基于Lambert W函数时滞电力系统低频振荡研究

发布时间：2018-04-24 00:25

本文选题：互联电力系统 + 时滞　；参考：《南京理工大学》2017年硕士论文

【摘要】：伴随我国西电东送、全国联网战略的慢慢实施,互联电力系统的范围渐渐扩大,系统互联激发的低频振荡问题严重威胁着电网的稳定性和传输能力。同时,随着广域测量系统应用到电力系统的稳定控制中,以广域测量信号作为附加阻尼控制器的输入信号已经成为可能,对系统的低频振荡有很好的抑制作用,但是广域信号在传输的过程中会有时滞的产生,时滞的出现会增大控制器的设计难度,所以需要处理好时滞的问题。本文中,采用PSS和SVC联合抑制电力系统低频振荡,分析附加控制的电力系统稳定器(PSS)对区域内低频振荡的原理,针对所设计的控制器整定合适的参数;同时,考虑了时滞影响的静止无功补偿器(SVC)广域附加阻尼控制器的设计,建立时滞电力系统的数学模型,分析选择SVC的附加阻尼控制器的输入信号以及SVC的安装地点,采用Lambert W函数的方法设计控制器的增益K。用MATLAB搭建含有PSS和SVC附加阻尼控制器的双机电力系统的模型并对其进行仿真研究。验证含有PSS和SVC附加阻尼控制器的双机系统在有时滞时对系统稳定性的影响,并模拟单相短路故障与三相短路故障,分析有无PSS和SVC时对电力系统低频振荡的作用。通过对仿真波形的分析,可以判断出PSS和所设计的考虑广域信号时滞影响的SVC附加阻尼控制器联合抑制互联电网低频振荡的有效性。
[Abstract]:Along with the power transmission from west to east and the implementation of national interconnection strategy, the range of interconnected power system is gradually expanding, and the low frequency oscillation caused by system interconnection seriously threatens the stability and transmission ability of power grid. At the same time, with the wide area measurement system applied to the stability control of power system, it is possible to use the wide area measurement signal as the input signal of the additional damping controller, which can restrain the low frequency oscillation of the system. However, in the process of wide-area signal transmission, there will be time delay, which will increase the design difficulty of controller, so it is necessary to deal with the problem of delay. In this paper, PSS and SVC are used to suppress the low frequency oscillation of power system, and the principle of the power system stabilizer with additional control is analyzed. The design of wide-area additional damping controller for static Var compensator (SVC) with time-delay effect is presented. The mathematical model of time-delay power system is established, and the input signal of the additional damping controller of SVC and the installation location of SVC are analyzed. The gain K. of the controller is designed by using Lambert W function. The model of dual machine power system with PSS and SVC additional damping controller is built with MATLAB and its simulation research is carried out. The effects of PSS and SVC additional damping controllers on the stability of power system with time delay are verified, and the single-phase and three-phase short-circuit faults are simulated. The effect of PSS and SVC on the low-frequency oscillation of power system is analyzed. By analyzing the simulation waveform, the effectiveness of PSS and the designed SVC additional damping controller considering the influence of wide area delay on the suppression of low frequency oscillation in interconnected power system can be judged.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM712

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