Software Design For 10kW Micro-grid Inverter Based On DSP

With a global energy crisis and the increasingly serious environmental pollution, energy development and utilization of renewable are becoming more and more attention of the human. Solar energy as one of the renewable energy is an inexhaustible, cheap and non-pollution, and could large-scale exploitation in the world, photovoltaic grid-connected power generating has been world attention. And solar photovoltaic grid-connected power generating is the main development tendency in utilization, and it will get fast development. In addition, with the appearing of the high-performance digital signal processing chip (DSP), makes some complex, advanced control strategy in the application of photovoltaic grid-connected inverter become possible.This thesis, in this context, have a more depth study to the new photovoltaic micro-grid inverter (have micro-grid characteristics of photovoltaic inverter), taking three phase 10kW micro-grid inverter as research object, taking the best utilization of solar energy and providing for load stable and reliable power supply as the main goal, using TI company production of high-performance 32-bit DSP (TMS320F28335) as control chip, conducting photovoltaic micro-grid power generating system'theory and experiment research, have important practical significance. This paper'major works are as follows:Firstly, summarizes the background and significance of the research and the research status of photovoltaic industry at domestic and overseas.Secondly, analyzes the system structure of photovoltaic micro-grid power generating systems, expounds the main features of photovoltaic micro-grid power generating systems, and analyzes, in detail, the main component part of the system.Then, aimed at photovoltaic micro-grid inverter gird-disconnected and grid- connected two operation mode adopted by the control strategy has made the detailed analysis, presents the PI controller, SPWM wave generating, phase-lock-loop technique such key links control software has made the detailed analysis, and gives each link of the corresponding detailed program flowchart.Finally, with simulation and experiment debugging, gives part of the simulation and experiment results waveform and analysis.In conclusion, this paper mainly analyzes photovoltaic micro-grid inverter grid-disconnected, grid-connected two operation mode control strategy. Through the comparison of several control strategy, grid-disconnected operation mode adopts voltage closed-loop control strategy, grid-connected operation mode adopts modified triangle wave comparative current control strategy, and makes the simulation of the control strategy. Through the related simulation and experimental results demonstrate that the control strategy has good dynamic and stable performance.