| With the rapid development of power electronics technology, requirements forhigh performance of power inverter increasing, the digitized control of power inverterhas become a trend. In order to improve the output waveform of inverter effectively,providing high-quality AC power, the inverter control strategy has been the focusresearch in the field of inverter systems. Putting the single-phase inverter powersystem as the research object, the paper studied the application of repetitive controlstrategy based on virtual resistance in power inverter.The paper established the mathematical model of the single-phase inverter andexpounded its working principle firstly. The basic structure of output LCL filter circuitof inverter power is analyzed, to against the problem of shock and waveformdistortion caused by no-load of output filter circuit and perturbations appeared ininput terminal, virtual resistance ideology is proposed and parameters of LCL filtercircuit based on virtual resistance are designed. The paper is focused on analysis ofrepetitive control algorithm based on virtual resistance in inverter power system.Though modeling and simulation for embedded repetitive control algorithm andrepetitive control algorithm based on virtual resistance by MATLAB.The paper conducts the hardware and software design of single-phase inverterpower system. Hardware design includes the control chip TMS320LF2407and itsperipheral circuits. The software adopting modular design, in addition to the mainprogram, includes system initialization module, interrupt service module, subroutineof SPWM waveform, and the subroutine of repeat control algorithm based on virtualresistance.Based on the above research and design, building a single-phase power inverterdevice using the control algorithm realized by DSP, and the experimental result showsthat the control algorithm can achieve better control effect. |
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