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Nonlinear modal analysis of interaction between torsional modes and SVC controllers

机译：扭转模式与SVC控制器之间相互作用的非线性模态分析

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This paper deals with the use of Modal Series (MS) method to study the nonlinear interaction between the torsional modes of a turbine-generator set and Static VAr Compensator (SVC) in the stressed power systems. The observations resulting from nonlinear simulations made incentive for suggesting the need for nonlinear analysis of torsional interaction phenomenon in stressed conditions. The obtained results from linear modal analysis were not consistent with those of nonlinear simulations and could not quantify the problem. While the results of nonlinear analysis MS method reveal that, the nonlinear interactions exist between shaft sections and SVC controllers. In the stressed conditions, these nonlinear interactions become more pronounced and it may be a warning for severe damage of shaft segments. By using the indices correspond to the MS method, the nonlinear interactions of torsional modes are evaluated for different conditions. To demonstrate the physical effects of nonlinear interaction of torsional modes with SVC controllers, the torsional torques imposed on shaft sections are provided using the nonlinear simulations. Finally, based on MS method a supplementary controller is designed for SVC to remedy the problem. The proposed approach is implemented on the IEEE 4-machine 11 -bus test system.
机译：本文研究了模态级数法（MS）的研究方法，以研究压力机系统中汽轮发电机组的扭转模式与静态无功补偿器（SVC）之间的非线性相互作用。非线性模拟产生的观察结果促使人们提出了在应力条件下需要对扭转相互作用现象进行非线性分析的必要性。从线性模态分析获得的结果与非线性模拟的结果不一致，并且无法量化问题。非线性分析的MS方法的结果表明，轴部分和SVC控制器之间存在非线性相互作用。在压力条件下，这些非线性相互作用会变得更加明显，这可能是轴段严重损坏的警告。通过使用与MS方法相对应的指标，可以针对不同条件评估扭转模式的非线性相互作用。为了演示与SVC控制器进行的扭转模式非线性相互作用的物理影响，使用非线性仿真提供了施加在轴截面上的扭转扭矩。最后，基于MS方法，为SVC设计了一个辅助控制器来解决该问题。所提出的方法在IEEE 4机11总线测试系统上实现。

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