Design And Realization Of Control Strategy For Dual-Buck Inverter Based On Multi-core DSP

The development of industrial technology modernization can not be separated from energy,in order to achieve "win-win" of industrial development and environmental protection,it needs to accelerate the cultivation and development of new energy sources.The ultimate goal of new energy development and research is to achieve maximum energy efficiency which is related to the transformation and effective convergence with the power grid.In some of the DC power supply as the main energy,such as solar energy,wind energy,battery,fuel cells and so on.DC-AC inverter technology is focused on research.As a key part of energy conversion,the whole efficiency of the inverter and the final output power waveform quality is good or bad which have a significant impact to the quality of new energy grid.Firstly,the development process of the improved circuit topology and related digital control algorithm based on dual buck half-bridge inverter is reviewed in this paper.Introduces some measures to realize the high frequency control of the digital control inverter,such as improving the controller frequency,optimizing the software design,cooperating with multiple microcontrollers,CPU + CLA and multi-core DSP.Faced with increasingly sophisticated hardware inverter topology,software control algorithms,Single-core DSP frequency is difficult to raise the problem and high requirements of system design indicators.The developed direction of inverter system is bound to the high-frequency and digital parallel control of multi-core DSP.In view of the above-mentioned review,this paper presents a dual buck full-bridge inverter as the experimental platform.It uses the excellent and mathematical computing performance of multi-core DSP TMS320F28377D microcontroller to expand the design of relevant hardware and software platform and inverters' study of multi-core,high-frequency,parallel control and strategy design.First of all,it takes time to study multi-core DSP TMS320F28377D,design the external hardware circuit,establish multi-core software architecture and lay the platform of experimental control.Then,the circuit topology of the inverter is introduced and the working mode of the inverter is analyzed.It gives the whole designed scheme of the system and the final control objectives.The dual-closed-loop SPWM control algorithm is used in this paper and its design is optimized.On this basis,it shloud build up the inverter prototype platform which is composed of main circuit,signal sampling circuit,control circuit,drive isolation circuit and auxiliary power circuit.Based on the experimental platform of hardware and software,this paper studies the multi-core inverter of high-frequency and digital control which is a design of parallel control strategy.It analyzes how to realize the optimization of the program from single-core to multi-core and gives the parallel control strategy of high-frequency which is related to software design.Finally,the simulation and experiment are done according to the designed requirements.The waveforms of the static effect and the dynamic response are given.The correctness and feasibility of the designed system and the parallel control strategy are verified.Under the digital control of high frequency,the whole machine of the inverter system is superior and the output waveform is lifelike.