Abstract
This article presents an ac voltage controller that can operate under a wide range of loads, thanks to its high robustness to plant-model variations. A robust voltage controller is required in a droop-controlled inverter that operates connected to a grid or in island mode with other generators. In such modes of operation, the voltage source converter can experience large load-impedance variations depending on the number of parallel generators or the grid impedance value. Concerning the controller performance, the transient response is improved by selectively minimizing the output impedance of the system at the frequencies that typically contain the largest components of the output current. Complete harmonic control is achieved due to its zero output impedance at a set of design-selected frequencies. The proposed controller only measures the output voltage, and it contains a single-loop structure that uses all available bandwidth. In addition, a fast converter-current estimator provides protection against faults and inrush output currents. The design process only requires, as input parameters, the LC filter values, the sampling frequency, and a set of harmonics where load-current circulation is expected.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | 8843846 |
| Tidsskrift | IEEE Transactions on Industry Applications |
| Vol/bind | 56 |
| Udgave nummer | 1 |
| Sider (fra-til) | 403-421 |
| Antal sider | 19 |
| ISSN | 0093-9994 |
| DOI | |
| Status | Udgivet - 1 jan. 2020 |
Bibliografisk note
Funding Information:Manuscript received November 23, 2018; revised March 6, 2019 and July 1, 2019; accepted September 13, 2019. Date of publication September 17, 2019; date of current version January 16, 2020. Paper 2018-IPCC-1139.R2, presented at the 2018 IEEE Energy Conversion Congress and Exposition, Portland, OR, USA, Sep. 23–27, and approved for publication in the IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS by the Industrial Power Converter Committee of the IEEE Industry Applications Society. This work was supported in part by the Spanish Ministry of Science and Innovation, in part by the European Regional Development Fund (ERDF) of the European Commission under Project DPI2016-75832, and in part by the FPU Scholarship FPU14/00683. The work of J. M. Guerrero was supported by The Villum Fonden under the Villum Investigator Grant 25920. (Corresponding author: Jesús Doval-Gandoy.) D. Pérez-Estévez and J. Doval-Gandoy are with the Applied Power Electronics Technology Group, University of Vigo, 36310 Vigo, Spain (e-mail: dieperez@uvigo.es; jdoval@uvigo.es).
Publisher Copyright:
© 1972-2012 IEEE.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.