Design And Implementation Of Three Phase Inverter Based On Double Closed Loop Control Technology

The coming of the energy crisis and the rising of public environmental protection,leads to the proportion of new energy(e.g.wind power,tidal power,solar power)keep increasing.Meanwhile,the rapid development and extensive application of computer network technology,makes the security of network become more and more important.The demand for security and high-quality electric power is growing.Therefore,uninterrupted power supply(UPS),emergency power supply(EPS)are widely used in modern office buildings and Internet firms.The inverter power is one of the key technologies in the application of these is the inverter system,which makes the inverter power supply technology become important practical significance.This dissertation is focused on designing the three phase inverter based on double closed loop control technology.The main work can be summarized the following point.(1)Since each phase of three-phase inverter system is independently and without coupling,A mathematical model of single-phase half bridge inverter system can be built,then the combination of the three single-phase half bridge,a mathematical model of three-phase inverter system is built.(2)The SVPWM waveform modulation technology,is adopted to make the inverter output voltage waveform is close to the ideal sinusoidal waveform,and improve the utilization ratio of bus voltage and reduce the harmonic content of output voltage;(3)A double closed loop control strategy is designed.The inner control fast dynamic performance through the instantaneous value,to ensure that the rate of low output distortion,outer ring with output voltage average control signal,and in the inner loop outside the output waveform amplitude adjustment,ensure the output accuracy of the system is higher;(4)Based on TMS320LF2407 A chip,the hardware circuit and software system of the inverter are designed and implemented respectively;(5)The prototype is tested,and the control function and performance of the designed inverter can meet the design requirements.The results shows that the designed three-phase inverter based on double closed-loop control technology owns the advantages that it structure is simple structure and can be easy realize.