互联双机电力系统的混沌振荡分析及其抑制方法研究

发布时间：2018-12-25 12:39

【摘要】：混沌振荡是非线性系统中各参数相互作用导致的一种非常复杂的现象,电力系统是一个典型的非线性系统,在周期性扰动的负荷下或当系统参数满足一定条件时会产生混沌振荡,这种持续无规则的振荡可能导致系统失稳,严重危害系统的安全运行。因此,分析电力系统混沌振荡的机理特性和抑制策略具有重要的基础意义与应用价值。首先,本文分析总结了互联双机电力系统产生混沌振荡的机理特征和参数条件;其次,对该混沌系统设计了包含双曲切换项的双曲滑模控制器,并从理论上分析和证明了该控制器的稳定性和收敛精度;第三,基于分数阶控制理论,设计了分数阶双曲滑模控制器,并进行了该控制器理论稳定性的验证;最后,对于产生混沌振荡的互联双机电力系统,进行了两种控制器分别作用下的仿真实验。仿真结果表明,和传统滑模控制中不连续的切换项相比,双曲滑模控制器中连续光滑的双曲切换项可以柔化滑模控制器的输出,并改善传统滑模变结构控制中的“抖振”现象,而通过分数阶滑模面和分数阶双曲切换项的设计,可进一步提高控制器输出的平稳性并加快系统向滑模面的趋近速度。
[Abstract]:Chaotic oscillation is a very complex phenomenon caused by the interaction of various parameters in nonlinear system. Power system is a typical nonlinear system. Chaotic oscillations will occur under the load of periodic disturbances or when the system parameters meet certain conditions. This kind of continuous and irregular oscillation may lead to the instability of the system and seriously endanger the safe operation of the system. Therefore, it is of fundamental significance and application value to analyze the mechanism and suppression strategy of chaotic oscillation in power system. Firstly, the mechanism characteristics and parameter conditions of chaotic oscillation in interconnected two-machine power system are analyzed and summarized in this paper. Secondly, the hyperbolic sliding mode controller with hyperbolic switching term is designed for the chaotic system, and the stability and convergence accuracy of the controller are analyzed and proved theoretically. Thirdly, based on the fractional order control theory, a fractional hyperbolic sliding mode controller is designed, and the theoretical stability of the controller is verified. Finally, the simulation experiments of interconnected two-machine power system with chaotic oscillation are carried out under the action of two kinds of controllers. The simulation results show that compared with the discontinuous switching term in the traditional sliding mode control, the continuous smooth hyperbolic switching term in the hyperbolic sliding mode controller can soften the output of the sliding mode controller and improve the "buffeting" phenomenon in the traditional sliding mode variable structure control. Through the design of fractional sliding mode surface and fractional hyperbolic switching term, the output stability of controller can be further improved and the system approach to sliding mode surface can be accelerated.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM712

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