电力系统自动化Issue(18)：13-19,7.DOI:10.7500/AEPS20131209015
非对称电网故障下的双馈风电机组低电压穿越暂态控制策略
LVRT Transient Compensation Strategy for Doubly-fed Wind Turbines Under Asymmetrical Grid Faults
摘要
Abstract
For the conventional crowbar-based low-voltage ride-through (LVRT) strategies for doubly-fed induction generator (DFIG),not only is the flexibility of the driving converter not made full use of,but also today”s stringent grid-connection codes can hardly be well satisfied.Besides,some transient compensation based control strategies for asymmetrical grid fault are short of experimental verifications.Therefore,the electromagnetic transients of DFIG during grid faults are analyzed and discussed at length,based on which it is found that the high rotor terminal voltage during the process is mainly caused by the direct current (DC) and negative-sequence components included in the stator fluxes.To overcome the impact,an effective LVRT strategy is studied,in which some transient compensations based on the DC and negative-sequence components are provided to the rotor circuit timely and exactly.With the compensations,the magnitude of the transient rotor voltage is reduced to the lowest level for allowable rotor currents.As a result,the transient controllability of DFIG is strengthened,and the controllable range of voltage dip is expanded.Therefore,the performance of LVRT for DFIG is improved.The proposed analysis and design is validated by experiment on an 1 1 kW test-rig for wind turbines. This work is supported by National Natural Science Foundation of China(No.51107025).关键词
暂态补偿/低电压穿越/双馈感应发电机/风力发电Key words
transient compensation/low-voltage ride-through (LVRT)/doubly-fed induction generator (DFIG)/wind power generation引用本文复制引用
杨淑英,陈刘伟,孙灯悦,谢震,张兴..非对称电网故障下的双馈风电机组低电压穿越暂态控制策略[J].电力系统自动化,2014,(18):13-19,7.基金项目
国家自然科学基金资助项目(51107025)。 （51107025）
