The Design Of Three-level Inverter

Three-levelinverterhavebeenwidelyusedinhigh-voltageandhigh-Powerapplication fields.Amongmanyofitsmodulationstrategies,SpaceVectorModulationhasbeenoneofthe most popularresearch points.Themainadvantagesofthestrategyarethefollowing:it provideslargerundermodulationrangeandofferssignificantflexibilitytooptimizeswitchin gwaveforms;it is wellsuitedforimplementationonadigital computer:ithashigherDCvoltageutilizationradio.Firstly, this paper describes the type of three-level inverter topology, the basicworking principle of voltage space vector(SVPWM) algorithm. Then, based on the above principle, the software control algorithm of SVPWM is studied.Amathematicalmodelofthethree-levelinverterwassetup.Basedonthestatefeedbackd ecoupling,thedual-close-loop controlofDCmotor is appliedtothree-levelinverter.Asaresult,thethree-levelinverterhasfavorabledynamic andsteadystate performance,sinusoidaloutput current.After a theoretical study, simulation model of thesystem is set up to achieve the SVPWM algorithm using MATLAB / SIMULINK. The resultsshow the feasibility of the algorithm.Using laboratory resources, a comprehensive hardware circuit for three-level inverter is built, including the main circuit and isolation drive circuit. The software iscontrolled by the type of FPGA chipEP2C80208 C, including SVPWM modulation programming. Continuously through hardware and softwaredebugging, waveform analysis and data from experiments prove the correctness of the designof the SVPWM control strategy issues, and voltage waveform is obtained.