摘要
分析了广义电网电压骤升(含对称、不对称骤升)故障下双馈风电机组电磁暂态过渡过程,评估了影响机组高电压穿越运行的关键因素,并梳理了电压骤升、骤降故障诱发双馈机组脱网机理的异同。提出了一种基于瞬态灭磁控制和无功电流支持的双馈机组高电压穿越控制方案。仿真和实验结果表明,所述方案能够显著加快故障电网条件下双馈感应电机定子磁链中直流、负序分量的衰减,进而快速抑制机组电磁转矩和母线电压的波动;同时能够满足并网规范对机组无功电流输出的要求,实现机组的故障穿越运行。
A high voltage ride-through（HVRT） control strategy is presented for doubly fed induction generator（DFIG） of wind turbines in this paper based on the transient demagnetizing control and reactive current support. Firstly, the electromagnetic transient process of the DFIG during generalized grid voltage swell is analyzed in detail, including both the symmetrical and asymmetrical condition.Some key factors, which can influence the turbines＇ HVRT capability, are evaluated. Furthermore, the disconnection mechanisms of a DFIG system are compared and summarized between voltage swell and dip conditions. It is verified by both the simulation and experimental results that the proposed control can dramatically accelerate the attenuation of the DC and negative sequences in the stator fluxes under grid fault. As a result, the pulsations in the electromagnetic toque and DC-link voltage are suppressed to a large extent, while the reactive current output requirement is satisfied. Finally, the turbines＇ HVRT capability is enhanced.
出处
《可再生能源》
CAS
北大核心
2016年第1期21-29,共9页
Renewable Energy Resources
基金
国家自然科学基金(51507190)
中国博士后科学基金(2015M582863)
国家电网公司风光储联合发电运行技术实验室支持项目
关键词
双馈感应电机
高电压穿越
无功电流支持
灭磁控制
doubly-fed induction generator
high voltage ride-though
reactive current support
demagnetizing control
