| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an uninterruptible power supply apparatus which is suitable for supplying power to a load while operating uninterruptible power supply units comprising a converter, a storage battery circuit and an inverter in parallel. <P>SOLUTION: The uninterruptible power supply apparatus includes a first uninterruptible power supply unit 12, a second uninterruptible power supply unit 13, a k-th uninterruptible power supply unit 14 and a common operating control unit 17 for collectively controlling the respective operating states of the converter constituting these uninterruptible power supply units. The common operating control unit 17 comprises a setting unit 41, an average computer 42, an adder 43, a voltage regulator 44, a reference sine wave generator 45, a multiplying amplifier 46, an adder 47, a current adjuster 48, a PWM controller 49 and an average computer 50. The input current waveform from an AC power supply 1 is controlled to be a sine wave, and a power factor of a fundamental wave as seen from the AC power supply 1 is controlled to nearly one, thereby attaining standardization of each component of the uninterruptible power supply apparatus and cost reduction in the uninterruptible power supply apparatus on the whole, even in a structure wherein the number of uninterruptible power supply units in parallel operation is different. <P>COPYRIGHT: (C)2010,JPO&INPIT |
