Voltage stabilizing system for input end of underground uninterruptible power supply

Abstract

A voltage stabilizing system for an input end of an underground uninterruptible power supply comprises a voltage stabilizing device, a control device and a charging inversion device, the voltage stabilizing device comprises an alternating current input end, a multi-input-output tapped transformer and an alternating current output end, the alternating current input end is connected with a winding input end of the transformer and the control device, a primary relay is respectively arranged between the alternating current input end and a plurality of input taps of the winding input end, and the alternating current output end is connected with the winding output end of the transformer, the control device and the charging inversion device. Secondary relays are respectively arranged between the alternating current output end and the plurality of output taps of the winding output end, and the primary relays and the secondary relays are connected with the control device. According to the invention, the output stability is improved, the voltage regulation range is expanded, meanwhile, surge voltage generated when the transformer switches gears is not easy to be transmitted into the charging inversion device to cause abnormal operation of the charging inversion device, and the service life of the charging inversion device is prolonged.

Description

technical field [0001] The invention belongs to the technical field of power grids, and in particular relates to a downhole uninterruptible power supply input terminal voltage stabilization system. Background technique [0002] With the construction and development of national intelligent mines, the requirements for the quality of underground power supply in coal mines are becoming more and more stringent, and some key electrical equipment requires the use of uninterruptible power supply (hereinafter referred to as UPS). [0003] Such as figure 2 As shown, the conventional interactive UPS mainly uses the inverter main board to directly control the relay on the output side of the transformer to select the output gear of the transformer and realize the stability of the output voltage. Since the inverter main board directly controls the relay, on the one hand, the transformer will switch gears. The surge voltage of the inverter is easily transmitted to the main board of the in...

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Problems solved by technology

[0003] like figure 2 As shown, the conventional interactive UPS mainly uses the inverter main board to directly control the relay on the output side of the transformer to select the output gear of the transformer and realize the stability of the output voltage. Since the inverter main board directly controls the relay, on the one hand, the transformer will switch gears. The surge voltage of the inverter is easily transmitted to the main board of the inverter, causing it to work abnormally. On the other hand, it also increases the working time of the main board of the inverter and reduces its service life.

[0004]In addition, due to the large fluctuation range of the underground power load, the fluctuation range of the underground power supply voltage is large, so a larger voltage adjustment range is also required

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