{"title":"一种铁路用三相展开固态牵引变压器","authors":"Adnan Khan;Soumya Shubhra Nag;Bhim Singh","doi":"10.1109/TPEL.2025.3529467","DOIUrl":null,"url":null,"abstract":"In this article, a solid-state transformer-based three-phase unfolding powertrain is proposed for railway traction applications. Solid-state transformers are being explored as viable alternatives to line-frequency transformers in railway drivetrains. Conventionally, their back-end employs a low-frequency, two-level pulsewidth modulation (PWM) inverter to drive the motor, which is prone to generating high pulsating torques due to switching frequency constraints. The proposed system, however, eliminates the need for PWM switching in the inverter stage and produces balanced three-phase sinusoidal voltages at the output to drive the motor. This effectively eliminates low-frequency harmonics and reduces torque pulsations. These sinusoidal voltages are achieved by generating pulsating dc voltages at the output of the dc–dc stage, minimizing the need for large dc-link capacitors. The varying voltages are then unfolded by a fundamental frequency switching inverter, which, combined with zero-voltage switching in the dc–dc stage, reduces the switching losses. This article details the operational principle and control strategy of the proposed converter, offering comprehensive insights into its functionality. To validate the effectiveness of the topology, extensive simulations are conducted at a 5-MW power level using MATLAB/Simulink. In addition, the practicality of the proposed topology is demonstrated on a scaled-down experimental prototype with a 5-hp induction motor load.","PeriodicalId":13267,"journal":{"name":"IEEE Transactions on Power Electronics","volume":"40 5","pages":"7439-7452"},"PeriodicalIF":6.6000,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A Three-Phase Unfolding-Based Solid-State Traction Transformer for Railway Application\",\"authors\":\"Adnan Khan;Soumya Shubhra Nag;Bhim Singh\",\"doi\":\"10.1109/TPEL.2025.3529467\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In this article, a solid-state transformer-based three-phase unfolding powertrain is proposed for railway traction applications. Solid-state transformers are being explored as viable alternatives to line-frequency transformers in railway drivetrains. Conventionally, their back-end employs a low-frequency, two-level pulsewidth modulation (PWM) inverter to drive the motor, which is prone to generating high pulsating torques due to switching frequency constraints. The proposed system, however, eliminates the need for PWM switching in the inverter stage and produces balanced three-phase sinusoidal voltages at the output to drive the motor. This effectively eliminates low-frequency harmonics and reduces torque pulsations. These sinusoidal voltages are achieved by generating pulsating dc voltages at the output of the dc–dc stage, minimizing the need for large dc-link capacitors. The varying voltages are then unfolded by a fundamental frequency switching inverter, which, combined with zero-voltage switching in the dc–dc stage, reduces the switching losses. This article details the operational principle and control strategy of the proposed converter, offering comprehensive insights into its functionality. To validate the effectiveness of the topology, extensive simulations are conducted at a 5-MW power level using MATLAB/Simulink. In addition, the practicality of the proposed topology is demonstrated on a scaled-down experimental prototype with a 5-hp induction motor load.\",\"PeriodicalId\":13267,\"journal\":{\"name\":\"IEEE Transactions on Power Electronics\",\"volume\":\"40 5\",\"pages\":\"7439-7452\"},\"PeriodicalIF\":6.6000,\"publicationDate\":\"2025-01-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"IEEE Transactions on Power Electronics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://ieeexplore.ieee.org/document/10839619/\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, ELECTRICAL & ELECTRONIC\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Power Electronics","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/10839619/","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
A Three-Phase Unfolding-Based Solid-State Traction Transformer for Railway Application
In this article, a solid-state transformer-based three-phase unfolding powertrain is proposed for railway traction applications. Solid-state transformers are being explored as viable alternatives to line-frequency transformers in railway drivetrains. Conventionally, their back-end employs a low-frequency, two-level pulsewidth modulation (PWM) inverter to drive the motor, which is prone to generating high pulsating torques due to switching frequency constraints. The proposed system, however, eliminates the need for PWM switching in the inverter stage and produces balanced three-phase sinusoidal voltages at the output to drive the motor. This effectively eliminates low-frequency harmonics and reduces torque pulsations. These sinusoidal voltages are achieved by generating pulsating dc voltages at the output of the dc–dc stage, minimizing the need for large dc-link capacitors. The varying voltages are then unfolded by a fundamental frequency switching inverter, which, combined with zero-voltage switching in the dc–dc stage, reduces the switching losses. This article details the operational principle and control strategy of the proposed converter, offering comprehensive insights into its functionality. To validate the effectiveness of the topology, extensive simulations are conducted at a 5-MW power level using MATLAB/Simulink. In addition, the practicality of the proposed topology is demonstrated on a scaled-down experimental prototype with a 5-hp induction motor load.
期刊介绍:
The IEEE Transactions on Power Electronics journal covers all issues of widespread or generic interest to engineers who work in the field of power electronics. The Journal editors will enforce standards and a review policy equivalent to the IEEE Transactions, and only papers of high technical quality will be accepted. Papers which treat new and novel device, circuit or system issues which are of generic interest to power electronics engineers are published. Papers which are not within the scope of this Journal will be forwarded to the appropriate IEEE Journal or Transactions editors. Examples of papers which would be more appropriately published in other Journals or Transactions include: 1) Papers describing semiconductor or electron device physics. These papers would be more appropriate for the IEEE Transactions on Electron Devices. 2) Papers describing applications in specific areas: e.g., industry, instrumentation, utility power systems, aerospace, industrial electronics, etc. These papers would be more appropriate for the Transactions of the Society which is concerned with these applications. 3) Papers describing magnetic materials and magnetic device physics. These papers would be more appropriate for the IEEE Transactions on Magnetics. 4) Papers on machine theory. These papers would be more appropriate for the IEEE Transactions on Power Systems. While original papers of significant technical content will comprise the major portion of the Journal, tutorial papers and papers of historical value are also reviewed for publication.