Fluctuating characteristic and power smoothing strategies of WECS

Feng Jia; Xu Cai; Zheng Li

Fluctuating characteristic and power smoothing strategies of WECS

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Author(s): Feng Jia^{1, 2} ; Xu Cai^{1, 2} ; Zheng Li³
- Affiliations: 1: School of Electronic Information and Electrical Engineering , Shanghai Jiao Tong University , Dongchuan Road No. 800, Minhang District, Shanghai , People's Republic of China ;
  2: Wind Power Research Center , Shanghai Jiao Tong University , Dongchuan Road No. 800, Shanghai , People's Republic of China ;
  3: College of Science and Technology , Donghua University , North Renming Road No. 2999, Songjiang District, Shanghai , People's Republic of China
Source: Volume 12, Issue 20, 13 November 2018, p. 4568 – 4576
DOI: 10.1049/iet-gtd.2017.1758 , Print ISSN 1751-8687, Online ISSN 1751-8695

Received 19/11/2017, Accepted 25/04/2018, Revised 12/03/2018, Published 04/05/2018

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.

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Fluctuating characteristic and power smoothing strategies of WECS

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