Marine off-grid and grid-connected hybrid bi-directional frequency-conversion converter suitable for kHz-level alternating current

Abstract

The invention discloses a marine off-grid and grid-connected hybrid bi-directional frequency-conversion converter suitable for kHz-level alternating current. The converter comprises a 24-pulse phase-shifting voltage transformation rectification module, a DC-AC inversion module, an LCL filter module and a medium voltage isolation transformer module which are connected in sequence; the DC-AC inversion module is further connected with an off-grid / grid-connected inversion control module, and the off-grid / grid-connected inversion control module is further connected with the two ends of the LCL filter module through a communication and control signal line; the input end of the 24-pulse phase-shifting voltage transformation rectification module is connected with the kHz-level three-phase alternating current; the output end of the medium voltage isolation transformer module is connected with a ship medium voltage power grid; a ship main power distribution board and a control switch are arranged between the LCL filter module and the medium voltage isolation transformer module; the control switch is connected with a ship low voltage power grid. According to the converter, the harmonic content in the input high-frequency three-phase alternating current can be effectively reduced, ripple waves in direct-current output voltage can also be reduced at the same time, harmonic pollution on theship power grids is reduced accordingly, and the reliability and electric energy quality of the ship power grids are improved.

Description

technical field [0001] The invention relates to the technical fields of power generation from smoke and tail gas waste heat of a main engine of a ship, electric energy conversion and grid connection of a ship power system, in particular to a marine off-grid hybrid two-way frequency conversion converter suitable for kHz-level alternating current. Background technique [0002] At present, the issue of ship energy saving and emission reduction has attracted great attention from the international community. While providing policy support, major shipping countries have invested a lot of manpower, material and financial resources to effectively achieve the fundamental goal of energy saving and emission reduction. In 2009, at its 59th meeting, the International Maritime Organization’s Marine Environment Protection Committee (MEPC) proposed and formulated the “Energy Efficiency Design Index (EEDI) for new ships”, which requires that all factors that affect ship energy efficiency be e...

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is that there is no special solution in the prior art to solve the drive operation of the compressor module in the high-speed turbine generator set of the Brayton cycle, and the output of the permanent magnet synchronous generator module. To solve the defects of piezoelectric network grid-connected output, provide a marine off-grid hybrid bidirectional variable frequency converter suitable for kHz-level alternating current

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