For the fast switch of EPS which is from the utility power output to the inverter output, the article suggests that SVPWM modulates invert carrier via the close-cycle Control of voltage and phase, so as to synchronize the invertor output with the utility power output. In the article, we make use of Simulink modules, one of the toolboxes of MATLAB, to model and simulate the system. This environment is easily modeling, clearing structure and convenient operation. The results demonstrate that we can flexibly control voltage of inverter via feedback element and lock phase to satisfy our needs.