双馈风力发电机降阶模型研究

发布时间：2018-04-02 22:37

本文选题：双馈风电机组　切入点：降阶　出处：《华北电力大学》2014年硕士论文

【摘要】：随着电网对风电并网运行能力的要求不断提高,风电并网系统的控制优化、风电并网送出、风电对电力系统的影响成为当前的研究热点,开发适合系统分析用风电机组模型是开展这些研究的关键技术内容和重要的实现条件。本文从双馈风电机组原理及建模、模型降阶方法、模型对比分析以及基于简化模型的风电场动态等值几个方面开展研究。在建立双馈风电机组各部分的数学模型并详细分析机组控制技术原理的基础上,系统地论述了双馈风电机组的降阶方法,详细分析了由电磁全阶模型到电磁简化模型最后到机电暂态模型的衍变过程：简化机侧和网侧变流器模型,将变流器用可控电压源代替,模拟变流器提供的励磁电压以及网侧变流器调制电压,从而得到双馈风电机组电磁简化模型；进一步把发电机简化也考虑在内,将发电机-变流器模型整体用可控电流源代替,关注风力机的外特性,模拟机组向系统输送的功率,得到双馈风电机组机电暂态模型。对电磁简化模型以及机电暂态模型与全阶模型进行了性能比较,包括模型的主要结构差异与参数对应关系、电网电压正常风速发生阶跃工况与恒定风速电网电压发生跌落两种工况下的运行特性以及计算速度三个方面,并对造成其差异的原因进行了详细的分析。介绍了基于一种简化模型的风电场动态等值的主要步骤,包括机群划分、等值发电机与风力机的参数等值以及控制系统参数等值：并以11台风电机组并网构成的风电场为例,通过对比详细模型与等值模型的仿真结果,验证了提出的风电场动态等值方法的有效性。
[Abstract]:With the increasing demand of wind power grid operation ability, the control optimization of wind power grid connection system, wind power grid transmission, wind power impact on the power system has become the focus of current research.The development of wind turbine model suitable for system analysis is the key technical content and important condition to carry out these researches.In this paper, the principle and modeling of doubly-fed wind turbine, the method of model reduction, the comparative analysis of model and the dynamic equivalence of wind farm based on simplified model are studied.Based on the establishment of mathematical model of each part of doubly-fed wind turbine and the detailed analysis of the principle of unit control technology, the method of reducing the order of doubly-fed wind turbine is discussed systematically.The evolution process from electromagnetic full-order model to electromagnetic simplified model and finally to electromechanical transient model is analyzed in detail. The converter is replaced by a controllable voltage source by simplifying the converter model on the machine side and the grid-side converter.The excitation voltage provided by the converter and the modulation voltage of the grid-side converter are simulated to obtain a simplified electromagnetic model for the doubly-fed wind turbine, and further simplification of the generator is also taken into account, and the whole model is replaced by a controllable current source.Focusing on the external characteristics of the wind turbine, the electromechanical transient model of the doubly-fed wind turbine is obtained by simulating the power transmission from the unit to the system.The performance of the simplified electromagnetic model, the electromechanical transient model and the full-order model are compared, including the main structural differences of the model and the corresponding relationship between the parameters.In this paper, the operating characteristics and calculating speed of normal wind speed step condition and constant wind speed voltage drop condition are discussed in detail, and the causes of the difference are analyzed in detail.This paper introduces the main steps of wind farm dynamic equivalence based on a simplified model, including cluster partition, parameter equivalence between equivalent generators and wind turbines, and control system parameter equivalence.By comparing the simulation results of the detailed model and the equivalent model, the validity of the proposed dynamic equivalence method for wind farm is verified.
【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】：TM315

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