Three-port dc converter with dc short circuit fault protection and method of operation

By designing a three-port DC-DC converter with DC short-circuit fault protection, and utilizing a fault current limiting circuit and a three-phase transformer module to achieve fault current limitation and isolation, the impact of short-circuit faults on the DC output side of traditional DC-DC power converters is solved, thereby improving the stability and safety of the power grid.

CN117220481BActive Publication Date: 2026-06-19STATE GRID FUJIAN ELECTRIC POWER CO LTD +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
STATE GRID FUJIAN ELECTRIC POWER CO LTD
Filing Date
2023-08-31
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Short circuits and overcurrent faults on the DC output side of traditional DC-DC power converters affect power quality and system stability. Furthermore, traditional fault current limiters cause AC voltage drops and power losses during normal system operation, reducing system response speed and stability.

Method used

A three-port DC-DC converter with DC short-circuit fault protection is adopted, including a fault current limiting circuit, a partial power H-bridge circuit and a three-phase transformer module. Fault current is limited by the coupling mutual inductance of the main reactor and the auxiliary reactor, and short-circuit fault isolation is achieved by using diodes, reducing the use of circuit breakers.

Benefits of technology

When a short-circuit fault occurs on the DC side, the current is effectively limited to less than 1.5 times the rated current, the fault current is quickly reduced to zero, the operating and maintenance costs of the system circuit breaker are reduced, and the stability and safety of the power grid are improved.

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Abstract

This invention relates to a three-port DC-DC converter with DC short-circuit fault protection and its operating method. It includes a fault current-limiting circuit, three partial-power H-bridge circuits, a partial-power three-phase bridge circuit, and a three-phase transformer module. One end of the fault current-limiting circuit is connected to the input terminal of the DC power supply, and the other end is connected to the partial-power three-phase bridge circuit and the first partial-power H-bridge circuit. The three partial-power H-bridge circuits are connected in series to transmit the main power within the total power range, while the partial-power three-phase bridge circuit is used to transmit a portion of the power within the total power range. The three-phase transformer module connects the three partial-power H-bridge circuits and the first partial-power three-phase bridge circuit. This invention, while achieving multi-port output power conversion, provides DC-end fault current limiting and short-circuit fault isolation functions, reducing the need for grid circuit breakers and other fault limiting devices, and lowering subsequent maintenance costs.
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