Transient stability and FRT technologies of different synchronous wind turbine

With the global energy transformation towards to a 100% renewable-based power system, the installed capacity of renewable energy generation has continued to grow rapidly in recent years. At the same time, due to the loss of synchronous machines, the grid-connected large-scale renewable energy bring great challenges to the safe and stable operation of power grid. In order to improve the stability of power grid, different synchronous wind turbine have widely attracted the attention of academia and industry. That is totally different on transient stability of vector synchronous wind turbine and self-synchronous wind turbine, and the fault ride through (FRT) control strategy is also different. Thus, the transient stability and FRT technologies of vector synchronous wind turbine and self-synchronous wind turbine are studied separately. There are many solutions for the FRT of vector synchronous wind turbine from different technical schemes. According to the different scope of application and implementation methods, it can be roughly divided into two categories: software improvement and hardware addition. Different FRT strategy of self-synchronous wind turbine are used under a smaller grid fault and serious grid fault, self-synchronous wind turbine recalculate the voltage and phase angle of the potential in the converter according to the PCC voltage, PCC phase angle, reactive power demand and residual active capacity under a smaller grid fault. When there is serious grid fault, the vector control and self-synchronous control modes switching FRT strategy is necessary.