A Single-Phase Common-Ground Buck – Boost Inverter
Corressponding author's email:
tridd@hcmute.edu.vnDOI:
https://doi.org/10.54644/jte.2025.1660Keywords:
Common ground, H-bridge, DC-AC converter, CMV eliminate, Leakage currentAbstract
This paper presents a new single-phase inverter topology capable of eliminating common-mode voltage (CMV) called the Single-Phase Common Ground Boost/Buck-Boost Inverter (1P-CG-BBI), which aims to overcome the limitations of traditional common ground systems. The PWM algorithm is specifically designed to switch the devices for both DC-DC and DC-AC operations without interfering with each other, with the goal of enhancing voltage regulation and improving energy conversion efficiency. In this topology, a proportional integral (PI) controller is designed to adjust the DC voltage from the Boost/Buck-Boost circuit and the AC voltage from the inverter circuit. By analyzing small signals and optimizing the controller parameters, the system achieves high stability and quick response to load changes. Compared to traditional control topologies, the application of PI in the 1P-CG-BBI topology not only enhances control capabilities but also minimizes energy losses, thereby improving the overall efficiency of the system. The simulation and experimental results in this paper demonstrate the stability and ability to adjust voltage values in both DC-DC and DC-AC operations enabled by the PI controller.
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