Open AccessOptimal power dispatch in solar‐assisted uninterruptible power supply systems
Author(s) -
Siraj Kiran,
Awais Muhammad,
Khan Hassan A.,
Zafar Ahmad,
Hussain Arif,
Zaffar Nauman A.,
Jaffery Syed Husain Imran
Publication year - 2020
Publication title -
international transactions on electrical energy systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 42
ISSN - 2050-7038
DOI - 10.1002/2050-7038.12157
Subject(s) - photovoltaic system , retrofitting , uninterruptible power supply , electric power system , reliability engineering , grid , maximum power point tracking , grid connected photovoltaic power system , solar power , engineering , computer science , automotive engineering , power (physics) , electrical engineering , voltage , mathematics , physics , quantum mechanics , geometry , structural engineering , inverter
Summary Many countries in the developing world undergo regular power outages (scheduled and nonscheduled) due to lack of sufficient generation capability or transmission and distribution bottlenecks. Therefore, uninterruptible power supply (UPS) systems are commonly installed to critical power loads during daily power outages. While the integration of solar photovoltaic (PV) with these UPSs has seen rapid growth in recent years, their incorporation in conventional topologies is highly suboptimal. Therefore, in this work, we formulate a mathematical framework for optimal solar PV integration with domestic UPS systems for minimum cost solution incorporating all relevant system constraints and requisite system losses. We also propose and develop a retrofitting technological solution to integrate solar PV with typical UPS systems for optimal system operation. Results show that the proposed methodology and system implementation can achieve cost savings of up to 40.6% compared with conventional UPS system (without solar) in typical scenarios. In addition, with the proposed optimized utilization of PV, the grid utilization is decreased by 75% compared with the conventional case where UPS is integrated with solar using standard maximum power point charge controllers. This work is therefore highly useful for many developing regions with intermittent grids.