电力系统具有良好的稳定性是保证电网正常运行的关键,充分应用Power World Simulator电力系统仿真软件对我国西北某地区实际电网进行安全稳定性分析。根据给定的实际电网运行数据搭建电网模型并进行潮流计算,将潮流计算结果与静态安全...电力系统具有良好的稳定性是保证电网正常运行的关键,充分应用Power World Simulator电力系统仿真软件对我国西北某地区实际电网进行安全稳定性分析。根据给定的实际电网运行数据搭建电网模型并进行潮流计算,将潮流计算结果与静态安全理论相结合,对该地区电网模型进行N-1静态安全性分析。针对线路负载率过高以及节点母线电压越限的情况,提出解决措施以达到提高电网运行稳定性的目的。展开更多
电力系统分析课程中有些概念抽象,不容易通过实际演示来完成,使得本门课程教与学都变得困难起来。采用具有可视化图形用户界面的Power World Simulator软件,可以很好地解决这些问题。文章介绍了这款全英文免费的软件,根据一个14节点电...电力系统分析课程中有些概念抽象,不容易通过实际演示来完成,使得本门课程教与学都变得困难起来。采用具有可视化图形用户界面的Power World Simulator软件,可以很好地解决这些问题。文章介绍了这款全英文免费的软件,根据一个14节点电力系统原型,建立了可视化的模型,使用该软件演示了潮流计算和短路计算等难点问题,显示了该软件给电力系统分析课程教与学带来的好处。展开更多
将可视化软件Power World Simulator应用于电力系统暂态稳定性仿真,介绍了仿真的步骤和发电机模型库,建立IEEE-3机9节点系统,先求得系统的潮流分布,然后选择发电机、励磁系统和稳定器的类型,设置三相短路故障,完成暂态稳定性仿真。通过...将可视化软件Power World Simulator应用于电力系统暂态稳定性仿真,介绍了仿真的步骤和发电机模型库,建立IEEE-3机9节点系统,先求得系统的潮流分布,然后选择发电机、励磁系统和稳定器的类型,设置三相短路故障,完成暂态稳定性仿真。通过分析和对比发电机6阶、5阶实用模型和经典2阶数学模型时的仿真结果,验证了暂态稳定性仿真结果的有效性。展开更多
Based on a detailed analysis of China's current power installed capacity,power generation,power structure,as well as the world's power installed capacity,power generation,power structure,and power regional dis...Based on a detailed analysis of China's current power installed capacity,power generation,power structure,as well as the world's power installed capacity,power generation,power structure,and power regional distribution,some policy suggestions have been put forward through objective analysis and comparison.Firstly,power sectors in China should develop from high-speed growth to high-quality development,digest power excessive production capacity,control newly-added production capacity absolutely,and control the construction of power points orderly according to power planning.Secondly,non-fossil energy power generation needs to develop energetically,and should attach great importance to biomass power generation,in addition to gas power generation,wind power,and solar power.Lastly,on the basis of building a moderately prosperous society in all respects,electricity consumption per capita should be improved in the high-quality development stage in China,and the development of energy conservation and emission reduction,renewable energy,and distributed energy and so on should be considered collaboratively.展开更多
The Northwest Electric Power Design Institute (NWEPDI) located in Xi’an City, Shaanxi Province, China, was established in 1956. There are now 1,742 staff, including 1,234 engineers in more than 30 specialities as fol...The Northwest Electric Power Design Institute (NWEPDI) located in Xi’an City, Shaanxi Province, China, was established in 1956. There are now 1,742 staff, including 1,234 engineers in more than 30 specialities as follows: thermo-mechanical, coal handling, ash handling, electrical (main and secondary circuits), auxiliary power supply, illumination, I & C, architecture, structure, heating & ventilation, plant general layout, HVAC, water supply & discharge, hydrostructure, chemical water treatment, waste water treatment, technical-economics, construction organization design, environmental impact assessment,展开更多
The reform and opening has given impetus to the rapid development of China’s stone industry, laying the foundations for its development to a higher level, and for the realization of the development target of a powerf...The reform and opening has given impetus to the rapid development of China’s stone industry, laying the foundations for its development to a higher level, and for the realization of the development target of a powerful stone producer in the world by the year 2010. Its major features are as follows: 1. Production of major products in China’s stone industry has witnessed significant growth, leaping to second place in the world and ranking among the world’s major stone producers. In 1995, total production of the national granite slabs, marble slabs, terazzos展开更多
On January 7-9, 2008, the feasibility research reporton the IGCC demonstration project of 4×200 MW inTaiyangzhou, Dongguan passed examination. This projectmay start within the year and is scheduled to put intoope...On January 7-9, 2008, the feasibility research reporton the IGCC demonstration project of 4×200 MW inTaiyangzhou, Dongguan passed examination. This projectmay start within the year and is scheduled to put intooperation in 2011. It will alleviate Dongguan City展开更多
The first phase project of Huitengxile Wind Power Generation Farm in Inner Mongolia, with nine 600 kW wind power generators installed, was formally put into commercial operation on November 28,
如何有效地进行资源定位是影响广域网内分布式系统性能的重要因素,已有的一些资源查找算法引入了小世界原理来提高定位效率和降低网络负载,但没有较好解决小世界网络的构造问题。在Kleinberg小世界模型的基础上,利用幂率网络特性,提出...如何有效地进行资源定位是影响广域网内分布式系统性能的重要因素,已有的一些资源查找算法引入了小世界原理来提高定位效率和降低网络负载,但没有较好解决小世界网络的构造问题。在Kleinberg小世界模型的基础上,利用幂率网络特性,提出了一个小世界网络的构造方法PLSWCP(Power Law oriented Small World Construction Protocol),并给出了该方法的数学分析和实现。该方法是分布式的,不必拥有全局知识,每个节点只需维护局部视图,即可使资源定位具有小世界特征所带来的优化的时间复杂度。分析和实验结果表明,该方法可以提高资源定位的效率,具有良好的扩展性,自适应性和负载均衡性。展开更多
Complex hypernetworks are ubiquitous in the real system. It is very important to investigate the evolution mecha- nisms. In this paper, we present a local-world evolving hypernetwork model by taking into account the h...Complex hypernetworks are ubiquitous in the real system. It is very important to investigate the evolution mecha- nisms. In this paper, we present a local-world evolving hypernetwork model by taking into account the hyperedge growth and local-world hyperedge preferential attachment mechanisms. At each time step, a newly added hyperedge encircles a new coming node and a number of nodes from a randomly selected local world. The number of the selected nodes from the local world obeys the uniform distribution and its mean value is m. The analytical and simulation results show that the hyperdegree approximately obeys the power-law form and the exponent of hyperdegree distribution is 7 = 2 ＋ 1/m. Furthermore, we numerically investigate the node degree, hyperedge degree, clustering coefficient, as well as the average distance, and find that the hypemetwork model shares the scale-flee and small-world properties, which shed some light for deeply understanding the evolution mechanism of the real systems.展开更多
文摘电力系统具有良好的稳定性是保证电网正常运行的关键,充分应用Power World Simulator电力系统仿真软件对我国西北某地区实际电网进行安全稳定性分析。根据给定的实际电网运行数据搭建电网模型并进行潮流计算,将潮流计算结果与静态安全理论相结合,对该地区电网模型进行N-1静态安全性分析。针对线路负载率过高以及节点母线电压越限的情况,提出解决措施以达到提高电网运行稳定性的目的。
文摘电力系统分析课程中有些概念抽象,不容易通过实际演示来完成,使得本门课程教与学都变得困难起来。采用具有可视化图形用户界面的Power World Simulator软件,可以很好地解决这些问题。文章介绍了这款全英文免费的软件,根据一个14节点电力系统原型,建立了可视化的模型,使用该软件演示了潮流计算和短路计算等难点问题,显示了该软件给电力系统分析课程教与学带来的好处。
文摘将可视化软件Power World Simulator应用于电力系统暂态稳定性仿真,介绍了仿真的步骤和发电机模型库,建立IEEE-3机9节点系统,先求得系统的潮流分布,然后选择发电机、励磁系统和稳定器的类型,设置三相短路故障,完成暂态稳定性仿真。通过分析和对比发电机6阶、5阶实用模型和经典2阶数学模型时的仿真结果,验证了暂态稳定性仿真结果的有效性。
文摘Based on a detailed analysis of China's current power installed capacity,power generation,power structure,as well as the world's power installed capacity,power generation,power structure,and power regional distribution,some policy suggestions have been put forward through objective analysis and comparison.Firstly,power sectors in China should develop from high-speed growth to high-quality development,digest power excessive production capacity,control newly-added production capacity absolutely,and control the construction of power points orderly according to power planning.Secondly,non-fossil energy power generation needs to develop energetically,and should attach great importance to biomass power generation,in addition to gas power generation,wind power,and solar power.Lastly,on the basis of building a moderately prosperous society in all respects,electricity consumption per capita should be improved in the high-quality development stage in China,and the development of energy conservation and emission reduction,renewable energy,and distributed energy and so on should be considered collaboratively.
文摘The Northwest Electric Power Design Institute (NWEPDI) located in Xi’an City, Shaanxi Province, China, was established in 1956. There are now 1,742 staff, including 1,234 engineers in more than 30 specialities as follows: thermo-mechanical, coal handling, ash handling, electrical (main and secondary circuits), auxiliary power supply, illumination, I & C, architecture, structure, heating & ventilation, plant general layout, HVAC, water supply & discharge, hydrostructure, chemical water treatment, waste water treatment, technical-economics, construction organization design, environmental impact assessment,
文摘The reform and opening has given impetus to the rapid development of China’s stone industry, laying the foundations for its development to a higher level, and for the realization of the development target of a powerful stone producer in the world by the year 2010. Its major features are as follows: 1. Production of major products in China’s stone industry has witnessed significant growth, leaping to second place in the world and ranking among the world’s major stone producers. In 1995, total production of the national granite slabs, marble slabs, terazzos
文摘On January 7-9, 2008, the feasibility research reporton the IGCC demonstration project of 4×200 MW inTaiyangzhou, Dongguan passed examination. This projectmay start within the year and is scheduled to put intooperation in 2011. It will alleviate Dongguan City
文摘The first phase project of Huitengxile Wind Power Generation Farm in Inner Mongolia, with nine 600 kW wind power generators installed, was formally put into commercial operation on November 28,
文摘如何有效地进行资源定位是影响广域网内分布式系统性能的重要因素,已有的一些资源查找算法引入了小世界原理来提高定位效率和降低网络负载,但没有较好解决小世界网络的构造问题。在Kleinberg小世界模型的基础上,利用幂率网络特性,提出了一个小世界网络的构造方法PLSWCP(Power Law oriented Small World Construction Protocol),并给出了该方法的数学分析和实现。该方法是分布式的,不必拥有全局知识,每个节点只需维护局部视图,即可使资源定位具有小世界特征所带来的优化的时间复杂度。分析和实验结果表明,该方法可以提高资源定位的效率,具有良好的扩展性,自适应性和负载均衡性。
基金Project supported by the National Natural Science Foundation of China(Grant Nos.71071098,91024026,and 71171136)supported by the Shanghai Rising-Star Program,China(Grant No.11QA1404500)the Leading Academic Discipline Project of Shanghai City,China(Grant No.XTKX2012)
文摘Complex hypernetworks are ubiquitous in the real system. It is very important to investigate the evolution mecha- nisms. In this paper, we present a local-world evolving hypernetwork model by taking into account the hyperedge growth and local-world hyperedge preferential attachment mechanisms. At each time step, a newly added hyperedge encircles a new coming node and a number of nodes from a randomly selected local world. The number of the selected nodes from the local world obeys the uniform distribution and its mean value is m. The analytical and simulation results show that the hyperdegree approximately obeys the power-law form and the exponent of hyperdegree distribution is 7 = 2 ＋ 1/m. Furthermore, we numerically investigate the node degree, hyperedge degree, clustering coefficient, as well as the average distance, and find that the hypemetwork model shares the scale-flee and small-world properties, which shed some light for deeply understanding the evolution mechanism of the real systems.
