Abstract
Matrix converter has a very good application prospect for its ability to solve the low power factor and serious harmonic pollution problem in Ac-Ac power transformation. But the commutation security and complexity is the main reason to restrain its promote application. The paper presents an improved two-steps safe commutation strategy on the basis of analyzing the characteristics of the existing traditional converter through the direction of output current and input voltage amplitude controlled. In order to reduce the number of switch and solve the influence of current direction with effective combination of two-way switch tube conduction state by dividing sector in the input voltage; Introduced the transitional interval and zero vector modulation to avoid the short circuit when voltage amplitude are close to, which can improve waveform quality. Executed experiment in the prototype controlled by the DSP+FPGA, experimental data verified the feasibility of the new commutation strategy.
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