文档介绍：毕业设计(论文)报告
题目: 电网谐波谐振的分析
电气工程院(系) 电气工程及其自动化专业
摘要
在电力系统中存在大量的谐波源,使得电力系统网络中感性元件与容性元件之间可能发生串联谐振或者是并联谐振。谐波谐振通常表现为高电压或者是过电流。这种谐振现象已被发现与网络导纳矩阵的奇异性有关。这种奇异性其实是由于矩阵的一个特征根趋于零造成的。通过分析特征根的性质,可以得到有关谐振机理和程度的信息。本课题就是研究这种谐振现象与系统网络导纳矩阵之间的关系。由于谐波谐振是因系统中感性元件与容性元件之间的能量交换造成的。而系统中存在大量的感性与容性元件,所以谐波谐振现象变得非常复杂。本文使用
“谐振模态分析”的方法,可以“解耦”这种复杂的能量存储元件之间复杂的交互联系,并揭示导致某个谐振问题的真正“根源”,从而帮助人们找到消除谐波谐振的方法。理论分析以及实验研究表明该方法的可行性。
关键词:特征根,谐波,谐波谐振,模态分析,Matlab
ABSTRACT
There are a lot of harmonic sources in power systems. It may cause series resonance and parallel resonance between inductive elements and capacitive elements of the power systems. Harmonic resonance often manifests as high harmonic voltages or over current. It found that such resonance phenomenon is associated with the singularity of work admittance matrix. The singularity in turn is due to the fact that one of eigenvalues of the matrix approaches zero. By analyzing the characteristics of the eigenvalue, one can find useful information on the nature and extent of the resonance. The objective of this paper is to present findings on this subject and to make some researches on the relationship between harmonic resonance phenomenon and work admittance matrix. since a power system contains numerous inductive and capacitive elements, the phenomenon of harmonic resonance can e plicated. We use a modal analysis method to untangle plex interactions among the energy storage elements and reveal the true culprits. It can help one to find solutions to mitigate harmonic resonance problem. Analytical and case study results have confirmed that the proposed method is a valuable tool for power system harmonic analysis.
Key word: Eigenvalue, harmonics, harmonic resonance, modal analysis, Matlab
目录
摘要 I
ABSTRACT II
第一章绪论 - 1 -
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第二章谐振模态分析 - 7 -
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第三章系统元件的谐波模型 - 11 -
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