Study On Grid-Connected Inverter Based On Current Closed Loop

The inverter technology has been widely used and has become increasingly mature in the new energy and renewable energy recovery and utilization. General Gird-Connected inverter has become the focus of research. After analyzing the mathematical model and the traditional control method, we design Gird-connected inverter based on current closed loop. Combined with id, iq decoupling control method, we conducted a simulation and experimental analysis. Firstly we introduces the grid inverter technology development status and classification, and gives both the common inverter topology, after determined the system use voltage topology, we calculated the hardware parameters according to the experimental conditions; On this basis, we establish three-phase inverter with a mathematical model, and use clark & park transformation to achieve decoupling control of voltage and current. Through decoupling analysis id, iq and use Id representative active component, iq representative reactive component.Inverter control using iq = 0 mode to meet the power factor of 1 to transfer energy to the grid. We use the typicalâ… system for current closed-loop control. For the control strategy, we use the fuzzy PI composite control method. In the MATLAB / Simulink software platform we build the simulation model of the system, verify the method of the system. We use control chip TMS320F2812 from TI as the main chip for the hardware system design, and complete appropriate program design. Through a large number of experiments, verify the proposed scheme.