基于混合势函数的永磁同步风力 发电机暂态稳定性分析

永磁同步发电机(permanent magnetic synchronous generator, PMSG)作为海上风力发电的主要设备,是风电技术的重要发展方向。然而,PMSG在运行过程中，受到大扰动干扰会导致其暂态稳定性下降。因此,针对PMSG风机大扰动下的暂态稳定性阈值难以判定的问题,本文基于混合势函数理论,建立了PMSG风机系统简化后的混合势函数模型,并推导出PMSG风机在大扰动后的暂态稳定判据。通过仿真后的网侧电流波形和网侧功率波形验证了暂态稳定判据的准确性,并调整各参数数值以分析PMSG风机暂态稳定性与风机参数、故障深度、故障时间和风速的关联性。

Transient stability analysis of permanent magnetic synchronous wind generator based on mixed potential function

Permanent magnetic synchronous generator (PMSG), as the main equipment of offshore wind power generation, is an important development direction of wind power technology. However, the transient stability of PMSG decreases when it is disturbed by large disturbances. Therefore, in view of the difficulty in determining the threshold of transient stability of PMSG fans under large disturbance, this paper established a simplified mixed potential function model of PMSG fan system based on the theory of mixed potential function, and derived the criterion of transient stability of PMSG fans after large disturbance. The accuracy of the transient stability criterion was verified by the simulated grid-side current waveform and grid-side power waveform, and the correlation between the transient stability of PMSG fans and fan parameters, fault depth, fault time and wind speed were analyzed by adjusting the parameter values.