The surface charge accumulation on the spacer and the distortion of the surface electric field caused by it are the main reasons for the reduction of flashover voltage of DC GIL (Gas Insulated Transmission Line) spacers. A reasonable spacer structure helps to improve the surface electric field distribution. This paper considers the generation, migration, diffusion and recombination of free ions in GIL gas, and the nonlinear relationship between gas current density and electric field strength. A numerical model for the charge transport and accumulation in DC GIL is established. Based on this model, the surface charge accumulation and electric field distortion characteristics of cone-type spacer with different inclination angles and curvatures of the surface are investigated. The results show that the polarity of the accumulated charge on the two sides of the cone-type spacer is different from that on the inside and outside (concave and convex surface). The negative charge density in the concave surface is 1.6 times that of the positive charge density in the convex. The normal component of the electric field is the main reason for the formation of charge accumulation; The surface charge density of the cone-type spacer increases as its inclination angle increases. and there is a key position for the electric field along the both surfaces. The high-voltage side electric field decreases with the increase of the angle, and the electric field near the ground side increases with the increase of the angle; The smaller the curvature along the spacer, the higher the charge density. The research results can provide reference for structural optimization of cone-type spacer in DC GIL.
{"title":"Surface Charge Accumulation and Electric Field Distribution of Cone-Type Spacer in DC GIL","authors":"J. Zhong, B. Zhang, G. Han, H. Zhang","doi":"10.1049/icp.2021.2581","DOIUrl":"https://doi.org/10.1049/icp.2021.2581","url":null,"abstract":"The surface charge accumulation on the spacer and the distortion of the surface electric field caused by it are the main reasons for the reduction of flashover voltage of DC GIL (Gas Insulated Transmission Line) spacers. A reasonable spacer structure helps to improve the surface electric field distribution. This paper considers the generation, migration, diffusion and recombination of free ions in GIL gas, and the nonlinear relationship between gas current density and electric field strength. A numerical model for the charge transport and accumulation in DC GIL is established. Based on this model, the surface charge accumulation and electric field distortion characteristics of cone-type spacer with different inclination angles and curvatures of the surface are investigated. The results show that the polarity of the accumulated charge on the two sides of the cone-type spacer is different from that on the inside and outside (concave and convex surface). The negative charge density in the concave surface is 1.6 times that of the positive charge density in the convex. The normal component of the electric field is the main reason for the formation of charge accumulation; The surface charge density of the cone-type spacer increases as its inclination angle increases. and there is a key position for the electric field along the both surfaces. The high-voltage side electric field decreases with the increase of the angle, and the electric field near the ground side increases with the increase of the angle; The smaller the curvature along the spacer, the higher the charge density. The research results can provide reference for structural optimization of cone-type spacer in DC GIL.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"7 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":"131343351","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}
L. Wei, W. Han, Z. Jianwen, S. Igarashi, Z. Yu, C. Xu
The power of offshore wind power converters is increasing day by day. With the improvement of power levels, the problem of twisted cables in the tower is becoming more and more serious in low-voltage parallel wind power system. Therefore, this paper proposes a novel wind power converter that can increase the outlet voltage of the generator-converter unit. The newtype converter adopts two-level converter cascade connection on the machine side and three-level converter on the grid side to form a medium and low voltage hybrid wind power converter. The medium and low voltage hybrid topology still use low voltage generators, but the increase in the voltage level of the grid-side converter reduces the number of cables required, effectively solving the problem of twisted cables. For the new type of wind power converter, this paper firstly carries out theoretical modeling, and then proposes the control strategy of the hybrid topology. Finally, the effectiveness of the control strategy is verified on the RTLAB simulation platform, which shows that the new type of converter has good performance in both steady state and transient state.
{"title":"A novel wind power converter for increasing output voltage of generator-converter unit","authors":"L. Wei, W. Han, Z. Jianwen, S. Igarashi, Z. Yu, C. Xu","doi":"10.1049/icp.2021.2572","DOIUrl":"https://doi.org/10.1049/icp.2021.2572","url":null,"abstract":"The power of offshore wind power converters is increasing day by day. With the improvement of power levels, the problem of twisted cables in the tower is becoming more and more serious in low-voltage parallel wind power system. Therefore, this paper proposes a novel wind power converter that can increase the outlet voltage of the generator-converter unit. The newtype converter adopts two-level converter cascade connection on the machine side and three-level converter on the grid side to form a medium and low voltage hybrid wind power converter. The medium and low voltage hybrid topology still use low voltage generators, but the increase in the voltage level of the grid-side converter reduces the number of cables required, effectively solving the problem of twisted cables. For the new type of wind power converter, this paper firstly carries out theoretical modeling, and then proposes the control strategy of the hybrid topology. Finally, the effectiveness of the control strategy is verified on the RTLAB simulation platform, which shows that the new type of converter has good performance in both steady state and transient state.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"13 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":"115004783","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 automatic transfer switch (ATS) can solve problems of voltage drop and instantaneous power interruption, which is one of the most reliable and economical ways to improve the reliability and quality of the power supply. In view of the application requirements of important electricity place, this paper develops a mechanical direct current automatic transfer switch (DCATS) based on the LC resonant commutation, which is characterized by high reliability, fast switching, active and passive combined protection. Firstly, the system scheme and control principle of the mechanical DCATS are introduced. Then, the mechanical DCATS is designed, in which the mechanical switch uses the vacuum switch with the permanent magnet operating mechanism; the LC resonant branch uses the active LC oscillation triggered by the solid-state switch based on thyristor; the switching strategy adopts the series switching mode; and based on the performance of voltage, current and other electrical parameters, the parameter monitoring technology and scheme for monitoring the state of DCATS are proposed. Finally, a test platform is built to verify the feasibility of the technical scheme of the mechanical DCATS. Test results show that the mechanical DCATS can break more than10 kA within 8.3 ms and realize current transfer within 9.1 ms. It provides theoretical and technical basis for the product development and engineering application of the mechanical DCATS.
{"title":"Design, monitoring and test of mechanical direct current automatic transfer switch","authors":"Y. Zhang, D. Lv, H. Wu, S. Li","doi":"10.1049/icp.2021.2570","DOIUrl":"https://doi.org/10.1049/icp.2021.2570","url":null,"abstract":"The automatic transfer switch (ATS) can solve problems of voltage drop and instantaneous power interruption, which is one of the most reliable and economical ways to improve the reliability and quality of the power supply. In view of the application requirements of important electricity place, this paper develops a mechanical direct current automatic transfer switch (DCATS) based on the LC resonant commutation, which is characterized by high reliability, fast switching, active and passive combined protection. Firstly, the system scheme and control principle of the mechanical DCATS are introduced. Then, the mechanical DCATS is designed, in which the mechanical switch uses the vacuum switch with the permanent magnet operating mechanism; the LC resonant branch uses the active LC oscillation triggered by the solid-state switch based on thyristor; the switching strategy adopts the series switching mode; and based on the performance of voltage, current and other electrical parameters, the parameter monitoring technology and scheme for monitoring the state of DCATS are proposed. Finally, a test platform is built to verify the feasibility of the technical scheme of the mechanical DCATS. Test results show that the mechanical DCATS can break more than10 kA within 8.3 ms and realize current transfer within 9.1 ms. It provides theoretical and technical basis for the product development and engineering application of the mechanical DCATS.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"54 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":"133978727","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}
It is of great significance to calculate the time-domain analytical expressions of capacitor voltage, capacitor current and battery current of energy storage MMC in order to analyse the influencing factors of electrical quantity, equipment selection and parameter optimization. Therefore, the energy storage MMC mathematical model needs to be built. This article first introduces the topologies, control principles, and corresponding working states of the energy storage MMC. Then according to different working conditions, using the switching function or averaged value methods to represent each IGBT in the submodule. According to its topological structure, the differential equations are given, and the time domain mathematical expressions of the energy storage MMC electrical quantities are derived. Finally, comparisons between the theoretical calculation and the simulation results obtained from PSCAD/EMTDC have shown that the proposed mathematical model for energy storage MMC have an acceptable calculation accuracy.
{"title":"Mathematical model and steady state characteristic analysis of energy storage MMC","authors":"W. Jin-an, X. Jianzhong","doi":"10.1049/icp.2021.2573","DOIUrl":"https://doi.org/10.1049/icp.2021.2573","url":null,"abstract":"It is of great significance to calculate the time-domain analytical expressions of capacitor voltage, capacitor current and battery current of energy storage MMC in order to analyse the influencing factors of electrical quantity, equipment selection and parameter optimization. Therefore, the energy storage MMC mathematical model needs to be built. This article first introduces the topologies, control principles, and corresponding working states of the energy storage MMC. Then according to different working conditions, using the switching function or averaged value methods to represent each IGBT in the submodule. According to its topological structure, the differential equations are given, and the time domain mathematical expressions of the energy storage MMC electrical quantities are derived. Finally, comparisons between the theoretical calculation and the simulation results obtained from PSCAD/EMTDC have shown that the proposed mathematical model for energy storage MMC have an acceptable calculation accuracy.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"168 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":"116315869","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 proliferation of distributed energy resources, DC microgrid plays an important role in future power grid. This paper proposed a generic fixed-point type method to solve the nonlinear power flow of DC microgrid, which is widely applicable in DC microgrids regardless sizes, topologies and load conditions. The computation steps of the proposed power flow method are given in detail. To improve the versatility of the proposed method, the convergence conditions are presented under masterslave control and droop control modes respectively. Numerical tests verify the consistence of the result obtained by theoretical analysis.
{"title":"A fixed-point type method in power flow studies for DC microgrids","authors":"P. Tian, G. Zhang, C. Huang, C. Wang, N. Xie","doi":"10.1049/icp.2021.2533","DOIUrl":"https://doi.org/10.1049/icp.2021.2533","url":null,"abstract":"With the proliferation of distributed energy resources, DC microgrid plays an important role in future power grid. This paper proposed a generic fixed-point type method to solve the nonlinear power flow of DC microgrid, which is widely applicable in DC microgrids regardless sizes, topologies and load conditions. The computation steps of the proposed power flow method are given in detail. To improve the versatility of the proposed method, the convergence conditions are presented under masterslave control and droop control modes respectively. Numerical tests verify the consistence of the result obtained by theoretical analysis.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"26 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":"116388569","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}
This paper presents design and experiment of a 20kW power conversion module applied in bidirectional DC solid-state transformer (SST). This module consists of a front-end full-bridge circuit with auxiliary soft-switching branch, and a LLC resonant converter serving as an isolated dc transformer. With the discussed modulation scheme, all power devices of the module feature zero-voltage-switching (ZVS) over full load range. Experiments are performed on the built setup, and the results show that for forward or backward power flow, this two stage SST module can achieve 98% efficiency at rated power.
{"title":"Design and experiment of a zero-voltage-switching module for bidirectional DC solid-state transformer","authors":"X. Ren, J. Li, Y. Jiang, H. Weng, D. Xu","doi":"10.1049/icp.2021.2567","DOIUrl":"https://doi.org/10.1049/icp.2021.2567","url":null,"abstract":"This paper presents design and experiment of a 20kW power conversion module applied in bidirectional DC solid-state transformer (SST). This module consists of a front-end full-bridge circuit with auxiliary soft-switching branch, and a LLC resonant converter serving as an isolated dc transformer. With the discussed modulation scheme, all power devices of the module feature zero-voltage-switching (ZVS) over full load range. Experiments are performed on the built setup, and the results show that for forward or backward power flow, this two stage SST module can achieve 98% efficiency at rated power.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"89 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":"129852780","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}
This paper proposes an improved LSSVM power system transient stability evaluation method. According to the Bayesian nonlinear hierarchical framework, the automatic selection of parameters is implemented to improve the sensitivity of LSSVM classifier model to parameter and improve the accuracy of transient stability assessment Firstly, the original feature set related to the system stability is calculated by the wide area measurement information. The feature selection method is used to compute the feature, and the optimal feature set which is strongly related to the stability of the power system is determined. The training set and the test set are divided into Mapped to high-dimensional space, so that the nonlinear and linear classification of the transformation. Then, the optimal parameters of LSSVM are determined by Bayesian nonlinear hierarchical model, and the fast transient stability is determined. Finally, the validity and accuracy of the evaluation model are verified by IEEE-39 node system and actual system.
{"title":"Power system transient stability assessment based on bayesian nonlinear hierarchical framework improved LSSVM","authors":"W. Chang xiang, S. Yin sheng, Z. Li gang","doi":"10.1049/icp.2021.2552","DOIUrl":"https://doi.org/10.1049/icp.2021.2552","url":null,"abstract":"This paper proposes an improved LSSVM power system transient stability evaluation method. According to the Bayesian nonlinear hierarchical framework, the automatic selection of parameters is implemented to improve the sensitivity of LSSVM classifier model to parameter and improve the accuracy of transient stability assessment Firstly, the original feature set related to the system stability is calculated by the wide area measurement information. The feature selection method is used to compute the feature, and the optimal feature set which is strongly related to the stability of the power system is determined. The training set and the test set are divided into Mapped to high-dimensional space, so that the nonlinear and linear classification of the transformation. Then, the optimal parameters of LSSVM are determined by Bayesian nonlinear hierarchical model, and the fast transient stability is determined. Finally, the validity and accuracy of the evaluation model are verified by IEEE-39 node system and actual system.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"2021 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":"129197729","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}
Y. Zhang, X. Zhou, S. Zhu, Q. Huang, Y. Zhu, J. Zhu
In order to solve the problems of power factor decline and power quality degradation caused by a large number of nonlinear loads in microgrids, this paper proposes a master-slave SVG and its control method. The master SVG usually has a large capacity and a low switching frequency. It adopts the indirect current control method to mainly compensate the reactive power of the grid. Due to the characteristics of the SVG converter itself, a certain degree of harmonics will also be generated during operation. This part of the harmonics and the harmonics of the grid itself are compensated by the slave SVG. In the harmonic extraction method, the harmonic extraction method based on instantaneous power theory is adopted. Because the harmonic content in the power grid is small, the capacity of the slave SVG is much smaller than that of the master SVG, so that each part can be fully utilized and has a strong economic efficiency. Finally, the effectiveness of the method proposed in this paper is verified by simulation.
{"title":"Microgrid reactive power compensation and harmonic suppression control method based on master-slave SVG","authors":"Y. Zhang, X. Zhou, S. Zhu, Q. Huang, Y. Zhu, J. Zhu","doi":"10.1049/icp.2021.2550","DOIUrl":"https://doi.org/10.1049/icp.2021.2550","url":null,"abstract":"In order to solve the problems of power factor decline and power quality degradation caused by a large number of nonlinear loads in microgrids, this paper proposes a master-slave SVG and its control method. The master SVG usually has a large capacity and a low switching frequency. It adopts the indirect current control method to mainly compensate the reactive power of the grid. Due to the characteristics of the SVG converter itself, a certain degree of harmonics will also be generated during operation. This part of the harmonics and the harmonics of the grid itself are compensated by the slave SVG. In the harmonic extraction method, the harmonic extraction method based on instantaneous power theory is adopted. Because the harmonic content in the power grid is small, the capacity of the slave SVG is much smaller than that of the master SVG, so that each part can be fully utilized and has a strong economic efficiency. Finally, the effectiveness of the method proposed in this paper is verified by simulation.","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":"124413066","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}
L. Liu, L. Zhao, Jiabao Zhang, D. Xi, J. Zhou, Jiabao Zhang, X. Feng, H. Chen, A. Zhang, Z. Wang, C. Tian
Nowadays, with the vigorous development of smart grids, cascaded H-bridge solid-state transformers (CHB-SST) used in distribution network systems have gradually become an important research hotspot. The multiport CHB-SST serves as the interfacing device to interconnect different grids, which has the functions of bidirectional, power flow control, reactive power compensation, and voltage regulation. However, the power fluctuation of the power cells should be constrained by the large capacitors which in turn worsens the system power density. The second order current in the DC-link side of the CHB-SST will cause the fluctuation of the submodule (SM) capacitor voltage, affecting the capacitance value selection. Therefore, this paper proposes a method to suppress the SM capacitor voltage fluctuation of CHB-SST through fluctuating power control strategy. The control scheme passes the second order current component of the SM capacitor to the low-voltage side of the CHB-SST to reduce the voltage fluctuation of the SM capacitor, such that the capacitance can be optimized. The proposed method is verified via the MATLAB/Simulink model, proving that the fluctuation of the SM capacitor voltage can be effectively suppressed.
{"title":"Control strategy for suppressing submodule capacitor voltage fluctuation in cascaded H-bridge solidstate transformer","authors":"L. Liu, L. Zhao, Jiabao Zhang, D. Xi, J. Zhou, Jiabao Zhang, X. Feng, H. Chen, A. Zhang, Z. Wang, C. Tian","doi":"10.1049/icp.2021.2590","DOIUrl":"https://doi.org/10.1049/icp.2021.2590","url":null,"abstract":"Nowadays, with the vigorous development of smart grids, cascaded H-bridge solid-state transformers (CHB-SST) used in distribution network systems have gradually become an important research hotspot. The multiport CHB-SST serves as the interfacing device to interconnect different grids, which has the functions of bidirectional, power flow control, reactive power compensation, and voltage regulation. However, the power fluctuation of the power cells should be constrained by the large capacitors which in turn worsens the system power density. The second order current in the DC-link side of the CHB-SST will cause the fluctuation of the submodule (SM) capacitor voltage, affecting the capacitance value selection. Therefore, this paper proposes a method to suppress the SM capacitor voltage fluctuation of CHB-SST through fluctuating power control strategy. The control scheme passes the second order current component of the SM capacitor to the low-voltage side of the CHB-SST to reduce the voltage fluctuation of the SM capacitor, such that the capacitance can be optimized. The proposed method is verified via the MATLAB/Simulink model, proving that the fluctuation of the SM capacitor voltage can be effectively suppressed.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"140 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":"122429715","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 OLTC (on-load tap changer) transformer is an effective means to solve the voltage quality problem dynamically. There are many problems for conventional mechanical OLTC transformers, such as small regulating amplitude, low precision, slow speed and circulating current. In this paper, a voltage regulation topology and method based on power electronic transition branch is proposed. By controlling the zero-crossing switch of power electronic switch and the state transformation of the switch, smooth switching of the regulating windings is realized, so as to adjust the equivalent turns on the high voltage side. The simulation analysis and prototype experiment show that the scheme can realize the wide range arcless automatic voltage regulation and has practical application value.
{"title":"Research and implementation of static arcless OLTC transformer","authors":"Q. Song, J. Wang, Z. Han, Y. Wu, L. Li","doi":"10.1049/icp.2021.2592","DOIUrl":"https://doi.org/10.1049/icp.2021.2592","url":null,"abstract":"The OLTC (on-load tap changer) transformer is an effective means to solve the voltage quality problem dynamically. There are many problems for conventional mechanical OLTC transformers, such as small regulating amplitude, low precision, slow speed and circulating current. In this paper, a voltage regulation topology and method based on power electronic transition branch is proposed. By controlling the zero-crossing switch of power electronic switch and the state transformation of the switch, smooth switching of the regulating windings is realized, so as to adjust the equivalent turns on the high voltage side. The simulation analysis and prototype experiment show that the scheme can realize the wide range arcless automatic voltage regulation and has practical application value.","PeriodicalId":242596,"journal":{"name":"2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)","volume":"5 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":"115322517","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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