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

Enyu Cai, Yunqiang Yan, Lei Dong and Xiaozhong Liao
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Enyu Cai: School of Automation, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Beijing 100081, China
Yunqiang Yan: GD Power Inner Mongolia New Energy Development Co. Ltd., Hohhot 010040, China
Lei Dong: School of Automation, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Beijing 100081, China
Xiaozhong Liao: School of Automation, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Beijing 100081, China

Energies, 2020, vol. 13, issue 13, 1-22

Abstract: 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.

Keywords: control scheme; variable-speed pitch; wind turbine (WT); zero-voltage ride through (ZVRT); low-voltage ride through (LVRT); overspeed protection control (OPC) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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