Operating performance analysis on wind turbines with the speed regulating differential mechanism

In this paper, a hybrid transmission system is presented for variable-speed constant-frequency wind turbines (WTs). This approach employs an electrically controlled speed regulating differential mechanism (SRDM) so that the synchronous generator is able to rotate at a stable speed and, thus, generat...

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Bibliographic Details
Published in:Journal of renewable and sustainable energy 2018-11, Vol.10 (6)
Main Authors: Yin, Wen-liang, Rui, Xiao-ming, Liu, Lin, Hu, Xin
Format: Article
Language:English
Subjects:
Computer simulation
Electric power systems
Feasibility studies
Hybrid systems
Permanent magnets
Reactive power
Rotor speed
Stability analysis
Synchronous motors
Transient stability
Voltage sags
Wind power
Wind turbines
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Summary:In this paper, a hybrid transmission system is presented for variable-speed constant-frequency wind turbines (WTs). This approach employs an electrically controlled speed regulating differential mechanism (SRDM) so that the synchronous generator is able to rotate at a stable speed and, thus, generate electricity in constant frequency regardless of the changing wind rotor speed. In order to find out the operating performance of the proposed SRDM-based WT, a detailed 1.5 MW simulation model is established by which the speed-regulating accuracy, the electrical harmonic pollutions, and the system low-voltage ride-through (LVRT) capability are all studied in depth and then compared with those of the existing direct-drive or double-fed wind power systems. Simulation results indicate that, under various wind conditions, SRDM can efficiently regulate the output power frequency with satisfactory deviations by using a low-power (less than 262 kW) permanent magnet synchronous motor. Compared to the existing WTs, the 5th, 7th, 11th, and 13th current harmonics of the proposed WT are all ideally reduced to 0.4% of the fundamental current. Moreover, around 0.45 p.u., reactive power can be provided for the rapid recovery of the grid during severe voltage sags. The output power quality, system transient stability, and LVRT capability are all improved. Theoretical analysis and case studies give good verifications of the feasibility and superiority of the proposed SRDM-based WT.
ISSN:1941-7012
1941-7012
DOI:10.1063/1.5046784