Results 21 to 30 of about 2,074 (132)
Droop Control Strategy of Distributed Photovoltaic Reactive Power Considering Probability Distribution [PDF]
Distributed photovoltaic access to the distribution network has gradually become a trend, but the large-scale distributed photovoltaic grid connection will cause serious power flow reversal, resulting in out-of-limit voltage and network loss increase ...
DAI Jianfeng +5 more
core +1 more source
Power Coordinated Control Strategy for Grid-Connected DC Microgrid Considering State of Charge [PDF]
ObjectivesExisting research on decentralized coordinated control strategies mainly focuses on power distribution within DC microgrid, with limited consideration given to the operation of grid-connected DC microgrids.
LI Hailong +6 more
core +1 more source
Gaoya dianqi, 2017 微网孤岛工况下,采用灵活的控制方式提高系统供电可靠性与电能质量,具有深远的研究意义。文中分析了微电源的下垂控制特性,建立了无互联线的多微源并联控制系统。各微源根据P-f和Q-U下垂特性独立控制其输出的有功功率和无功功率,保障微网内的功率平衡;利用小信号法建立了逆变器并联系统的数学模型,设计出下垂控制参数,建立了等容量与异容量双微源并联微网仿真系统,验证了下垂控制方法的可行性及下垂参数选取的合理性。通过单微源实验,对下垂特性进行了实验验证,通过理论分析,计算实时监测反馈数据,与实验波形显示参数进行对比验证,
胡勋, 万媛, 胡博, 董玮
doaj
Grid-connected control strategy of GFM inverter in solar-powered ship photovoltaic system [PDF]
Objective The paper aims to solve the problem of the overall stability of the ship's power system being reduced due to the use of grid-following (GFL) control for grid connection in existing solar ship photovoltaic (PV) power generation systems ...
Chunhua ZHAO +2 more
core +1 more source
Multi-Machine Cooperative Control Strategy of Wind Farm Participating in Power Grid Frequency Modulation [PDF]
ObjectivesConsidering the difference of primary frequency regulation ability of wind turbines under different wind conditions in wind farms, the evaluation method of frequency regulation capability of wind turbines was optimized on the basis of sag ...
HAO Sipeng +4 more
core +1 more source
Gaoya dianqi, 2018 当低压微电网由并网过渡到孤岛运行时会出现功率缺额的现象,导致微电网无法保持电压和频率稳定。文中提出了双重下垂控制的策略,即在改进耦合下垂控制同时,又增加一层对于直流总线电压响应的下垂控制。该控制策略能够在这孤岛模式和并网模式下工作,实现自动调节微电源的输出功率。此外,该控制策略还解决了孤岛模式和并网模式之间的切换不平滑的问题。对提高微电网的电能质量和供电可靠性具有重要意义。以上所提出的控制策略通过MATLAB仿真验证其有效性。
汪玉凤, 李琳, 王立辉, 张志强
doaj
Review of Grid-Forming Energy Storage and Its Applications [PDF]
ObjectivesThe characteristics of low inertia and low damping in “double-high” (high renewable energy penetration and high power electronics application) power system pose significant challenges to grid stability, particularly in terms of frequency and ...
FAN Xuejun, LI Yalou, ZHAO Fei
core +1 more source
Gaoya dianqi, 2017 微电网中传统的下垂控制方法能够实现多电压型逆变器的并联,但难以实现功率的精确分配。文中提出一种基于递推最小二乘法的改进下垂控制方法:首先利用单向低速通信线获取交流母线电压参数后,在本地采用在线递推最小二乘法获得准确线路参数;然后在引入的功率等效阻抗概念基础上,考虑线路参数及本地负荷对多逆变器功率分配的影响,求出准确补偿功率传输参数不匹配情况的虚拟阻抗值,最终可实现多逆变器功率精确分配。MATLAB仿真结果表明:该策略可及时响应本地负荷变动,功率分配效果及动态性能均优于传统下垂控制。
许钒, 胡长斌, 王斐然, 王弋飞
doaj
Research on Operation Strategy of Virtual Power Plant and Distributed Control of DG [PDF]
ObjectivesVirtual power plant is usually composed of distributed generator (DG). When the system lacks power grid support, practical and reasonable comprehensive operation strategies and accurate control methods are needed to ensure the smooth operation ...
CAO Shengxian +3 more
core +1 more source
Shiyou jixie, 2015 为了打破国外公司在自动垂直钻井工具方面的技术封锁，实现在高陡地层的防斜打快，研制了全旋转推靠式自动垂直钻井工具。该工具在旋转的情况下，通过测量模块完成井身轨迹的井斜角和方位角等信息测量。井下微处理器将其与预置的井眼轨迹参数进行比较，当井斜角超过规定范围，通过井下小闭环自动控制系统限定工具内部控制轴的方向，从而使执行矩形推力板旋转到高边时张开并推靠上井壁，实现工具的纠斜功能。在执行机构矩形推力板交替推出时，则实现了工具的稳斜功能。试验验证工具性能达到设计要求，工具在井斜角小于等于1 ...
王闻涛 +6 more
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