In order to improve permanent magnet synchronous generators (PMSGs) low voltage ride through (LVRT) capability and operation stability after LVRT, a comprehensive control strategy (CCS) of PMSG based on variable resistance and power factor is proposed, which can be described as that, a series circuit of IGBT and variable-value unloading resistor is utilized in the DC side, a dynamic reactive power compensation device based Magnetically Controlled Reactor (MSVC) is utilized under long period faults, the series circuit and MSVC device are accessed according to the comparison of actual voltage value and preset limit voltage. According to the voltage drop level, the reactive power generated by PMSG is adjusted. A simulation model is established in PSCAD/EMTDC, based on parameters of an actual operational PMSG with the output power of 1.5 MW, the efficiency of the proposed control strategy is verified under different unloading resistances and power factors. The results shown that, not only the LVRT capability of PMSG can be enhanced, but also the operation stability after LVRT can be improved. This work is supported by National Natural Science Foundation of China (No. 51267019 and No. 51467019).