ISSN 1674-0629
CN 44-1643/TK
CN 44-1643/TK
Study on Electrical Quantities of Doubly Fed Wind Turbines Considering Control Strategy Switching During the Entire Low Voltage Ride Through Process
Shuqiang ZHAO , Hongwei ZHANG , Hui WANG
›› 2024, Vol. 18 ›› Issue (8) : 141 -151.
Study on Electrical Quantities of Doubly Fed Wind Turbines Considering Control Strategy Switching During the Entire Low Voltage Ride Through Process
The electrical characteristics of doubly fed induction generators (DFIGs) are easily affected by changes in power grid voltage throughout the entire process of low voltage ride through (LVRT). However, existing researches mostly focuse on the electrical characteristics of DFIGs during faults, without considering the differences in electrical characteristics of DFIGs in different scenarios after fault clearance. There is also limited research on the power characteristics of DFIGs throughout the entire process of LVRT, and the analysis of electrical characteristics throughout the entire process of LVRT is not yet comprehensive. For this purpose, the operation status of DFIG in the entire LVRT process is studied. Before the fault is cleared, the entire process of LVRT is divided into two stages: fault occurrence and reactive power priority control startup. After the fault is cleared, it is analyzed in two situations: secondary use of the pry bar and active power ramp recovery. On this basis, the expressions for the stator side output current and power throughout the entire process of LVRT are derived, and a DFIG simulation model is established in PSCAD. The time-domain simulation results closely match the analytical expression waveform, demonstrating the effectiveness of the proposed method.
doubly fed induction generator / control strategy / crowbar circuit / active power ramp recovery / the entire process of low voltage ride through
the National Key Research and Development Program of China(2023YFB2406800)
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