Research on offshore wind farm VSC-HVDC transmission system fault ride through issue

With the development of power electronics technology, VSC-HVDC has been applied in some offshore wind farm integration projects in Europe by IGBTs and PWM control technology. At the same time, a lot of works have been done on wind farm AC integration fault ride through, and certain results have been achieved, but offshore wind farm DC integration fault ride through issue needs to be studied deeply. The paper focus on offshore wind farm VSC-HVDC transmission system fault ride through. Based on AC and DC wind energy integration stability influence analysis, compared the different integration mode technology characteristics, the main stability influence factors of DC integration will be given. Then the offshore wind farm VSC-HVDC transmission system fault ride through scheme is studied according to the wind farm capacity. Chopper and wind turbine coordinated control scheme will be adopted to provide dynamic reactive support on the basis of the system meeting the requirements of the fault ride through. Finally, a practical example is done to verify the correctness and effectiveness of the proposed scheme.