含DFIG风电场的电力系统小干扰随机稳定分析

发布时间：2018-07-06 15:01

本文选题：双馈风机 + 小干扰稳定　；参考：《华北电力大学(北京)》2016年硕士论文

【摘要】：风电机组具有有别于传统同步机的动力学特性,加之风功率的随机波动性,大容量风电汇集接入电网使得电力系统趋向于一个随机-确定性耦合的系统。这给电力系统稳定,特别是给小干扰稳定及其分析带来了诸多新问题。传统确定性的分析方法已不能准确、全面的研究含大规模风电场的电力系统小干扰稳定问题。针对上述问题,本文以双馈风机(doubly fed induction generator, DFIG)构成的风电场为研究对象,分别采用随机微分方程(Stochastic Differential Equations, SDE)和概率分析的方法分析含DFIG风电场的电力系统小干扰稳定问题。首先,借助随机微分方程研究特定运行点发生小扰动后系统恢复过程中的动态行为特性。建立了含DFIG的电力系统随机动态模型,然后采用所建模型分析了单风机和含风机的多机系统小干扰随机稳定,利用波动方差指标来刻画随机激励对系统小干扰动态响应的影响。然后,借助概率分析的方法研究接入大规模风电的实际大型电力系统随机运行点下的小干扰稳定特性。针对传统概率方法难以分析风电接入的实际系统小干扰稳定的问题,提出了一种蒙特卡罗(Monte Carlo)结合BPA的风电接入实际电力系统小干扰稳定概率分析方法,从而将概率分析应用到了实际大型电力系统的小干扰稳定分析中。并用该方法对风电接入的3机9节点系统和某省实际电力系统的小干扰稳定做了概率分析。整个研究提出了一套适合含风电的电力系统小干扰随机稳定分析方法,研究成果对研究随机-确定性耦合电力系统的稳定问题具有参考价值。
[Abstract]:The dynamic characteristics of wind turbine are different from those of traditional synchronous generator, and the random fluctuation of wind power makes the power system tend to a stochastic and deterministic coupling system. This brings many new problems to power system stability, especially to small disturbance stability and its analysis. The traditional deterministic analysis method is not accurate. The small disturbance stability problem of power system with large scale wind farm is studied comprehensively. To solve the above problems, the wind farm composed of doubly-fed fan (doubly fed induction generator, DFIG) is studied in this paper. Stochastic differential equations (SDE) and probabilistic analysis are used to analyze the small disturbance stability problem of power system with DFIG wind farm. Firstly, the dynamic behavior of the system during the recovery process is studied by means of stochastic differential equations. The stochastic dynamic model of power system with DFIG is established, and the small disturbance stochastic stability of single fan and multi-machine system with fan is analyzed by using the model, and the influence of random excitation on dynamic response of small disturbance is described by using fluctuation variance index. Then, the stability characteristics of small disturbance in large scale wind power system are studied by means of probabilistic analysis. Aiming at the problem that the traditional probability method is difficult to analyze the small disturbance stability of the actual power system in wind power access, a Monte Carlo method combined with BPA is proposed to analyze the small interference stability probability of the wind power system. The probabilistic analysis is applied to the small disturbance stability analysis of large power system. The probabilistic analysis of the small disturbance stability of the 3-machine 9-node system connected by wind power and the actual power system of a province is made by using this method. A set of small disturbance stochastic stability analysis method for power system with wind power is proposed in this paper. The research results have reference value for studying the stability problem of stochastic and deterministic coupled power system.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM614

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