Substation based high voltage uninterruptible power supply

A higher power uninterruptible power supply comprising:

• an isolation transformer that comprises:
• a primary winding that receives a first alternating current voltage;
• and
• a secondary winding that generates a second alternating current voltage;
• a rectifier coupled to the secondary winding that converts the secondary alternating current voltage to a direct current voltage that is provided to a primary direct current bus;
• an inverter having an input coupled to the primary direct current bus that converts the direct current voltage to a third alternating current voltage that is coupled to an output of the high power uninterruptible power supply;
• a back-up power source coupled to the primary direct current bus;
• and
• a partially rated reference transformer that is electrically coupled in parallel with the output of the high power uninterruptible power supply and that is configured to provide at least one of a neutral reference and a ground reference;
• wherein the UPS has a rating of at least one MVA.