Control device for uninterruptible power supply apparatus

Abstract

The present invention provides a control device for an uninterruptible power supply apparatus. When the current failure state of an AC power supply (1) is releases, an information that the AC power supply (1) is in a normal state is notarized, a synchronization control is performed for making the uninterruptible power supply apparatus (20) to generate an output voltage synchronous with the voltage of the AC power supply (1), in a state that the difference of the frequency of the AC power supply (1) be about to start and the output frequency of the uninterruptible power supply apparatus (20) is big, a synchronization control through a path of a phase difference / frequency detection circuit (21), a setting device (23), an adder(24), a limiting circuit (25), a setting device (26), a multiplier (27), an adder (28), a contact point (22b), an LPF (29), an adder (30), a V / F converter (16), and an inverter driving circuit (17). In the synchronization control of the path, the output voltage of an inverter circuit (12) and the voltage of the AC power supply (1) can be synchronized quickly without any impacts.

Description

technical field [0001] The invention relates to a control device of an uninterruptible power supply device which generates an output voltage synchronous with the voltage of the AC power supply and supplies power to loads when the external AC power supply is normal. Background technique [0002] figure 2 It is a circuit configuration diagram showing an example of the prior art of such an uninterruptible power supply device. [0003] In this figure, symbol 1 is an AC power source such as a commercial power supply, symbol 2 is a switch (contactor) that connects / disconnects the direct transmission circuit from AC power source 1 to load 3, and symbol 10 is a contactor that is generated when AC power source 1 is normal. An uninterruptible power supply device that outputs voltage synchronously with the voltage of the AC power supply 1 and supplies power to the load 3 . [0004] In this uninterruptible power supply device 10, there are provided a DC power supply 11 forming its mai...

AI Technical Summary

Problems solved by technology

In the state where the difference between the frequency of the AC power supply 1 immediately before the above-mentioned start and the output frequency of the uninterruptible power supply device 10 is large, due to the control action of the above-mentioned control device of the uninterruptible power supply device 10 immediately after the start, there is an uninterruptible power supply device. The problem that the output frequency of 10 changes rapidly, if the above-mentioned sudden change occurs, an overcurrent flows from the uninterruptible power supply device 10 to the load 3 due to the transformer or reactor (reactor) forming the load 3, and there is a problem with this problem. The problem of damage to the load 3 or the above-mentioned main circuit part of the uninterruptible power supply device 10

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