Dynamic Analysis of Harmonics in Electrical Systems
Dynamic Analysis of Harmonics in Electrical Systems
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发表时间：
2000
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通讯作者：
Erik Möllerstedt
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作者：
Erik Möllerstedt
电力系统的频域分析和设计在谐波、开关动态、非线性、不平衡和具有混合AC/DC动态的系统中是复杂的。其原因在于，系统的线性化不会导致时不变系统，而是具有周期性时变动态的系统，这意味着不同频率之间存在耦合。人们常常不得不依赖于简化的假设和模拟。本文采用线性时间周期（LTP）模型分析电力系统.介绍了LTP系统的谐波传递函数。使用HTF，该系统可以被视为一个无限维的线性时不变系统，这意味着该系统，在一定的收敛条件下，可以使用成熟的LTI系统的理论进行分析。本论文包括四篇电力系统应用论文。论文我介绍了网络的建模和分析，包括与开关动态，如二极管和晶闸管组件。提出了一种从实验数据中估计参数的算法。论文二和三处理建模和单相铁路系统的分析。机车的建模是与工业合作进行的。论文四处理的分析和控制方面的转换器用于分布式发电的微型涡轮机的电网连接。这是一个与业界合作完成的三阶段应用程序。（减）
Frequency domain analysis and design of power systems is complicated in the presence of harmonics, switching dynamics, nonlinearities, unbalances, and for systems with mixed ac/dc dynamics. The reason is that linearization of the system does not lead to a time invariant system, but a system with periodically time varying dynamics, which implies that there is coupling between different frequencies. Often one has to rely on simplifying assumptions and simulation. The thesis uses linear time periodic (LTP) models to analyze power systems. The harmonic transfer function (HTF) for LTP systems is introduced. Using the HTF, the system can be treated as an infinitely dimensional linear time invariant system, which means that the system, under certain convergence conditions, can be analyzed using the well developed theory for LTI systems. The thesis contains four papers with power system applications. Paper I describes the modeling and analysis of networks including components with switching dynamics, such as diodes and thyristors. An algorithm for parameter estimation from experimental data is presented. Papers II and III treats modeling and analysis of single-phase railway systems. The modeling of the locomotives is performed in collaboration with industry. Paper IV treats analysis and control aspects of a converter for grid connection of a micro-turbine used for distributed power generation. This is a three-phase application done in collaboration with the industry. (Less)