An overview about VSCF and LVRT in wind power generation

In recent years, wind power has been developing rapidly. As the wind power penetration from large scale wind turbines has been increasing rapidly in the transmission system, there is a higher requirement for the frequency stability and power generation efficiency of the wind power generation system, and the power grid puts forward higher continuous operation requirements for the grid connected wind turbine in the power grid fault and demand that the wind power generator has to ride through the grid faults, especially the grid voltage dips. This overview mainly introduces the variable speed constant frequency and low voltage ride through technology in the wind power generation system. This paper introduces respectively their development, technical problems and future trend. Wherein three main programs of VSCF wind power generator system are presented: DFIG, BDFG and PMSG, two types of LVRT technology are summarized: DFIG and PMSG.