A Thai team developed hardware-specific finite-control-set model predictive control for a transformerless CSI7 photovoltaic inverter. It combines dynamic DC-current tracking, overlap-time commutation and direct penalisation of common-mode-voltage variation. Hardware-in-the-loop and physical tests report lower THD and leakage current than conventional controls, although the abstract provides no effect sizes or long-duration evidence.
Key findings
- The controller adapted to changing DC current, suppressed ripple and enabled a smaller DC inductor. Commutation avoided high-frequency resonance while retaining zero-current switching, and common-mode-voltage control targeted leakage-current generation. Tests reported improved robustness, THD and leakage mitigation, but the abstract gives no numerical effect sizes.
Why this matters globally
A transformerless inverter that can use a smaller inductor while controlling power quality and leakage may reduce size, cost and losses in grid-tied PV, provided it passes safety and grid-code testing across operating conditions.
Thai researcher contribution
Jonggrist Jongudomkarn, Natthachai Chaiyakham and Pirat Khunkitti of Khon Kaen University, together with Apirat Siritaratiwat of KMITL, form the Thai research team behind this power-control study.
Limitations to consider
The abstract omits rated power, numerical THD, leakage, efficiency and comparative statistics. HIL and prototype tests do not establish lifetime reliability, grid-fault behaviour, thermal performance, EMI or standards compliance, and cost-function weights may require retuning for other hardware.