High Performance Single and Double Loop Digital and Hybrid PID-Type Control for DC/AC Voltage Source Inverters

Marian Blachuta, Robert Bieda and Rafal Grygiel
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Marian Blachuta: Department of Automatic Control and Robotics, Silesian University of Technology,16 Akademicka St, 44-100 Gliwice, Poland
Robert Bieda: Department of Automatic Control and Robotics, Silesian University of Technology,16 Akademicka St, 44-100 Gliwice, Poland
Rafal Grygiel: Department of Automatic Control and Robotics, Silesian University of Technology,16 Akademicka St, 44-100 Gliwice, Poland

Energies, 2022, vol. 15, issue 3, 1-25

Abstract: The concept of hybrid control has been introduced, in which the analog implementation of the control algorithm is combined with a digital algorithm for determining the PWM duty cycle. Single-loop PD and PID control systems are compared to a double-loop architecture with additional capacitor current sensing for both digital and hybrid controller realizations. The performance is measured as the THD value under resistor-capacitor rectifier load. It has been shown that a properly constructed continuous-time model of a digital controller with a PWM power converter behaves like the actual discrete-time system, which allows for a simple controller analysis and design. The role of a PWM type for capacitor current feedback is emphasized. The simulation models of a real inverter are presented, which are used to tune the controllers and to evaluate the control performance for both rectifier and abruptly changing resistive load. The obtained solutions achieve the THD values comparable to the VSI without load. The results are contrasted with the control methods based on resonant filters.

Keywords: UPS inverter; carrier frequency; PWM types; PID control; resonant controllers; hybrid analog-digital control; capacitor current feedback; THD performance evaluation; modeling; simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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