RT Journal Article
A1 Feng Jia
A1 Xu Cai
A1 Zheng Li

PB iet
T1 Fluctuating characteristic and power smoothing strategies of WECS
JN IET Generation, Transmission & Distribution
VO 12
IS 20
SP 4568
OP 4576
AB The electric power output of the wind energy conversion system (WECS) fluctuates owing to the inherent feature of the wind speed, which do harm not only to the power grid it connected into, but also to the lifetime of power converters. The electric power fluctuation characteristic of WECS is analysed in frequency domain under overall wind speed to facilitate the planning of distribution grids and to reveal the key factors influencing power fluctuation under different operation modes. The analysis results are well-validated by detailed simulations. On the basis of power fluctuation characteristic analysis, the power-smoothing schemes are carried out in different operation modes. In variable-speed mode, an enhanced optimal torque control is proposed for power smoothing. In constant-speed mode, the control bandwidth of speed loop or the slope of look-up table is decreased to smooth the electric power, and a feed-forward pitch control is proposed to prevent the wind turbine from exceeding safe speed. In constant-power mode, the suggested power-smoothing scheme is worked out. The analysis results and the proposed control schemes are verified by refined co-simulation platform based on GH bladed and real-time digital simulator.
K1 power grid
K1 co-simulation platform
K1 look-up table
K1 constant-speed mode
K1 wind energy conversion system
K1 wind turbine
K1 electric power fluctuation characteristic analysis
K1 electric power output
K1 variable-speed mode
K1 speed loop control bandwidth
K1 enhanced optimal torque control
K1 real-time digital simulator
K1 WECS
K1 frequency domain analysis
K1 power smoothing strategies
K1 GH bladed simulator
K1 feedforward pitch control
K1 distribution grid planning
K1 power converters
DO https://doi.org/10.1049/iet-gtd.2017.1758
UL https://digital-library.theiet.org/;jsessionid=747rm1ik818lm.x-iet-live-01content/journals/10.1049/iet-gtd.2017.1758
LA English
SN 1751-8687
YR 2018
OL EN