[Objective] The integration of high-penetration photovoltaics and high-power electric vehicles has altered the operating characteristics of power systems

resulting in frequent wide-range voltage fluctuations. This imposes stricter requirements on the voltage regulation speed

range

and capacity of distribution transformers. Traditional distribution transformers

limited by the high-voltage side

exhibit small tap steps and slow voltage regulation speeds

making wide-range voltage regulation impossible. To address this issue

this study proposes a novel hybrid wide-range voltage regulation method on low-voltage side based on active inversion

which connects the tap changer to the low-voltage side of the distribution transformer to achieve wide-range voltage regulation. [Methods] To address the challenges of high switching currents and large conduction losses on the low-voltage side

an inverter power source was incorporated into the power electronic commutation branch. A voltage-current dual-loop competition strategy was employed to regulate the control signals of the inverter circuit

offsetting the forward voltage of electronic components and enabling zero voltage across the mechanical branch. Meanwhile

the inverter circuit was activated to generate load current

forcing current commutation from the mechanical branch to the power electronic commutation branch

thus achieving zero current in the mechanical branch. This ensured true zero-voltage and zero-current operation of the mechanical switch

solving the problem of incomplete arc extinction in traditional hybrid switches. [Results] The simulation results showed that the inverter power supply provided zero-voltage and zero-current conditions for the mechanical switch

enabling arc-free operation. Compared to traditional hybrid switches

the proposed novel hybrid wide-range voltage regulation method on the low-voltage side reduced the voltage regulation time by at least four times. Moreover

it generated significantly lower arc energy during switching. After 300 000 switching operations

the mechanical contacts had a remaining service life index of 97.2%

demonstrating relatively long service life

while traditional hybrid switches exhibited a service life index of only 37.9%. [Conclusion] The proposed novel hybrid wide-range voltage regulation method on the low-voltage side achieves rapid

wide-range

and low-loss voltage regulation.