搜索结果: 1-15 共查到“知识库 动力与电气工程 analysis”相关记录45条 . 查询时间(0.218 秒)
新型节能配电变压器的经济性分析及选型建议(Economic Analysis and Application Advice onthe New Types of Energy-Saving Distribution Transformer )
配电变压器 节能 应用研究
2010/8/17
S13型、S14型和非晶SBH15型变压器都是非晶合金变压器,是具有节能效果的变压器新产品。文章分析了这些变压器的损耗特性,并采用TOC法比较其技术经济性。从与S11型变压器比较的结果可知,非晶SBH15型的空载损耗最低,S13型变压器的负载损耗最低,因此,在使用这些变压器替换已有的变压器时,要根据变压器的用途和费用加以选型。
基于分层模型配电网结构知识表示的拓扑分析方法(A Method of Topological Analysis Based on Structure of Knowledge Representation for Distribution Network of Hierarchical Model)
配电网 知识表示 电网建模 拓扑分析 人工智能
2010/8/17
提出基于分层模型的配电网建模和拓扑分析方法,对配电网的结构知识表示采用了分层处理的方法,整个配电网分为厂站层、线路网络层。其中线路网络层又分成双层树结构,上层树结构表示出线断路器、分段开关、联络开关的逻辑连接关系,下层树结构表示负荷节点与邻近开关的逻辑关系。人工智能的框架表示法,可以方便的完成配电网结构知识表示,并且为实现了基于电网图搜索的拓扑分析方法打下基础,实践表明该方法实现简单,可靠实用。
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SF6 新气痕量杂质气相色谱分析新方法与电力行业SF6 新气推荐标准(A New Trace Impurity Gas Chromatography Analysis Method for SF6 New Gasand Recommended Standard of SF6 New Gas for Electric Power Industry)
SF6新气 痕量杂质 色谱方法 标准
2010/8/17
介绍了一种SF6新气痕量杂质气相色谱分析的新方法。与DL/T 920—2005《六氟化硫中空气、四氟化碳的气相色谱分析方法》相比较,新方法可以从SF6新气中检出更多的痕量杂质,甚至多达17种,且方法高度智能化并便于普及。考虑到SF6新气中某些杂质会影响有关电力设备的使用寿命,提出了电力行业SF6新气推荐标准的方案。
风电场接入电网后的电能质量问题分析(Power Quality Analysis with the Wind Farm Integrating in Power System)
风力发电 电能质量 闪变 谐波
2010/8/17
风电并网运行所引起的电能质量问题如闪变和谐波等随风电比重的增大而日益突出。本文对风电场并网运行产生闪变和谐波的机理进行了分析,再给出计算方法,最后结合实际电网算例对风电场并网运行后的电能质量计算分析方法进行说明。
云广直流工程锁相环功能分析及仿真研究(Analysis and Simulation on Phase Lock Loop Function Used in Yunnan-Guangdong UHVDC Project)
特高压直流输电 锁相环 PSCAD/EMTDC
2010/8/17
介绍了云广特高压直流输电工程锁相环的实现原理,分析了锁相环中几个重要模块的功能和作用;利用PSCAD/EMTDC电磁暂态仿真程序建立了云广工程锁相环模型,研究了锁相环在交流母线频率阶跃、单相故障和三相故障等多种暂态情况下的响应特性。
南方电网低频振荡问题及PSS参数分析(Analysis on Low Frequency Oscillation and PSS Parameters in China Southern Power Grid)
南方电网 小干扰稳定 电力系统稳定器 特征值灵敏度
2010/8/17
采用SSAP电力系统小干扰稳定分析软件,对南方电网2010年典型运行方式下的区间低频振荡模式进行了详细的分析。通过在适当机组加装PSS,并根据灵敏度提供的信息对PSS参数进行优化调整后,系统稳定性得以显著提高。
分布式参数输电线路电磁暂态分析新方法(A Novel Electro-Magnetic Transient Analysis Method for Distributed Parameter Transmission Lines)
电磁暂态分析方法 输电线路 投影变换
2010/8/17
根据函数逼近原理,输电线路的电报方程可以整理为一组正交基的线性组合。文章采用Daubechies正交基,经过投影变换,映像到与依赖于时间变量的和建立在确定架构的函数空间,与输电线路的电压和电流相关的微分方程被转换为代数矢量方程。从而,建立起每一单元的投影等效模型,然后可以在投映域中对输电系统的暂态进行计算。利用EMTP仿真验证了所建议的方法。
Statistical analysis of the blast furnace process output parameter using arima control chart with proposed methodology of control limits setting
ARIMA control chart blast furnace process environmental aspects
2009/10/23
The paper deals with the statistical analysis of the selected parameter of the blast furnace process. It was proved that analyzed measurements have been autocorrelated. ARIMA control chart was selecte...
ENTROPY GENERATION ANALYSIS IN ERROR ESTIMATION OF AN APPROXIMATE SOLUTION: A CONSTANT SURFACE TEMPERATURE SEMI-INFINITE CONDUCTIVE PROBLEM
heat conduction semi-infinite constant surface temperature
2009/10/14
The integral solution of one-dimensional heat conduction in a semi-infinite wall with constant temperature at its surface has been reviewed and compared with the exact solution for three temperature p...
EXERGY ANALYSIS OF SCROLL COMPRESSORS WORKING WITH R22, R407C, AND R417A AS REFRIGERANT FOR HVAC SYSTEM
exergy analysis scroll compressor alternate refrigerant HVAC system
2009/10/14
The rise in crisis of power enthralls the world economically and the options for conventional and non-conventional energy resources have been searched out. No system exists in this world with 100% eff...
ANALYSIS OF THE ENERGETIC/ENVIRONMENTAL PERFORMANCES OF GAS TURBINE PLANT
thermal barrier coatings zirconia gas turbine
2009/10/14
Zirconia stabilized with 8 wt.% Y2O3 is the most common material to be applied in thermal barrier coatings owing to its excellent properties: low thermal conductivity, high toughness and thermal expan...
COMPUTATIONAL ANALYSIS OF MHD FLOW, HEAT AND MASS TRANSFER IN TRAPEZOIDAL POROUS CAVITY
double diffusion porous media heat and mass transfer
2009/10/14
Numerical simulations are conducted for two-dimensional steady-state double diffusive flow in a trapezoidal porous cavity, submitted to axial magnetic field. The Darcy equation, including Brinkmamn an...
Limitations of traditional first-law analysis, based upon thermodynamic performance of process unit coupled with mass and energy balances, are not a serious limitation when dealing with familiar syste...
CONJUGATED HEAT TRANSFER ANALYSIS OF GAS TURBINE VANES USING MACCORMACK'S TECHNIQUE
internal cooling turbine vanes conjugate heat transfer
2009/10/14
It is well known that turbine engine efficiency can be improved by increasing the turbine inlet gas temperature. This causes an increase of heat load to the turbine components. Current inlet temperatu...
EXPERIMENTAL ANALYSIS OF FUZZY CONTROLLED ENERGY EFFICIENT DEMAND CONTROLLED VENTILATION ECONOMIZER CYCLE VARIABLE AIR VOLUME AIR CONDITIONING
energy conservation thermal comfort indoor air quality
2009/10/14
In the quest for energy conservative building design, there is now a great opportunity for a flexible and sophisticated air conditioning system capable of addressing better thermal comfort, indoor air...