撬棒投入对双馈风机电磁功率暂态特性影响

摘要

The penetration of wind energy is increasing and the system stability is related to the electromagnetic power of wind generators. This paper studies the impact of crowbar on the transient characteristics of doubly-fed induction gen⁃erator(DFIG)electromagnetic power during grid faults. The equation of DFIG electromagnetic power is derived based on the mathematical model of DFIG,and the influencing factors related to DFIG electromagnetic power is analyzed. In contrast with the DFIG that does not bave any crowbar,the dynamic transient characteristics of the above factors and their impact on the electromagnetic power are discussed with the utilization of crowbar. Theoretical analysis and simula⁃tion results indicate that the electromagnetic power of a crowbar-based DFIG fluctuates severely,and it cannot be con⁃sidered as a constant. The results of this research provide a theoretical basis for further research on the impact of DFIG on the system transient stability.%风电的装机容量在电网中所占比例不断增加，其电磁功率特性会对系统的稳定性产生影响。本文研究了故障期间撬棒投入对双馈风机电磁功率暂态特性的影响。以双馈风机数学模型为基础，推导了双馈风机电磁功率的表达式，分析了影响双馈风机电磁功率的相关因素。从理论上分析了撬棒投入后，与电磁功率相关因素的暂态特性变化及其对电磁功率产生的影响，并与不投入撬棒情况进行了对比分析。通过理论分析和仿真表明，在故障期间，投入撬棒使得双馈风机电磁功率输出具有很大的波动性，不能简单认为保持不变，这也为含撬棒的双馈风机对电网暂态稳定性的影响研究提供了基础。