摘要
针对双馈式风力发电机的传统控制策略存在鲁棒性能较差,过渡过程持续时间较长,母线电压过调制等问题,提出一种改进的电压连锁故障穿越控制方案。通过对转子侧变流器采用鲁棒控制策略,网侧变流器采用改进无功电流控制策略,可同时改善双馈式风力发电机的低电压穿越(LVRT)和高电压穿越(HVRT)能力。同时以双馈式风力发电机的定子动态磁链为分析基础,推导其在电压骤降和骤升故障期间的过渡过程特性。仿真表明:所提出的双馈式风力发电机的鲁棒增强控制策略,可有效提高风力机在电网电压连锁故障情况下的穿越性能。
Aiming at the bad robust performance, long transient duration and over-modulation of generatrix voltage for conventional control strategy of doubly-fed wind turbine, an improved voltage chain fault ride through control scheme was put forward. By using robust control strategy on rotor side converter, improved reactive current control scheme was used for grid side converter, the LVRT and HVRT capabilities of doubly-fed wind turbine under cascading grid fault could be improved at same time. Besides, the characteristics of DFIG under voltage sags and swells were studied based on the stator flux of doubly-fed wind turbine during the transient periods of grid voltage changes. The simulation results show that the ride through performance of doubly-fed wind turbine under cascading gird fault is improved by this robust enhanced control strategy.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2014年第12期2387-2394,共8页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51407118
51275312)
深圳市国际合作研究项目(GJHZ20130408173747552)
关键词
双馈感应发电机
高电压穿越
低电压穿越
鲁棒控制
电网连锁故障
doubly-fed induction generator（DFIG）
high voltage ride through（HVRT）
low voltage ride through（LVRT）
robusst control
cascading grid fault
