Multi-phase voltage regulator control

A control system for a multi-phase power system including a first phase line, a second phase line, and a third phase line, the control system comprising:

• a first tap changer;
• a second tap changer;
• a third tap changer, each of the first tap changer, the second tap changer, and the third tap changer associated with a respective phase line;
• and
• an electronic processor coupled to the first tap changer, the second tap changer, and the third tap changer, the electronic processor configured to,
• determine an average voltage of the multi-phase power system based on a voltage of the first phase line, a voltage of the second phase line, and a voltage of the third phase line;
• determine a voltage regulation command based on the average voltage and a multi-phase setpoint;
• determine whether the first tap changer, the second tap changer, and the third tap changer are set to a same tap position;
• issue the voltage regulation command when the first tap changer, the second tap changer, and the third tap changer are at the same tap position.

A control system for a multi-phase power system including a first phase line, a second phase line, and a third phase line, the control system comprising:

• a first tap changer;
• a second tap changer;
• a third tap changer, each of the first tap changer, the second tap changer, and the third tap changer associated with a respective phase line;
• and
• an electronic processor coupled to the first tap changer, the second tap changer, and the third tap changer, the electronic processor configured to,
• determine whether each of a voltage of the first phase line, a voltage of the second phase line, and a voltage of the third phase line are within band of a target bandcenter;
• perform a voltage regulation operation when one or more of the voltages of the first phase line, the second phase line, and the third phase line are out of band of the target bandcenter;
• and
• adjust a tap position of the tap changer associated with the phase line having a voltage furthest from the bandcenter.