High-reliability double-bus mutual hot backup automatic compensation device and control method

Abstract

The invention provides a high-reliability double-bus mutual hot backup automatic compensation device which comprises an open-loop bidirectional LLC conversion circuit, the open-loop bidirectional LLC conversion circuit is connected with a BUCK1 conversion circuit and a BUCK2 conversion circuit at the same time, and the BUCK1 conversion circuit and the BUCK2 conversion circuit are controlled through a double-port voltage analog control circuit based on mixed inductor current sampling. According to the invention, a reliability problem of a dual-bus mutual hot standby bidirectional DC-DC converter is solved, the dual BUCK and the bidirectional open-loop LLC converter are adopted to form the hybrid bidirectional DC-DC converter, and a specific dual-port voltage analog control circuit based on hybrid inductive current sampling is matched, so that rapid output is realized and high reliability of the system is considered.

Description

technical field [0001] The invention relates to the technical field of DC power supply systems, in particular to an automatic compensation device and a control method with high reliability dual busbars serving as hot backup for each other. 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. [0003] In order to further improve the power supply reliability of the system, two sets of DC power supply systems are generally used for mutual hot backup. When there is a problem with the power supply of one system, it can be provided by the other set of power supply. However, complete electrical isolation is required between the two sets of DC power supply systems, so bidirectional DC-DC is generally used to connect the two sets of DC power supplies. The added bidirectional DC-DC needs to have higher reliability requirements, otherwise the reliability of...

AI Technical Summary

Problems solved by technology

The added bidirectional DC-DC needs to have higher reliability requirements, otherwise the reliability of the original system will be reduced

[0004] At present, the bidirectional DC-DC scheme in the power electronic topology generally uses a full-bridge topology as the input stage, and when the upper and lower switch tubes in series in the full-bridge topology fail, it will cause a short circuit in the input stage, even if the fuse is blown. A large inrush current will be generated, which will affect the power supply reliability of the system

[0005] In addition, bidirectional DC-DC also needs to have bidirectional fast switching, dual-port voltage control, bidirectional parallel current sharing control and other functions, which require complex logic judgment and timing control, and the increase in system complexity will also reduce system reliability.

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