Uninterruptible power supply device

An uninterruptible power supply device (UPS) configured to provide a designed electrical power to an electrical load, comprising:

• a rectifier module electrically coupled to an electrical power grid;
• an inverter module electrically coupled to the rectifier module and configured to provide the designed electrical power to the load;
• a battery converter module electrically coupled to the rectifier module and the inverter module, the battery converter module being configured to receive electrical power from the rectifier module and to provide electrical power to the inverter module;
• a control unit configured to detect a measured grid frequency of the electrical power grid;
• wherein the rectifier module is configured to receive electrical power from the electrical power grid;
• and to provide electrical power to the electrical power grid;
• and
• wherein the rectifier module is arranged to process a higher amount of electric power as the designed electrical power provided by the inverter module to enable the uninterruptible power supply device to provide stabilization support to the electrical power grid;
• wherein the rectifier module comprises at least two rectifier submodules, each of the at least two rectifier submodules being dimensioned to process an amount of electrical power according to a capability of the inverter module to process power;
• and
• electrically coupling by the rectifier module, in response to the amount of electrical power exceeding the capability of the inverter module and the control unit detecting a frequency of the electrical power grid being outside a nominal frequency for the electrical power grid, the rectifier submodules selectably to process a higher amount of electric power as the inverter module to provide stabilization support to the electrical power grid by activating or deactivating at least one of the at least two rectifier submodules during full operation of the uninterruptible power supply device to expand the capability of the rectifier module to process the amount of electrical power.