Pub Date : 2021-05-28DOI: 10.1109/CIEEC50170.2021.9510803
Shilou Huang, T. Ji, Tong Wang
This paper proposes transfer function sensitivity based index for doubly fed induction generator (DFIG) shedding scheme to mitigate subsynchronous oscillation. Firstly, the Phillips-Heffron model of the power system integrated with DFIG is built, and the transfer functions of DFIGs and other left part of the power system are derived. Then, the transfer function sensitivity of DFIG, which considers each DFIG as a whole part presented by a feedback transfer function, is obtained through calculating the logarithmic partial derivative of DFIG to the whole power system. Finally, the improved four-machine two-zone system with 4 DFIGs is used as the test system to verify the validity of transfer function sensitivity, the results of simulation prove that the transfer function sensitivity could quantize the influence of DFIG on subsynchronous oscillation and shedding DFIG with positive sensitivity could mitigate subsynchronous oscillation.
{"title":"Transfer Function Sensitivity Based DFIG Shedding Scheme to Mitigate Subsynchronous Oscillation","authors":"Shilou Huang, T. Ji, Tong Wang","doi":"10.1109/CIEEC50170.2021.9510803","DOIUrl":"https://doi.org/10.1109/CIEEC50170.2021.9510803","url":null,"abstract":"This paper proposes transfer function sensitivity based index for doubly fed induction generator (DFIG) shedding scheme to mitigate subsynchronous oscillation. Firstly, the Phillips-Heffron model of the power system integrated with DFIG is built, and the transfer functions of DFIGs and other left part of the power system are derived. Then, the transfer function sensitivity of DFIG, which considers each DFIG as a whole part presented by a feedback transfer function, is obtained through calculating the logarithmic partial derivative of DFIG to the whole power system. Finally, the improved four-machine two-zone system with 4 DFIGs is used as the test system to verify the validity of transfer function sensitivity, the results of simulation prove that the transfer function sensitivity could quantize the influence of DFIG on subsynchronous oscillation and shedding DFIG with positive sensitivity could mitigate subsynchronous oscillation.","PeriodicalId":110429,"journal":{"name":"2021 IEEE 4th International Electrical and Energy Conference (CIEEC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128493274","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 : 2021-05-28DOI: 10.1109/CIEEC50170.2021.9510924
Ganghua Qin, Tie Jiang, Guangyu Zhu, Xiangrong Chen
The widely used epoxy resin for high temperature superconducting (HTS) HVDC transmission system suffers the issue of electrical tree aging under high electrical field. Improving the DC electrical performance of epoxy resin at cryogenic temperature is the key to the safe and stable operation of HTS transmission. In this paper, electrical tree initiation characteristics at room and cryogenic temperature are tested. Moreover, thermogravimetric analysis (TGA) characterization of nanoparticles is carried out. The results show that the thermogravimetric process of nanoparticles modified with KH560 can be divided into physical and chemical thermogravimetric process, which indicates KH560 can effectively modify the surface of nano-alumina. With the increase of applied voltage cycles, the probability of tree initiation increases until all samples are triggered. At room temperature, it is found that the higher content of nano-alumina has the lower the tree initiation probability. In addition, the probability of DC tree initiation at cryogenic temperature is lower than that at room temperature. Furthermore, the tree initiation probability at 1 kV/s is much higher than that at 0.1 kV/s at both room and cryogenic temperatures.
{"title":"Effect of Cryogenic Temperature on DC Electrical Tree Initiation Characteristics of Epoxy Nanocomposites","authors":"Ganghua Qin, Tie Jiang, Guangyu Zhu, Xiangrong Chen","doi":"10.1109/CIEEC50170.2021.9510924","DOIUrl":"https://doi.org/10.1109/CIEEC50170.2021.9510924","url":null,"abstract":"The widely used epoxy resin for high temperature superconducting (HTS) HVDC transmission system suffers the issue of electrical tree aging under high electrical field. Improving the DC electrical performance of epoxy resin at cryogenic temperature is the key to the safe and stable operation of HTS transmission. In this paper, electrical tree initiation characteristics at room and cryogenic temperature are tested. Moreover, thermogravimetric analysis (TGA) characterization of nanoparticles is carried out. The results show that the thermogravimetric process of nanoparticles modified with KH560 can be divided into physical and chemical thermogravimetric process, which indicates KH560 can effectively modify the surface of nano-alumina. With the increase of applied voltage cycles, the probability of tree initiation increases until all samples are triggered. At room temperature, it is found that the higher content of nano-alumina has the lower the tree initiation probability. In addition, the probability of DC tree initiation at cryogenic temperature is lower than that at room temperature. Furthermore, the tree initiation probability at 1 kV/s is much higher than that at 0.1 kV/s at both room and cryogenic temperatures.","PeriodicalId":110429,"journal":{"name":"2021 IEEE 4th International Electrical and Energy Conference (CIEEC)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128638942","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 : 2021-05-28DOI: 10.1109/CIEEC50170.2021.9510658
Yu Jiang, Xiangrong Liu, Xuexia Zhang
Proton exchange membrane fuel cell (PEMFC) is a competitive energy conversion device with the zero emission of greenhouse gas and high efficiency. However, cell inconsistency in stack and non-uniformity in single cell affect the performance and accelerate localized degradation. A 7-channel serpentine flow field PEMFC is modeled based on the practical one. In this paper, numerical simulation method based on computational fluid dynamics is applied to investigate the distribution of physical field in membrane. The accuracy of simulation results is verified by experimental polarization curve. The current density, temperature and water content distribution under two working states (0.7665 V and 0.5311 V) are selected for analysis, and the distribution non-uniformity is quantitatively described and compared. The results demonstrate that numerical simulation is a convenient and inexpensive method assisting to PEMFC analysis in engineering application.
{"title":"Non-uniformity Analysis of Parameter Distribution in a 7-channel Serpentine Flow Field Proton Exchange Membrane Fuel Cell","authors":"Yu Jiang, Xiangrong Liu, Xuexia Zhang","doi":"10.1109/CIEEC50170.2021.9510658","DOIUrl":"https://doi.org/10.1109/CIEEC50170.2021.9510658","url":null,"abstract":"Proton exchange membrane fuel cell (PEMFC) is a competitive energy conversion device with the zero emission of greenhouse gas and high efficiency. However, cell inconsistency in stack and non-uniformity in single cell affect the performance and accelerate localized degradation. A 7-channel serpentine flow field PEMFC is modeled based on the practical one. In this paper, numerical simulation method based on computational fluid dynamics is applied to investigate the distribution of physical field in membrane. The accuracy of simulation results is verified by experimental polarization curve. The current density, temperature and water content distribution under two working states (0.7665 V and 0.5311 V) are selected for analysis, and the distribution non-uniformity is quantitatively described and compared. The results demonstrate that numerical simulation is a convenient and inexpensive method assisting to PEMFC analysis in engineering application.","PeriodicalId":110429,"journal":{"name":"2021 IEEE 4th International Electrical and Energy Conference (CIEEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129324081","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 : 2021-05-28DOI: 10.1109/CIEEC50170.2021.9510481
Yudi Qin, Xuebing Han, Yifan Wei, Languang Lu, Jianqiu Li, Jiuyu Du, M. Ouyang, Yujie Sheng
As the rapid development of renewable energy and electrification of transport, the stability and efficiency of power system will encounter inevitable challenges. A decentralized Vehicle-to-Grid (V2G) framework for fast charging infrastructures joining in the primacy frequency regulation is proposed in this paper to cope the fluctuation of renewable energies. Two interaction modes are transferred according to the state of charge (SOC) of PEVs (Plug-in electric vehicles) in order to meet the fast-charging demand of drivers primarily. Based on the engineering system of vehicle battery pack, we fabricate detailed interaction logics among fast charger, V2G controller, battery pack and battery management system (BMS). The effective V2G control strategies need to consider the power limitations and charging effects. As a consequence, an equivalent circuit battery model (ECM) with high accuracy for dynamic and fluctuation working conditions is employed to obtain power limitations of lithium-ion batteries (LIBs). Furthermore, fast-charging-oriented droop control strategies are designed to participate regulation of power grid with negligible impact on fast charging. An alternative current (AC) power system with high penetration of renewable resources is constructed to verify the effects. The results of case study reveal that the proposed method with bidirectional chargers can reduce the fluctuation from renewables, loads and PEVs by 21.22%, accompanied by PEVs’ SOC changes lower than 0.5%. Interestingly, a high renewable penetration system can eliminate frequency derivation by adding PEVs with proposed regulation.
{"title":"A Vehicle-to-Grid Frequency Regulation Framework for Fast Charging Infrastructures Considering Power Performances of Lithium-ion Batteries and Chargers","authors":"Yudi Qin, Xuebing Han, Yifan Wei, Languang Lu, Jianqiu Li, Jiuyu Du, M. Ouyang, Yujie Sheng","doi":"10.1109/CIEEC50170.2021.9510481","DOIUrl":"https://doi.org/10.1109/CIEEC50170.2021.9510481","url":null,"abstract":"As the rapid development of renewable energy and electrification of transport, the stability and efficiency of power system will encounter inevitable challenges. A decentralized Vehicle-to-Grid (V2G) framework for fast charging infrastructures joining in the primacy frequency regulation is proposed in this paper to cope the fluctuation of renewable energies. Two interaction modes are transferred according to the state of charge (SOC) of PEVs (Plug-in electric vehicles) in order to meet the fast-charging demand of drivers primarily. Based on the engineering system of vehicle battery pack, we fabricate detailed interaction logics among fast charger, V2G controller, battery pack and battery management system (BMS). The effective V2G control strategies need to consider the power limitations and charging effects. As a consequence, an equivalent circuit battery model (ECM) with high accuracy for dynamic and fluctuation working conditions is employed to obtain power limitations of lithium-ion batteries (LIBs). Furthermore, fast-charging-oriented droop control strategies are designed to participate regulation of power grid with negligible impact on fast charging. An alternative current (AC) power system with high penetration of renewable resources is constructed to verify the effects. The results of case study reveal that the proposed method with bidirectional chargers can reduce the fluctuation from renewables, loads and PEVs by 21.22%, accompanied by PEVs’ SOC changes lower than 0.5%. Interestingly, a high renewable penetration system can eliminate frequency derivation by adding PEVs with proposed regulation.","PeriodicalId":110429,"journal":{"name":"2021 IEEE 4th International Electrical and Energy Conference (CIEEC)","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129342097","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 : 2021-05-28DOI: 10.1109/cieec50170.2021.9510255
Hao Zhang, Zhijun Wang, Yongqi Yao, Yapei Liu, Yingqian Du, Miaoxin Li
In order to solve the problem of low calculation efficiency of the dynamic electric field of the arc extinguishing chamber, based on the commercial fluid simulation software, a joint simulation technology of air flow field and dynamic electric field is developed in this paper. The grid independence was verified by establishing a test model, and the results were compared with the classical electrostatic field calculation results. The results show that the joint simulation method of airflow field and dynamic electric field developed in this paper can accurately calculate the dynamic electric field of the arc extinguisher, greatly improve the calculation efficiency of the dynamic electric field, and establish a foundation and accumulate experience for the simulation and analysis of the electrical breakdown of the arc extinguisher after arc.
{"title":"Co-simulation study on airflow field and dynamic electric field of high voltage SF6 circuit breaker","authors":"Hao Zhang, Zhijun Wang, Yongqi Yao, Yapei Liu, Yingqian Du, Miaoxin Li","doi":"10.1109/cieec50170.2021.9510255","DOIUrl":"https://doi.org/10.1109/cieec50170.2021.9510255","url":null,"abstract":"In order to solve the problem of low calculation efficiency of the dynamic electric field of the arc extinguishing chamber, based on the commercial fluid simulation software, a joint simulation technology of air flow field and dynamic electric field is developed in this paper. The grid independence was verified by establishing a test model, and the results were compared with the classical electrostatic field calculation results. The results show that the joint simulation method of airflow field and dynamic electric field developed in this paper can accurately calculate the dynamic electric field of the arc extinguisher, greatly improve the calculation efficiency of the dynamic electric field, and establish a foundation and accumulate experience for the simulation and analysis of the electrical breakdown of the arc extinguisher after arc.","PeriodicalId":110429,"journal":{"name":"2021 IEEE 4th International Electrical and Energy Conference (CIEEC)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124610279","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 : 2021-05-28DOI: 10.1109/cieec50170.2021.9510928
B. Wan, Min Dai, Lei Wang, Jianben Liu, Yanze Zhang, J. Si, Zeyu He, Xiaoyue Chen
In the research of Very Fast Transient Overvoltage(VFTO), the accuracy of arc model of disconnector largely influences the VFTO calculation results. How to accurately simulate the striking and extinguishing process of the arc during the action of the disconnector is the key issue of studying arc model. In this paper, the ATP-EMTP electromagnetic transient program was used to simulate the arc damping by series connection of constant resistance and time-varying inductance, and the built-in MODELS module was used for programming to simulate the restriking process of the arc. The model was applied to a 1000kV GIS test circuit. The voltage and current waveforms were analyzed under the opening and closing operations of the model, and the results were compared with the single breakdown arc model. At the same time, combined with the restriking arc model, the influence of opening speed of disconnector on VFTO was analyzed. The present study suggests that the restriking arc model can better reflect the VFTO characteristics during the breakdown process of disconnector. When the opening speed is less than 0.7m/s, the maximum VFTO of the test circuit increases with the increase of opening speed. When the VFTO amplitude reaches the maximum, it will decrease with the further increase of opening speed.
{"title":"Considering Restriking Arc Model 1000kV GIS Very Fast Transient Overvoltage Characteristics and the Influence of Disconnector Speed","authors":"B. Wan, Min Dai, Lei Wang, Jianben Liu, Yanze Zhang, J. Si, Zeyu He, Xiaoyue Chen","doi":"10.1109/cieec50170.2021.9510928","DOIUrl":"https://doi.org/10.1109/cieec50170.2021.9510928","url":null,"abstract":"In the research of Very Fast Transient Overvoltage(VFTO), the accuracy of arc model of disconnector largely influences the VFTO calculation results. How to accurately simulate the striking and extinguishing process of the arc during the action of the disconnector is the key issue of studying arc model. In this paper, the ATP-EMTP electromagnetic transient program was used to simulate the arc damping by series connection of constant resistance and time-varying inductance, and the built-in MODELS module was used for programming to simulate the restriking process of the arc. The model was applied to a 1000kV GIS test circuit. The voltage and current waveforms were analyzed under the opening and closing operations of the model, and the results were compared with the single breakdown arc model. At the same time, combined with the restriking arc model, the influence of opening speed of disconnector on VFTO was analyzed. The present study suggests that the restriking arc model can better reflect the VFTO characteristics during the breakdown process of disconnector. When the opening speed is less than 0.7m/s, the maximum VFTO of the test circuit increases with the increase of opening speed. When the VFTO amplitude reaches the maximum, it will decrease with the further increase of opening speed.","PeriodicalId":110429,"journal":{"name":"2021 IEEE 4th International Electrical and Energy Conference (CIEEC)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124779205","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}
Power cables in the urban power supply system are laid in cable trenches or directly buried underground, and the insulation is susceptible to corrosion and penetration, causing local insulation aging or abrasion. Early detection of soft faults helps prevent power system faults from occurring. This paper proposes a method that can detect cable multi-point soft faults and distinguish fault types based on Frequency Domain Reflectometry (FDR). Firstly, we establish a numerical calculation model of distributed parameters to analyze the impedance spectroscopy characteristics of different types of defects and the positioning methods and errors. Next, a simulation study was carried out for different characteristics of aging and damage, which means different types of soft faults were successfully distinguished. Then, based on the results of the simulation, experiments are carried out to verify the effectiveness of the positioning algorithm and the feasibility of distinguishing defect types. Simulation and experiment show that the positioning error is within 0.5% and 1% simultaneously. Compared with traditional location methods, the defect location method proposed in this paper can determine the type and severity of the defect while locating multiple defects. The experimental results show that the defect identification method proposed in this paper has great potential for field application.
{"title":"A Novel Method for Identifying Cable Defect and Improving Location Accuracy Based on Frequency Domain Reflectometry","authors":"Haotian Zhang, H. Mu, X. Zou, Daning Zhang, Guanjun Zhang, Cheng Xie","doi":"10.1109/CIEEC50170.2021.9510503","DOIUrl":"https://doi.org/10.1109/CIEEC50170.2021.9510503","url":null,"abstract":"Power cables in the urban power supply system are laid in cable trenches or directly buried underground, and the insulation is susceptible to corrosion and penetration, causing local insulation aging or abrasion. Early detection of soft faults helps prevent power system faults from occurring. This paper proposes a method that can detect cable multi-point soft faults and distinguish fault types based on Frequency Domain Reflectometry (FDR). Firstly, we establish a numerical calculation model of distributed parameters to analyze the impedance spectroscopy characteristics of different types of defects and the positioning methods and errors. Next, a simulation study was carried out for different characteristics of aging and damage, which means different types of soft faults were successfully distinguished. Then, based on the results of the simulation, experiments are carried out to verify the effectiveness of the positioning algorithm and the feasibility of distinguishing defect types. Simulation and experiment show that the positioning error is within 0.5% and 1% simultaneously. Compared with traditional location methods, the defect location method proposed in this paper can determine the type and severity of the defect while locating multiple defects. The experimental results show that the defect identification method proposed in this paper has great potential for field application.","PeriodicalId":110429,"journal":{"name":"2021 IEEE 4th International Electrical and Energy Conference (CIEEC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125110620","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 quench detection and fault protection of high- temperature superconducting (HTS) cables are the core and foundation of ensuring the safe operation of HTS cables. Because the great difference between the structure and fault mechanism of HTS cable and traditional cable, the protection configuration and implementation principle have not yet formed a unified understanding. Based on the analysis of the fault types of HTS cable and the mechanism of quench fault, this paper proposes a comprehensive configuration scheme combining short-circuit protection and quench protection according to the performance characteristics and influence consequences. In view of the special and complex protection functions such as sequential action protection and inverse time overheating protection, the specific principle and implementation method are given.
{"title":"Research on configuration scheme and principle of HTS cable protection","authors":"Xiaofeng He, Renli Cheng, Weizhe Ma, Anlong Zhang, Zeqi Chen, Reheman Yushan, Zhe Zhang, Zhenzhe Zhang, X.G. Yin","doi":"10.1109/CIEEC50170.2021.9511075","DOIUrl":"https://doi.org/10.1109/CIEEC50170.2021.9511075","url":null,"abstract":"The quench detection and fault protection of high- temperature superconducting (HTS) cables are the core and foundation of ensuring the safe operation of HTS cables. Because the great difference between the structure and fault mechanism of HTS cable and traditional cable, the protection configuration and implementation principle have not yet formed a unified understanding. Based on the analysis of the fault types of HTS cable and the mechanism of quench fault, this paper proposes a comprehensive configuration scheme combining short-circuit protection and quench protection according to the performance characteristics and influence consequences. In view of the special and complex protection functions such as sequential action protection and inverse time overheating protection, the specific principle and implementation method are given.","PeriodicalId":110429,"journal":{"name":"2021 IEEE 4th International Electrical and Energy Conference (CIEEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129913787","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 : 2021-05-28DOI: 10.1109/cieec50170.2021.9510663
Cai Xu, Jingyuan Liu, Chunhui Liu, Yunpeng Bai
High voltage DC electronic current transformer is the key equipment in HVDC system, and its transient step response is one of the most important indicators for the control and protection, which is significant to power quality and power supply reliability of the power network. This paper introduces the structure of DC electronic current transformer and the corresponding transient step response character and related influence factors. A closed-loop test method on transient step response for DC electronic current transformer is proposed. Polynomial fitting is used to calculate the delay time of the step response, the rise time error of the field testing results and other key indicators. The validity of the test method is proved at a HVDC converter station testing system.
{"title":"Analysis and Test Method on Transient Step Response Character of High Voltage DC Electronic Current Transformer","authors":"Cai Xu, Jingyuan Liu, Chunhui Liu, Yunpeng Bai","doi":"10.1109/cieec50170.2021.9510663","DOIUrl":"https://doi.org/10.1109/cieec50170.2021.9510663","url":null,"abstract":"High voltage DC electronic current transformer is the key equipment in HVDC system, and its transient step response is one of the most important indicators for the control and protection, which is significant to power quality and power supply reliability of the power network. This paper introduces the structure of DC electronic current transformer and the corresponding transient step response character and related influence factors. A closed-loop test method on transient step response for DC electronic current transformer is proposed. Polynomial fitting is used to calculate the delay time of the step response, the rise time error of the field testing results and other key indicators. The validity of the test method is proved at a HVDC converter station testing system.","PeriodicalId":110429,"journal":{"name":"2021 IEEE 4th International Electrical and Energy Conference (CIEEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130487659","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 Flywheel energy storage system (FESS) is becoming more and more attractive due to its broad application prospects. The practical application of FESS faces the problem of rotor heating caused by high frequency harmonics of PWM inverter, especially in medium and high speed systems, which seriously restricts the performance of the system. In this paper, a suppression method of high frequency ripple based on capacitor isolated ripple compensation inverter is proposed. The operating principle of the circuit is analyzed and the control method based on this circuit is designed. Finally, simulations are built to demonstrate the validity of the analysis.
{"title":"A Ripple Suppression Method Applied to Flywheel Energy Storage System","authors":"Zhiqiang Liu, Congzhe Gao, Guanda Lu, Xinjian Jiang, Jingliang Lv","doi":"10.1109/CIEEC50170.2021.9510786","DOIUrl":"https://doi.org/10.1109/CIEEC50170.2021.9510786","url":null,"abstract":"The Flywheel energy storage system (FESS) is becoming more and more attractive due to its broad application prospects. The practical application of FESS faces the problem of rotor heating caused by high frequency harmonics of PWM inverter, especially in medium and high speed systems, which seriously restricts the performance of the system. In this paper, a suppression method of high frequency ripple based on capacitor isolated ripple compensation inverter is proposed. The operating principle of the circuit is analyzed and the control method based on this circuit is designed. Finally, simulations are built to demonstrate the validity of the analysis.","PeriodicalId":110429,"journal":{"name":"2021 IEEE 4th International Electrical and Energy Conference (CIEEC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127044007","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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