Results 11 to 20 of about 5,851 (176)
全球能源互联网, 2018 在分析各种运行方式下高压柔性直流电网控制目标的基础上，提出基于上层控制的高压多换流站协调控制系统架构，在此基础上设计了换流器双极有功、无功和交流电压闭环控制策略，针对柔性直流电网应用，设计了双极协调控制方法，在控制保护仿真系统上进行了动态性能验证，并提出高压直流电网在有、无通信条件下统一的多换流器协调控制策略，控制保护系统联合RTDS组成闭环数模仿真系统，在仿真系统上对多换流器不同通信条件下的统一多换流器协调控制策略进行验证，证明了所提策略的有效性和正确性。
胡兆庆 +5 more
doaj +1 more source
Analysis on Influence Factors of Temporary Overvoltage of Load Rejection Fault of Offshore Wind Power Transmission System of Permanent Magnet Synchronous Generator [PDF]
, 2022 In order to evaluate the temporary overvoltage level of the wind power transmission system based on permanent magnet synchronous generator (PMSG) in case of load rejection, it is necessary to clarify the temporary overvoltage characteristics and its ...
CHEN Qiyu +6 more
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全球能源互联网, 2020 模块化多电平换流器高压直流输电（modular multilevel converter based high voltage direct current，MMCHVDC）系统中链路延时对系统动态性能影响较大，如果延时设计不合理，会导致系统的稳定性变差。随着电压等级的提升，子模块数量相应增加，如何降低控制及保护的延时成为挑战。研究分析昆柳龙直流工程柳北换流站极1换流阀阀控下行、过流保护和上行3种链路延时的组成，提出了相应的测试方法，完成测试并提出优化方向。阀控下行、过流保护和上行链路延时分别小于40 ...
胡煜 +4 more
doaj +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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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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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
Effects of landscape fragmentation on floodplain fishes as revealed by species–habitat networks
Conservation Biology, Volume 40, Issue 1, February 2026.Abstract How species interact with habitat patches is influenced primarily by habitat configuration (e.g., connectivity) and species’ functional traits. As levels of fragmentation increase, identifying the intricate connections between these components is crucial for biodiversity conservation.
Chen Zhang +8 more
wiley +1 more source
Probability Safety Analysis of Simplified CPR1000 Main Feedwater System and AP1000 Passive Containment Cooling System [PDF]
, 2016 随着数字化仪控系统在核电厂中得到越来越多的应用，其可靠性对核电安全也越来越重要。传统概率安全分析方法已在模拟仪控系统中得到广泛应用，但在分析具有新设备和新技术的数字化仪控系统时还存在不足。动态概率安全分析方法中，Markov/CCMT是较为符合数字化仪控特性的概率安全分析方法之一。 本文主要是应用故障树、Markov和Markov/CCMT三种方法对简化CPR1000主给水系统和简化AP1000非能动安全壳冷却系统分别进行安全分析，其中简化CPR1000主给水系统在设置故障时偏重于数字类故障 ...
侯恩通
core
The Genome of Phoebe zhennan (Lauraceae) and Comparative Genomics of Phoebe 楠木(樟科)基因组与楠属植物比较基因组学研究
Integrative Conservation, Volume 4, Issue 4, Page 584-599, December 2025.Phoebe zhennan is a Chinese endemic and valuable timber species of Phoebe (Lauraceae). We present a chromosome‐level genome assembly of P. zhennan. Our research provides novel insights into the genome evolution of Phoebe, including whole‐genome duplication, phylogenetic relationships of magnoliids, and key MYB regulatory genes involved in lignin ...
Mao Yameng +3 more
wiley +1 more source
Research on GOOSE Communication for Low-voltage Bus Protection in Digital Substation [PDF]
, 2011 以某数字化变电站改造工程为研究对象,在10 kV母线段增加简易母线保护,并采用gOOSE网络通信机制取代传统保护之间的锁联信号,解决了传统方式下各个出线保护和分段保护与简易母线保护之间存在较多硬开入连线,二次回路复杂的问题,提高了简易母线保护的可靠性,同时解决了原来控制保护系统存在的保护死区、开关失灵等问题。One digital substation reconstruction project is taken as the research subject,where simple bus ...
余臻, 游晔, 黄皓
core