| 摘要 |
An uninterruptible power supply includes a first converter connected in parallel with an AC power system, a second converter series-connected to the first converter, and an energy accumulation device connected between the first and second converters. A control apparatus controls the first converter and the second converter so that when the voltage of the AC power system is within a first voltage range, the second converter switches at a frequency of the AC power system and the system voltage is output via the second converter. When the system voltage is within a second voltage range, outside the first voltage range, the second converter is used to compensate the voltage of the AC power system to output a reference voltage value, and when the system voltage is outside the second voltage range, the energy accumulation means and the second converter are used to generate and output the reference voltage value.
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