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 plurality of regulator controls including,
• a first regulator control configured to control a first tap changer associated with the first phase line;
• a second regulator control configured to control a second tap changer associated with the second phase line;
• a third regulator control configured to control a third tap changer associated with the third phase line;
• an electronic processor coupled to the first regulator control, the second regulator control, and the third regulator control, 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 voltage of the first 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 to each of the first, second, and third regulator controls 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 plurality of regulator controls including,
• a first regulator control configured to control a first tap changer associated with the first phase line;
• a second regulator control configured to control a second tap changer associated with the second phase line;
• a third regulator control configured to control a third tap changer associated with the third phase line;
• and
• an electronic processor coupled to the first regulator control, the second regulator control, and the third regulator control, 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 first 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;
• determine whether any of the voltages of the first phase line, the second phase line, and the third phase line differ from the target bandcenter by more than a threshold;
• and
• adjust a tap position of the tap changer associated with the phase line having a voltage furthest from the bandcenter when of the voltages of the first phase line, the second phase line, and the third phase line differ from the target bandcenter by more than the threshold.