field distribution around the bipolar reactor is calculated by using Biot Savart's law under the condition of quasi-static state. In addition, the calculation model of the bipolar reactor's magnetic field and the shielding efficiency of the shielding box are established in the electromagnetic field simulation software comsol. The results show that the main frequency range of the short-circuit current is DC- 180kHz, the theoretical calculation of the magnetic field distributionof the reactor is in good agreement with the finite element simulation results, the relative error is within 5%, and the best orientation of the shielded box is that the door is perpendicular to the magnetic field. The research results can provide reference for the layout of secondary equipment and the establishment of immunity standard for protection and control equipment under the condition of short circuit fault in converter station.
{"title":"Analysis of the magnetic field distribution of the reactor and its coupling to the shielding box under short-circuit condition of flexible DC converter station","authors":"Tilu Zhang, C. Jiao","doi":"10.1109/CEECT55960.2022.10030639","DOIUrl":"https://doi.org/10.1109/CEECT55960.2022.10030639","url":null,"abstract":"With the rapid development of primary and secondary fusion, more and more secondary devices are installed nearby the strong magnetic field sources. In the past, secondary equipment was generally not arranged around the reactor. Nowadays, the high requirement of compact development for space utilization makes it necessary to arrange secondary equipment around the reactor. Since the reactor is a strong magnetic field source in the flexible DC converter station, especially in short circuit, the secondary equipment arranged around it is easy to be disturbed by the strong magnetic field. Thus, the magnetic field distribution of the reactor needs to be studied. The existing studies about the magnetic field distribution are mostly based on highly simplified model. The existing studies about the shielding efficiency of the shielding box are mainly carried out in the high frequency band, and based on simple geometric models. In this paper, Theoretical derivation and simulation calculation of the magnetic field distribution of the unsimplified model are completed. Furthermore, the effects of the orientation of the shielding box with complex structure on the shielding effect are studied. In particular, the frequency of the short circuit current of the reactor measured in the field is analyzed and the self-inductance and mutual inductance parameters are calculated according to the unsimplified reactor structure. The magnetic field distribution around the bipolar reactor is calculated by using Biot Savart's law under the condition of quasi-static state. In addition, the calculation model of the bipolar reactor's magnetic field and the shielding efficiency of the shielding box are established in the electromagnetic field simulation software comsol. The results show that the main frequency range of the short-circuit current is DC- 180kHz, the theoretical calculation of the magnetic field distributionof the reactor is in good agreement with the finite element simulation results, the relative error is within 5%, and the best orientation of the shielded box is that the door is perpendicular to the magnetic field. The research results can provide reference for the layout of secondary equipment and the establishment of immunity standard for protection and control equipment under the condition of short circuit fault in converter station.","PeriodicalId":187017,"journal":{"name":"2022 4th International Conference on Electrical Engineering and Control Technologies (CEECT)","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122628747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aiming at the problems of traditional LEC, such as being too subjective, lacking in comprehensive evaluation and universality, this paper proposes an improved LEC method with the introduction of risk control factors, which comprehensively uses the four elements of people, materials, environment and management, fully considers the social and economic factors of the power system. This method can reduce the distortion rate, ensure the objective reliability of the results, and achieve the quantitative evaluation and classification of the hazard sources of power transmission and distribution equipment. Finally, the method is verified based on the previous accident case data of Xinjiang power grid, which provides a new idea for the safety evaluation of power transmission, transformation and distribution equipment.
{"title":"Safety Evaluation of Power Transmission, Transformation and Distribution Equipments by Introducing Risk Control Factors and Specific Environmental Assignments","authors":"Hai Yu, Leiming Yao, Zhimin Qin, Zhenguo Liu, Limin Yang, Sirui Zhu, Wuliang Zhang","doi":"10.1109/CEECT55960.2022.10030612","DOIUrl":"https://doi.org/10.1109/CEECT55960.2022.10030612","url":null,"abstract":"Aiming at the problems of traditional LEC, such as being too subjective, lacking in comprehensive evaluation and universality, this paper proposes an improved LEC method with the introduction of risk control factors, which comprehensively uses the four elements of people, materials, environment and management, fully considers the social and economic factors of the power system. This method can reduce the distortion rate, ensure the objective reliability of the results, and achieve the quantitative evaluation and classification of the hazard sources of power transmission and distribution equipment. Finally, the method is verified based on the previous accident case data of Xinjiang power grid, which provides a new idea for the safety evaluation of power transmission, transformation and distribution equipment.","PeriodicalId":187017,"journal":{"name":"2022 4th International Conference on Electrical Engineering and Control Technologies (CEECT)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114516177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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