共查询到19条相似文献,搜索用时 640 毫秒
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势能界面法(PEBS)暂态稳定分析的综述及展望 总被引:5,自引:2,他引:3
概述了采用势能界面法(PEBS)进行暂态稳定分析研究的发展史,该法速度快,可以引入任何复杂模型,没有收敛性问题,但在多机失稳模式下精度较差,指出将几种直接法与时域仿真法相结合,可能是当前实现动态安全分析的发展趋势。 相似文献
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电力系统中电压与无功问题的新特点及对策 总被引:1,自引:0,他引:1
对电力系统当前的电压与无功功率现状作了阐述,提出了当前系统中无功问题的三个新特点。用三相电动机起动过程的仿真示例,说明系统的无功功率不足可引起电压下降现象。并对电压稳定问题和无功补偿问题作了简要的分析,分别就防止电压崩溃和采用动态补偿设备问题提出了相应的对策。 相似文献
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随着电力市场进程的加快,系统运行不断逼近极限,电压稳定已成为影响系统安全的焦点问题,而合理的无功规划对保持系统电压稳定具有重要意义。首先解释了考虑电压稳定约束的无功规划基本概念,接着对目前基于静态和动态电压稳定约束的无功规划模型和求解方法进行总结与评述,提出了该领域需要深入研究的五个关键问题,强调了考虑安全性和经济性的无功规划是当前该领域的发展趋势,最后指出了建立基于动态电压稳定裕度的无功规划模型是避免系统电压崩溃的关键。 相似文献
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随着电力市场进程的加快,系统运行不断逼近极限,电压稳定已成为影响系统安全的焦点问题,而合理的无功规划对保持系统电压稳定具有重要意义.首先解释了考虑电压稳定约束的无功规划基本概念,接着对目前基于静态和动态电压稳定约束的无功规划模型和求解方法进行总结与评述,提出了该领域需要深入研究的五个关键问题,强调了考虑安全性和经济性的无功规划是当前该领域的发展趋势,最后指出了建立基于动态电压稳定裕度的无功规划模型是避免系统电压崩溃的关键. 相似文献
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概述了采用势能界面法(PEBS)进行暂态稳定分析研究的发展史,该法速度快,可以引入任何复杂模型,没有 收敛性问题,但在多机失稳模式下精度较差。指出将几种直接法与时域仿真法相结合,可能是当前实现动态 安全分析的发展趋势。 相似文献
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电力系统安全稳定控制的分析与展望 总被引:1,自引:0,他引:1
电力系统在大扰动下一旦失去稳定,往往造成大范围、较长时间停电,重则可能使电力系统崩溃和瓦解.因此,研究和实施相应的安全稳定控制措施,不但可以提高系统运行的可靠性,而且可以因传输能力的提高而产生直接经济效益.本文分析了当前电力系统安全稳定控制的类型和措施,介绍了国内外安全稳定控制的现状及相关技术的发展,对电力系统安全稳定控制的发展作出几点展望. 相似文献
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应用基于系统辨识的快速暂稳预测方法 ,超前判别系统的稳定性及稳定裕度 ,在充分保证判断准确性的情况下 ,对某些可以确认为稳定的故障 ,超前中止仿真计算 ,从而大大节省在线动态安全分析的宝贵时间 ,以实现在线准实时稳定控制 相似文献
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Fast contingency screening is expected to be an integral part of any practical online dynamic security analysis (DSA). Ranking of contingencies requires the use of severity indices, and for DSA such an index must be a measure of stability. From experience in static security analysis, it is well known that some indices work better than others for particular power systems and that combinations of indices usually work better than a single index. For DSA, which is still in its infancy, severity indices are more complex and very few have been tested for screening. In this paper, several indices are proposed for contingency screening in online DSA. These indices are based on the concepts of coherency, transient energy conversion between kinetic energy and potential energy and three dot products of system variables. Test results on realistic power systems show the promise of these indices in contingency screening 相似文献
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6 00 MW电站锅炉过热器减温水治理策略及效果 总被引:3,自引:0,他引:3
大唐国际托克托发电有限责任公司三、四期4×600 MW机组自投运以来,锅炉过热器减温水量大大超出设计值,满负荷时达到330~350 t/h,远超过77.8 t/h(100%THA)的设计值。虽经燃烧器改造、燃烧调整诸措施均不能有效降低减温水量,这直接影响到机组的安全及经济运行。通过数值模拟和热力计算分析,提出了燃烧器调整和尾部受热面改造以降低过热器减温水量的治理方案,首先在5号炉上实施了尾部受热面改造。改造后的锅炉效率测试表明,在不同负荷下过热器减温水量和排烟温度明显降低,锅炉效率明显提高,综合发电煤耗下降约3 g/kW h。 相似文献
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In this paper, a simple and efficient nature inspired search method based on differential search algorithm (DSA) has been presented and used for optimal power flow (OPF) problem in power systems. By using the proposed DSA method, the power system parameters such as real power generations, bus voltages, load tap changer ratios and shunt capacitance values are optimized for the certain objective functions. Different types of single-objective and multi-objective functions on IEEE 9-bus, IEEE 30-bus and IEEE 57-bus power systems are used to test and verify the efficiency of the proposed DSA method. By comparing with several optimization methods, the results obtained by using the proposed DSA method are presented in detail. The results achieved in this work illustrate that the DSA method can successfully be used to solve the non-linear and non-convex problems related to power systems. 相似文献
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本文采用小干扰分析方法详细分析了电力系统中各元件动态对静态电压稳定性的影响,并给出了简单的物理解释,对静态电压稳定研究中所应采用的系统模型提出了自己的看法。采用的小干扰分析程序对目前普遍认为与电压崩溃现象密切相关的系统动态进行了详细的模拟。 相似文献
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This paper proposes a new multi-level methodology based on the optimal reactive power planning. The developed methodology is designed to solve the problem of the non-feasibility solution of the fuel cost minimization problem (for a given operating point) where the classical method such as interior point method (IPM) is applied. The proposed solution to solve this problem is based on the application of the optimal reactive power planning problem considering voltage stability as the initial solution of the fuel cost minimization problem. To improve the latter the load voltage deviation problem is applied to improve the system voltage profile. For à good result improvement, the reactive power planning problem and the load voltage deviation minimization problems are solved using a new optimization method namely the Differential Search Algorithm (DSA). Moreover, the fuel cost minimization problem is solved using IPM. To identify the candidate placements of compensation devices for the optimal reactive power planning problem, a new voltage stability index namely: The Fast Voltage Stability Index (FVSI) is used. The methodology has been tested with the equivalent Algerian power system network, and the simulation results show the effectiveness of the proposed approach to improve the reactive power planning problem and to minimize the system voltage deviation. 相似文献