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基于模糊区间算法的多能耦合系统电能流潮流计算
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作者 秦文超 刘旭斐 张斌 《电子器件》 CAS 2024年第5期1344-1349,共6页
传统的电能流潮流计算方法往往无法有效处理多能量源之间的复杂耦合关系。为此,研究基于模糊区间算法的多能耦合系统电能流潮流计算方法。基于电热耦合理论,构建以电力、热力系统以及电联产机组等耦合单元为主的电热耦合系统电能流潮流... 传统的电能流潮流计算方法往往无法有效处理多能量源之间的复杂耦合关系。为此,研究基于模糊区间算法的多能耦合系统电能流潮流计算方法。基于电热耦合理论,构建以电力、热力系统以及电联产机组等耦合单元为主的电热耦合系统电能流潮流模型,合理定义耦合系统各不确定性状态变量区间范围,并利用模糊数理论,梯形模糊化耦合系统各状态变量区间,通过双层抽样法,完成电热耦合系统电能流潮流模型求解工作,获取系统各状态变量模糊区间解。实验结果表明:所提方法可准确获取多能耦合系统各状态变量模糊区间解;当电热负荷扰动较大时,热网管道流量模糊区间上下限波动较为剧烈,会增加热网流量越限的风险。 展开更多
关键词 模糊区间算法 多能耦合系统 电能流 潮流计算 耦合元件 系统状态变量
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燃料电池-蓄电池-超级电容动力系统能量管理策略研究 被引量:1
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作者 李凯 陈佳星 章桐 《内燃机与配件》 2023年第10期9-14,共6页
燃料电池的缺点是功率输出疲软,对动态功率加载不能及时做出迅速反应,因此可以采用组合动力源的方式改善。我们采用蓄电池作为辅助能源来储存制动回收的能量,而且嵌入具有高功率密度特性的超级电容。为分配好上述三电源混合动力系统中... 燃料电池的缺点是功率输出疲软,对动态功率加载不能及时做出迅速反应,因此可以采用组合动力源的方式改善。我们采用蓄电池作为辅助能源来储存制动回收的能量,而且嵌入具有高功率密度特性的超级电容。为分配好上述三电源混合动力系统中的功率流,本文以庞特里亚金极小值原理作为基础,制定分别以蓄电池和超级电容的荷电状态为状态变量;蓄电池和超级电容输出功率为控制变量;氢气消耗量为目标函数的能量管理策略。本文通过比较基于PMP和功率跟随两种能量管理策略,得出前者的更优性。 展开更多
关键词 燃料电池汽车动力系统 极小值原理 功率跟随 能量管理策略 状态变量系统
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多目标突变论在城市空间发展方向决策中的应用 被引量:5
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作者 张鲜化 陈金泉 《南方冶金学院学报》 2005年第3期51-55,共5页
城市空间发展方向的决策是目前赣州市急需解决的问题,采用多目标突变决策理论,结合赣州市的地理位置状况、气候特征等实际情况对其城市空间可能发展的4个方向进行了方案的排序选优,得出了最优方案,提出了当前赣州市合理的空间发展方向.
关键词 城市空间发展 突变模型 系统状态变量X
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An Extended Closed-loop Subspace Identification Method for Error-in-variables Systems 被引量:1
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作者 刘涛 邵诚 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第6期1136-1141,共6页
A closed-loop subspace identification method is proposed for industrial systems subject to noisy input-output observations, known as the error-in-variables (EIV) problem. Using the orthogonal projection approach to el... A closed-loop subspace identification method is proposed for industrial systems subject to noisy input-output observations, known as the error-in-variables (EIV) problem. Using the orthogonal projection approach to eliminate the noise influence, consistent estimation is guaranteed for the deterministic part of such a system. A strict proof is given for analyzing the rank condition for such orthogonal projection, in order to use the principal component analysis (PCA) based singular value decomposition (SVD) to derive the extended observability matrix and lower triangular Toeliptz matrix of the plant state-space model. In the result, the plant state matrices can be retrieved in a transparent manner from the above matrices. An illustrative example is shown to demonstrate the effectiveness and merits of the proposed subspace identification method. 展开更多
关键词 closed-loop error-in-variables system subspace identification extended observability matrix orthogonal projection
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The identification algorithm for commensurate order linear time-invariant fractional systems
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作者 王振滨 曹广益 朱新坚 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2005年第5期576-580,共5页
An efficient identification algorithm is given for commensurate order linear time-invariant fractional systems. This algorithm can identify not only model coefficients of the system, but also its differential order at... An efficient identification algorithm is given for commensurate order linear time-invariant fractional systems. This algorithm can identify not only model coefficients of the system, but also its differential order at the same time. The basic idea is to change the system matrix into a diagonal one through basis transformation. This makes it possible to turn the system’s input-output relationships into the summation of several simple subsystems, and after the identification of these subsystems, the whole identification system is obtained which is algebraically equivalent to the former system. Finally an identification example verifies the effectiveness of the method previously mentioned. 展开更多
关键词 fractional systems COMMENSURATE linear time-invariant state-space representation system identification
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Critical Contingencies Ranking for Dynamic Security Assessment Using Neural Networks
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作者 Gustavo Schweickardt Juan Manuel Gimenez-Alvarez 《Journal of Energy and Power Engineering》 2012年第10期1663-1672,共10页
A number of contingencies simulated during dynamic security assessment do not generate unacceptable values of power system state variables, due to their small influence on system operation. Their exclusion from the se... A number of contingencies simulated during dynamic security assessment do not generate unacceptable values of power system state variables, due to their small influence on system operation. Their exclusion from the set of contingencies to be simulated in the security assessment would achieve a significant reduction in computation time. This paper defines a critical contingencies selection method for on-line dynamic security assessment. The selection method results from an off-line dynamical analysis, which covers typical scenarios and also covers various related aspects like frequency, voltage, and angle analyses among others. Indexes measured over these typical scenarios are used to train neural networks, capable of performing on-line estimation of a critical contingencies list according to the system state. 展开更多
关键词 Critical contingencies dynamic security assessment neural networks.
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