Open AccessClosed‐loop control of a single‐stage switched‐boost inverter in modified DC‐interconnected nanogrids
Author(s) -
Maged Nourhan Ahmed,
Ebrahim Essamudin A.,
AbdelRahim Naser,
Bendary Fahmy
Publication year - 2020
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2019.1248
Subject(s) - photovoltaic system , duty cycle , computer science , inverter , voltage , control theory (sociology) , transformer , electronic engineering , engineering , electrical engineering , control (management) , artificial intelligence
Switched‐boost inverter (SBI) is a single‐stage power converter suitable for interfacing between photovoltaic (PV) arrays and loads. Although, it has many advantages such as it's not requiring an expensive complex dead‐time circuitry, yet its duty ratio is limited between 0 and 0.5. This means that it has some difficulties in increasing both the DC‐link output voltage and its AC‐output voltage. So, most researchers proposed it for low‐voltage power applications or using with step‐up transformers. Accordingly, this study contributes towards improving the performance of the SBI for being used in the modified nanogrid within an open energy system. It introduces a novel approach closed‐loop control technique to overcome most of the inverter drawbacks. Also, it enhances both the DC‐link and the transformer‐less rated AC output voltages to a sufficient value suitable for feeding domestic loads. And in the same time, the proposed robust controller utilizes a hysteresis band for balancing between voltage stability and PV‐maximum power achievement. This research also includes a more sophisticated fast‐charging slow‐discharging control strategy for the battery energy management system that depends on a bidirectional buck‐boost converter. Test results ensure the robustness of the proposed controller against sensitivity, nonlinearity, and time‐variant parameters of the overall system.