Shore-based power supplying system

Abstract

The invention provides a shore-based power supplying system which comprises a high-voltage wire entering cabinet, a wire entering transformer, a frequency conversion power supply wire entering cabinet, a frequency conversion power supply, a frequency conversion power supply wire exiting cabinet, a wire exiting transformer, a high-voltage wire exiting cabinet and a leading edge electricity connection box. A wire entering end of the high-voltage wire entering cabinet is in electric connection with a shore-side power grid. The high-voltage wire entering cabinet, the wire entering transformer, the frequency conversion power supply wire entering cabinet, the frequency conversion power supply, the frequency conversion power supply wire exiting cabinet, the wire exiting transformer, the high-voltage wire exiting cabinet and the leading edge electricity connection box are sequentially connected in an electric mode. A wire exiting end of the leading edge electricity connection box is in electric connection with a boat power grid. The frequency conversion power supply is used for converting 50HZ grid frequency into an adjustable frequency from 0 HZ to 60 HZ and comprises multiple frequency conversion unit circuits. Each frequency conversion unit circuit comprises an alternating current (AC)-direct current (DC) rectifier bridge circuit and a DC-AC inverter bridge circuit, wherein the AC-DC rectifier bridge circuit is in series linkage with the DC-AC inverter bridge circuit. The multiple frequency conversion unit circuits are linked in parallel and redundant to each other. The shore-based power supplying system can effectively reduce black-out possibilities.

Description

technical field [0001] The invention relates to the technical field of shore-based power supply, in particular to a shore-based power supply system. Background technique [0002] Most ships use fuel-fired generator sets as the source of power. After the ship berths at the port, the auxiliary fuel-fired generators on board continue to operate and continue to supply power to the ship's load. The fuel oil will produce more harmful gases and combustion particles during its energy conversion process, and these emissions will pollute the environment, affect air quality, and generate a lot of noise. [0003] Therefore, in order to provide power to ships, ports need to set up shore-based power supply and distribution systems. The existing port shore-based power supply and distribution system generally includes: high-voltage incoming cabinet, cascaded structure variable frequency power supply, positive wave filter, high-voltage outgoing cabinet and connection box. However, when a u...

AI Technical Summary

Problems solved by technology

However, when a unit of the variable frequency power supply of the cascade structure fails, the system must be shut down for maintenance, resulting in interruption of power supply.

[0004] To sum up, the shore-based power supply system in the prior art has the technical problem that a unit failure of the frequency converter will cause the power supply to be interrupted

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