Methods and apparatus for controlling an inverter

An inverter control system, comprising:

• a power regulator configured to:
• detect an inverter output overload condition by comparing a measured output power to a reference power capacity;
• create an inverter control input configured to change an inverter output frequency, an inverter output voltage, or both, in response to the overload condition, wherein:
• the inverter control input is configured to restore a combination of a real output power of the inverter and a reactive output power of the inverter to within a combined maximum static output power limit;
• and
• the creating the inverter control input comprises calculating, when a real-time reference capacity is equal to or less than the measured output power, a supply error by subtracting the measured output power from the real-time reference capacity;
• and
• adjust, using the inverter control input, an inverter to mitigate the inverter output overload condition;
• and
• a voltage-frequency regulator configured to:
• detect, after the adjusting the inverter output to mitigate the inverter output overload condition, a droop condition comprising at least one of:
• the inverter output voltage being out of band;
• or
• the inverter output frequency being out of band;
• modify the inverter control input to change the inverter output voltage, the inverter output frequency, or both to mitigate the droop condition while maintaining the combination of the real output power of the inverter and the reactive output power of the inverter within the combined maximum static output power limit;
• and
• adjust, using the modified inverter control input, the inverter to mitigate the droop condition.

A non-transitory computer-readable medium storing one or more computer-executable instructions that, when executed by at least one processor of a computing device, cause the computing device to perform a method for controlling an inverter, wherein the method comprises:

• detecting, using a power regulator, an inverter output overload condition by comparing a measured output power to a reference power capacity;
• creating, using the power regulator, an inverter control input configured to change an inverter output frequency, an inverter output voltage, or both, in response to the overload condition, wherein:
• the inverter control input is configured to restore a combination of a real output power of the inverter and a reactive output power of the inverter to within a combined maximum static output power limit;
• and
• the creating the inverter control input comprises calculating, when a real-time reference capacity is equal to or less than the measured output power, a supply error by subtracting the measured output power from the real-time reference capacity;
• adjusting, using the inverter control input, the inverter to mitigate the inverter output overload condition;
• detecting, using a voltage-frequency regulator and after the adjusting the inverter output to mitigate the inverter output overload condition, a droop condition comprising at least one of:
• the inverter output voltage being out of band;
• or
• the inverter output frequency being out of band;
• modifying, using the voltage-frequency regulator, the inverter control input to change the inverter output voltage, the inverter output frequency, or both to mitigate the droop condition while maintaining the combination of the real output power of the inverter and the reactive output power of the inverter within the combined maximum static output power limit;
• and
• adjusting, using the modified inverter control input, the inverter to mitigate the droop condition.