含风电电力系统的暂态稳定分析

发布时间：2018-05-02 22:28

本文选题：含风电电力系统 + 暂态稳定　；参考：《华北电力大学》2014年硕士论文

【摘要】：近年来风电并网容量越来越大,含风电电力系统的暂态稳定分析已成为亟待解决的课题。风电机组多采用异步发电机,本身没有功角,不存在常规的同步稳定问题,实际中风电机组和风电场对电力系统暂态稳定的影响通过常规机组得以体现。目前,含风电电力系统的暂态稳定研究多采用仿真方法,通过分析扰动过程中常规机组的功角变化和特定故障的极限切除时间来判定和研究。本文从含风电电力系统暂态稳定分析方法的建立、方法的完善和应用分析等方面展开相关研究工作,主要工作概括如下： (1)建立双馈风电机组的模型,分析机组各控制模块的数学方程和控制框图,并利用集总参数建模方法,基于风电场内的功率损耗等效原则和容量加权法实现风电场集电系统的化简和等值模型参数的求取,实现双馈型风电场的建模。 (2)在假设系统失稳为两机失稳的基础上,考虑风电场对系统影响最严重的情形,将风电场的机械功率和电磁功率等值为系统等值机械功率的一部分,推导了计及风电时系统的数学模型和功角特性,结合含风电场扩大单机无穷大系统的分析,总结系统等值机械功率在暂态过程中的变化规律,并建立含风电电力系统的扩展等面积分析法；以CIGRE B4-39系统为算例验证使用所提方法定性分析含风电电力系统暂态稳定性的有效性。 (3)提出能够评判机组控制参数对风电机组暂态性能影响大小的灵敏度指标,进而确定影响风电机组暂态特性的关键参数,通过合理配置关键参数实现不同的风电机组控制特性,并深入分析控制特性对系统等值机械功率的影响；进一步地,在机组控制特性相同的情况下,分析不同风电出力对系统等值机械功率的影响；基于分析结果,获取扰动过程中不同控制特性、不同风电出力下系统等值机械功率曲线的变化规律,进一步完善计及风电的扩展等面积分析法。
[Abstract]:In recent years, the wind power grid capacity is increasing, the transient stability analysis of wind power system has become an urgent task to be solved. Most wind turbine units adopt asynchronous generators without power angle, and there is no conventional synchronous stability problem. In practice, the influence of wind turbine and wind farm on the transient stability of power system can be reflected by conventional units. At present, the transient stability of wind power systems is studied by simulation method, which is determined and studied by analyzing the variation of power angle of conventional units and the limit time of specific faults in the process of disturbance. In this paper, the establishment of transient stability analysis method for wind power system, the improvement of the method and the application analysis are carried out. The main work is summarized as follows: 1) establishing the model of doubly-fed wind turbine, analyzing the mathematical equation and control block diagram of each control module of the unit, and using lumped parameter modeling method. Based on the equivalent principle of power loss in wind farm and the capacity weighting method, the simplification and equivalent model parameters of wind farm collector system are obtained, and the modeling of doubly-fed wind farm is realized. Based on the assumption that the instability of the system is two-machine instability and considering the most serious influence of wind farm on the system, the mechanical and electromagnetic power of the wind farm is equated as part of the equivalent mechanical power of the system. The mathematical model and power angle characteristics of the wind power system are derived. The variation of the equivalent mechanical power of the system in transient process is summarized by combining the analysis of the expanded single machine infinite bus system with wind farm. The extended iso-area analysis method for wind power system is established, and the effectiveness of the proposed method for qualitative analysis of transient stability of wind power system is verified by using CIGRE B4-39 system as an example. 3) the sensitivity index which can judge the influence of unit control parameters on the transient performance of wind turbine is put forward, and the key parameters that affect the transient characteristics of wind turbine are determined, and the different control characteristics of wind turbine are realized by reasonable configuration of key parameters. The influence of the control characteristics on the equivalent mechanical power of the system is deeply analyzed. Furthermore, the influence of different wind power output forces on the equivalent mechanical power of the system is analyzed under the condition of the same control characteristics of the unit, and based on the analysis results, The variation law of the equivalent mechanical power curve of the system under different wind power output forces and different control characteristics in the disturbance process is obtained, and the expansion iso-area analysis method taking into account wind power is further improved.
【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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