Systems and methods for reactive power management during low voltage ride through in different grid operating mode

A controller for a generator including an engine and an alternator, the controller comprising:

• a processing circuit configured to:
• detect a fault on a power grid;
• identify a power regulation mode of a generator system from a set of power regulation modes, responsive to detecting the fault, each of the set of power regulation modes associated with a corresponding parameter to control, the generator system including the engine and the alternator of the generator;
• switch the power regulation mode to an offset power regulation mode of the generator system responsive to identifying the power regulation mode;
• adjust a value of a parameter of the generator system from a normal value to an offset value, wherein the parameter is selected based on the offset power regulation mode, wherein the offset value is different for each of the set of power regulation modes;
• maintain the value of the parameter as the offset value for a period of time to regulate an amount of reactive current consumed by the generator system including the engine and the alternator of the generator;
• and
• modify the value of the parameter from the offset value to the normal value, and the power regulation mode from the offset power regulation mode to the identified power regulation mode after the period of time.

A generator system comprising:

• a generator including an engine and an alternator coupled to the engine, the generator configured to supply power to a power grid;
• a voltage regulator configured to regulate a voltage of an output of the generator, a power factor of the output, a reactive power of the output, or an active power of the output to a normal value or an offset value;
• and
• a controller configured to:
• detect a fault on a power grid,
• identify a power regulation mode of the generator system from a set of power regulation modes, responsive to detecting the fault, each of the set of power regulation modes associated with a corresponding parameter to control,
• switch the power regulation mode to an offset power regulation mode of the generator system responsive to identifying the power regulation mode,
• adjust a value of a parameter of the generator system from a normal value to an offset value, wherein the parameter is selected based on the offset power regulation mode, wherein the offset value is different for each of the set of power regulation modes,
• maintain the value of the parameter as the offset value for a period of time to regulate an amount of reactive current consumed by the generator including the en gine and the alternator, and
• modify the value of the parameter from the offset value to the normal value, and the power regulation mode from the offset power regulation mode to the identified power regulation mode after the period of time.