Study And Realization Of Muti-Motor Synchronization Control System

Matrix Convertor is a "all silicon" power convertor with an advanced circuit topology. Compared with the traditional power convertor, it has a few advantages: the lack of DC -link , the ability of four quadrant operation, the excellent waveforms of input current and output voltage, variable power factor input current. Because of such advantages, Matrix convertor will be prosperous in the future. In abroad, the research of it has developed for a few times. But in china, the research only has begun lately.In this paper, the control method for matrix convertor (MC) is emphasized. Its mathematic mechanism , fundamental principle and four-step current commutation algorithm are described briefly. According to the space vector modulation method of the equivalent structure of the AC-DC-AC conversion , the conversion relations of the matrix convertor were deeply investigated. The AC-AC direct transformation control and the double-space-vector PWM scheme of the matrix convertor were deduced and the modling and simulation of a three-phase matrix convertor were implemented. In this paper, the matrix convertor based on rotor flux oriented with current and speed fed back control is descriped. Due to the lack of the true bi-directional switches at present ,the combinaions of IGBTs controlled by four-step current commutation algorithm were adopted in the simulation, which made the study very close to the reality. Further, the modling and simulation of muti-motor synchronization control system based on the matrix convertor were descriped.The harware based on DSP control sysytem was constructed and the software was designed and written. Experiment of applying the matrix convertor to three-phase induction motor drive were completed. The simulaton and expriment results demostrate the correctness and the feasibility of this scheme.