双馈异步风力发电机低电压穿越的软撬棒控制  

An LVRT Control Strategy Based on Soft Crowbar Control for Doubly Fed Induction Wind Power Generations

作　　者：杨晨星 杨旭[1] 童朝南[1] YANG Chenxing;YANG Xu;TONG Chaonan(Key Laboratory of Knowledge Automation for Industrial Processes of Ministry of Education （School of Automation and Electrical Engineering, University of Science and Technology Beijing）, Haidian District, Beijing 100083, China)

机构地区：[1]工业过程知识自动化教育部重点实验室(北京科技大学自动化学院)

出　　处：《中国电机工程学报》2018年第8期2487-2495,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(61673053);北京市自然基金项目(4162041);中央高校基本科研业务费专项资金(FRF-BR-16-025A)~~

摘　　要：针对双馈异步风力发电机（double-fed induction generator,DFIG）系统低电压穿越问题,基于经典的定子磁场定向、功率解耦控制系统,提出了一种基于灭磁理论的DFIG系统软撬棒控制方法。该方法利用三步预测检测电网故障的发生,控制灭磁电流的切入切出,并根据电网故障的程度动态调整灭磁电流大小,达到电网电压骤降时,有效减小系统震荡时间,使DFIG系统不离网的同时,又能保护DFIG系统的目的。采用该方法计算灭磁电流的大小不依赖于系统模型,使DFIG系统的自适应性和鲁棒性增强。描述了电网电压骤降时带给DFIG系统的危害,理论分析了系统特性,给出了软撬棒控制的理论依据和实施方法,最后通过仿真验证了方法的有效性。This paper proposed a soft crowbar control strategy on the DFIG based on the flux damping current theory, stator field oriented, power decoupling control to solve the problem of low voltage ride through（LVRT）. By detecting the change of the grid voltage, soft crowbar control strategy determine the magnitude of flux damping current and the time when cut in and cut out flux damping current. Without adding hardware equipment, DFIG can went through grid voltage sig, and shortening torque oscillation time. This paper described the damage to DFIG system caused by voltage sags of power grid. The system characteristics were analyzed theoretically. The theory basis and the implementation method of the soft crowbar control strategy were provided. Finally, the simulations on a 1.5 MW DFIG system with soft crowbar control strategy were given. It shows that the proposed control strategy is effective, and the DFIG system has strong adaptability and robustness.

关 键 词：风力发电 双馈异步发电 低电压穿越 灭磁控制 软撬棒控制 

分 类 号：TM315[电气工程—电机] TM614