Results 41 to 50 of about 2,074 (132)

Sub-Synchronous Oscillation Suppression Based on VSG Virtual Impedance Feasible Domains [PDF]

open access: yes
[Objective] The virtual synchronous generator (VSG) system exhibits negative damping characteristics under weak grid connection, which triggers subsynchronous oscillations and leads to system instability.
Qin SUN, Yi DU, Yuxin SUN
core   +1 more source

基于多智能体一致性理论的智能电网内分布式储能系统自治控制方法

open access: yesGaoya dianqi
针对智能电网中不同电网阻抗差异性引起各电网内分布式储能一次下垂控制器响应速度不一致,且下垂控制方法种类多(P-f/Q-U下垂、改进P-f/Q-U下垂和改进P-U/Q-f下垂等)难以协调,控制器设计复杂等问题,文中提出了一种基于多智能体一致性理论的智能电网内分布式储能系统自治控制方法,以实现不同下垂控制方式的高效协调,有效提升分布式储能PCC处电压频率控制效果,以及各储能系统的精确功率分配。首先,该方法深入研究了不同阻抗电网条件下的分布式储能控制下垂模型,并采用分布式控制理论 ...
张亮亮
doaj  

Energy Storage Configuration Considering the System Wind Power Reserve Capacity Under High Wind Power Permeability [PDF]

open access: yes
The high proportion penetration of the wind power weakens the inertia and frequency regulation capacity of the power system. The energy storage system (ESS) is widely used in the inertia support and frequency regulation of the power grid with the ...
LIU Hongbo   +4 more
core   +1 more source

基于MPC的轮毂电机驱动电动汽车垂向振动研究

open access: yesZhendong Ceshi yu Zhenduan
针对轮毂电机驱动电动汽车不平衡电磁力引起的垂向振动恶化问题,提出一种基于模型预测控制(model predictive control, 简称MPC)理论的半主动悬架控制方法。首先,建立由轮毂电机和空气悬架(hub motor‑air suspension, 简称HM‑AS)系统组成的轮毂电机驱动电动汽车七自由度半车模型,并基于随机路面进行实车试验来验证模型的准确性;其次,根据车辆综合性能指标构建成本函数,以悬架动行程和可调阻尼减振器生成的阻尼力为约束条件,建立模型预测控制器;最后 ...
doaj   +1 more source

钻井液DPSK信号解调及旋转阀控制脉冲重构

open access: yesShiyou jixie, 2014
基于钻井液压力DPSK信号调制过程的数学分析,研究了钻井液压力DPSK信号相干解调的可行性。通过在相位相干解调的基础上增加反余弦和求导环节实现旋转阀控制脉冲的重构,钻井液压力DPSK信号可以采用相干方式进行解调,且无噪声影响条件下解调效果较好。 仿真分析结果表明,噪声会对钻井液压力DPSK信号的幅度和相位产生干扰,对旋转阀控制脉冲的重构造成较大影响;旋转阀控制脉冲的重构受到信号频带内噪声垂直分量导数的严重影响;大幅提高输入信号信噪比是钻井液压力DPSK信号相干解调系统获得相对较小误码率的关键。
沈跃   +5 more
doaj  

基于地震波叠加模式的空间域划分及质点运动空间差异—以SV波入射为例

open access: yesDizhen xuebao, 2019
针对地震动空间差异问题,以半无限空间内平面SV波入射为例,采用波动理论和叠加原理相结合的方法研究地震动的空间特征。首先,分析入射波和反射波在空间内形成质点运动的叠加模式差异,并依此对空间域进行划分;其次,针对不同泊松比和SV波入射角情形研究叠加区与分离区的分界线控制情况;最后,对比分析不同空间域内的质点运动在峰值、持时等方面的特征。研究结果显示:当SV波入射时,叠加区与分离区的分界线通常由z3 (反射P波与反射SV波的分离线)控制;同时存在两种特殊情况,当SV波垂直入射时,分界线由z1 ...
Weiping He, Yihong Zhou
doaj   +1 more source

Research on Reconfiguration Strategy of Distributed Distribution Network With Self-Healing Performance Under High-Proportion Renewable Energy Access [PDF]

open access: yes
ObjectivesAs the proportion of renewable energy in power grids increases year by year, the volatility and uncertainty of the grid are significantly heightened, posing challenges to the safe operation of distribution networks.
HUANG Yijun, WU Renbo
core   +1 more source

黄土高原地区黄土裂隙发育特征及其规律研究

open access: yesShuitu Baochi Xuebao, 2005
黄土中存在大量不同规模、不同成因、不同性质和不同时期的裂隙,不同裂隙之间的互相穿插、切割形成立体的网络裂隙系统。这些裂隙是分割黄土的结构面,是侵蚀土壤、洞穴的优势面,是孕育地质灾害的控制和分离面,是地下水的运移通道和储存场所,对其进行研究具有重要的科学和工程实践意义。本文对黄土裂隙进行了综合分类,系统总结了黄土高原地区自然营力作用下不同黄土裂隙的基本特征和发育规律,认为通常意义的黄土垂直节理主要是由黄土中的一部分不同成因的原生和次后期的垂向裂隙在黄土堆积过程中逐渐“生长”而成的。
卢全中 彭建兵 陈志新 李喜安
doaj   +2 more sources

A Frequency Regulation Method of Energy Storage System Based on Adaptive Adjustment of Virtual Synchronous Generator Control Parameters [PDF]

open access: yes
ObjectivesThe large-scale penetration of wind power has reduced the frequency regulation capability of the power system to a certain extent.As a relatively mature and effective technical means, the energy storage system is widely used in power grid ...
LI Bo   +4 more
core   +1 more source

High Voltage Crossing Strategy of Wind Farm Considering Active and Reactive Coordinated Recovery [PDF]

open access: yes
ObjectivesTo address the serious high voltage ride-through (HVRT) problem faced by wind farms as a result of the large voltage surge at the grid-connected point after a DC fault, a recovery mechanism of “active priority balancing - reactive power dynamic
HAN Lu   +4 more
core   +1 more source

Home - About - Disclaimer - Privacy