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Harmonics and instabilities in thyristor-based switching circuits.

机译：基于晶闸管的开关电路中的谐波和不稳定性。

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摘要

This thesis investigates nonlinear dynamics, harmonic distortions and bifurcation instabilities in thyristor switching circuits. The analysis is directed towards the study of a Thyristor Controlled Reactor (TCR) which consists of a fixed reactor and two oppositely poled thyristors. The dependence of the thyristor switching times on the system states causes the circuit nonlinearities and is the focus of much of the thesis. New concepts for instability, dynamic response and damping for TCR circuits are introduced. These concepts are general and can be extended to other switching circuits. Useful TCR circuit examples such as the 230 kV Kayenta advanced series compensator and the 230 kV Rimouski static Var system are used to numerically verify these concepts. We have found new instabilities in both the Kayenta and the Rimouski systems in which switching times change suddenly, or bifurcate as a system parameter varies slowly. Switching time bifurcations are associated with large distortions of the TCR current or voltage waveforms leading to a new earlier TCR current zero, the disappearance of a current zero, or a thyristor misfire. The instabilities are explained and their mechanisms are illustrated by analysis, simulation and experiment. The TCR is a periodically operated, nonlinear circuit which may be studied by sampling the system states once per period and by means of the Poincare mapping from the dynamical systems theory. We compute the Jacobian of the Poincare map to understand switching time and conventional bifurcations and also to study the small signal dynamic response of TCR switching circuits. The computation includes the effects of synchronization and the nonlinearity due to thyristor switching. Eigenvalues of the small signal dynamics response are computed and used to study the dynamic response of the Kayenta system using different methods of synchronization. In addition, the Jacobian formulas show how and why a TCR circuit can damp small perturbations even when the circuit resistances are ignored and the thyristors are assumed ideal.
机译：本文研究了晶闸管开关电路中的非线性动力学，谐波畸变和分叉不稳定性。该分析针对的是晶闸管控制电抗器（TCR）的研究，该电抗器由一个固定电抗器和两个相反极性的晶闸管组成。晶闸管切换时间对系统状态的依赖性导致电路非线性，并且是本文的重点。引入了有关TCR电路的不稳定性，动态响应和阻尼的新概念。这些概念是通用的，可以扩展到其他开关电路。有用的TCR电路示例（例如230 kV Kayenta高级串联补偿器和230 kV Rimouski静态无功系统）在数值上验证了这些概念。我们发现在Kayenta和Rimouski系统中都出现了新的不稳定性，其中切换时间突然改变，或者随着系统参数的变化而分叉。开关时间分叉与TCR电流或电压波形的大失真有关，导致新的更早的TCR电流零，电流零消失或晶闸管失火。通过分析，仿真和实验对不稳定性进行了解释，并阐明了其机理。 TCR是一个周期性运行的非线性电路，可以通过对每个周期的系统状态进行一次采样并借助动力系统理论中的庞加莱映射来进行研究。我们计算庞加莱图的雅可比行列式以了解开关时间和常规分叉，并研究TCR开关电路的小信号动态响应。该计算包括同步效应和晶闸管切换引起的非线性。计算小信号动态响应的特征值，并使用不同的同步方法将其用于研究Kayenta系统的动态响应。此外，雅可比公式显示了即使在忽略电路电阻且晶闸管被认为是理想的情况下，TCR电路也能够以及为什么能够抑制小的扰动。

著录项

  • 作者

    Jalali, Sasan Ghombavani.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1993
  • 页码 151 p.
  • 总页数 151
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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