How are cross currents between parallel generators minimized if the bus voltage is low and the power factors are different?

The reasoning behind raising the voltage to the lead unit as the correct action to minimize cross currents between parallel generators involves understanding the concept of voltage regulation and power factor relationships in parallel operation.

When generators operate in parallel, they need to maintain synchronization while sharing the load effectively. If the bus voltage is low and the generators have different power factors, the leading unit (which is typically operating at a higher power factor) will attempt to supply power more efficiently than the lagging unit. If the lagging unit has a lower voltage, it may not be able to provide its share of the load effectively, leading to potential instability in the system and unwanted circulating currents between the generators.

By raising the voltage of the lead unit, the voltage difference between the generators is minimized, allowing for better voltage matching. This adjustment helps manage the load sharing based on their respective power factors, reducing the impact of cross currents that arise from unequal power factor conditions. A more balanced voltage leads to improved system stability and performance, ensuring that both units contribute appropriately to the overall load.

Other options, such as disconnecting a unit or adjusting load distribution, do not directly address the issue of voltage mismatch and cross currents as effectively as raising the lead unit's voltage does within the context of synchronizing