风电并网对电力系统电压稳定性的影响研究

发布时间：2018-06-05 15:37

本文选题：风电 + 电力系统　；参考：《华北电力大学》2014年硕士论文

【摘要】：随着环境污染问题的日益严重及传统化石能源的逐渐枯竭,以风电为代表的新能源并网技术在世界各国迅速发展。随着风电渗透率的逐渐增大,风电出力对电网的影响范围也相应增大。在风电渗透率较大的电网中,风电的并网改变了系统的潮流分布,影响传输线路上的功率,同时风电的特性使得电力系统的电压稳定性发生了变化。本文主要研究大容量风电接入对电网电压稳定性的影响。首先分析双馈式风力发电系统的数学模型,包括风速模型、风机模型、传动系统模型、风力发电机模型以及变流器及其控制系统模型,并基于矢量控制技术建立了转子侧变流器控制系统和网侧变流器控制系统。然后分析了含风电的电力系统静态电压稳定性机理,并采用电压-无功灵敏度指标分析风电接入后电力系统的静态电压稳定性。利用灵敏度分析指标,针对含风电的强、弱电力系统,分析不同运行方式下,不同风电渗透率对系统静态电压稳定性的影响。最后,推导分析了风电并网后系统暂态电压的表达式,并以含风电场的小系统为例,仿真分析了不同风电渗透率、故障位置等对系统暂态电压的影响,并给出了相应结论。
[Abstract]:With the increasingly serious environmental pollution problems and the gradual exhaustion of traditional fossil energy, the new energy grid technology, represented by wind power, has developed rapidly in all countries all over the world. With the gradual increase of wind power permeability, the influence range of wind power on the power grid is also increased. The distribution of power flow affects the power of transmission lines, and the characteristics of wind power make the voltage stability of power system change.
This paper mainly studies the influence of large capacity wind power access on the voltage stability of the power grid. Firstly, the mathematical model of the doubly fed wind power generation system is analyzed, including wind speed model, fan model, transmission system model, wind generator model, converter and its control system model, and the rotor side converter control is established based on vector control technology. The static voltage stability mechanism of the power system with wind power is analyzed, and the static voltage stability of the power system is analyzed with the voltage and reactive power sensitivity index. The sensitivity analysis index is used to analyze the strong and weak power system with wind power. The influence of the permeability of the same wind on the static voltage stability of the system. Finally, the expression of the transient voltage of the system after the wind power grid connected to the grid is derived, and the influence of the different wind power permeability and the fault position on the transient voltage of the system is simulated and analyzed with the small system containing the wind farm, and the corresponding conclusions are given.
【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;TM712

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