Impact of Narrow Pulse on High-Switching Frequency Three-Phase Current Source Rectifier

In this article, it is discovered that when the switching frequency increases, the current source rectifier (CSR) will suffer from a grid-side current distortion problem at the sector boundary. One of the reasons for this problem is the presence of narrow pulse at the sector boundary. To overcome this problem, a narrow pulse compensation solution is proposed. The solution attempts to alleviate the negative effects of narrow pulse from two aspects: 1) Avoiding the switch with an on-type narrow pulse in the drive signal to affect the turn-on/-off times of the corresponding bridge legs. 2) Improving the switching performance of the switch with an off-type narrow pulse in the drive signal by using a metal-oxide-semiconductor field-effect transistor with lower blocking voltage to make the actual switching characteristics closer to the ideal switching characteristics. An analysis of the generation mechanism of narrow pulse and its impact on the grid-side current is presented in this article. A 3 kW industrial prototype is also built to verify the effectiveness of the proposed solution. The test result shows that the proposed solution can effectively suppress the grid-side current distortion phenomenon, and improve the performance of CSR at high-switching frequency.