Research On Two-stage Matrix Converter And Its Application

Two-stage matrix converter (TSMC) is a kind of new power converter with novel topology based on conventional matrix converter (CMC). It compares to matrix converter not only has the same advantages such as:sine wave input and output current, adjustable power factor, bidirectional energy flow and small volume, etc, but also the clamp circuit is more simple, control algorithm and commutation strategy are more reliable. In the AC speed system, using two-stage matrix converter in adjustable speed drives could achieve high performance as well as to meet the electromagnetic interference requirement. Therefore, two-stage matrix converter has wide application foreground and potential in the field of high performance AC regulating speed system.Firstly, this thesis introduces the research background and application research situation of two-stage matrix converter, the research and the basic theory of two-stage matrix converter. Through comparison and analysis of conventional matrix converter and two-stage matrix converter, this thesis introduces topology, rectifier and inverter double space vector modulation strategies, and the two level coordinated optimization control strategy in detail. Based on the analysis of two-stage matrix converter principles and technologies, the proposed control strategy has been validated through simulations on the platform of Matlab/Simulink. Meanwhile, experimental platform of TSMC based on digital signal processor (DSP) and Field - Programmable Gate Array (FPGA) is built. Through the experimentation, the content of this thesis has got initially.Then, aiming at the problems of TSMC output performance is often effected by disturbance. This thesis analyzed of the matrix rectifier which evolved from the rectifier circuit of two-stage matrix converter. According to unbalanced three-phase input voltages working conditions, and the DC output voltage is not easy to get as the feedback information. This thesis presents a fuzzy feed-forward compensation control method is used to ensure the stability of the DC output voltage, The simulation and experimental results show the effectiveness of this method.Finally, induction motor governing systems fed by two-stage matrix converter including a variable volt-age variable frequency system, and a vector control system based on the rotor field orientation are built, and the static and dynamic performance are analyzed, The simulation results show that induction motor governing systems fed by matrix converter have a good speed tracking performance and a fast torque response.