The Study On Control Strategy Of Hybrid Two-stage Matrix Converter

Two-stage matrix converter (TSMC) is the potential for considerable development of the matrix converter, it has adjustable input power factor, the output voltage adjustable, two-way flow of energy can be, simple commutation advantages over CMC. Hybrid Two Stage-Matrix Converter (Hybrid TSMC) is a developed new topology on the basis of the TSMC, it is of conventional TSMC advantages, but also overcome its shortcomings: It can better inhibit input imbalances and improve the voltage transfer ratio. This dissertation have control strategies for the Hybrid TSMC as main content.At first, the paper analyzed the hybrid TSMC topology and then set up a simulation model for simplified system as a whole. Analysis the characteristics of the hybrid TSMC topology due to its novel structrue and introduced hybrid TSMC control strategy for the compensation of DC link voltage to restrain the imbalance input. To further enhance the output voltage transmission of TSMC with the former control strategy, the new control strategy, through the elimination of zero vector of TSMC inverter, increase the utilization of DC PWM voltage. At the same time using H-bridge converter of the regulatory function of the input voltage of inverter to ensure that TSMC's output voltage sine symmetry.Simulation verify the correctness of the control strategy.Although the hybrid TSMC open-loop control strategy can improve TSMC's ability to restrain the input imbalance, but were unable to inhibit input voltage fluctuations and load linear disturbance, this paper presents a hybrid TSMC closed-loop control strategy, the entire control system composed by the three parts, respectively feedforward control part, H bridge converter control part, inverter-level closed-loop control part. Feedforward control part of the main guarantee that inverter can get the expected DC PWM voltage whenever the input voltage drop, and closed-loop control of inverter can guarantee system output from the input voltage fluctuations and load changes. Simulation verify the correctness of the control strategy.Design and produced a prototype of the TSMC with DSP. Experimental results show the correctness of modulation strategies, which provides experimental platform for Hybrid TSMC's study.