Power converters design and experimental verification for electromagnetic contactors to reduce the impact of the voltage sag in the power system

•The power factor of the electromagnetic contactors could be compensated effectively with power converters.•The voltage sag in the energy system leads to contactors' undesirable tripping, which could be prevented with a power supply system operating in a wide voltage input range.•A combination of power converters could potentially stabilise and improve the operation of the electromagnetic contactor.•The transient turn-on and turn-off processes could be minimised with a contactor coil's voltage variation supplied by the electronic power supply.