In view of the vector control of synchronous rotating d-q coordinate system need complex coordinate transformation, and it is difficult to eliminate the system steady-state error problem. This article for the grid-connected inverter control put forward a new control strategy based on the two-phase stationary coordinates with LCL filter of the improvement of PR controller, reduce the complex rotary coordinate transformation and simplify the control algorithm. The no steady-state error tracking control strategy can realize the grid current instruction signal communication, active reactive power at the same time achieve the static coordinate system (PQ) decoupling control. And finally through the simulation shows that with the improved grid inverter PR controller has excellent dynamic and static control performance, and realized the current without steady-state error tracking, for low harmonics, and specify the harmonic has a strong inhibition, has important practical value.
