An analysis on low voltage ride through of wind turbine driven doubly fed induction generator with different resistances and quitting time of Crowbar

作者：Zhu Xiaodong; Shi Lei; Chen Ning^*; Zhu Lingzhi; Liu Haoming; Liu Jun

来源：Automation of Electric Power Systems, 2010, 34(18): 84-89.

• Analytical expressions
• Crowbar protection
• DFIG
• Doubly fed induction generators
• Doubly-fed induction generator
• Grid-connected
• Grid-side converter
• Low-voltage ride-through
• LVRT
• Over-voltages
• Rotor current
• Rotor voltage
• Short-circuit fault
• Simulation result

In the case of serious faults with the grid, the Crowbar protection circuit is frequently adopted to implement low voltage ride through (LVRT) of the grid-connected wind turbine driven doubly fed induction generator (DFIG). The LVRT effect is greatly influenced by the resistance and quitting time of Crowbar. From the viewpoint of magnetic linkage in the case of a three-phase short-circuit fault occurring at the terminal of DFIG, the analytical expression of the short-circuit rotor current is deduced together with the estimated expression. The method for Crowbar resistance setting is proposed. To validate the rotor current expressions deduced, analyze the impact of Crowbar resistance on maximum short-circuit rotor current and its appearing time, and find the influence of resistance and quitting time of Crowbar on the LVRT effect, a series of simulations are conducted on a 1.5 MW DFIG. Simulation results show that: the analytical expression and the estimated expression presented in this paper can depict the rotor current correctly;with an increase of Crowbar resistance, the maximum short-circuit rotor current is gradually decreased and the appearing time is gradually advanced from the half grid-synchronized cycle to zero, but the maximum rotor voltage is gradually increased. On condition that the grid-side converter be not over-voltage, if the Crowbar resistance is fairly great at the rational level and the Crowbar quits before the fault is eliminated, the LVRT effect would be better.

• 出版日期2010
• 单位河海大学