Stand-by power supply on-line device

Abstract

The invention relates to a stand-by power supply on-line device, which comprises two voltage source current converters, and a direct current short bus and a direct current capacitor which are connected between the two voltage source current converters, wherein each voltage source current converter comprises a converter transformer, a converter reactor, a voltage source converter valve and a controller thereof. According to the stand-by power supply on-line device, short circuit fault penetration between a work power supply and a stand-by power supply can be isolated, the online operation mode of the stand-by power supply is realized at the same time, the power interchange between the work power supply and the stand-by power supply is realized, the continuous power supply function in a switch process of the user work power supply and the stand-by power supply is realized, the supply voltage quality is effectively improved, the satisfaction of a user on the voltage quality is improved, and in addition, the stand-by power supply on-line device also has the functions that the bus power factor is improved, the bus voltage waveform is improved, the bus voltage is stabilized, voltage sag is restrained and the like.

Description

technical field [0001] The invention relates to an on-line backup power supply device, in particular to an on-line backup power supply device used in power plants, substations and other users. Background technique [0002] The backup power automatic input device refers to an automatic device that can automatically and quickly switch on the backup power switch after the working power is disconnected due to a fault, and switch the user's power consumption to the backup power supply, so that the user will not have a power failure. [0003] At present, the existing backup power automatic input device includes a backup power switch and its monitoring controller. The dynamic and static contacts of the backup power switch are respectively connected between the working power supply and the backup power supply. When the power switch is tripped, the working power supply loses voltage, and the backup power supply has voltage, its controller immediately closes the backup power switch to...

AI Technical Summary

Problems solved by technology

[0004] However, it has been found in practice that the existing backup power supply device has the following disadvantages: the backup power switch is a mechanical switch, which cannot be operated online, that is, the time for the user to interrupt the power supply during the switching power supply process is at least at the second level, reducing the The power quality of the power supply affects the user's production

[0005] This shows that the above-mentioned existing backup power supply device obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently.

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