| The technology of multi module power supply paralleled is an important developmentdirection in inverter, it can achieve the large capacity power supply. In recent years, ecologicalsustainable development problem get more and more attention, the world has taken a series ofmeasures to deal with these problems, the most fetching attention is the new energydevelopment and utilization. Mainly development on solar energy, wind energy, ocean energyand other natural sustainable energy, new energy power system changed rapidly, foreground iswidely. The electricity from power system needs to transform then supply to users. However,as the main part of the power converter in AC, inverter is widely used in industrial and civil.With the increase of the power and electric equipment, the power conversion device’s capacity,reliability and safety requirements are also getting higher and higher, and the deepeningresearch of the power electronic technology theoretical appease users the requirements ofpower supply to provide the necessary guarantees. The parallel operation of three phaseinverter can achieve high capacity and redundant power supply, has high reliability, it is thepreferred embodiment in the present power supply system design, and will become the futuretrend of the inverter technology.Power inverter control technology is a combination of modulation techniques, it cancarry out the waveform output which is needed. The digital is power inverter controltechnology development’s trends and characteristics, not only to achieve a relatively flexible,complex control strategies, but also the structural optimization of the device, the volume isgreatly reduced, reliability is further improved. With the improvement of system performancerequirements, the application of modern control theory and methods to achieve controlintelligence is an important development direction of the power inverter control technology, ingeneral, single-phase inverter power supply control method can be directly applied to threephase system.This paper based on the three-phase inverter power supply for the object of study, firstproof of the significance and the research of present situation for parallel inverter technology,research on the several control methods of inverter parallel operation currently, proposes thesignificance of the technical difficulties on the wireless parallel system, and furthermoreanalyzed the wireless parallel system’s principle and control strategy, studied the parallelprinciple for wireless parallel system, research on the reason and influence of the circulatingcurrent, further define the improved parallel control method to determine the design parameters and the derivation of droop algorithm, and then analyzed the topology structure ofthree-phase inverter, established the mathematical model of three-phase inverter power supplyand decoupling the inverter model in DQ coordinates, which is focused on the study ofthree-phase inverter based on SVPWM double closed-loop control method, design thesystem’s parameters. Simulating the three-phase inverter parallel system control withoutinterconnections in Matlab, in the cases that two inverter parameters have obvious differences,using the droop control strategy to simulate at the rated resistive load, no-load conditions, theresults of simulation shows that the system has good static and dynamic characteristics tomake sure that the parallel assurance system’s operation is stable and reliable.Build the hardware platform. Discussed from the switch tube selection, design of thedriving circuit, structures the main circuit, control circuit’s design, electromagneticcompatibility design and program compiling. Finally made a comparative analysis for thesimulation results and the experimental results demonstrates the correct and effective ofcontrol theory and experimental design. |
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