This paper demonstrates a novel hybrid multilevel inverter configuration for uninterruptible power supply, indicating improved voltage balance and efficiency.
This paper presents an efficient hybrid multilevel inverter topology for three‐phase uninterruptible power supply systems. This hybrid topology combines a T‐type neutral point clamped (TNPC) inverter and an H‐bridge inverter with quaternary asymmetry. This configuration can offer high‐resolution output line‐to‐line voltage using an optimized number of devices. The TNPC inverter's low‐loss characteristics are further enhanced by operating it at near fundamental frequency. The modulation strategy is customized to manage with limited computational resources. Additionally, an optimized battery bank arrangement with a low VA unidirectional high‐frequency link is proposed to ensure voltage asymmetry and balanced operation. Loss analysis of the converter is performed in PLECS. Simulation results obtained from MATLAB/Simulink are validated through experimental testing, showing strong agreement with the simulations.
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Ansari et al. (2025) studied this question.
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