Aiming at the problem of poor performance of traditional unified power quality conditioner (UPQC) control strategy, this paper proposes a hybrid control strategy combining passivity based control and nonlinear PI control, and establishes the EulerLagrange (EL) model of the unified power quality conditioner (UPQC). Firstly, the current innerloop passivity based controller is designed by injecting damping and the convergence of error energy is accelerated. Then, the nonlinear PI control is adopted and a voltage outer loop controller is designed to obtain more accurate expected current, effectively suppresses the static error, and makes the system has good dynamic and static performance. Finally, a simulation model of the unified power quality regulator is built in Matlab/Simulink. The simulation results based on the model verifies the feasibility of the proposed control strategy.