By analyzing the influence of the typical existing automatic voltage regulator(AVR)stator current limiter on voltage stability

it is proved that not only is it unable to protect the safety of the generating set equipment

but also it will aggravate the collapse of voltage. Based on V-curve characteristics of the single-machine infinite-bus system

the stator current is reduced to minimum when the power factor of generator terminal is less than the external power angle of the system

which is the minimum stator current identification criterion. On this basis

this paper proposes a way of optimization to improve stator current limit network performance and suggestions for system impedance setting. The test results have validated the effectiveness of the proposed method.