A novel Proportional Resonant Observer based digital control strategy for 400Hz inverter

Son Tran  Que; Linh Nguyen  Ba; Huynh Van  Diep; Cao Viet  Long; Nguyen Quang  Dich; Nguyen Kien  Trung

doi:10.6180/jase.202503_28(3).0009

A novel Proportional Resonant Observer based digital control strategy for 400Hz inverter

Son Tran Que¹, Linh Nguyen Ba², Huynh Van Diep², Cao Viet Long², Nguyen Quang Dich¹, and Nguyen Kien Trung²This email address is being protected from spambots. You need JavaScript enabled to view it.

¹Institute for Control Engineering and Automation, Hanoi University of Science and Technology, Vietnam

²School of Electrical and Electronic Engineering, Hanoi University of Science and Technology, Vietnam

Received: November 1, 2023
Accepted: April 18, 2024
Publication Date: May 22, 2024

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202503_28(3).0009

This paper studies a novel Proportional Resonant (PR) disturbance observer (PRobs) design for a 400Hz frequency converter Ground Power Unit (GPU), a device that provides electrical power to aircrafts while they are on the ground. The observer is proposed to estimate the output voltage and inductor current, as well as the unmeasurable system disturbances resulting from system parameter variations and load changes. The PR control algorithm, designed to achieve a high gain at resonant frequency, is employed to minimize the estimation error between the estimated and actual states, thereby providing highly accurate estimated values for voltage, current, and system disturbances. A single loop control strategy based on the observer’s estimated output is implemented to regulate the inverter’s output voltage. The system demonstrates strong robustness as disturbances can be estimated and cancelled out. Matlab simulations are initially conducted, followed by real-time simulations using a hardware-in-the-loop (HIL) setup to validate the method’s effectiveness. Finally, the design is verified through experimental testing.

Keywords: Ground power unit, PR observer, disturbance estimation, single loop controller

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