The Design Of DSP+FPGA Controller Based On Bidirectional Energy Conversion System (PCS)

Because traditional converter have some disadvantages,such as a single main topology structure,a simple controller system,it hasn't satisfied the need of battery high-power storage energy transformation.At the same time,the voltage of energy storage battery don't match with that of the power grid,an intermediate conversion equipment is needed for energy transfer,thus a set of Energy Conversion System(Power Conversion System,PCS)is designed for meeting the requirements is a key for distributed energy grid.This paper design a PCS grid energy storage system which can basically meet the requirements of high-power energy storage,adopting a two-stage type PCS main topology include bi-directional AC-DC converter and bi-directional DC-DC converter,using DSP+FPGA controller to realize the control system.According to the design requirements of two stage PCS main topology,having calculated the parameter of each element such as the LCL filter,L filter,DC bus capacitors,precharge circuit,AC-DC converter module,DC-DC converter module.On the basis of the characteristics of DSP + FPGA architecture,firstly,controller is divided by function,then respectively complete corresponding hardware design and software design.Hardware circuit mainly including:core control circuit,acquisition circuit,protect circuit,drive circuit etc.Software programs mainly including:DSP chip complete AD interrupt data collection,PC communication,closed loop control strategy program etc,FPGA chip realize protection control,temperature measurement,data exchange,input and output signal control,SPWM wave generating etc.Finally,we Construct a 50KW/380V PCS experimental prototype that meet the requirements.Experimental results verify the rationality of the proposed PCS system topology structure and DSP + FPGA controller,laying a foundation for further study and debugging on the PCS system.