Compensation of reactive power and hybrid operation in the systems of uninterruptible power supply (UPS)

The paper presents analysis of possible compensation of reactive power by internal in¬put blocks of Uninterruptible Power Systems (UPS), without the use of additional power electronic converters or stationary passive elements (on the example of UPS EVER POWERLINE GREEN 33). Moreover, the consideration related to additional UPS functionality consisting in hybrid operation, enabling longer duration of supply maintenance within a definite region of the mains voltage variations. The results of measurements and calculations are presented, that have been carried out in a given physical system. Final part of the paper includes a summary of the obtained results.