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Doubly Fed Induction Generators (DFIG) becomes quite common employed in the wind farms. But the main disadvantage of DFIG is that it's very sensitive to grid disturbance, especially for the voltage dip. It could cause over voltage and over current in the rotor windings and consequently damaged the rotor side converter. In this paper, the author first made a theoretical analysis to the rotor current...
In the paper, a new field ground fault protection with voltage injection is introduced. The injection voltage of protection is a low frequency square wave voltage, it is transformed from an AC voltage by transformer, rectifier and electronic switches, and its frequency is controllable. The principle, criterion and hardware configuration of protection are given, and several operation problems are analyzed...
Based on the summary of the research about internal short circuit faults and the main protection scheme for huge multi-branch hydro generator, the significance to research transient process in faulty condition is pointed out in the paper. By far, there almost have no perfect simulation model suits for generator optimized main protection scheme research based on internal fault transient process simulation...
The paper analyzed all the possible faults that may happen in stator of Pubugou 600 MW multi-branch hydro generator. And transient electrical characteristics of these faults are simulated by simplified simulation model, which is constructed based on dual damper in each pole principle. Based on simulation data, the protection effects of different protection theories under different stator branch grouping...
In order to analyze the dynamic performance for hydro-generator under loss of excitation (LOE) condition more effectively, based on MATALB, a mathematical model of hydro-generator under LOE condition is constructed in this paper. The model includes synchronous generator model, speed governor model, hydraulic turbine model, excitation regulation model and transmission line model. Several types of LOE...
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