风电集中接入电网的低频振荡与阻尼控制研究

发布时间：2018-01-29 02:24

本文关键词： 风电集中接入低频振荡阻尼控制在线安全分析电力系统　出处：《华北电力大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来,随着大规模风电接入电网,以及大区电网互联规模的急剧扩大,低频振荡发生的概率也随之加大。因此,研究提出一种风电集中接入电网的低频振荡辨识方法与阻尼控制策略,辅助调度人员及时发现电力系统中的低频振荡模式,提升电力系统的阻尼比,降低电力系统发生低频振荡的风险,对当前大电网的发展有着重要的意义。本文研究提出了一种风电集中接入电网的低频振荡辨识方法与阻尼控制策略,并针对甘肃电网的实际情况进行了实例验证。首先分析了风电集中接入电网对电力系统阻尼的影响,建立了风电集中接入电网的电力系统数学模型；其次利用逆迭代转Rayleigh商迭代法计算得到电力系统状态矩阵的特征值与特征向量；再次按照机电回路相关比、频率、低频振荡辨识指标、以及机组相位分群判定对特征值进行筛选；最后确定风电接入电网的低频振荡模式。基于风电集中接入电网的低频振荡辨识方法,研究提出了一种考虑风电集中接入的低频振荡阻尼控制策略。首先分析发电机出力对系统阻尼的影响作为阻尼控制的理论依据；然后以阻尼比对机组出力灵敏度为量化指标,通过采用反向等量配对法,提出了风电集中接入电网的阻尼控制策略。以甘肃电网为研究背景,基于甘肃电网EMS实时数据,经过实时数据预处理、内外网数据实时匹配等方法,建立了甘肃电网低频振荡实时辨识计算模型。在此基础上,对风电集中接入电网的低频振荡辨识方法与阻尼控制策略进行了仿真验证,仿真结果表明了论文所提出的低频振荡辨识方法与阻尼控制策略的可行性和有效性。
[Abstract]:In recent years, with the large-scale wind power connected to the grid, and the rapid expansion of the scale of power grid interconnection, the probability of low-frequency oscillation also increases. In this paper, a low frequency oscillation identification method and damping control strategy for centralized wind power system are proposed to assist dispatchers to find out the low frequency oscillation mode in power system in time, and to improve the damping ratio of power system. Reducing the risk of low frequency oscillation in power system is of great significance to the development of large power grid. In this paper, a low frequency oscillation identification method and damping control strategy for centralized wind power grid connection are proposed, and an example is given to verify the actual situation of Gansu power network. Firstly, the influence of centralized wind power grid on the damping of power system is analyzed, and the mathematical model of power system is established. Secondly, the eigenvalues and Eigenvectors of the power system state matrix are obtained by inverse iteration and Rayleigh quotient iterative method. Thirdly, the eigenvalues are screened according to the electromechanical circuit correlation ratio, frequency, low frequency oscillation identification index and unit phase cluster decision. Finally, the low frequency oscillation mode of wind power connected to power grid is determined. A low frequency oscillation identification method based on centralized wind power grid connection. In this paper, a low frequency oscillation damping control strategy considering centralized wind power access is proposed. Firstly, the influence of generator output on system damping is analyzed as the theoretical basis for damping control. Then the damping control strategy of wind power centralized access to the power network is proposed by using the inverse isometric pairing method with the damping ratio as the quantitative index. Taking Gansu power grid as the research background, based on the EMS real-time data of Gansu power network, the methods of real-time data pre-processing and real-time data matching between internal and external networks are presented. The real-time identification model of low frequency oscillation in Gansu power network is established. Based on this, the identification method of low frequency oscillation and damping control strategy of centralized wind power network are simulated and verified. The simulation results show the feasibility and effectiveness of the low frequency oscillation identification method and damping control strategy proposed in this paper.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614

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