Modern power system is undergoing a paradigm shift from the synchronous generators-based system to the power electronics converters-dominated system. With the high penetration of converters, serious stability problems are provoked, especially the wideband oscillations (e.g., sub-synchronous oscillations, harmonic oscillations, etc). Various studies have been conducted in this respect, while most of them separate the ac-side stability with the dc-side stability. However, for the stability analysis of the hybrid AC/DC grid, it is necessary to consider the converter's ac-side and dc-side, simultaneously. In this paper, the stability analysis of voltage source converters (VSCs) considering both ac and dc dynamics is carried out. At first, the threeport AC/DC admittance model of VSCs is established, and the corresponding measurement method from simulations is presented to validate its accuracy. Secondly, based on such three-port model, two stability analysis methods are presented: the one is based on the system open-loop model, where the stability can be judged via the Generalized Nyquist Criterion (GNC); the other one is based on the system closed-loop model, whose stability can be predicted through the pole-zero calculation. At last, a test AC/DC system is built in MATLAB/Simulink, by which the effectiveness of the three-port model-based stability analysis is validated.
{"title":"Three-port impedance model and validation of VSCs for stability analysis","authors":"H. Zong, C. Zhang, X. Cai, M. Molinas","doi":"10.1049/icp.2021.2578","DOIUrl":"https://doi.org/10.1049/icp.2021.2578","url":null,"abstract":"Modern power system is undergoing a paradigm shift from the synchronous generators-based system to the power electronics converters-dominated system. With the high penetration of converters, serious stability problems are provoked, especially the wideband oscillations (e.g., sub-synchronous oscillations, harmonic oscillations, etc). Various studies have been conducted in this respect, while most of them separate the ac-side stability with the dc-side stability. However, for the stability analysis of the hybrid AC/DC grid, it is necessary to consider the converter's ac-side and dc-side, simultaneously. In this paper, the stability analysis of voltage source converters (VSCs) considering both ac and dc dynamics is carried out. At first, the threeport AC/DC admittance model of VSCs is established, and the corresponding measurement method from simulations is presented to validate its accuracy. Secondly, based on such three-port model, two stability analysis methods are presented: the one is based on the system open-loop model, where the stability can be judged via the Generalized Nyquist Criterion (GNC); the other one is based on the system closed-loop model, whose stability can be predicted through the pole-zero calculation. At last, a test AC/DC system is built in MATLAB/Simulink, by which the effectiveness of the three-port model-based stability analysis is validated.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126312605","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}
Yu Zhang, Chen Zhang, Renxin Yang, J. Lyu, Li Liu, X. Cai
The MMC-HVDC connected offshore wind farms (OWFs) could suffer short circuit fault (SCF), whereas their transient stability is not well analysed. In this paper, the mechanism of the loss of synchronization (LOS) of this system is analysed considering the whole system state from the fault-on to the post-fault, and the discussion on fault type and fault clearance is addressed as well. A stability index is proposed to quantify the transient synchronization stability (TSS) of the system, which is capable to not only estimate whether the wind turbine generators (WTGs) be able to get resynchronized with the offshore MMC after the fault is cleared, but also to evaluate the performance of stability improving methods as well. Finally, a scenario of six cases is tested on the PSCAD/EMTDC simulation platform, where the performances of four existing stability improving methods are thoroughly compared via both numerical simulation and the proposed stability index.
{"title":"Transient synchronization stability analysis of wind farms with MMC-HVDC integration under offshore AC grid fault","authors":"Yu Zhang, Chen Zhang, Renxin Yang, J. Lyu, Li Liu, X. Cai","doi":"10.1049/icp.2021.2585","DOIUrl":"https://doi.org/10.1049/icp.2021.2585","url":null,"abstract":"The MMC-HVDC connected offshore wind farms (OWFs) could suffer short circuit fault (SCF), whereas their transient stability is not well analysed. In this paper, the mechanism of the loss of synchronization (LOS) of this system is analysed considering the whole system state from the fault-on to the post-fault, and the discussion on fault type and fault clearance is addressed as well. A stability index is proposed to quantify the transient synchronization stability (TSS) of the system, which is capable to not only estimate whether the wind turbine generators (WTGs) be able to get resynchronized with the offshore MMC after the fault is cleared, but also to evaluate the performance of stability improving methods as well. Finally, a scenario of six cases is tested on the PSCAD/EMTDC simulation platform, where the performances of four existing stability improving methods are thoroughly compared via both numerical simulation and the proposed stability index.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130361048","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}
X. Yan, Z. Yuebin, B. Guobang, C. Wanyu, Y. Liuqing, Y. Wenyong, L. Qiansu, Z. Ronghua, X. Shukai, F. Chuang
Voltage sourced converter (VSC) de-icing device has been gradually applied because of its advantages, such as no requirements on by-pass transformer, no harmonic output on AC side, and small floor area. However, the DC de-icing device will only operate in winter, resulting in low utilization rate. In order to improve the utilization rate of equipment and the power supply reliability of the distribution network, this paper analyzes the current situation of DC de-icing technology and proposes a VSC-HVDC de-icing system composed of two sets of voltage-source DC de-icing devices, which can improve the de-icing efficiency in parallel; Some strategies are proposed, such as AC power balance control of sectionalized busbar under VSC interconnection of de-icing devices as well as emergency power transfer for AC single-end power loss. The paper also builds an EMTDC simulation model of the VSC DC de-icing system and carries out a simulation test, which verifies the functions of the VSC-HVDC de-icing system, such as ice-melting, VAR compensation, AC power balance, and emergency power transfer for AC single-end power loss, etc. The related functions are also verified in the engineering site, which shows that the VSC-HVDC de-icing system proposed in this paper can improve the power supply reliability of distribution substations.
{"title":"Research on MMC de-icing system capable of power grid interconnection","authors":"X. Yan, Z. Yuebin, B. Guobang, C. Wanyu, Y. Liuqing, Y. Wenyong, L. Qiansu, Z. Ronghua, X. Shukai, F. Chuang","doi":"10.1049/icp.2021.2534","DOIUrl":"https://doi.org/10.1049/icp.2021.2534","url":null,"abstract":"Voltage sourced converter (VSC) de-icing device has been gradually applied because of its advantages, such as no requirements on by-pass transformer, no harmonic output on AC side, and small floor area. However, the DC de-icing device will only operate in winter, resulting in low utilization rate. In order to improve the utilization rate of equipment and the power supply reliability of the distribution network, this paper analyzes the current situation of DC de-icing technology and proposes a VSC-HVDC de-icing system composed of two sets of voltage-source DC de-icing devices, which can improve the de-icing efficiency in parallel; Some strategies are proposed, such as AC power balance control of sectionalized busbar under VSC interconnection of de-icing devices as well as emergency power transfer for AC single-end power loss. The paper also builds an EMTDC simulation model of the VSC DC de-icing system and carries out a simulation test, which verifies the functions of the VSC-HVDC de-icing system, such as ice-melting, VAR compensation, AC power balance, and emergency power transfer for AC single-end power loss, etc. The related functions are also verified in the engineering site, which shows that the VSC-HVDC de-icing system proposed in this paper can improve the power supply reliability of distribution substations.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"175 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124294444","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}
In recent years, the research on cascading failures of high proportion new energy power systems has gradually attracted attention. Combine the definition and classification of cascading failures, the characteristics of power system cascading failures after the connection of new energy generation is analyzed. And, from the perspective of the uncertainty analysis after the connection of new energy generation and the cascading trip-off of new energy generators, the status of the research on the mechanism of cascading failures in new energy systems is collected. Wide area control measures at different time scales in systems are integrated. The comprehensive defense method of cascading failures is divided into three parts: component strengthening, operating state optimization and cascading failure blocking control. The key technical issues in the study of cascading failures in new energy grid-connected systems are discussed.
{"title":"Summary of research on cascading failures of high proportion new energy power systems","authors":"A. Wang, W. Zhong, Z. Shen, X. Wang, Y. Yang","doi":"10.1049/icp.2021.2586","DOIUrl":"https://doi.org/10.1049/icp.2021.2586","url":null,"abstract":"In recent years, the research on cascading failures of high proportion new energy power systems has gradually attracted attention. Combine the definition and classification of cascading failures, the characteristics of power system cascading failures after the connection of new energy generation is analyzed. And, from the perspective of the uncertainty analysis after the connection of new energy generation and the cascading trip-off of new energy generators, the status of the research on the mechanism of cascading failures in new energy systems is collected. Wide area control measures at different time scales in systems are integrated. The comprehensive defense method of cascading failures is divided into three parts: component strengthening, operating state optimization and cascading failure blocking control. The key technical issues in the study of cascading failures in new energy grid-connected systems are discussed.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127939319","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}
J. Li, X. Xie, J. Yang, H. Li, Z. Shi, K. Wang, C. Fu, W. Yang
There may be complex interaction between the converter control systems of wind power and MMC-HVDC, which will lead to sub-/super-synchronous oscillation and threaten the safe and stable operation of the system. The relevant events have been reported in Guangdong Nan'ao, Shanghai Nanhui and Zhangbei projects. Rudong offshore wind power project is the first offshore wind power transmission system in China, and it is still under construction. Therefore, it is of great significance to carry out the research on the risk analysis and suppression measures of sub-synchronous oscillation in Rudong wind power MMC-HVDC system. First, the time-domain simulation model of Rudong wind power MMC-HVDC system is built in the PSCAD/EMTDC simulation model. Then, the effects of the number of wind turbine generators, wind power output and the parameters of MMC-HVDC controller on the sub-/super-synchronous oscillation characteristics of the system are further analyzed. Finally, the suppression measures based on supplementary frequency dependent gain control are proposed, the application position of the controller is discussed, and the parameter optimization method of the controller is given. The research content provides a certain guiding significance for the operation and control of Rudong wind power MMC-HVDC.
{"title":"Analysis and suppression of subsynchronous oscillation of Rudong wind power through MMC-HVDC system","authors":"J. Li, X. Xie, J. Yang, H. Li, Z. Shi, K. Wang, C. Fu, W. Yang","doi":"10.1049/icp.2021.2553","DOIUrl":"https://doi.org/10.1049/icp.2021.2553","url":null,"abstract":"There may be complex interaction between the converter control systems of wind power and MMC-HVDC, which will lead to sub-/super-synchronous oscillation and threaten the safe and stable operation of the system. The relevant events have been reported in Guangdong Nan'ao, Shanghai Nanhui and Zhangbei projects. Rudong offshore wind power project is the first offshore wind power transmission system in China, and it is still under construction. Therefore, it is of great significance to carry out the research on the risk analysis and suppression measures of sub-synchronous oscillation in Rudong wind power MMC-HVDC system. First, the time-domain simulation model of Rudong wind power MMC-HVDC system is built in the PSCAD/EMTDC simulation model. Then, the effects of the number of wind turbine generators, wind power output and the parameters of MMC-HVDC controller on the sub-/super-synchronous oscillation characteristics of the system are further analyzed. Finally, the suppression measures based on supplementary frequency dependent gain control are proposed, the application position of the controller is discussed, and the parameter optimization method of the controller is given. The research content provides a certain guiding significance for the operation and control of Rudong wind power MMC-HVDC.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127979238","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}
C. Baiquan, C. Bangfa, W. Pengyang, G. Xuan, L. Qiang
In order to analyze the vibration characteristics of GIS equipment when the contact is poor, we established a threedimensional model of 40.5kV circuit breaker by using the magnetism and solid coupling method. By changing the ratio of the close contact area of moving and stationary contacts to the total area of moving contacts (contact ratio), the situation of poor electrical contact was simulated and analyzed. The simulation results show that, when the contact ratio is constant, the current increases from 1000A to 3000A, and the acceleration of the contact also increases. In the case of the same current, the acceleration value when the contact ratio is 0.3 is greater than the value when the contact ratio is 0.6. When the contact ratio is 0.3 and the current is 3000A, the acceleration amplitude of the component with the frequency of 100Hz is the largest, which is 0.07m/s2. After research and analysis, it is shown that the vibration signal is based on 100Hz as the fundamental frequency. At the same time, multiple frequency components such as 300Hz, 600Hz and some other high-frequency components are generated. Therefore, the contact state can be judged through the measurement and analysis of the vibration signal.
{"title":"Research on electrical contact fault characteristics of GIS circuit breaker based on vibration signal","authors":"C. Baiquan, C. Bangfa, W. Pengyang, G. Xuan, L. Qiang","doi":"10.1049/icp.2021.2546","DOIUrl":"https://doi.org/10.1049/icp.2021.2546","url":null,"abstract":"In order to analyze the vibration characteristics of GIS equipment when the contact is poor, we established a threedimensional model of 40.5kV circuit breaker by using the magnetism and solid coupling method. By changing the ratio of the close contact area of moving and stationary contacts to the total area of moving contacts (contact ratio), the situation of poor electrical contact was simulated and analyzed. The simulation results show that, when the contact ratio is constant, the current increases from 1000A to 3000A, and the acceleration of the contact also increases. In the case of the same current, the acceleration value when the contact ratio is 0.3 is greater than the value when the contact ratio is 0.6. When the contact ratio is 0.3 and the current is 3000A, the acceleration amplitude of the component with the frequency of 100Hz is the largest, which is 0.07m/s2. After research and analysis, it is shown that the vibration signal is based on 100Hz as the fundamental frequency. At the same time, multiple frequency components such as 300Hz, 600Hz and some other high-frequency components are generated. Therefore, the contact state can be judged through the measurement and analysis of the vibration signal.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125074110","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}
With the gradual expansion of the scale of new energy grid connection and the improvement of the level of residential power consumption, the regional grid load has shown an intensive and rapid growth, which results in an increase in the electrical distance of the transmission line. And the line is likely to cause phenomena such as power flow exceeding or under working conditions. Therefore, it is necessary to install power electronic devices to realize functions such as power flow regulation and reactive power compensation, and to improve the transmission efficiency of the grid. This article first introduces the working principle of the UPFC device and then analyses the current common engineering application examples of the UPFC. Finally, a simulation model of the loop network is carried out, and conducts the power flow calculation and short circuit experiment, The results show that the UPFC device has obvious effects on improving the line power flow and suppressing fault of short circuits.
{"title":"Analysis and simulation of UPFC device on power flow optimization and suppression of short-circuit faults of network transmission line","authors":"G. Gao, K. Zhu","doi":"10.1049/icp.2021.2582","DOIUrl":"https://doi.org/10.1049/icp.2021.2582","url":null,"abstract":"With the gradual expansion of the scale of new energy grid connection and the improvement of the level of residential power consumption, the regional grid load has shown an intensive and rapid growth, which results in an increase in the electrical distance of the transmission line. And the line is likely to cause phenomena such as power flow exceeding or under working conditions. Therefore, it is necessary to install power electronic devices to realize functions such as power flow regulation and reactive power compensation, and to improve the transmission efficiency of the grid. This article first introduces the working principle of the UPFC device and then analyses the current common engineering application examples of the UPFC. Finally, a simulation model of the loop network is carried out, and conducts the power flow calculation and short circuit experiment, The results show that the UPFC device has obvious effects on improving the line power flow and suppressing fault of short circuits.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129762796","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}
In order to transport renewable energy cross regions, building a Modular Multilevel Converter-based High Voltage Direct Current (MMCHVDC) system has become one of the important means. It is necessary to build a high precision and fast response fault identification method to ensure the stability of the system. This research proposes a new fault identification technology based on Gated Recurrent Unit (GRU). This method uses single-ended sensors to obtain the current and voltage before and after the fault. Through the trained neural network based on GRU, it can accurately identify the fault type of the MMC-HVDC system. The simulation experiments indicated that the fault diagnosis method of MMC-HVDC system based on GRU can meet the fault identification speed requirement (3 ms), and the accuracy can reach at 98.94%.
{"title":"Fault identification method of MMC-HVDC based on GRU neural network","authors":"D. Zheng, Y. Wang, W. Mo","doi":"10.1049/icp.2021.2580","DOIUrl":"https://doi.org/10.1049/icp.2021.2580","url":null,"abstract":"In order to transport renewable energy cross regions, building a Modular Multilevel Converter-based High Voltage Direct Current (MMCHVDC) system has become one of the important means. It is necessary to build a high precision and fast response fault identification method to ensure the stability of the system. This research proposes a new fault identification technology based on Gated Recurrent Unit (GRU). This method uses single-ended sensors to obtain the current and voltage before and after the fault. Through the trained neural network based on GRU, it can accurately identify the fault type of the MMC-HVDC system. The simulation experiments indicated that the fault diagnosis method of MMC-HVDC system based on GRU can meet the fault identification speed requirement (3 ms), and the accuracy can reach at 98.94%.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128507884","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}
As the basic control unit of thyristor, the reliability of thyristor control unit (TCU) is a fatal device for the reliability of HVDC transmission system. However, the defects of TCU frequently occurred in ±500kV Gui Zhong converter station, such as IP loss, IP oscillation, protective triggering and other abnormal phenomena. Meanwhile, standard of test method and system specially designed for TCU neither existed in Chinese discipline nor in IEC-60700-1. So it is necessary to design special tests on TCU which aim to recover the fault and find out the causes before being put into use. The paper presented the TCU test method, which is used to analyze the fault part of TCU in the converter station. The defeated components are successfully proved to be clipped triode inside the TCU. The test method is necessary supplement for test standard, operation and overhaul of HVDC transmission projects.
{"title":"A fault testing method of hvdc converter valve control unit based on TCU structure","authors":"H. Cong, W. Rongchao, S. Yang","doi":"10.1049/icp.2021.2532","DOIUrl":"https://doi.org/10.1049/icp.2021.2532","url":null,"abstract":"As the basic control unit of thyristor, the reliability of thyristor control unit (TCU) is a fatal device for the reliability of HVDC transmission system. However, the defects of TCU frequently occurred in ±500kV Gui Zhong converter station, such as IP loss, IP oscillation, protective triggering and other abnormal phenomena. Meanwhile, standard of test method and system specially designed for TCU neither existed in Chinese discipline nor in IEC-60700-1. So it is necessary to design special tests on TCU which aim to recover the fault and find out the causes before being put into use. The paper presented the TCU test method, which is used to analyze the fault part of TCU in the converter station. The defeated components are successfully proved to be clipped triode inside the TCU. The test method is necessary supplement for test standard, operation and overhaul of HVDC transmission projects.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132022283","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}
With effective properties, a resistive-type superconducting fault current limit (R-SFCL) has become an effective device to restrain DC-side bipolar short fault currents in multilevel modular converter multiterminal DC systems (MMC-MTDCs). However, due to the resistance-energy accumulation-dependent characteristics of the R-SFCL device, the fault durations and different fault current values will produce various output resistances at each fault stage, and the related coordinated protection and control strategy needs to be adjusted accordingly. Therefore, in the first part of this paper, we analysed the DC side short circuit current mechanism and the fault current restraint characteristics of R-SFCLs. Subsequently, to verify the above analysis, the R-SFCL-based four-terminal MMC-MTDC with DC bipolar short fault modelling and simulation are presented in the next section. Finally, based on the above analysis and research, the advanced DC bipolar fault control and protection strategies of the R-SFCL-based MMC-MTDC system are discussed to promote further study of coordinated and protection control and the application of R-SFCLs in subsequent engineering applications.
{"title":"Fault current suppression for MMC-MTDC with the resistive type superconducting fault current limiter","authors":"G. Liu, Ping Guo, Zheng Yuan, Y. Zhao","doi":"10.1049/icp.2021.2530","DOIUrl":"https://doi.org/10.1049/icp.2021.2530","url":null,"abstract":"With effective properties, a resistive-type superconducting fault current limit (R-SFCL) has become an effective device to restrain DC-side bipolar short fault currents in multilevel modular converter multiterminal DC systems (MMC-MTDCs). However, due to the resistance-energy accumulation-dependent characteristics of the R-SFCL device, the fault durations and different fault current values will produce various output resistances at each fault stage, and the related coordinated protection and control strategy needs to be adjusted accordingly. Therefore, in the first part of this paper, we analysed the DC side short circuit current mechanism and the fault current restraint characteristics of R-SFCLs. Subsequently, to verify the above analysis, the R-SFCL-based four-terminal MMC-MTDC with DC bipolar short fault modelling and simulation are presented in the next section. Finally, based on the above analysis and research, the advanced DC bipolar fault control and protection strategies of the R-SFCL-based MMC-MTDC system are discussed to promote further study of coordinated and protection control and the application of R-SFCLs in subsequent engineering applications.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131739134","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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