Stand-by power supply automatic switch method for multi-stage series connection power supply network

Abstract

The invention discloses a stand-by power supply automatic switch method for a multi-stage series connection power supply network, wherein the power supply network adopts ring network power supply, and a main power supply mode is that two external power source inlet wires carry left and right buses of a plurality of substations respectively. When a ring network line breaks down or a bus breaks down, a corresponding protective device eliminates fault and sends a switch connection signal through fiber transmission to a protective device of a next stage non switch substation simultaneously where the fault line locates, and sends a starting signal to a bus coupler stand-by power supply automatic switch device where next stage non switch locates. The stand-by power supply automatic switch device detects the starting signal, combined with a self voltage criterion, a remote signal state criterion and the like, determines whether to switch on the stand-by power supply or not simultaneously. Because a stand-by power supply automatic switch of a bus coupler switch of the next stage non switch substation where the fault line locates can not detect the starting signal, the stand-by power supply automatic switch performs no action. According to the invention, a problem that traditional stand-by power supply automatic switch function is lack of selectivity in ring network power supply systemapplication is solved.

Description

technical field [0001] The invention relates to a backup power supply self-switching method for a power system power supply network, in particular to a backup power supply self-switching realization method suitable for rail transit and other multi-stage series power supply networks, and belongs to the technical field of power supply systems. Background technique [0002] The rail transit power supply system has extremely high requirements for power supply security, so when the main power supply of the substation is lost due to a fault, it is necessary to require the backup power supply to be put into operation quickly and reliably. Since the rail transit power supply network generally adopts a multi-level series power supply network, the failure of the upper-level power supply may cause the simultaneous loss of power in the lower-level multi-level substations. According to the conventional configuration, the self-injection device of the backup power supply is generally sol...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a new solution for standby automatic switching, which can solve the problem of relatively disordered operation of standby automatic switching caused by power failure in the original multi-stage series power supply network, and reduce the number of standby automatic switching. operation time while improving its reliability

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