中国电机工程学报2016，Vol.36Issue(6)：1714-1723,1785,11.DOI:10.13334/j.0258-8013.pcsee.2016.06.028
电网电压骤升下双馈风力发电机轴系振荡抑制的改进控制策略
Improved Doubly Fed Induction Generator Drive-chain Oscillation Restrain Control Strategy Under Grid Voltage Swell
摘要
Abstract
Grid voltage symmetrical swell will cause transient DC flux components and higher steady-state flux component in the doubly fed induction generator (DFIG) stator windings. Electromagnetic torque will generate elevated step steady-state disturbance, synchronizing frequency and double frequency transient disturbance .The disturbance is amplified in transmission chain based on two-mass model, and it will cause torsion loadaggravation and oscillation of shaft torque after the grid fault. This paper obtained analytical expressions of electromagnetic torque by analyzing the dynamic behavior of DFIG during symmetrical voltage swell. By analyzing the two-mass model, it can be concluded that flexible transmission chain has the low damping and amplification characteristic to low frequency electromagnetic torque disturbances. A control strategy was proposed to restrain the oscillation of shaft torque after the grid fault. A compensation torque which is proportional to differential of shaft torque was compensated to electromagnetic torque, and a shaft torque observer was designed to obtain the compensation torque. The correctness and effectiveness of this paper was verified by simulation and experimental results.关键词
双馈发电机/电压骤升/轴系振荡/两质量块模型/扭矩观测器Key words
doubly fed induction generator (DFIG)/voltage swell/shaft oscillation/two-mass model/shaft torque observer分类
动力与电气工程引用本文复制引用
谢震,李厚涛,张兴,张旭光,杨淑英..电网电压骤升下双馈风力发电机轴系振荡抑制的改进控制策略[J].中国电机工程学报,2016,36(6):1714-1723,1785,11.基金项目
国家自然科学基金项目(51277050,51077034)。 Project Supported by National Natural Science Foundation of China (51277050,51077034) （51277050,51077034）
