Voltage fluctuation suppressing device for alternating current generator

A voltage fluctuation suppressing device for an alternating current generator provided in the alternating current generator and configured to suppress voltage fluctuation by excitation control based on an output voltage, the alternating current generator comprising a plurality of output terminals including at least one of three-phase output terminals and single phase output terminals, and the voltage fluctuation suppressing device comprising:

• a processor;
• and
• a memory configured to be able to communicate with the processor, the processor being configured to:
• detect a load current of each of the plurality of output terminals;
• identify an in-use output terminals based on the detection of the load current;
• detect inter-terminal voltages between the identified terminal and other terminals included in the three-phase output terminals when the identified output terminal is included in the three-phase output terminals and detect an inter-terminal voltage of the single phase output terminals when the identified output terminal is included in the single phase output terminals;
• and
• control excitation by using an output voltage calculated from the detected inter-terminal voltages of the three-phase output terminals and/or the detected inter-terminal voltage of the single phase output terminals to calculate the output voltage;
• and
• control the execution by using the calculated output voltage, wherein when the three-phase output terminals and single phase output terminals are in-use output terminals, the processor is further configured to calculate the output voltage such that an average value of the inter-terminal voltages of the three-phase output terminals is calculated as a first average value, and an average value obtained by averaging the inter-terminal voltage of the single phase output terminals and the first average value is calculated as a second average value which is the output voltage.