A design method for the reinforcement scheme of the typical regional power grid with high proportion of renewable energy using VSC-HVDC technology is proposed in this paper.Considering the characteristics of the regional power grid with high proportion of renewable energy

three main factorsres tricting its safe and stable operation is analyzed firstly.Then from the perspective of enhancing the safe and stable operation of power grids

two VSC-HVDC reinforcement schemes are designed by taking Chuxiong Power Grid in Yunnan as an example.A method to determine the location and capacity of the VSC-HVDC system in the regional power grid with high proportion of renewable energy is proposed further and three technical indexes to evaluate the VSC-HVDC schemes

namely line load rate

voltage level and the strength of the VSC connection point are summarized.It is shown by the calculation resultthat following the proposed design methodology

the two VSC-HVDC schemes can reduce the line load rate of those lines with severe overload problems to less than 90%

which is a good solution to the line overload problem of the electromagnetic loop networks with high generation of renewable energy;With the VSCHVDC technology

the voltage level of key buses in Chuxiong area is increased by 10%-19% during the faulted period

effectively increasing the voltage level of the system.