A novel random hysteresis current control for a single-phase inverter

摘要

Although a hysteresis current control technique is a simple and a reliable modulation scheme in switching control systems, its harmonic spectrum around the switching side band may not distribute properly. Random pulse width modulation technique is an effective scheme that distributes the harmonic spectrum of the load current, and it can reduce the acoustic noise and the mechanical vibration of inverter-fed motor drives. This paper presents a new method for hysteresis current control based on random band control for a better spreading of the harmonic spectrum of the load current. In this paper, the effect of the random-band hysteresis current control is analysed to determine the best hysteresis band variation and the results have been compared with the traditional hysteresis current control. Theoretical analysis and simulations have been performed to describe the method.