2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021)最新文献_第4页

Surface Charge Accumulation and Electric Field Distribution of Cone-Type Spacer in DC GIL 直流电偶极流中锥型间隔器的表面电荷积累与电场分布

2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2581

J. Zhong, B. Zhang, G. Han, H. Zhang

{"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}

引用次数: 0

A novel wind power converter for increasing output voltage of generator-converter unit 一种提高发电-变流器机组输出电压的新型风电变流器

2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2572

L. Wei, W. Han, Z. Jianwen, S. Igarashi, Z. Yu, C. Xu

{"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}

引用次数: 0

Design, monitoring and test of mechanical direct current automatic transfer switch 机械直流自动转换开关的设计、监控和测试

2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2570

Y. Zhang, D. Lv, H. Wu, S. Li

{"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}

引用次数: 0

Mathematical model and steady state characteristic analysis of energy storage MMC 储能MMC的数学模型及稳态特性分析

2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2573

W. Jin-an, X. Jianzhong

引用次数: 1

A fixed-point type method in power flow studies for DC microgrids 直流微电网潮流研究中的定点法

2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2533

P. Tian, G. Zhang, C. Huang, C. Wang, N. Xie

引用次数: 0

Design and experiment of a zero-voltage-switching module for bidirectional DC solid-state transformer 双向直流固态变压器零电压开关模块的设计与实验

2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2567

X. Ren, J. Li, Y. Jiang, H. Weng, D. Xu

引用次数: 0

Power system transient stability assessment based on bayesian nonlinear hierarchical framework improved LSSVM 基于贝叶斯非线性分层框架改进型 LSSVM 的电力系统暂态稳定性评估

2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2552

W. Chang xiang, S. Yin sheng, Z. Li gang

引用次数: 0

Microgrid reactive power compensation and harmonic suppression control method based on master-slave SVG 基于主从SVG的微电网无功补偿及谐波抑制控制方法

2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2550

Y. Zhang, X. Zhou, S. Zhu, Q. Huang, Y. Zhu, J. Zhu

引用次数: 0

Control strategy for suppressing submodule capacitor voltage fluctuation in cascaded H-bridge solidstate transformer 级联h桥固态变压器抑制子模块电容电压波动的控制策略

2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2590

L. Liu, L. Zhao, Jiabao Zhang, D. Xi, J. Zhou, Jiabao Zhang, X. Feng, H. Chen, A. Zhang, Z. Wang, C. Tian

{"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}

引用次数: 0

Research and implementation of static arcless OLTC transformer 静态无弧OLTC变压器的研究与实现

2021 Annual Meeting of CSEE Study Committee of HVDC and Power Electronics (HVDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2592

Q. Song, J. Wang, Z. Han, Y. Wu, L. Li

引用次数: 0