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International Research Journal of Engineering and Technology (IRJET) Volume: 13 Issue: 01 | Jan 2026

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e-ISSN: 2395-0056 p-ISSN: 2395-0072

HYBRID DC-AC CONVERTER FOR RELIABLE OFF-GRID SOLAR POWER SUPPLY Parvathi Naveen1, Annamalla Akshay2, Banothu Ramesh Nayak3, Ashiwya Anjum4, GP Merline5. 1,2,3,4UG Scholar, Department of Electrical and Electronics Engineering, Holy Mary Institute of Technology and

Science, Hyderabad, Telangana, India. 5Assistant Professor, Department of Electrical and Electronics Engineering, Holy Mary Institute of Technology and

Science, Hyderabad, Telangana, India. --------------------------------------------------------------------------***----------------------------------------------------------------------Abstract Off-grid solar photovoltaic (PV) systems are increasingly used in remote and rural areas to provide uninterrupted power where grid access is unavailable or unreliable. A critical component of these systems is the DC-AC converter, also known as the inverter, which converts the DC output from PV panels and battery storage into usable AC electricity for end-use loads. Hybrid DC-AC converters, which combine multiple power conversion strategies and advanced control algorithms, have emerged as a promising solution to enhance reliability, efficiency, and power quality in off-grid solar applications. This review article examines the state of research on hybrid converters, exploring various topologies, control methods, and reliability considerations. Through a detailed analysis of ten key studies, we identify current trends, performance improvements, and challenges in deploying hybrid DC-AC converters for reliable off-grid solar power supply.

Keywords Hybrid DC-AC converter, Off-grid solar power, Inverter reliability, Power quality, MPPT control, Renewable energy systems, Photovoltaic converter, Microgrid, Advanced control strategies.

Literature Review 1.

Converter Topologies for Renewable Power Systems: Afshari et al. provide a comprehensive classification of hybrid converter topologies used in PV systems, categorizing them into isolated and non-isolated configurations. The study highlights that most commercial hybrid inverters utilize a combination of a DC-DC boost converter for maximum power point tracking (MPPT) and a voltage source inverter (VSI) for DC-AC conversion. Hybrid topologies are advantageous due to enhanced flexibility, improved voltage regulation, and efficient battery integration. The paper also emphasizes that hybrid converters must balance simplicity and efficiency while accommodating various battery input ranges, indicating that design choices directly impact system performance and reliability.

Performance and Control of Current Source Inverters (CSI) in PV Systems: The role of CSIs in renewable energy systems is examined with a focus on efficiency and reliability. CSIs demonstrate high conversion efficiency and stability features, which contribute significantly to PV system performance. However, CSIs tend to exhibit lower power quality under variable load conditions compared to VSIs, and present challenges such as susceptibility to open-circuit faults. This suggests that hybrid designs incorporating both CSI and VSI components, along with robust control mechanisms, can provide improved reliability and power quality in off-grid solar systems.

Reliability of PV Converters with Hybrid Power Control: Research on hybrid control strategies, such as combining MPPT with power reserve control (PRC), shows that hybrid power control can reduce thermal stress on power semiconductor devices and thereby increase overall converter lifespan. The authors conducted a reliability evaluation using mission profile analysis, finding that hybrid control methods can enhance device longevity and performance under real operating conditions. These results are particularly relevant for off-grid applications where maintainability and lifespan are critical.

Hybrid Switching Control Based DC-AC Inverter for Renewable Microgrids: A hybrid switching control technique combining pulse-width modulation (PWM) with hysteresis current control has been proposed to stabilize DC-AC inverters for microgrid applications. The inclusion of an LCL filter in the converter design effectively reduces total harmonic distortion (THD), improving the quality of the AC output waveform. This hybrid control approach demonstrates how multi-strategy switching can enhance inverter performance in renewable energy systems, which is vital for ensuring reliable power in off-grid solar installations.

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