Green Energy and Networking. 5th EAI International Conference, GreeNets 2018, Guimarães, Portugal, November 21–23, 2018, Proceedings

Research Article

Performance Comparison of a Typical Nonlinear Load Connected to Ac and Dc Power Grids

  • @INPROCEEDINGS{10.1007/978-3-030-12950-7_5,
        author={Tiago Sousa and V\^{\i}tor Monteiro and J. Pinto and Jo\"{a}o Afonso},
        title={Performance Comparison of a Typical Nonlinear Load Connected to Ac and Dc Power Grids},
        proceedings={Green Energy and Networking. 5th EAI International Conference, GreeNets 2018, Guimar\"{a}es, Portugal, November 21--23, 2018, Proceedings},
        proceedings_a={GREENETS},
        year={2019},
        month={2},
        keywords={Dc grids Dc smart homes Nonlinear loads Efficiency},
        doi={10.1007/978-3-030-12950-7_5}
    }
    
  • Tiago Sousa
    Vítor Monteiro
    J. Pinto
    João Afonso
    Year: 2019
    Performance Comparison of a Typical Nonlinear Load Connected to Ac and Dc Power Grids
    GREENETS
    Springer
    DOI: 10.1007/978-3-030-12950-7_5
Tiago Sousa1,*, Vítor Monteiro1, J. Pinto1, João Afonso1
  • 1: University of Minho
*Contact email: tsousa@dei.uminho.pt

Abstract

This paper presents a performance comparison of a typical nonlinear load used in domestic appliances (electronic load), when supplied by an ac and a dc voltage of the same rms value. The performance of the nonlinear load towards its connection to ac and dc power grids is accomplished in terms of the waveforms which are registered in the consumed current, internal dc-link voltage and output voltage. A simulation model was developed using realistic database models of the power semiconductors comprising a nonlinear load with input ac-dc converter, so that the efficiency can be calculated and compared for three distinct cases: (1) load supplied by an ac voltage; (2) load supplied by a dc voltage; (3) load without the input ac-dc converter supplied by a dc voltage. Thus, besides the comparison between the ac and dc power grids supplying the same nonlinear load (cases 1 and 2), a third case is considered, which consists of removing the input ac-dc converter (eliminating needless components of the nonlinear load when supplied by a dc voltage). The obtained results show that supplying nonlinear loads with dc power grids is advantageous in relation to the ac power grid, and therefore it can be beneficial to adapt nonlinear loads to be powered by dc power grids.