How can crosscurrents be minimized if bus voltage is high and the power factors are different?

Minimizing crosscurrents in situations where bus voltage is high and power factors vary involves managing the voltage levels among the units. When one unit is leading and another is lagging, it can lead to significant crosscurrents as the differing power factors cause unequal contributions to the system.

Lowering the voltage to the lagging unit helps to balance the currents on the bus. By reducing the voltage of the lagging unit, the reactive power contribution of that unit decreases, thereby reducing its influence on the overall current flow. This adjustment helps to bring the reactive power outputs of the units closer in alignment, leading to a more stable and balanced system.

Maintaining the same voltage or increasing the voltage to the leading unit would not address the issue of the lagging unit's impact on the system, potentially exacerbating the crosscurrents. Disconnecting the lag unit can be a more drastic measure but does not provide a method for balancing loads; it simply removes the unit from the system rather than correcting the imbalance in contribution. Thus, lowering the voltage to the lagging unit is the most effective strategy for minimizing crosscurrents in this scenario.