Automatic putting method for multi-power-supply standby power supply

Abstract

The invention provides an automatic putting method for a multi-power-supply standby power supply. The method comprises the following steps: initializing standby putting priorities of a first standby power supply branch and a second standby power supply branch; when a section switch is closed, a first switch or a third switch is closed and a second switch and a fourth switch are disconnected, judging whether a first power supply bus and a second power supply bus lose voltage or not, and if yes, continuing to judge whether a first common power supply branch or a second common power supply branch loses voltage or not; and if the first common power supply branch or the second common power supply branch loses voltage, switching off the first switch and the third switch, and switching on a switch, connected with the bus, of the standby power supply branch with the higher priority according to the initialized standby input priority. According to the invention, after the two buses suffer from the voltage loss, the power supply branch circuit causing the voltage loss of the buses is firstly found, and then switched to the corresponding standby power supply branch circuit, so that a stable and reliable standby power supply automatic putting method can be provided for a multi-power supply high-voltage equipment power supply loop.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method for automatically switching on a multi-power backup power supply. Background technique [0002] In recent years, in the power grid, especially in the power grid that supplies power to industrial parks with large power consumption, multiple power sources are widely used for power supply. The commonly used power supply line structure is the structure of two common power supply branches and two backup power supply branches. In this power supply line structure, the input ends of the two common power supply branches are often connected to the same The upper-level busbar supplies power to the load branch through the same lower-level busbar, and the input terminals of the two backup power supply branches are often connected to the upper-level busbar near the two power supply busbars, which are often not the same upper-level busbar, so as to facilitate the layout of tr...

AI Technical Summary

Problems solved by technology

There is a high probability that two common power supply branch lines fail at the same time and the dual-circuit line is shut down at the same time during maintenance. Therefore, the power supply reliability of the electrical equipment connected to the output end of the load branch circuit is poor, and it is impossible to continuously supply power to industrial parks or industrial enterprises.

In addition, since the input ends of the two backup power branches are connected to different upper-level buses, the relevant parameters of different upper-level buses are not exactly the same, so the output ends of the two backup power branches are connected to two power supply buses at the same time. In some cases, the two power supply busbars cannot be connected to avoid failure, which will cause the backup power supply to be put into the power supply circuit to be prone to failure, resulting in a decrease in the stability of the entire multi-channel power supply circuit, and even a greater safety hazard

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