Multi-task control strategy for grid-tied inverters based on conservative power theory

Maraf�o, Fernando P.; Brand�o, Danilo I.; Costabeber, Alessando; Paredes, Helmo K.M.

Abstract

In recent years, the concept of decentralizing power generation through the deployment of distributed generators (DGs) has been widely accepted and applied, driven by the growing market of renewable energy sources, in particular photovoltaic, wind and small hydro. These distributed generators are normally equipped with a switching power interface (inverter), acting as front end with the grid. In this scenario this paper proposes a multi-task control strategy for distributed generation inverters that simultaneously allows the DG system to inject the available energy, as well as to work as a voltage drop compensator or as an active power filter, mitigating load current disturbances and improving power quality of the grid. The main contribution of the proposed system, with respect to other solutions in the literature, is that the proposed control loops are based on the Conservative Power Theory decompositions. This choice provides decoupled power and current references for the inverter control, offering a very flexible, selective and powerful control strategy for the DG system. The paper also discusses the choice of the current waveform for injecting/absorbing active power into/from the grid, and both sinusoidal and resistive references have been compared in terms of damping capability. Finally, simulation and experimental results are provided in order to validate the proposed functionalities of the DG control system.

Citation

Marafão, F. P., Brandão, D. I., Costabeber, A., & Paredes, H. K. (2015). Multi-task control strategy for grid-tied inverters based on conservative power theory. IET Renewable Power Generation, 9(2), https://doi.org/10.1049/iet-rpg.2014.0065

• Journal Article Type: Article
• Acceptance Date: Jun 30, 2014
• Online Publication Date: Sep 11, 2014
• Publication Date: Mar 1, 2015
• Deposit Date: Mar 8, 2016
• Publicly Available Date: Mar 8, 2016
• Journal: IET Renewable Power Generation
• Electronic ISSN: 1752-1424
• Publisher: Institution of Engineering and Technology (IET)
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 2
• DOI: https://doi.org/10.1049/iet-rpg.2014.0065
• Keywords: renewable energy sources; power grids; invertors; power generation economics; waveform analysis; power markets; decentralised control; distributed power generation; power supply quality; power filters; power generation control; electric potential
• Public URL: https://nottingham-repository.worktribe.com/output/984700
• Publisher URL: http://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2014.0065
• Additional Information: The authors are grateful to FAPESP (proc. 2012/24309-8, 2012/14014-0 and 2013/08545-6), Fundunesp and CNPq (proc. 487471/2012-1 and 554960/2006-0) for the support provided to this research. ; This paper is a postprint of a paper submitted to and accepted for publication in IET Renewable Power Generation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library.