搜索结果: 1-15 共查到“动力与电气工程 Study”相关记录29条 . 查询时间(0.406 秒)
Stanford study shows how to improve production at wind farms(图)
Stanford improve production wind farms
2019/10/23
Solitary wind turbines produce the most power when pointing directly into the wind. But when tightly packed lines of turbines face the wind on wind farms, wakes from upstream generators can interfere ...
Energy Harvested from Evaporation Could Power Much of U.S.,Says Study(图)
Energy Harvested Evaporation Power Much U.S.
2017/10/24
In the first evaluation of evaporation as a renewable energy source, researchers at Columbia University find that U.S. lakes and reservoirs could generate 325 gigawatts of power, nearly 70 percent of ...
Study Finds ‘Smart’ Transformers Could Make Reliable Smart Grid a Reality
Smart Transformers Smart Grid
2017/7/24
The feasible equilibria of operation of distribution-level power system models interfaced with solid-state transformers (SST) are analyzed and presented through a set of analytical relationships. The ...
Study shows tectonic plates not rigid, deform horizontally in cooling process(图)
cooling process rigid
2014/12/1
The puzzle pieces of tectonic plates that make up the outer layer of the earth are not rigid and don't fit together as nicely as we were taught in high school.
MIT study investigates power generation from the meeting of river water and seawater(图)
investigates power generation river water and seawater
2014/8/26
Where the river meets the sea, there is the potential to harness a significant amount of renewable energy, according to a team of mechanical engineers at MIT.
基于全网协调优化的广东500 kV电网控制方案(Study on Optimized Coordinating Security and Stability Control Scheme of 500 kV Guangdong Power Grid)
协调优化 安全稳定控制 运行方式 500 kV电网
2010/8/17
分析了南方电网的送入直流及相关重要500 kV线路N-2故障,提出了省、网间协调优化的原则和建议,制定了广东500 kV电网安全稳定控制方案:广东电网安稳控制系统仅通过广东罗洞主站接受南网罗洞主站发送的切负荷命令,与南方电网其余的通信断开备用,并采取快速切除元件、改变运行方式等措施,以实现了三道防线间的优化配合。该方案简洁有效,且易于运行。
提高广东架空送电线路输送容量研究(Study on Raising Transmission Capacity of Overhead Transmission Line in Guangdong Power Grid )
架空线路 输送容量 环境温度 跨越距离 正常允许电流 特殊允许电流
2010/8/17
阐述架空导线载流控制条件,分析广东架空送电线路实际运行条件和广东地区多年实测气象参数,制定广东架空线路正常运行允许电流I0,通过风险分析证实现有线路正常载流能力可安全地提高7%以上。在正常允许电流I0的基础上,挖掘运行线路跨越距离裕度,提出架空线路在检修、应急两种特殊运行条件下的允许电流I1、I2及其确定原则,通过对实际线路开展测量和验算,确认电网特殊情况下存在安全增容的可能性,特定线路可以多输送...
云广直流输电工程换流阀多重阀单元(Study on the Multiple Valve Unit Test of Yunnan-Guangdong UHVDC Transmission Project)
特高压直流输电 换流阀 型式试验 多重阀单元
2010/8/17
云广±800 kV直流输电工程用换流阀是世界上第一个特高压直流输电用晶闸管换流阀,其型式试验尚无成熟的具体规范和要求。与±500 kV及以下高压直流输电换流阀不一样,这种特高压换流阀是由2个12脉动的换流阀组串联组成,也不能简单地照搬前者的试验规范和要求。鉴此,重点讨论多重阀单元(MVU)类型Ⅲ(MVU连接在DC 600 kV与800 kV之间)的试验方法,确定型式试验方案为:选择短接试验法;短接...
±800 kV特高压直流工程直流滤波器设计(Study on the Key Issues of DC Filter Design for ±800 kV UHVDC Transmission Projects)
特高压直流 直流滤波器 谐振 暂态定值
2010/8/17
依据±500 kV高压直流输电工程直流滤波器设计经验,研究分析了±800 kV特高压直流输电工程直流滤波器设计需要考虑的关键问题,包括:直流侧谐振,直流滤波器可能发生的典型故障;介绍了用于计算直流滤波器典型故障的模型和方法。以云广±800 kV特高压直流输电工程为例,对直流侧谐振进行了校核,对直流滤波器设备暂态定值进行了计算。研究结果表明,云广±800 kV特高压直流输电工程直流滤波器设计是合理的...
糯扎渡特高压直流规模对广东电网影响研究(Study on Nuozhadu UHVDC Transmission Project’s Capacity Affecting the Guangdong Power Grid)
特高压直流 输电规模 多馈入直流 稳定性
2010/8/17
根据广东电网规划,研究糯扎渡特高压直流输电工程采用5 000 MW和6 400 MW两种输电规模对广东电网安全性,稳定性的影响,并分析不同直流规模对广东电源、电网发展的适应性。建议糯扎渡直流规模采用5000 MW。
2009年广东电网动态稳定问题分析研究(Study of Dynamic Stability Problem in Guangdong Power Grid in 2009)
动态稳定 PSS 增益 励磁系统 负荷模型
2010/8/17
以2009年广东电网夏季大方式及小方式数据为基础,研究了广东电网内的弱阻尼振荡模式,对重要地区机组的PSS投、退进行了灵敏度分析,揭示了广东电网内动态稳定性薄弱的地区,优化了广蓄B厂机组PSS增益定值,另外,采用综合负荷模型,对广东电网内振荡模式及广东电网与外网区域振荡模式进行了研究,并同静态负荷模型结果进行了对比,给广东电网PSS现场试验、运行及励磁参数实测工作提供了依据。
分数阶PID控制器用于STATCOM控制研究(Study of Fractional Order PID Controllers for STATCOM)
遗传粒子群优化 FOPID 鲁棒性 静止同步补偿器 电力系统
2010/8/17
分数阶PID(FOPID)控制器是一种微分阶与积分阶是分数的PID控制器,其设计关键在于如何设定FOPID的5个重要控制参数。文章采用遗传粒子群优化(GAPSO)算法来设计FOPID控制器,并定义了一种新的代价函数以便在整个时域范围内加快控制参数的搜索过程。与常规PID控制器的仿真对比表明:在模型不确定时,所设计的FOPID控制器能大大提高控制系统的鲁棒性。
Study of Heat Transfer in Concentric Annulus Flow by Liquid-Crystal Technique
Horizontal Concentric Annular Flow Heat Transfer Coefficient Liquid-Cyrstal Technique
2009/10/15
Study of Heat Transfer in Concentric Annulus Flow by Liquid-Crystal Technique
Abstract: In this, forced convection heat transfer on the inner surface in horizontal concentric annular duct flow was ex...
EXPERIMENTAL AND SCALE UP STUDY OF THE FLAME SPREAD OVER THE PMMA SHEETS
flame spread pilot ignition polymethylmethacrylate
2009/10/14
To explore the flame spread mechanisms over the solid fuel sheets, downward flame spread over vertical polymethylmethacrylate sheets with thicknesses from 1.75 to 5.75 mm have been examined in the qui...
IMPROVING ECO-SUSTAINABLE CHARACTERISTICS AND ENERGY EFFICIENCY OF EVAPORATIVE FLUID COOLER VIA EXPERIMENTAL AND NUMERICAL STUDY
evaporative fluid cooler experimental study numerical integration
2009/10/14
This paper presents an on-going research project that aims to identify possibilities for wider use of evaporative cooling in process industry, especially the use of evaporative fluid cooler units. Exp...