双馈风电机组故障特性及低电压穿越研究
发布时间：2018-08-24 11:26
【摘要】：随着近年来能源危机、环境污染和气候变暖等问题的出现，人们的目光转向了可再生能源的开发和利用。由于风力发电绿色环保，可持续利用，世界各国都将其作为能源战略的重要组成部分。随着风电规模越来越大，风电在电网中所占比例逐年增加，风电接入后对电网的影响越发凸显。电网故障对以双馈感应发电机（DFIG）为主的风电机组影响甚大。本文主要针对风电机组的故障特性和低电压穿越进行研究。 本文首先介绍了DFIG的运行原理，构建了三相静止坐标系和dq同步旋转坐标系下的DFIG数学模型。在此基础上介绍了网侧变换器和转子侧变换器的数学模型及作用，搭建了基于d轴电网电压定向矢量控制的网侧变换器和基于定子磁链定向矢量控制的转子侧变换器控制框图。 其次，详细分析了对称及不对称故障情况下，DFIG的故障特性。推导出三种不对称故障转子感应电动势峰值的表达式，结合转子侧变换器的控制能力揭示了转子侧过电流的根本原因。由转子感应电动势峰值与转差率的函数曲线，以转子侧最大控制电压为约束，推导出三种不对称故障的低电压穿越域，以此来衡量转子侧控制方法下DFIG对于不对称故障的低电压穿越能力。 最后，，在PSCAD中搭建DFIG风电机组暂态仿真模型，分别以对称故障和不对称故障情况下DFIG故障特性进行仿真分析，并对推导所得的低电压穿越域进行验证。在并网点接入STATCOM，给出STATCOM容量的选取方法，通过仿真分析说明接入STATCOM后抬高了机端电压，降低了转子感应电动势峰值进而提高了风电机组的低电压穿越域。
[Abstract]:With the emergence of energy crisis, environmental pollution and climate warming in recent years, people have turned their attention to the development and utilization of renewable energy. Wind power generation is regarded as an important part of energy strategy all over the world because of its green environment and sustainable use. With the increasing scale of wind power, the proportion of wind power in power grid increases year by year, and the influence of wind power on power grid becomes more and more prominent. The fault of power grid has a great influence on the wind turbine which is dominated by the doubly-fed induction generator (DFIG). In this paper, the fault characteristics and low voltage traversing of wind turbine are studied. In this paper, the operation principle of DFIG is introduced, and the mathematical model of DFIG in three-phase stationary coordinate system and dq synchronous rotating coordinate system is constructed. On this basis, the mathematical models and functions of grid-side converter and rotor-side converter are introduced, and the control block diagram of grid-side converter based on voltage-oriented vector control of d-axis power network and rotor side converter based on stator flux directed vector control is constructed. Secondly, the fault characteristics of DFIG under symmetric and asymmetric faults are analyzed in detail. The expressions of the peak value of rotor induced electromotive force for three kinds of asymmetric faults are derived, and the fundamental cause of rotor side overcurrent is revealed in combination with the control ability of the rotor side converter. Based on the function curve between the peak value of rotor induction electromotive force and the slip rate and the maximum control voltage of rotor side, the low voltage traversing domain of three kinds of asymmetric faults is deduced. The low voltage traversing ability of DFIG for asymmetric faults under rotor side control is evaluated. Finally, the transient simulation model of DFIG wind turbine is built in PSCAD, and the characteristics of DFIG fault under symmetrical and asymmetric faults are simulated and analyzed respectively, and the derived low-voltage traversing domain is verified. The method of selecting the capacity of STATCOM is given by accessing the STATCOM, at the parallel node. The simulation results show that the terminal voltage is raised and the peak value of rotor induced electromotive force is reduced, and the low voltage traversing region of the wind turbine is improved.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614
本文编号：2200676
[Abstract]:With the emergence of energy crisis, environmental pollution and climate warming in recent years, people have turned their attention to the development and utilization of renewable energy. Wind power generation is regarded as an important part of energy strategy all over the world because of its green environment and sustainable use. With the increasing scale of wind power, the proportion of wind power in power grid increases year by year, and the influence of wind power on power grid becomes more and more prominent. The fault of power grid has a great influence on the wind turbine which is dominated by the doubly-fed induction generator (DFIG). In this paper, the fault characteristics and low voltage traversing of wind turbine are studied. In this paper, the operation principle of DFIG is introduced, and the mathematical model of DFIG in three-phase stationary coordinate system and dq synchronous rotating coordinate system is constructed. On this basis, the mathematical models and functions of grid-side converter and rotor-side converter are introduced, and the control block diagram of grid-side converter based on voltage-oriented vector control of d-axis power network and rotor side converter based on stator flux directed vector control is constructed. Secondly, the fault characteristics of DFIG under symmetric and asymmetric faults are analyzed in detail. The expressions of the peak value of rotor induced electromotive force for three kinds of asymmetric faults are derived, and the fundamental cause of rotor side overcurrent is revealed in combination with the control ability of the rotor side converter. Based on the function curve between the peak value of rotor induction electromotive force and the slip rate and the maximum control voltage of rotor side, the low voltage traversing domain of three kinds of asymmetric faults is deduced. The low voltage traversing ability of DFIG for asymmetric faults under rotor side control is evaluated. Finally, the transient simulation model of DFIG wind turbine is built in PSCAD, and the characteristics of DFIG fault under symmetrical and asymmetric faults are simulated and analyzed respectively, and the derived low-voltage traversing domain is verified. The method of selecting the capacity of STATCOM is given by accessing the STATCOM, at the parallel node. The simulation results show that the terminal voltage is raised and the peak value of rotor induced electromotive force is reduced, and the low voltage traversing region of the wind turbine is improved.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614
【参考文献】
相关期刊论文 前10条
1 贺益康;周鹏;;变速恒频双馈异步风力发电系统低电压穿越技术综述[J];电工技术学报;2009年09期
2 侯世英;房勇;曾建兴;殷忠宁;;应用超级电容提高风电系统低电压穿越能力[J];电机与控制学报;2010年05期
3 梁亮;李建林;许洪华;;双馈感应式风力发电系统低电压穿越研究[J];电力电子技术;2008年03期
4 胡家兵;孙丹;贺益康;赵仁德;;电网电压骤降故障下双馈风力发电机建模与控制[J];电力系统自动化;2006年08期
5 姚骏;廖勇;;基于Crowbar保护控制的交流励磁风电系统运行分析[J];电力系统自动化;2007年23期
6 王伟;孙明冬;朱晓东;;双馈式风力发电机低电压穿越技术分析[J];电力系统自动化;2007年23期
7 胡家兵;贺益康;;双馈风力发电系统的低压穿越运行与控制[J];电力系统自动化;2008年02期
8 项真;解大;龚锦霞;张延迟;;用于风电场无功补偿的STATCOM动态特性分析[J];电力系统自动化;2008年09期
9 杨淑英;张兴;张崇巍;谢震;曹仁贤;;电压跌落激起的双馈型风力发电机电磁过渡过程[J];电力系统自动化;2008年19期
10 张禄;金新民;战亮宇;;电网电压不对称跌落下双馈风电机组转子电压分析[J];电力系统自动化;2012年14期
本文编号：2200676
本文链接：https://www.wllwen.com/kejilunwen/dianlilw/2200676.html
