Research On The Parallel Control Technology Of Three-Phase Inverter

With the continuous development of modern power electronic technique, power technology research and development has also got corresponding progress. As the main part of dc power-supply, three-phase inverter plays an important role in the field of office automation, medical service, communication, and national defense. In order to improve the capacity and stability of power supply, modular power supply system has became an important direction of three-phase inverter power supply, meanwhile, the parallel technology of inverter power supply has been the research hotspot as well.On the basis of deeply researching on Control theory techniques of inverter parallel operation, this Article firstly established Mathematical model of Three-phase inverter power supply on the research of Single Inverter, which have been analyzed after transferring into synchronous rotating coordinate system, which designed filter parameters by the means of analyzing Frequency Domain Transfer Function of filters.This article discuss the way on controlling a single three-phase inverter power supply, adopting the propose of Double-loop control, and on the basis of control measures of inductor current inner loop which can Feedback loop by Outputting voltage ,and using the theory of automatic control, combining with the model of Inverter transfer function. Thus it produced the parameter of controller, and then established Simulation Model on mat lab, analysing its performance both on dynamic and static.During the course of analyzing the parallel model of Three-Phase inverter power supply, the Article started from analyzing its Circulation causes. Then it described power characteristics and voltage Closed-loop characteristics of Parallel system by calculating.And then the Articles analyzed the difference of amplitude and phase, and the differences in filter parameters on the impact of circulation by Simulation.At last, the Articles put forward Parallel Control measures on the basis of principal and subordinate, which established 2 three-phase inverter power supply simulation model on mat lab. On the condition that the parameter variation isserious, a safe operation of the parallel system can be ensured by controlling thecircumfluence at a lower level.