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基于模块化多电平换流器的高压直流系统直流侧故障限流技术研究 [PDF]
全球能源互联网, 2022 基于模块化多电平换流器的高压直流输电技术迅速发展，直流侧短路故障电流的限制与开断困难等问题已然成为研究热点。故障限流技术能够快速限制短路电流的峰值与上升率，为直流断路器的快速隔离提供有利条件。在现有混合式直流断路器基础上，提出2种快速限流的技术方案：新型直流故障限制器与直流断路器配合方案、结合限流电路的混合直流断路器方案。通过限流电感实现故障初期对故障电流上升率的抑制、限流电阻和电容在故障过程中快速投入以及电感限流回路与电容放电回路引入，使得故障电流峰值降低，直流断路器中避雷器的耗能压力继而减小 ...
郝晓弘 +4 more
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500kV直流断路器快速机械开关典型故障特性及可靠性提升方法研究 [PDF]
, 2023 直流断路器是构建柔性直流电网不可或缺的关键设备。快速机械开关是直流断路器中承载电流、实现快速分合闸、耐受分闸恢复电压的核心组件，其结构复杂、动作速度快、电气应力严酷、可靠性要求高，因而设计研制难度大，任一环节出现问题均会影响直流断路器乃至柔直电网的安全可靠运行。然而，目前快速机械开关由于存在设计选型不合理、工艺管控不严格、试验考核不完善等问题，导致在实际工程应用中故障率较高。针对已应用于张北柔性直流电网试验示范工程的500 kV直流断路器，分析了直流断路器研制、调试 ...
张涛 +4 more
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Research on the Design of Operating Condition of Multi-Resistance Superconducting DC Current Limiter [PDF]
, 2023 [Introduction] The working principle of the resistive superconducting current limiter is based on the zero resistance effect of the superconductor, which is connected in series in the line and basically has no resistance during normal operation. When the
Jinchuan GUO, Qin YIN
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Analysis of Current Situation and Future Development of Offshore Wind Power Industry [PDF]
, 2023 [Introduction] Under the trend of accelerating the clean transformation of coastal energy and adjusting the industrial structure, offshore wind power will become an important support for the safe, clean and efficient transformation of power energy in ...
Jiachang LIU +3 more
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Research on Fault Current Controller of DC Microgrid [PDF]
, 2023 [Introduction] With the rapid development of AC/DC distribution networks and distributed generation technology, the role of DC microgrids in distribution networks is becoming increasingly important and will become an important component of future ...
Cong LIN, Fang GUO, Xiangfeng LI
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Research on Protection Scheme of DC Microgrid Integrated with Fault Current Limiting Control Technology [PDF]
, 2023 [Introduction] With the development of new loads, such as distributed power sources and electric vehicles, DC(Direct Current) microgrids have the advantages of fewer commutation links and lower system losses than AC(Alternating Current) microgrids, and ...
Bingyao ZHENG +6 more
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适用于直流配电网故障选线的电力电子变压器分步闭锁方案 [PDF]
, 2023 级联H桥型电力电子变压器（power electronic transformer with cascaded H-bridge，CHB-PET）是柔性变电站的重要组成设备之一，在直流配电网中具有重要作用。当CHB-PET低压直流侧发生双极短路故障后，故障电流上升速度快且幅值较高，易导致电力电子器件迅速闭锁，使低压直流电网保护难以准确获取故障信息。针对CHB-PET低压侧多分支直流配电网，提出一种基于PET分步闭锁的故障穿越策略。当检测到PET低压侧直流系统故障后 ...
于弘洋 +5 more
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Application and Prospect of Flexible Transmission and Distribution Technology in Internet Data Center [PDF]
, 2023 [Introduction] As an important thrust of China's "new infrastructure", internet data centers have ushered in opportunities for vigorous development and become new areas of energy use, putting forward higher requirements for the power supply level and ...
Deyang CHEN +7 more
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Gaoya dianqi, 2023 为了防止柔性直流输电系统在双极短路故障下过大的短路电流损坏输电系统，且考虑到过大的短路电流也会损坏断路器的避雷器，文中提出了一种可开断故障电流且有效减小避雷器吸能的直流断路器。利用PSCAD搭建了含卸能电阻的直流断路器模型和三端±350 k V柔性直流输电系统模型。在双极短路故障下，通过仿真对比分析了此模型与理想直流断路器模型和不含卸能电阻的直流断路器模型的区别。文中发现，含卸能电阻的直流断路器与理想直流断路器相比更容易切断故障电流，与不含卸能电阻的直流断路器相比有效减小了避雷器吸能。并且 ...
田小健, 丁璨, 聂太平, 袁召
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Gaoya dianqi, 2022 高压直流断路器(high voltage DC circuit breaker,HVDC CB)的全开断时间对高压直流输电系统有着至关重要的影响。文中基于人工过零型机械式高压直流断路器对断路器的分断过程进行分段研究，利用L-C回路产生的低频振荡电流模拟开断故障电流，通过PSCAD/EMTDC电磁仿真软件对高压直流断路器的开断过程进行仿真实验，并通过仿真实验探究影响断路器全开断时间的主要因素。结果表明，减少换流支路的电容值、调整避雷器的参考电压以及减小换流回路的投入时刻可以减少高压直流断路器的全开断时间 ...
冯胜, 淡淑恒
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