In view of the traditional AC Electronic Load based on the innerring current PI control is poorer, dynamic response and vulnerable network side wave interference, based on the circuit of dual PWM converter, reference three-phase PWM rectifier controlled by rotating coordinate transformation are active and reactive current to eliminate the steady-state error of the model, put forward single-phase PWM rectifier (VSR) rotating coordinate transformation models, by constructing virtual current and feedforward decoupling and combined with orthogonal self-adjusting PI control based on BP neural network, at the same time in the stability of DC bus voltage load simulation of the current vector control, improve the load simulation of dynamic and steady-state characteristics. The experimental results show that under pure resistance, inductive resistance and capacitive resistance load simulation, the control method can effectively improve the load simulation response. Compared with the conventional PI, the self-tuning PI control based on BP neural network, the overshot can be reduced by about 10% and the adjustment time can be reduced by about 9ms when the reference current is 1A step response.#$NLKeywords: Single-phase PWM rectifier; Rotation coordinate transformation; Feed forward decoupling; BP neural network