UNINTERRUPTIBLE POWER SUPPLY UNIT, CONTROL METHOD THEREFOR, PROGRAM FOR CONTROL, AND UNINTERRUPTIBLE POWER SUPPLY SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an uninterruptible power supply unit capable of simplifying design and attaining high stability of a current balance.

SOLUTION: This unintrruptible power supply unit is connected with another interruptible power supply unit in parallel and supplies AC power to a common load. The unit includes power conversion means (an inverter 10c) for converting DC power into AC power; sinewave generation means (a sinewave generator 10f) for generating a sinewave as an operation reference of the sinewave generation means; drive means (a PWM drive circuit 10d) for driving the power conversion means in response to the sinewave generated by the sinewave generation means; and adjustment means (an instantaneous voltage comparator) for adjusting the sinewave generated by the sinewave generation means, in response to an output voltage of the power conversion means and supplying it to the drive means. The adjustment means adjusts the sinewave in reference to an output current of the power conversion means.

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