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

Fernando Pinhabel Marafão; Danilo Iglesias Brandão; Alessandro Costabeber; Helmo Kelis Morales Paredes

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

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Author(s): Fernando Pinhabel Marafão ¹ ; Danilo Iglesias Brandão ² ; Alessandro Costabeber ³ ; Helmo Kelis Morales Paredes ¹
- Affiliations: 1: Group of Automation and Integrated Systems, UNESP–Universidade Estadual Paulista, Av. Três de Março 511, Sorocaba, SP, Brazil;
  2: Department of System and Energy, University of Campinas, Av. Albert Eintein 400, Campinas, SP, Brazil;
  3: Department of Electrical and Electronic Engineering, University of Nottingham, NG7 2RD, Nottingham, NG, UK
Source: Volume 9, Issue 2, March 2015, p. 154 – 165
DOI: 10.1049/iet-rpg.2014.0065 , Print ISSN 1752-1416, Online ISSN 1752-1424

Received 16/02/2014, Accepted 30/06/2014, Revised 19/05/2014, Published 11/09/2014

ln recent years, the concept of decentralising power generation through the deployment of distributed generators (DGs) has been widely accepted and applied, driven by the growing market of renewable energy sources. These DGs are normally equipped with a switching power interface, acting as front end with the grid. This paper proposes a multi-task control strategy for distributed generation systems that simultaneously allows the DG 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. 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.

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

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