Control method for realizing multi-level carrier wave comparison PWM (Pulse Width Modulation)

Abstract

The invention discloses a control method for realizing multi-level carrier wave comparison PWM (Pulse Width Modulation), comprising a reference wave separation loop, a carrier wave generation loop, an integrated comparison loop and a PWM distribution loop, wherein the reference wave separation loop and the carrier wave generation loop are starting and ending loops of an algorithm and are of parallel relation, the integrated comparison loop, the reference wave separation loop and the carrier wave generation loop are serial connection relation, the PWM distribution loop and the integrated comparison loop are of serial connection relation, the input of the PWM distribution loop is a reference wave signal, the output of the PWM distribution loop is a layered signal and a reference wave separation signal, the output of the reference wave separation loop is the layered signal and the reference separation signal, the output of the carrier wave generation loop is a carrier wave signal, the output of the integrated comparison loop is an integrated PWM signal, and the output of the PWM distribution loop is a PWM output signal. The control method for realizing the multi-level carrier wave comparison PWM, disclosed by the invention, has the advantages of simple control system, multi-level output, high reliability, and more flexible control system.

Description

technical field [0001] The utility model relates to the field of power electronics and motor control, in particular to a control method for realizing multi-level carrier comparison PWM. Background technique [0002] In the multilevel converter equipment, one of the cores of the control system method is the multilevel PWM control method. The current practice is to generate a reference wave through a digital controller, then compare the reference wave signal with multiple carriers, and then generate a PWM control signal output to control multiple power devices to achieve multi-level power output. The characteristic of this current control method is that there must be multiple carrier signals, and additional hardware equipment is required to generate these carrier signals. At the same time, when the number of multi-level stages increases, the carrier signals also need to increase accordingly. This traditional approach increases the hardware equipment of the control system, inc...

AI Technical Summary

Problems solved by technology

This traditional approach increases the hardware equipment of the control system, increases the cost and complicates the control system, thereby affecting its reliability. The block diagram of the traditional multi-level PWM control method is shown in the appendix figure 1

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