Gain adjustment stage for controlling modular ups systems

A power module configured to be coupled to one or more additional power modules in parallel, the power module comprising:

• an input configured to receive AC power from an AC power source;
• an output configured to provide AC output power to a load;
• a current compensator stage configured to generate a current error signal based on output current of the power module;
• and
• a gain adjustment stage configured to:
• receive a current reference signal and adjust a gain of the received current reference signal based on a measurement of the output current and a desired output current of the corresponding power module to generate a gain-adjusted current reference signal, the gain-adjusted current reference signal being an adjusted signal, and
• adjust the current error signal based on a measurement of the output current and a desired output current of the power module by providing the gain-adjusted current reference signal to an input of the current compensator stage of at least one of the plurality of power modules.

A non-transitory computer readable medium storing instructions for operating at least one power module of a plurality of power modules coupled in parallel, the instructions when executed cause the at least one power module to perform the acts comprising:

• receiving AC power from an AC power source at an input;
• providing AC output power to a load at an output;
• generating a current error signal by a current compensator stage based on output current of the at least one power module;
• receiving a measurement of output current of the at least one power module;
• receiving a current reference signal and adjust a gain of the received current reference signal based on the measurement of the output current and a desired output current of the corresponding power module to generate a gain-adjusted current reference signal, the gain-adjusted current reference signal being an adjusted signal;
• and
• adjusting the current error signal of the corresponding power module, based on the received measurement and a desired output current of the at least one power module, by providing the gain-adjusted current reference signal to an input of the current compensator stage of the at least one power module.