Results 11 to 20 of about 1,127,818 (183)
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, 谷怀广, 朱琳, 范征
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, 2023 为提升远海风电对称双极柔性直流送端交流系统单相接地故障和两相短路故障工况（第一类故障）下的功率输送能力，以及三相接地故障工况（第二类故障）的交流电压稳定性，提出海上换流站协调控制策略。首先分析了第一类故障的过电压和极间环流产生机理，以及第二类故障的交流电压失稳机理。在此基础上，提出了功率平衡控制策略和输出有功电流策略。第一类故障下定电压控制极采用限压策略，功率平衡控制策略抑制极间环流，增大定电压控制极的功率，减少了交流电压控制器响应时间，提升了功率输送能力。第二类故障工况下 ...
黄海 +4 more
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, 2023 近年来电池储能以其响应速度快、能量密度高等优点，在电力系统中发挥重要作用。为满足实际应用的要求，电池储能系统需要将电池或电池组并联从而达到较高的可用容量，但并联电池在实际中受内阻、容量、荷电状态 （SOC）等影响将出现电流不平衡现象，一定程度上制约了电池充放电电流和使用条件，影响了电池性能。针对并联电池组支路电流采集过程繁琐且状态估计复杂的情况，以电池的二阶等效电路为基础，结合回路电流法建立了并联电池组的仿真模型。模型能够根据锂电池的性能参数及状态方程实现并联支路电流的计算，进而估计并联电池组的状态 ...
张彩萍 +5 more
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Dianci bileiqi, 2021 针对中性点经消弧线圈接地方式的不对称配电网发生高阻接地故障时选线难的问题,首先建立了经消弧线圈系统发生高阻接地的电路模型,对不同不对称度下不同阻值接地故障的故障线路与非故障线路的零序电流及零序电流5次谐波进行定量分析,随之提出一种阻性电流增量的方法,即在中性点加入阻性电流,该阻性电流通过大地流入到故障点使故障线路零序电流增大,最后通过MATLAB/SIMULINK软件仿真验证该方法的正确性。通过仿真及定量分析表明:配电网经消弧线圈接地方式发生高阻接地故障时,零序电流5次谐波随着不对称度的增大 ...
洪书文 +4 more
doaj
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Engineering of the catalyst interface and modulation of transition–metal d–band play critical roles in the electrocatalytic hydrogen evolution reaction (HER). Herein, a synthetic strategy is developed to fabricate nitrogen‐doped carbon nanotubes (N–CNTs)–supported Ni3Se4–CeO2 heterojunction catalysts through a facile chemical vapor deposition (
Zhiqiang Sun +10 more
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Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Te‐free BiSbSe3 is a promising medium‐temperature thermoelectric (TE) material owing to its cost‐effectiveness and intrinsically low lattice thermal conductivity. However, its comparatively low electrical conductivity has severely hindered the optimization of TE performance.
Xiaowei Shi +10 more
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Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Low‐temperature lithium‐metal batteries (LT‐LMBs) are increasingly pursued for higher energy density and extended cycle life, yet suffer from severely depressed interfacial Li+ desolvation/diffusion kinetics due to the enlarged solvation structures as well as organic electrolyte solidification, ultimately inducing much higher barriers to ...
Shikai Yin +14 more
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Structural Modulation of Magnetic Softness in Fe‐Based Amorphous Alloys via Pulse Current Training
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Fe‐based amorphous alloys, despite their intrinsically low magnetocrystalline anisotropy, suffer from quasi‐dislocation dipoles and localized stress fields that impede domain‐wall motion and increase coercivity. Here, we introduce pulse current training (PCT) as an energy‐efficient technique to overcome these limitations in a Fe76Si9B10P5 ...
Shumin Ye +13 more
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Lithium Deposition Behavior of Reconstituted Two‐Dimensional Zeolite Y Separators
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT During the operation of lithium‐ion batteries, uncontrollable lithium dendrite growth often occurs, resulting in internal short circuits and a significant reduction in cycle life, which poses a major obstacle to their practical application.
Yingying Deng +9 more
wiley +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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