Abstract
The paper discusses the application of PWM delta modulation with PI controller as an alternative to the standard PWM techniques for providing gating signals to the voltage source inverters. Its inherent characteristics of constant volts/Hertz control without feedback complexity and boosting of the fundamental voltage makes it an excellent choice for motor drive applications. This paper discusses the comparison between a basic delta modulation, the advanced Delta modulation with PI controller and an optimized DMPI. It is shown that in addition to the aforementioned advantages, VSI with optimized DMPI produces superior load current/voltage waveforms compared to simple DMPI, when IGBT is employed as a switching device for the inverter. Since the tacho feedback or other traditional speed sensing means is not permissible in sealed motor or the pump, a novel method is used to monitor the motor speed from the terminal quantities like voltage, current, and motor input power factor.
Highlights
The fundamental aim of any PWM switching is to eliminate the lower order harmonics at relatively minimal commutation of inverter switches
This paper discusses the comparison between a basic delta modulation, the advanced Delta modulation with PI controller and an optimized DMPI
It is shown that in addition to the aforementioned advantages, VSI with optimized DMPI produces superior load current/voltage waveforms compared to simple DMPI, when IGBT is employed as a switching device for the inverter
Summary
The fundamental aim of any PWM switching is to eliminate the lower order harmonics at relatively minimal commutation of inverter switches. Attraction of the delta modulation (DM) technique is that it guarantees that the on and off time of the inverter switches will never fall below a given minimum value. DM technique is an established alternative to the traditional sinusoidal PWM switching used in Commercial voltage source inverters driving AC motors. Previous work on DM [1,2,3,4] has discussed the objectives, qualities and advantages of delta modulation (DM) technique already from a very specific point of view. The optimal switching frequency and the harmonic control can be achieved by:. In delta modulation, finding the base frequency i.e. frequency up to which the DM retains constant V/f characteristic, is quite important. The base frequency the inverter enters constant voltage region (CVR).
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