Research On DC-AC Inverter Control Strategy Based On Direct Energy Control

DC-AC transformation technology,also known as inverter technology,is the DC(Direct Current)into the AC(Alternating Current)of a technology.As natural gas,coal,petroleum and other traditional based energy used by a lot of people come to realize that the traditional energy will eventually be exhausted,then people will attention to the direction of new energy,how to use and development of new energy become the focus of people.Will get new energy from the DC electrical energy is converted into a constant voltage constant frequency alternating current,and connected to the grid,the whole process of DC,AC transformation technology in the field of the utilization of new energy and development has played a very key role.Paper first choose two kinds of commonly used DC-AC transform modulation technology,sine pulse width modulation(SPWM)and space voltage vector pulse width modulation(SVPWM),these two kinds of modulation technique is widely used in the current inverter technology,cooperate with PI controller and the voltage and current double closed-loop,realize the whole closed-loop control.This article from the principle analysis of two kinds of modulation mode,through the analysis of the result set up corresponding simulation experiment platform of choice set up in MATLAB/SIMULINK based on PI controller of SPWM three-phase DC-AC transformation simulation system and SVPWM based on PI controller three-phase DC-AC transformation simulation system,and made a series of steady state dynamic experiment is used to compare two kinds of modulation mode,verify the feasibility of two kinds of modulation mode and dynamic steady-state spy.Based on SPWM modulation and SVPWM modulation,a dc-ac transform technology based on direct energy control is proposed based on some deficiencies in the dynamic steady-state of the two modulated modes.Have a certain phase,frequency,amplitude of the output voltage is represented by the energy must,for energy in the system only control target,do not use the PI controller in order to avoid the lag of the steady state dynamic effects.After the establishment of the theory,the simulation construction work.The dc-ac transform system based on direct energy control is built in MATLAB/SIMULINK.The feasibility and correctness of the design of DC-AC transform system based on direct energy control are verified by Matlab simulation.At the same time,the DC-AC conversion system based on direct power control steady-state analysis of dynamic characteristics of the corresponding experiment,through the analysis of DC,AC transformation technology based on direct power control of the advantages and disadvantages.At the completion of the DC-AC conversion system based on direct power control under the premise of overall scheme,paper designs the control system based on DSP and write a DC-AC transformation based on direct power control system of the main program,interrupt service subroutine,and each function module configuration program.Then,the corresponding debugging of dc-ac transform system based on direct energy control is carried out.Finally,the paper gives the experimental results,which proves the correctness and feasibility of dc-ac transform system based on direct energy control.