Flexible access substation and control method thereof

Abstract

The present invention discloses a flexible access substation. The flexible access substation includes N sets of frequency conversion access systems, where N is an integer greater than or equal to 1, each set of frequency conversion access system includes a first AC-DC-AC converter, a first output circuit breaker, and a first power distribution system. The first power distribution system includes an AC incoming line, an AC bus, and at least one outgoing line. An output side of the first AC-DC-AC converter is connected to one end of the AC incoming line of the first power distribution system byusing the first output breaker. The present invention further discloses a control method of the flexible access substation, a set of converters can be simultaneously connected to a plurality of berths, and a docking vessel can access a shore power in a plug-and-play manner, so that investment costs of the shore power equipment are reduced, convenience of accessing the shore power is improved. In an interconnection mode, mutual support between AC buses can be implemented with high reliability.

Description

technical field [0001] The invention relates to a flexible access substation and a control method, belonging to the technical field of high-power electric power electronics. Background technique [0002] Shore power access technology means that when the ship is in port, the generator on the ship is stopped and the land power is used instead. The shore power converter / AC-DC converter is the core of the frequency conversion access system, responsible for converting the 50HZ AC power on the shore into the 60HZ AC power required by the ship through the AC-DC-AC frequency conversion link. In the existing technology, there is a one-to-one relationship between the shore power converter and the power supply berth. The main problems in the existing technology lie in the following points: (1) The frequency required by the ship currently includes two specifications of 50Hz and 60Hz. The direct-to-air converter needs to be switched according to the frequency of the access ship, which c...

AI Technical Summary

Problems solved by technology

In the existing technology, there is a one-to-one relationship between the shore power converter and the power supply berth. The main problems in the existing technology lie in the following points: (1) The frequency required by the ship currently includes two specifications of 50Hz and 60Hz. The DC converter needs to be switched according to the frequency of the access ship, which cannot realize plug-and-play, and cannot realize simultaneous access to ships of two frequencies

(2) Due to the large capacity range of the ship, 100kW-16MW, when designing shore power, because it is a one-to-one power supply, it needs to be designed according to the maximum capacity. In the state of low-load operation, resulting in low equipment utilization, which is a waste of cost

(3) The access power of the shore power is taken from the original wharf power distribution system. It is necessary to increase the capacity of the existing power distribution system. One-to-one power supply mode, the demand for the capacity of the power distribution system is too large, if there are 4 sets For a 10MW shore power berth, the total capacity expansion requirement is 40MW. Due to the limitation of the capacity of the upper-level power grid, the existing terminal power distribution system may not be able to meet the capacity expansion demand, and needs to be expanded, which increases the difficulty and cost of capacity expansion and transformation.

(4) Under the current power supply mode of one-to-one power supply, the important load of the ship is powered by a single channel, and the reliability of the power supply is low. Once the AC-DC converter fails, the load will completely lose power

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