Ship direct-current grid-connected system and simulation method for short-circuit protection of ship direct-current grid-connected system

Abstract

The invention belongs to the technical field of protection circuits, and relates to a ship direct-current grid-connected system and a short-circuit protection simulation method thereof, and the methodcomprises the steps: analyzing a main circuit of a system at a short-circuit fault moment, and building an equivalent circuit model thereof; building an internal model of each functional module in the equivalent circuit model; establishing an overall simulation model of the system, and setting simulation environment parameters; and simulating each short-circuit fault point of the system in sequence, analyzing the fusing time sequence of each fuse, and adjusting the parameters of the fuses to meet the short-circuit protection design requirements of the system. Based on the simulation method, the transient change and the fusing time sequence of the system can be accurately and visually reflected when each branch has a fault, the design scheme of short-circuit protection and coordination protection of the system is checked and corrected, a theoretical basis and support are provided for a short-circuit test of a real object, and the accuracy of a simulation result is ensured.

Description

technical field [0001] The invention belongs to the technical field of protection circuits, and relates to a marine DC grid-connected system, in particular to a marine DC grid-connected system and a simulation method for short-circuit protection thereof. Background technique [0002] In recent years, due to its advantages of zero pollution, zero emission, low noise, low vibration, etc., pure electric ships have been piloted and popularized in Liangjiang and Neihu, such as official ships and sightseeing ships. Among them, DC grid-connected technology is the core technology of pure battery ships. For the DC grid-connected power distribution system of ships, China Classification Society (CCS) has stricter requirements on short-circuit current calculation and coordination protection analysis. The road needs to be cut and isolated, and the rest of the system is kept and working normally. Then, in the short-circuit protection design of the system, it is necessary to check and ve...

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Problems solved by technology

[0004] However, standards and methods for AC systems do not apply to DC systems

There are very few electric propulsion methods for DC grid-connected pure electric ships, and none have passed the certification of China Classification Society (CCS). At present, there is no inherent calculation method for DC grid-connected short-circuit current and verification of coordinated protection schemes. method

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