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本文介绍了如何列出表达式来对系统各种变量的逻辑关系进行分析,以利于更好的进行PLC编程。 相似文献
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多变量系统耦合度分析 总被引:3,自引:0,他引:3
本文分析了多变量系统耦合度分析与变量配对之间的关系,通过仿真实例说明了耦合度分析的重要性。同时从应用的角度分析比较了现有耦合度分析方法,指出了各种方法的优缺点和运用范围。 相似文献
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变量分组策略对于解决电力系统长过程动态仿真的刚性问题发挥了积极作用。但由于参与分组的变量在动态全过程中均需要进行积分运算,制约了计算效率的进一步提高。对此问题,在变量分组的基础上引入变量适时退出策略:当某些变量变化幅度降到设定的阈值以下时,可将它们暂时退出分组和积分运算。此措施既能降低参与分组变量的维数,又能减小仿真过程的运算量,从而提高系统仿真的整体计算效率。算例结果表明,所提方法具有随着系统规模增大、计算效率提高越明显的优良特性。 相似文献
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变量分组策略对于解决电力系统长过程动态仿真的刚性问题发挥了积极作用.但由于参与分组的变量在动态全过程中均需要进行积分运算,制约了计算效率的进一步提高.对此问题,在变量分组的基础上引入变量适时退出策略:当某些变量变化幅度降到设定的阈值以下时,可将它们暂时退出分组和积分运算.此措施既能降低参与分组变量的维数,又能减小仿真过程的运算量,从而提高系统仿真的整体计算效率.算例结果表明,所提方法具有随着系统规模增大、计算效率提高越明显的优良特性. 相似文献
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大学生心理幸福感研究概述 总被引:2,自引:0,他引:2
心理幸福感是基于实现论的幸福感研究范式,研究者认为幸福并不只是情感上的体验,而更应该关注个人潜能的实现,心理幸福感的评价标准从内容上看,比较符合大学生这一群体的心理健康测量。已有的研究表明,人格变量、人口学变量和生活事件等内外因素可以较为有效地预测大学生心理幸福感水平。近年来,对大学生主观幸福感和心理幸福感的研究呈现出整合的趋势。此外,中国大学生的幸福感研究在借鉴西方成果的同时,仍然需要立足于本土文化,做进一步的理论探讨和实证检验。 相似文献
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针对目前日益突出的电能质量问题,开发了通用电气变量监测与分析装置,介绍了其硬件及软件构成,并为减小测量误差进行了相应算法的分析与比较,在此基础上进行了仿真测试,取得了良好的效果。 相似文献
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文章介绍了虚拟仪器技术的特点及其在状态监测系统中的优点,阐述了用LabVIEW开发的水电厂状态监测系统的功能及系统实现的方法,并描述了数据分析的原理。 相似文献
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基于模式搜索算法的电力系统机组组合问题 总被引:6,自引:0,他引:6
机组组合问题是一个复杂的大型混合整数非线性规划问题,目前尚未找到理想的解决方法。本文提出一种用于混合变量的模式搜索方法(GPSMV)解决机组组合问题。该方法能求解非凸、非线性、不可微甚至不连续的规划问题,理论上能保证全局收敛于稳定的解,其仅需要求目标函数及由约束条件构成的障碍函数值而不需要对目标函数和约束条件求导。在优化过程中离散变量作为独立的变量,而不是把原问题分成离散和连续两层来处理,适合于求解离散和连续的混合变量问题。最后对10~100机,26机24时段等六个系统进行仿真试验验证该算法。 相似文献
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建立了无功优化控制数学模型,考虑了工程实际中最优解、次优解以及约束条件松弛等问题,更适合地区电网优化求解. 相似文献
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针对目前时段划分中对动作次数的处理和模型简化方面存在的问题,设计设备状态的关联矩阵,并据此进行时间区间划分。在此基础上,对每个时段进行静态无功优化,保留每个时刻的最优解和部分次优解,并将这些解作为动态规划的状态变量。在各时段中用动态规划法以动作次数最小为目标寻找最优路径,从而得到整个调度周期的动态无功优化问题的解。某实际地区电网算例说明了时段划分和基于此的动态无功优化方法的有效性。 相似文献
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In the present study a comprehensive thermodynamic modeling and multi-objective exergoeconomic optimization of a new integrated SOFC-trigeneration system is carried out to determine the optimum decision parameters, accounting for exergetic, economic and environmental factors. Results of optimal designs are obtained as a set of multiple optimum solutions, called the Pareto optimal solutions. An example of decision-making is presented and a final optimal solution is introduced. Moreover, the optimized results are compared with the working data from a base case design of an actual system. This new approach shows that by selecting final optimum solution, the trigeneration unit cost of products reduced by 13.88% and exergy efficiency increased from 62.85% in the base case to 64.5% in the optimum case. Also, the optimization results demonstrate that fuel cost, exergy destruction cost and environmental impacts (CO2 emissions cost) are reduced by 17.54%, 17.05% and 18.22% respectively; although these are achieved with 8.03% increase in the capital investment cost. Finally, sensitivity analysis is carried out to examine the effect of changes in the Pareto optimal solutions to the system economic parameters. 相似文献
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循环水系统经济运行问题的分析 总被引:3,自引:2,他引:1
运用优化理论对循环水系统的经济运行问题进行分析。建立数学模型,并运用OPB-1优化程序库求解;同时对母管制循环水系统的循环水量的分配和变化规律进行理论研究,得出了有益的结论 相似文献
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A hybrid multi-agent based particle swarm optimization algorithm for economic power dispatch 总被引:1,自引:0,他引:1
Rajesh Kumar Devendra Sharma Abhinav Sadu 《International Journal of Electrical Power & Energy Systems》2011,33(1):115-123
This paper presents a new multi-agent based hybrid particle swarm optimization technique (HMAPSO) applied to the economic power dispatch. The earlier PSO suffers from tuning of variables, randomness and uniqueness of solution. The algorithm integrates the deterministic search, the Multi-agent system (MAS), the particle swarm optimization (PSO) algorithm and the bee decision-making process. Thus making use of deterministic search, multi-agent and bee PSO, the HMAPSO realizes the purpose of optimization. The economic power dispatch problem is a non-linear constrained optimization problem. Classical optimization techniques like direct search and gradient methods fails to give the global optimum solution. Other Evolutionary algorithms provide only a good enough solution. To show the capability, the proposed algorithm is applied to two cases 13 and 40 generators, respectively. The results show that this algorithm is more accurate and robust in finding the global optimum than its counterparts. 相似文献
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Combined heat and power economic dispatch (CHPED) is one of the critical issues in power systems, playing key role in economic performance of the system. CHPED is a challenging optimization problem of non-linear and non-convex type. Thus, evolutionary and heuristic algorithms are employed as effective tools in solving this problem. This paper applies newly proposed exchange market algorithm (EMA) on CHPED problem. EMA is a powerful and robust algorithm. With two powerful absorbing operators pulling solutions toward optimality and two smart searching operators, EMA is able to extract optimum point in optimization problem. In order to examine the proposed algorithm’s capabilities and find optimum solution for CHPED problem, several test systems considering valve-point effect, system power loss and system constraints are optimized. The obtained results prove high capability of EMA in extracting optimum points. The results also show that this algorithm can be utilized as an efficient and reliable tool in solving CHPED problem. 相似文献
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This paper presents a simplified method of deriving Wiener's optimum frequency-response system based on the meansquare-error. The initial step follows closely other authors but the final solution is obtained without resorting to cumbersome algebraic manipulation of "completing the square." Furthermore, the present approach is more rigorous and provides a solution representing a unique minimum for the variables considered. 相似文献