Research On Closed-loop Control Strategy Of Two-stage Matrix Converter

The two-stage matrix converter is a new kind of power electronic AC conversion device,which is connected with the inverter circuit and the inverter circuit.Compared to the traditional matrix converter device,two-stage matrix converter retains its adjustable input power factor,two-way flow of energy,the ability of four quadrant operation and other advantages,but also has a simple embedding circuit and commutation strategy,and thus become a hot AC-AC converter in the study.Because this kind of AC converter without DC energy storage devices,so the interference effects on the input side reflects the quality of voltage on the output side by the switch directly;the same will in turn role in input.The closed loop control of matrix converter can optimize the output waveform and improve its anti-interference ability.The main work of this paper is as follows:(1)Based on the double space vector modulation method,the Simulink software is used to simulate the two stage matrix converter;(2)In this paper,the input harmonic and output harmonics of the dual stage matrix converter under dual space vector modulation are analyzed;(3)Based on the d-q axis vector model of TSMC,the proportional integral controller of the two-stage matrix converter is designed,and the proportional integral closed-loop control system of TSMC is constructed,and the simulation is carried out by using Simulink software.I t is found that the proportional integral control has a better control effect on the output voltage waveform under the condition of unbalanced three-phase load of TSMC;(4)Finished the design of the TSMC system using repetitive controller,and combined with proportional integral strategy,we propose a new TSMC control strategy,construct the TSMC closed-loop control system based on this control strategy,using Simulink software to carry on the simulation and the simulation results are analyzed.It is found that the compound controller has good control effect on the output voltage waveform of TSMC under unbalanced input voltage and unbalanced three-phase load.