UPS with source impedance compensation

An offline uninterrupted power supply for providing power to a load in case of failure of a power source, the uninterrupted power supply comprising:

• at least one disconnect switch, which is arranged between the power source and the load,
• at least one energy storage,
• at least one power converter, which is arranged between the at least one energy storage and the load at a load side of the disconnect switch,
• and a control device for controlling the at least one power converter to provide power from the at least one energy storage to the load in case of failure of the power source,
• wherein the control device is adapted to perform the following:
• identify a power quality event,
• differentiate the identified power quality events to separate load side events from power supply side quality events,
• upon identification of a power supply side power quality event from an identified power quality event, provide power from the at least one energy storage to the load, and
• perform network impedance compensation in respect to the load, and
• wherein the step of differentiating the power quality events to separate load side events from power supply side quality events comprises using network impedance compensated utility voltage and load current.

An offline uninterrupted power supply control device for operation an offline uninterrupted power supply including at least one disconnect switch, which is arranged between the power source and the load, at least one energy storage, at least one power converter, which is arranged between the at least one energy storage and the load at a load side of the disconnect switch, the control device comprising:

• a set of instructions that when executed are structured so as to:
• identify a power quality event,
• differentiate the identified power quality events to separate load side events from power supply side quality events,
• upon identification of a power supply side power quality event from an identified power quality event, provide power from the at least one energy storage to the load by operating the power converter, and
• perform network impedance compensation in respect to the load, and
• wherein the step of differentiating the power quality events to separate load side events from power supply side quality events comprises using network impedance compensated utility voltage and load current.