Coordinated Control Strategies of VSC-HVDC-Based Wind Power Systems for Low Voltage Ride Through

• Published in: Energies (Basel) Vol. 8; no. 7; pp. 7224 - 7242
• Main Authors: Zhang, Xinyin, Wu, Zaijun, Hu, Minqiang, Li, Xianyun, Lv, Ganyun
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.07.2015
• Subjects: Control algorithms; Control systems; coordinated control; Economics; Electricity distribution; Energy consumption; hierarchical control; Low voltage; low voltage ride-through (LVRT); Matlab; permanent magnet synchronous generator (PMSG); Strategy; voltage source converter-HVDC (VSC-HVDC); Voltage stability; Wind farms; Wind power; Wind turbines; China
• ISSN: 1996-1073; 1996-1073
• DOI: 10.3390/en8077224

The Voltage Source Converter-HVDC (VSC-HVDC) system applied to wind power generation can solve large scale wind farm grid-connection and long distance transmission problems. However, the low voltage ride through (LVRT) of the VSC-HVDC connected wind farm is a key technology issue that must be solved, and it is currently lacking an economic and effective solution. In this paper, a LVRT coordinated control strategy is proposed for the VSC-HVDC-based wind power system. In this strategy, the operation and control of VSC-HVDC and wind farm during the grid fault period is improved. The VSC-HVDC system not only provides reactive power support to the grid, but also effectively maintains the power balance and DC voltage stability by reducing wind-farm power output, without increasing the equipment investment. Correspondingly, to eliminate the influence on permanent magnet synchronous generator (PMSG)-based wind turbine (WT) systems, a hierarchical control strategy is designed. The speed and validity of the proposed LVRT coordinated control strategy and hierarchical control strategy were verified by MATLAB/Simulink simulations.