Author:
Herzog F,Röder J,Frehn A,Ruhe N,De Doncker R W
Abstract
Abstract
Grid faults introduce highly dynamic electrical and mechanical loads to a wind turbine (WT). Especially WTs with a direct grid connection like the doubly-fed induction generator (DFIG) are strongly affected. The behavior of a WT during grid faults can be tested in low voltage ride through tests (LVRT). But there are numerous influencing factors on the behavior of the DFIG during a LVRT which have not yet been fully investigated. The pre-fault operating point of the DFIG, the grid inductance, the pre-fault phase angle of the grid voltage, the fall time of the voltage as well as the start and end values of the voltage drop affect the electromagnetic torque and the short circuit current of the generator. Therefore, many LVRT test results for DFIGs are neither comparable nor representative. In this paper it is shown that the peaks of electromagnetic torque and currents during LVRTs can be reduced. A low pre-fault torque and rotational speed, a high grid inductance and a slow voltage drop can minimize the impact of a grid fault. The rotational speed is especially critical because it influences the slip of the DFIG and, thus, has an influence on the dynamics of the fault.
Subject
General Physics and Astronomy
Reference17 articles.
1. Adjustable speed generators for wind turbines based on doubly-fed induction machines and 4-quadrant igbt converters linked to the rotor;Muller;Conference Record of the 2000 IEEE Industry Applications Conference,2000
2. Investigation of Dynamic Loads in Wind Turbine Drive Trains Due to Grid and Power Converter Faults;Röder;Energies,2021
3. Dynamic behaviour of dfg-based wind turbines during grid faults;Erlich;IEEJ Transactions on Industry Applications,2008
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献