The Research And Design Of Matrix Rectifier

Rectifier is the most widely used power electronic equipment in industry and daily life. Traditional rectifier produces a lot of harmonic components which can pollute the power grid and reduces its power factor. Bidirectional PWM rectifier can solve these problems to some extent, but it needs bulky energy storaging components and is incapable of four-quadrant operation.Based on these considerations, a kind of matrix rectifier is studied in detail in this paper. This kind of rectifier, which possesses several advantages, is derived from AC-AC matrix converter. It has low harmonics, unit power factor, four-quadrant operation capability and doesn’t need bulky energy storaging components.First, this paper discusses the research significance of matrix rectifier, particularly researches its four non-isolating topologies and chooses one of them, which has single-channel DC output and four-quadrant operation capability, as our research object.The transfer function of matrix rectifier is derived in this paper. Current space vector modulation strategy, or current SVM strategy in short, and double line-to-line voltage synthesis strategy as well as their consistency are investigated. After comparison, current SVM strategy is seen as more suitable for this design. On the basis of traditional current SVM strategy, an improved current SVM strategy with voltage feed-forward control, power factor regulation, common-mode voltage reduction and output voltage feedback is developed. Significance of safe commutation is elaborated, four-step, two-step and one-step commutation methods are studied and compared, four-step commutation method is chosen finally.The matrix rectifier and the proposed current SVM strategy are then preliminary verified by MATLAB/Simulink. Corresponding to the new functions of the improved current SVM strategy, several simulation tests are carried out to verify the matrix rectifier’s control and operation performance. The simulation results prove the correctness of theoretical analysis. Finally, this paper builds an experimental prototype. TMS320F2812produced by TI and XC9572XL produced by Xilinx are used to constitute the control circuit. Switching matrix, filters, voltage and current sensors as well as IGBT drive circuits are designed. The experimental results, accordance with the simulation results, demonstrate the feasibility of the design and strengthen the attractiveness of the matrix rectifier for industry applications.