Switch type power amplifier and method based on parallel interleaved multilevel converter

Abstract

The invention discloses a switch type power amplifier and method based on a parallel interleaved multilevel converter. The switch type power amplifier comprises a rectification unit, an inversion unit, a filtering unit and a control unit. The rectification unit adopts a neutral point clamping (NPC) topology and provides stable direct current voltage for the inversion unit; the inversion unit comprises N power units which are connected in parallel, the power units adopt a multi-level flying capacitor bridge arm topology, the direct current sides of all the power units share the same group of direct current voltage source, and the alternating current sides are output through a coupling inductor; the output equivalent switching frequency at the filtering unit can reach the MHZ level, and a very small single-level LC filter can be used; and the control unit adopts a double closed-loop control strategy to control the rectification unit, and adopts a carrier phase shift modulation technology (CPS-SPWM) and the double closed-loop control strategy based on a quasi-PR controller to control the inversion unit. According to the invention, the switch-type power amplifier with four-quadrant operation, high efficiency, high equivalent switching frequency, high bandwidth, high response speed and high power is realized.

Description

technical field [0001] The invention relates to a switch-type high-power power amplifier, in particular to a power amplifier based on a parallel interleaved multilevel converter. Amplify the given low-voltage and small-current signal into the required high-voltage and high-current signal, which is used in scenarios such as hardware-in-the-loop testing, power grid fault simulation and reproduction, and grid-connected converter testing. Background technique [0002] In recent years, new energy power generation such as photovoltaics and wind power has developed rapidly, and grid-connected inverters are key equipment for efficient and safe grid-connection. In order to improve the stability of the integrated grid, it is necessary to test their dynamic behavior in complex grid environments, such as changes in grid voltage and frequency, voltage distortion, or various fault conditions. Usually, the situation of the power grid is complex and changeable, and it is difficult to condu...

AI Technical Summary

Problems solved by technology

However, switching power amplifiers are limited by the switching frequency of power electronic switching devices, and the bandwidth of switching power amplifiers is still low today.

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