计及双馈风电机组的电力系统次同步振荡抑制策略研究

发布时间：2018-04-19 21:33

本文选题：次同步振荡 + 串联补偿　；参考：《西南交通大学》2017年硕士论文

【摘要】：风能的大规模应用是现代电力系统进步和发展的重要标志。如今,我国风电产业规模的迅速扩大,风电场并网问题愈来愈突出。为了解决我国风能赋存与负荷需求逆向分布的格局,电力系统采用了大量基于电力电子技术的灵活调控装置,包括可以提高线路输送能力和增强系统稳定性的串联补偿设备。但双馈风电场经串联补偿设备并网会诱发系统次同步振荡现象。因此,研究含双馈风电场的电力系统次同步振荡问题具有很强的工程实践意义。本文首先从研究电力系统次同步振荡基本理论出发,分析了引起次同步振荡的因素及作用机理。根据使用方法和分析结果侧重点不同,讨论了一些常用分析方法和行之有效的抑制策略。然后,建立了考虑风力机、双馈感应发电机、变流器及带串补输电线路的改进IEEE第一标准模型,并进一步建立全系统状态方程,给出了线性化的系统小信号模型。接着,根据小干扰稳定性理论,基于系统状态矩阵的各模态特征值,分析出影响系统次同步振荡的主要因素为串联补偿度。接着,采用复转矩系数分析法进一步分析了系统电气阻尼的变化。最后,给出了基于STATCOM的次同步阻尼控制策略,并在DigSILENT/Power Factory进行仿真验证。仿真结果表明,本文设计的控制策略能有效抑制计及双馈风电机组电力系统次同步振荡。
[Abstract]:The large-scale application of wind energy is an important symbol of the progress and development of modern power system. Nowadays, with the rapid expansion of wind power industry in China, the problem of wind farm grid connection is becoming more and more prominent. In order to solve the reverse distribution pattern of wind energy storage and load demand in China, a large number of flexible control devices based on power electronics technology are used in power system, including series compensation equipment which can improve transmission capacity and enhance system stability. But a doubly-fed wind farm connected to the grid by a series compensator will induce the sub-synchronous oscillation of the system. Therefore, the study of subsynchronous oscillation in power system with doubly-fed wind farm is of great practical significance. In this paper, the basic theory of subsynchronous oscillation in power system is studied, and the factors that cause subsynchronous oscillation and its mechanism are analyzed. Some common analytical methods and effective suppression strategies are discussed according to the different emphasis of using methods and analysis results. Then, the improved IEEE first standard model considering wind turbine, doubly-fed induction generator, converter and transmission line with series compensation is established, and the equation of state of the whole system is further established, and the linearized small signal model of the system is given. Then, according to the theory of small disturbance stability and based on the eigenvalues of the state matrix of the system, it is analyzed that the main factor affecting the sub-synchronous oscillation of the system is the series compensation degree. Then, the complex torque coefficient analysis method is used to further analyze the change of the electrical damping of the system. Finally, the sub-synchronous damping control strategy based on STATCOM is presented and simulated in DigSILENT/Power Factory. The simulation results show that the control strategy designed in this paper can effectively suppress the sub-synchronous oscillation in the power system of doubly-fed wind turbine.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM712

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