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Open AccessArticle

A Control Scheme with the Variable-Speed Pitch System for Wind Turbines during a Zero-Voltage Ride Through

1
School of Automation, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Beijing 100081, China
2
Department of New Energy, GD Power Development Co. Ltd., Beijing 100101, China
3
GD Power Inner Mongolia New Energy Development Co. Ltd., Hohhot 010040, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(13), 3344; https://doi.org/10.3390/en13133344
Received: 3 May 2020 / Revised: 24 June 2020 / Accepted: 28 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Design, Fabrication and Performance of Wind Turbines 2020)
Zero-voltage ride through (ZVRT) is the extreme case of low-voltage ride through (LVRT), which represents the optimal grid-connection capability of wind turbines (WTs). Enforcing ZVRT will improve the dynamic performance of WTs and therefore significantly enhance the resiliency of renewable-rich grids. A control scheme that includes a pitch system is an essential control aspect of WTs riding through voltage dips; however, the existing control scheme with a pitch system for LVRT cannot distinguish between a ZVRT status and a power-loss condition, and, consequently, does not meet the ZVRT requirements. A system-level control scheme with a pitch system for ZVRT that includes pitch system modeling, control logic, control circuits, and overspeed protection control (OPC) is proposed in this paper for the first time in ZVRT research. Additionally, the field data are shared, a fault analysis of an overspeed accident caused by a voltage dip that describes the operating status at the WT-collapse moment is presented, and some existing WT design flaws are revealed and corrected by the fault analysis. Finally, the pitching performance during a ZVRT, which significantly affects the ZVRT performance of the WT, is obtained from laboratory and field tests. The results validate the effectiveness of the proposed holistic control scheme. View Full-Text
Keywords: control scheme; variable-speed pitch; wind turbine (WT); zero-voltage ride through (ZVRT); low-voltage ride through (LVRT); overspeed protection control (OPC) control scheme; variable-speed pitch; wind turbine (WT); zero-voltage ride through (ZVRT); low-voltage ride through (LVRT); overspeed protection control (OPC)
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MDPI and ACS Style

Cai, E.; Yan, Y.; Dong, L.; Liao, X. A Control Scheme with the Variable-Speed Pitch System for Wind Turbines during a Zero-Voltage Ride Through. Energies 2020, 13, 3344.

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