基于VSC-HVDC的风电系统低电压穿越技术综述

摘要

轻型高压直流输电系统（VSC-HVDC）是风电技术的重要发展方向。随着风电比重快速增加，电网对风电机组及其并网系统地低电压穿越（LVRT）能力提出了更高的要求。本文首先分析了电压跌落对VSC-HVDC系统和风电机组的影响，继而简要地总结了风电机组LVRT技术，然后对各种适合于VSC-HVDC风电系统的LVRT方案进行了分析评价，并重点讨论了该风电系统的LVRT协调控制技术。%Long-distance large-capacity wind farm connected to the grid by the VSC-HVDC transmission system will be an important trend of the wind power technology development. With the rapid increase in the proportion of wind power, the grid has a higher demand for the Low Voltage Ride-through(LVRT) ability of the wind turbine and its grid systems. The influence of voltage drop on the VSC-HVDC system and wind turbine is firstly analyzed. Meanwhile, the LVRT technology for the wind turbine is summarized briefly. Then, several types of LVRT solutions for the VSC-HVDC based wind power systems are analyzed and evaluated. In the end, the LVRT coordination control methods are mainly discussed.