A substation DC bus emergency bypass power supply device

Abstract

The invention provides a direct current bus emergency bypass power supply apparatus for a transformer substation. The direct current bus emergency bypass power supply apparatus comprises a working power supply unit, a detecting unit, a power supply unit, a logic determining unit and an output unit, wherein the working power supply unit is used for obtaining a working voltage from the other side direct current bus; the detecting unit is used for detecting an alternating current input voltage of a charger and the current side direct current bus voltage; the power supply unit is used for obtaining a power supply voltage from a current side storage battery pack; the logic determining unit is used for determining that an apparatus operation starting condition is achieved when the working voltage and the power supply voltage are both greater than zero and when the detecting unit detects that the alternating current input voltage of the charger and the current side direct current bus voltage are both equal to zero, and determining that an apparatus operation quitting condition is achieved when the detecting unit detects that the alternating current input voltage of the charger is greater than zero or the current side direct current bus voltage is greater than zero; and the output unit is used for outputting a matched direct current voltage to the current side direct current bus when the logic determining unit determines that the apparatus operation starting condition is achieved. The direct current bus emergency bypass power supply apparatus provided by the invention can be used for supplying power to the direct current power supply system under emergency conditions of alternating current undervoltage of the full station and open circuit of the storage battery pack.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to an emergency bypass power supply device for a DC bus in a substation. Background technique [0002] Such as figure 1 As shown, the substation DC power supply system in normal operation operates separately for the I and II DC busbars. Each group of chargers is powered by two AC power sources at the same time and outputs DC power for the DC load operation of the whole station. At the same time, the chargers The battery pack is float charged. [0003] When the AC input power of the charger is completely lost, the battery pack will run with the DC load of the whole station at this time. The most important role of the battery pack in the substation is to supply power to the DC loads of the whole station when the whole station loses power, so as to ensure the normality of the protection devices, remote control devices, and communication devices, and to control the fault range. ...

AI Technical Summary

Problems solved by technology

[0004] In summary, the existing DC power supply system has significant defects, and it is necessary to develop a new device that can still supply DC loads for the entire station when the AC power of the entire station is lost and the battery pack is open.

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