To investigate the interaction between the tropical Pacific and China seas a variable-grid global ocean circulation model with fine grid covering the area from 20°S to 50°N and from 99° to 150°E is...To investigate the interaction between the tropical Pacific and China seas a variable-grid global ocean circulation model with fine grid covering the area from 20°S to 50°N and from 99° to 150°E is developed. Numerical computation of the annually cyclic circulation fields is performed. The results of the annual mean zonal currents and deep to abyssal western boundary currents in the equatorial Pacific Ocean are reported. The North Equatorial Current,the North Equatorial Countercurrent, the South Equatorial Current and the Equatorial Undercurrent are fairly well simulated. The model well reproduces the northward flowing abyssal western boundary current.From the model results a lower deep western boundary current east of the Bismarck-Solomon-New Hebrides Island chain at depths around 2 000 m has been found. The model results also show that the currents in the equatorial Pacific Ocean have multi-layer structures both in zonal currents and western boundary currents, indicating that the global ocean overturning thermohaline circulation appears of multi-layer pattern.展开更多
统一潮流控制器(unified power flow controller,UPFC)在电网正常运行状态以及发生N-1故障时,其控制目标值的设定原则是工程实际的难点之一。以南京西环网UPFC示范工程为例,提出了一种具有线路功率越限控制功能的UPFC系统级控制策略。...统一潮流控制器(unified power flow controller,UPFC)在电网正常运行状态以及发生N-1故障时,其控制目标值的设定原则是工程实际的难点之一。以南京西环网UPFC示范工程为例,提出了一种具有线路功率越限控制功能的UPFC系统级控制策略。所制定的系统级控制策略在电网正常运行状态下,优先保证潮流控制目标;在系统发生N-1故障或因工况改变导致线路过载时,优先保证线路不超过其功率限值。在PSS/E中基于南京西环网的典型数据,对所提出的系统级控制策略进行了验证。仿真结果显示,所提出的UPFC系统级控制策略在系统正常运行以及系统发生N-1故障时,均能达到预期的控制效果,能够保证在示范工程投运后,南京西环网的安全稳定运行。展开更多
为了解决近期及未来南京主城区220 k V西环网存在输电通道瓶颈的问题,电力规划部门决定采取在电网中串接统一潮流控制器(UPFC)的措施。文中结合当地电网实际情况提出了UPFC容量选择的方法和思路。借助电力系统综合分析程序(PSASP),通过...为了解决近期及未来南京主城区220 k V西环网存在输电通道瓶颈的问题,电力规划部门决定采取在电网中串接统一潮流控制器(UPFC)的措施。文中结合当地电网实际情况提出了UPFC容量选择的方法和思路。借助电力系统综合分析程序(PSASP),通过潮流稳态计算,进行了UPFC容量对提升南京西环网供电能力的敏感性分析,并且提出了UPFC最优容量选择。展开更多
为量化评估统一潮流控制器(unified power flow controller,UPFC)装置对电网运行可靠性的影响,以200 k V南京西环网UPFC工程为研究对象,分析了含UPFC系统可靠性评估的方法和流程。首先基于UPFC子系统划分,建立了UPFC各子系统无备用元件...为量化评估统一潮流控制器(unified power flow controller,UPFC)装置对电网运行可靠性的影响,以200 k V南京西环网UPFC工程为研究对象,分析了含UPFC系统可靠性评估的方法和流程。首先基于UPFC子系统划分,建立了UPFC各子系统无备用元件和有备用元件情况下的可靠性模型,在此基础上获得UPFC系统两状态模型,由此提高了传统电力系统可靠性评估方法在含UPFC系统的适用性。最后,结合南京西环网实例,重点分析了装设UPFC、新建线路、采用倍容导线等不同方案以及UPFC不同安装位置对电网可靠性的影响,分析结果可为后续柔性输电装置在江苏应用提供借鉴。展开更多
基金This study is supported by the National Natural Sci-ence Foundation of China under contract No.40136010the Major State Basic Research Program of China under contract No.G1999043808the Youth Fund of National“863”Project of China under contract No.2002AA639350.
文摘To investigate the interaction between the tropical Pacific and China seas a variable-grid global ocean circulation model with fine grid covering the area from 20°S to 50°N and from 99° to 150°E is developed. Numerical computation of the annually cyclic circulation fields is performed. The results of the annual mean zonal currents and deep to abyssal western boundary currents in the equatorial Pacific Ocean are reported. The North Equatorial Current,the North Equatorial Countercurrent, the South Equatorial Current and the Equatorial Undercurrent are fairly well simulated. The model well reproduces the northward flowing abyssal western boundary current.From the model results a lower deep western boundary current east of the Bismarck-Solomon-New Hebrides Island chain at depths around 2 000 m has been found. The model results also show that the currents in the equatorial Pacific Ocean have multi-layer structures both in zonal currents and western boundary currents, indicating that the global ocean overturning thermohaline circulation appears of multi-layer pattern.
文摘统一潮流控制器(unified power flow controller,UPFC)在电网正常运行状态以及发生N-1故障时,其控制目标值的设定原则是工程实际的难点之一。以南京西环网UPFC示范工程为例,提出了一种具有线路功率越限控制功能的UPFC系统级控制策略。所制定的系统级控制策略在电网正常运行状态下,优先保证潮流控制目标;在系统发生N-1故障或因工况改变导致线路过载时,优先保证线路不超过其功率限值。在PSS/E中基于南京西环网的典型数据,对所提出的系统级控制策略进行了验证。仿真结果显示,所提出的UPFC系统级控制策略在系统正常运行以及系统发生N-1故障时,均能达到预期的控制效果,能够保证在示范工程投运后,南京西环网的安全稳定运行。
文摘为了解决近期及未来南京主城区220 k V西环网存在输电通道瓶颈的问题,电力规划部门决定采取在电网中串接统一潮流控制器(UPFC)的措施。文中结合当地电网实际情况提出了UPFC容量选择的方法和思路。借助电力系统综合分析程序(PSASP),通过潮流稳态计算,进行了UPFC容量对提升南京西环网供电能力的敏感性分析,并且提出了UPFC最优容量选择。
文摘为量化评估统一潮流控制器(unified power flow controller,UPFC)装置对电网运行可靠性的影响,以200 k V南京西环网UPFC工程为研究对象,分析了含UPFC系统可靠性评估的方法和流程。首先基于UPFC子系统划分,建立了UPFC各子系统无备用元件和有备用元件情况下的可靠性模型,在此基础上获得UPFC系统两状态模型,由此提高了传统电力系统可靠性评估方法在含UPFC系统的适用性。最后,结合南京西环网实例,重点分析了装设UPFC、新建线路、采用倍容导线等不同方案以及UPFC不同安装位置对电网可靠性的影响,分析结果可为后续柔性输电装置在江苏应用提供借鉴。
