Ship DC integrated power propulsion system and protection design method of system

Abstract

The invention relates to a ship DC integrated power propulsion system and a protection design method of the system, and solves the problem that the existing protection methods cannot achieve selectiveprotection of DC integrated power systems. The protection of each frequency conversion module of the DC-side busbar uses fuses as protection devices, and the protection of the generator and its output-side cables is achieved by detecting the imbalance of phase-to-phase current or phase-to-phase voltage by a self-developed generator protection device. In the case of a short-circuit fault of the DCbusbar itself, the invention proposes two protection schemes based on a fuse with an isolating switch and a solid-state circuit breaker. The protection of the propulsion motor and the load-side equipment can be realized by an inverter unit, and the DC system protection design scheme is realized by the methods such as insulation detection in conjunction with a comprehensive control system for theground fault, so that the non-fault side busbar can continuously power while the short-circuit fault is accurately and quickly removed, thereby realizing the system protection selective scheme and ensuing the reliability and safety of the power supply of the ship's power system.

Description

technical field [0001] The invention relates to a marine power system protection technology, in particular to a marine DC integrated electric propulsion system and a protection design method for the system. Background technique [0002] With the advancement of technology, after years of exploration and practice, especially as energy conservation, emission reduction, and low-carbon environmental protection have increasingly become the consensus of human development, the power system of the ship is gradually transitioning from the AC integrated electric propulsion system to the DC integrated electric propulsion system At present, foreign companies represented by ABB, SIEMENSE, and EMS have launched their own ship DC integrated power system solutions. Compared with the traditional AC integrated power system, its structure is simpler. In addition to eliminating the propulsion transformer, the switchboard and the propulsion frequency converter are combined into one, thereby great...

AI Technical Summary

Problems solved by technology

[0006] The present invention is aimed at the problem that the protection selectivity of the DC integrated electric propulsion system used by ships is difficult to realize, and proposes a ship DC integrated electric propulsion system and a protection design method for the system, which only isolates the faulty frequency conversion module or isolates one side of the bus coupler. Greatly reduces the scope of influence of failures and improves the reliability and safety of ship operation

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