Two-section direct-current power supply bus open-circuit protection system with step-down silicon chain

Abstract

The invention discloses a two-section direct-current power supply bus open-circuit protection system with a voltage reduction silicon chain. The system comprises a first-section direct-current power bus, a second-section direct-current power bus and a step-down silicon chain open-circuit protection bidirectional DC / DC device, the step-down silicon chain open circuit protection bidirectional DC / DCdevice comprises a monitoring unit, a bidirectional DC converter and a control unit. The output end of the monitoring unit is electrically connected with the input end of a control unit, the output end of the control unit is electrically connected with a bidirectional direct-current converter, and the bidirectional direct-current converter is connected between the first section of direct-current power bus and the second section of direct-current power bus in a bridging mode. The bidirectional direct-current converter is novel in structure and ingenious in conception, the bidirectional direct-current converter is started immediately and supplies power to the fault section bus when power supply of the control bus is abnormal due to open circuit of a voltage reduction silicon chain of a certain section of direct-current bus, so that power supply continuity of the direct-current bus is guaranteed, and the purpose of mutual spare power automatic switching uninterrupted power supply of two sections of direct-current power buses is achieved.

Description

technical field [0001] The invention relates to the technical field of direct current power supply systems, in particular to a novel two-stage direct current power supply bus with step-down silicon link open-circuit protection system. Background technique [0002] In order to ensure the safe operation of the power system, the control and protection equipment of power plants and substations are powered by DC power. At present, in the DC power supply system with dual charging, dual electricity and dual buses, the two sections of DC power buses are mutually backed up by manual bus tie switches. When the step-down silicon link is open, it will lead to the loss of power of the DC power bus, which will lead to the failure of various control and protection devices, and expand the fault range of the substation. This system architecture can no longer meet the needs of safe power supply of the DC power system. [0003] At present, the open-circuit protection of the step-down silicon ...

AI Technical Summary

Problems solved by technology

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a two-stage DC power supply bus with step-down silicon link open-circuit protection system, which can safely and reliably solve the problem of control bus failure due to step-down silicon link open-circuit faults and other reasons. The problem of voltage loss improves the operational reliability of the DC power system of the substation

Images