Enhancing Energy Power Quality in Low-Voltage Networks Integrating Renewable Energy Generation: A Case Study in a Microgrid Laboratory

Edisson Villa-Ávila, Paul Arévalo, Roque Aguado, Danny Ochoa-Correa, Vinicio Iñiguez-Morán, Francisco Jurado () and Marcos Tostado-Véliz ()
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Edisson Villa-Ávila: Department of Electrical, Electronics and Telecommunications Engineering (DEET), University of Cuenca, Balzay Campus, Cuenca 010107, Ecuador
Paul Arévalo: Department of Electrical Engineering, University of Jaén, 23700 Linares, Spain
Roque Aguado: Department of Electrical Engineering, University of Jaén, 23700 Linares, Spain
Danny Ochoa-Correa: Department of Electrical, Electronics and Telecommunications Engineering (DEET), University of Cuenca, Balzay Campus, Cuenca 010107, Ecuador
Vinicio Iñiguez-Morán: Department of Electrical, Electronics and Telecommunications Engineering (DEET), University of Cuenca, Balzay Campus, Cuenca 010107, Ecuador
Francisco Jurado: Department of Electrical Engineering, University of Jaén, 23700 Linares, Spain
Marcos Tostado-Véliz: Department of Electrical Engineering, University of Jaén, 23700 Linares, Spain

Energies, 2023, vol. 16, issue 14, 1-23

Abstract: Nowadays, energy decarbonization due to integrating renewable energy sources presents important challenges to overcome. The intermittent nature of photovoltaic systems reduces power quality by producing voltage variations and frequency deviations in electrical system networks, especially in weak and isolated distribution systems in developing countries. This paper presents a power smoothing method for improving the low-pass filter and moving average for grid-connected photovoltaic systems. This novel method includes state-of-charge monitoring control of the supercapacitor’s energy storage system to reduce the fluctuations of photovoltaic power at the point of common coupling. A case study for a microgrid in a high-altitude city in Ecuador is presented with exhaustive laboratory tests using real data. This research aims to improve energy power quality in electrical distribution systems to cope with the growth of renewable penetration. The results demonstrate significant power quality and stability improvements achieved through the proposed method. For instance, the power smoothing method effectively reduced power fluctuations by 16.7% with the low-pass filter, 14.05% with the ramp-rate filter, and 9.7% with the moving average filter.

Keywords: power smoothing; photovoltaic generation system; low-pass filter; moving average; monitoring control; microgrid (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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