Thyristor Switched Series Resistor for Low Voltage Ride Through of Weak Tie Connected Wind Farms with SCIGs
Date Issued
2014
Date
2014
Author(s)
Yang, Tzu-Yi
Abstract
Series resistors can be used to improve generator voltage dip due to a fault in the grid and enhance generator fault ride-through (FRT) or low voltage ride-through (LVRT) capability. To determine proper values for the inserted series resistance, transient stability analysis and small signal stability analysis are performed on squirrel-cage induction generators connected to the grid through a weak tie. Stable regions for transient stability and small signal stability were plotted. It is concluded from the results from stability analyses that different values of series resistors should be used for different fault voltages in order to ensure wind farm stability. To achieve the goal of variable series resistances under different fault voltages, a thyristor switched series resistor (TSSR) which comprises four thyristor switched resistors connected in series is proposed in this paper. Control laws for the TSSR are derived. Simulation results indicate that generator terminal voltage and electromagnetic torque are raised under various fault events and the LVRT capability is improved by using the proposed TSSR.
Subjects
風力發電
鼠籠式感應發電機
低電壓穿越
閘切串聯電阻
暫態穩定度
小訊號穩定度
Type
thesis
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