According to the demand for precise and low-cost management of voltage sag

it conducts research based on targeted thinking.Firstly

it takes the position of voltage sag sensitive equipment as the access position of voltage sag compensation equipment.It constructs the target function of voltage sag control to achieve the optimal resource allocation of voltage sag compensation equipment.Then

it applies the double closed-loop control strategy to the voltage sag compensation equipment.Based on the root locus analysis

it proposes the optimal gain design method of the inner loop and the discrete domain controller of the voltage loop.Finally

it further researches the design method of the voltage loop critical damping parameters and conducts simulation tests.The experimental results show that the proposed method can realize the optimization of active damping and effectively improve the compensation accuracy of the voltage sag compensation equipment.