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Stepwise Inertial Control of a Doubly-Fed Induction Generator to Prevent a Second Frequency Dip
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 Title & Authors
Stepwise Inertial Control of a Doubly-Fed Induction Generator to Prevent a Second Frequency Dip
Kang, Mose; Lee, Jinsik; Hur, Kyeon; Park, Sang Ho; Choy, Youngdo; Kang, Yong Cheol;
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To arrest a frequency nadir, a stepwise inertial control (SIC) scheme generates a constant active power reference signal of a wind turbine generator (WTG) immediately after a disturbance and maintains it for the predetermined time. From that point, however, the reference of a WTG abruptly decreases to restore the rotor speed for the predefined period. The abrupt decrease of WTG output power will inevitably cause a second frequency dip. In this paper, we propose a modified SIC scheme of a doubly-fed induction generator (DFIG) that can prevent a second frequency dip. A reference value of the modified SIC scheme consists of a reference for the maximum power point tracking control and a constant value. The former is set to be proportional to the cube of the rotor speed; the latter is determined so that the rotor speed does not reach the minimum operating limit by considering the mechanical power curve of a DFIG. The performance of the modified SIC was investigated for a 100 MW aggregated DFIG-based wind power plant under various wind conditions using an EMTP-RV simulator. The results show that the proposed SIC scheme significantly increases the frequency nadir without causing a second frequency dip.
Stepwise inertial control;Second frequency dip;Minimum rotor speed;Doubly-fed induction generator;
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