A Design Of 3×20KW Grid-Connected PV Power System

As Grid-Connected PV Power system applications increasingly widespread, the demands on the performance improvement are also increasing, and attention is turned on the digital control technique. Based on the analysis of the theoretical basis of grid-connected PV system's, this dissertation takes a study on a 3×20KW Grid-Connected PV Power system, with details of the system configuration, grid-connected converter, 3-loop control strategy, as well as the design of the DSP based controller.The grid-connected converter system is constructed with 3 single phase full-bridge converters that use IPM as switching components. The hardware design of the main circuitry including component selection is described. TMS320F240-based controller is designed for the control of the converters to perform control strategies on current, voltage and maximum peak power tracking (MPPT), as well as the protection measures. MPPT is implemented by the strategy of disturbance observer, and Islanding is detected by the effect of active and passive power control.The success of system design and installation is verified by the experimental and operational results.