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- Title
Simple Discrete Control of a Single-Phase Voltage Source Inverter in a UPS System for Low Switching Frequency.
- Authors
Rymarski, Zbigniew
- Abstract
Previous research has shown that the inverter output voltage distortions are higher for low switching frequencies, and it is impossible to increase the controller gains because it will cause oscillations of the output voltage. The main reason is the real frequency domain characteristic of the PWM modulator and measuring traces, which can be modelled as switching periods delays. The thesis of this paper is that by using the control system that takes care of these delays, it is possible to decrease output voltage distortions for the standard loads for relatively low switching frequencies (e.g., 12,800 Hz). The Luenberger observer was implemented in the multi-input-multi-output passivity-based control of the system with the delay, in order to predict the state variables of the inverter. It is shown that state variable prediction is unnecessary for high switching frequencies (e.g., 51,200 Hz). The theory, simulations and breadboard verification, using the inverter model controlled with the real-time interface MicroLabBox, are presented.
- Subjects
IDEAL sources (Electric circuits); PASSIVITY-based control; VOLTAGE control; PULSE width modulation transformers; REAL-time control; VOLTAGE
- Publication
Energies (19961073), 2023, Vol 16, Issue 15, p5717
- ISSN
1996-1073
- Publication type
Article
- DOI
10.3390/en16155717