基于 NLC 调制的 MMC 多子模块工况模拟测试电路及其控制方法 [PDF]
全球能源互联网, 2020 模块化多电平转换器（MMC）由大量子模块构成，子模块的可靠性对MMC系统的安全可靠运行有着重要影响。特定工况下的可靠性评估表现是子模块设计指标之一，搭建较完整的MMC系统对子模块进行可靠性测试和验证成本高且效率低，因此提出了一种针对多个MMC子模块的工况模拟测试电路及其相应的控制方法。通过设计负载电流控制策略以及增加辅助桥臂、反串子模块及其控制策略，可以使待测子模块的流入电流、电容电压以及开关序列与实际MMC系统中一致。该电路能够同时对多个子模块进行测试，极大地减小了测试电路对直流源电压的要求 ...
杨云霄, 马柯
doaj +1 more source
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
core +1 more source
Study on Maximum Power Tracking Strategy of 10 MW Medium Voltage Six-Phase Direct-Drive Permanent Magnet Wind Turbine [PDF]
, 2022 In order to maximize the grid-connected power of high-power offshore wind turbines, a maximum power tracking strategy suitable for medium voltage six-phase permanent magnet synchronous generator (MVSPMSG) was proposed in the paper based on the use of ...
BAI Ru +5 more
core +1 more source
Research on Flexible Interconnection of Urban Power Grid [PDF]
, 2023 [Introduction] Due to its flexibility and rapid control ability, voltage source converter based high voltage direct current (VSC-HVDC) technology can be used in asynchronous grid interconnection, renewable energy grid-connection, and urban grid power ...
Jinchuan GUO +3 more
core +1 more source
Identification of Low-Voltage Distribution Network Attribution Relationship and Phase Information Based on Density Clustering [PDF]
, 2023 [Introduction] The correct topology information recorded by the power supply department can help the staff monitor the power grid information, analyze the faults, and optimize the operation of the power grid to meet the needs of lean and intelligent ...
Donghui YAN
core +1 more source
, 2023 针对中国第一个海上风电柔性直流送出工程—江苏如东工程，从系统拓扑方案构建、过电压与绝缘配合、系统功率盈余问题与交流故障穿越技术以及控制保护技术等方面开展了深入研究，构建了轻型紧凑化的海上风电柔性直流系统拓扑方案，取消了海上换流站的启动回路与接地回路等；提出了海陆换流站的避雷器配置方案与参考电压的选取原则，形成了海陆换流站的绝缘配合方案的典型范式；提出了集中式、分布式、混合式直流侧有功功率动态平衡装置的典型拓扑方式，解决了陆上换流站交流侧故障穿越难题；提出了工程的整体控制保护方案 ...
卢亚军 +6 more
core +1 more source
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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Electricity Transmission Strategy Research Based on Wind-Coal-Battery-Hydrogen-CCUS Multi Energy Coupling and Bundling System [PDF]
, 2023 [Introduction] In order to guarantee urban power supply and offshore wind power utilization without building new power lines, the paper aims to establish a electricity transmission strategy based on wind-coal-battery- hydrogen -CCUS multi energy coupling
Jiamin YIN +7 more
core +1 more source
柔性直流并入城市电网后对换流站近区短路电流的影响研究 [PDF]
, 2023 大型城市供电电网短路电流已经接近断路器遮断容量，柔性直流接入系统后，会在故障期间提供工作电流，导致交流系统短路电流超标，柔性直流输送功率受限。从柔性直流内外环控制方式及交流系统短路电流计算原理出发，分析得出柔性直流短路电流的幅值和相位对并网点的短路电流影响均较大，其中幅值受外环电流限幅环节的影响易于控制，因此需着重对相位进行控制。基于此提出了一种降低柔性直流输电换流站两端PCC点短路电流的控制策略。以厦门柔性直流工程为例，开发了交直流混合模型，与实测波形对比验证了模型的正确性。通过对不同类型故障下 ...
寇龙泽, 朱琳, 范征, 谷怀广
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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
core +1 more source