Design Of Solar Energy Grid-connected Inverter Based On DSP

As energy issues and environmental pollution problems have become increasinglyprominent, solar energy, as a renewable, clean energy, has been paid atention by moreand more countries, solar energy already has a pivotal position in the world energy field.Compared to the small off-grid power systems, grid-connected power systems can takemore advantages of solar energy which is inexhaustible, solar power grid-connectedsystems will be the future trend. With the deepening of solar power grid-connectedtechnology and the developing of micro-processor technology such as DSP,grid-connected inverter as the key equipment of grid-connected power system, there isgrowing emphasis on its research. Therefore, the article works for the design ofgrid-connected inverter based on DSP.Firstly, the article studies the photovoltaic cell array through the outputcharacteristics of photovoltaic cells, and establishes the engineering mathematicalmodel of photovoltaic cell array, and establishes the simulation model in SIMULINKthen the simulation result proves that the output characteristic curves agree with theactual situation. Based on the simulation model of photovoltaic cell array, this paperanalyzes several MPPT algorithms, establishes the integrated simulation modelcombined with BOOST circuit, then achieves the maximum power point tracking of thePV array.In order to achieve the function of the inverter, this paper analyzes the workingprinciple of grid-connected inverter, selects SVPWM waveform modulation technologyto study current control, analyzes the realization method of SVPWM control method,then deeply analyzes the model of grid-connected inverter system and adaptsvoltage-current double-loop PI control strategy, establishes a simulation model of thegrid-connected inverter system, and the simulation result verifies its correctness.This article proposes a new method using port controlled Hamiltonian and energyshaping control method to study control issues of PV grid-connected power system.This method establishes a PCH model of PV grid-connected system according to theenergy shaping and port controlled Hamiltonian theory and designes the controller ofPV grid-connected system Using energy shaping method of interconnection anddamping configuration, has been. Simulation results verify the correctness of the controlmethod.Based on the theoretical analysis and simulation research, this paper determines thecontrol chip, chooses the appropriate power switch, designes reasonable deviceparameters, and sets up hardware platforms of the system, including the three-phasefull-bridge inverter circuit, filter circuit, control chip, the drive circuit and the protectioncircuit; then the article completes the software design of the system in CCS based onhardware platform, and generates SVPWM wave through the DSP event manager toachieve the inverter function.