Performance Comparison of a Typical Nonlinear Load Connected to Ac and Dc Power Grids
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.
KeywordsDc grids Dc smart homes Nonlinear loads Efficiency
This work has been supported by COMPETE: POCI-01-0145–FEDER–007043 and FCT – Fundação para a Ciência e Tecnologia within the Project Scope: UID/CEC/00319/2013. This work is financed by the ERDF – European Regional Development Fund through the Operational Programme for Competitiveness and Internationalisation – COMPETE 2020 Programme, and by National Funds through the Portuguese funding agency, FCT – Fundação para a Ciência e a Tecnologia, within project SAICTPAC/0004/2015 – POCI – 01–0145–FEDER–016434. Mr. Tiago Sousa is supported by the doctoral scholarship SFRH/BD/134353/2017 granted by the Portuguese FCT agency.
- 18.Baek, S.-M., Kim, H.-J., Cho, J.-W., Ryoo, H.-S.: Cryogenic electrical insulation characteristics of solid insulator for the HVDC HTS cable. IEEE Trans. Appl. Supercond. 28(4), 1–4 (2018)Google Scholar
- 25.IEEE Standards Association: IEEE recommended practice and requirements for harmonic control in electric power systems. In: IEEE Std 519-2014 (Revision of IEEE Std 519-1992), vol. 2014, pp. 1–29 (2014)Google Scholar
- 27.Goncalves, W.K.A., De Oliveira, J.C., Franco, V.L.S.: Harmonics produced by advanced static VAr compensator under electric power supply conditions with loss of quality. In: Proceedings of International Conference on Electric Utility Deregulation and Restructuring and Power Technologies, pp. 660–665 (2000)Google Scholar
- 28.Blanco, A.M., Stiegler, R., Meyer, J.: Power quality disturbances caused by modern lighting equipment (CFL and LED). In: 2013 IEEE Grenoble Conference, pp. 1–6 (2013)Google Scholar
- 29.Dugan, R.C., McGranaghan, M.F., Beaty, H.W., Santoso, S.: Electrical Power Systems Quality, 3rd edn. McGraw-Hill, New York (2004)Google Scholar
- 31.Taylor, G.A.: Power quality hardware solutions for distribution systems: custom power. In: IEEE North Eastern Centre Power Section Symposium on the Reliability, Security and Power Quality of Distribution Systems, vol. 1995, pp. 1–9 (1995)Google Scholar
- 40.Ghazanfari, A., Mohamed, Y.A.-R.I.: Decentralized cooperative control for smart DC home with DC fault handling Capability. IEEE Trans. Smart Grid 9(5), 1 (2017)Google Scholar