Gateways
A contactor and inter-network technology, applied in electrical components and other directions, can solve the problems of large operating loss, high investment cost of converters, and no electrical interconnection of DC power grids, so as to reduce operating losses, reduce system investment, and reduce conversion. The effect of flow capacity
Active Publication Date: 2015-04-29
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0005] Therefore, at least four converters are required to interconnect one AC grid and two DC grids using conventional technology, and the total investment cost of the converters required is high and the operating loss is large
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[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0046] The interconnector provided by the embodiment of the present invention is used to interconnect two DC power grids with different rated DC voltages and an AC power grid, which can solve the problem that the existing AC and DC power grid interconnection technology can only be interconnected with one DC power grid. The disadvantages of high cost and large loss of the converter caused by the ...
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The invention discloses one gateway I. The gateway I comprises a first converter and a second converter, wherein a positive pole of the first converter is connected with a positive pole of a second direct-current power grid, a negative pole of the first converter is connected with a positive pole of a first direct-current power grid, a positive pole of the second converter is connected with a negative pole of the first direct-current power grid, a negative pole of the second converter is connected with a negative pole of the second direct-current power grid, and alternating-current ends of the first converter and the second converter are connected with an alternating-current power grid through an alternating-current transformer. The invention further discloses the other gateway II. The gateway II comprises a converter, wherein a positive pole of the converter is connected with the positive pole of the second direct-current power grid, a negative pole of the converter is connected with the positive pole of the first direct-current power grid, and an alternating-current end of the converter is connected with the alternating-current power grid through the alternating-current transformer. With the adoption of the gateways, interconnection transmission of the two direct-current power grids and the alternating-current power grid can be realized, compared with traditional gateways, the gateways have the advantages that the number of the converters is reduced, the capacity of the converters is reduced, and the system investment and the operation loss of an interconnection system are significantly reduced.
Description
technical field [0001] The invention belongs to the technical field of flexible power transmission and distribution of power systems, and in particular relates to a network connector for interconnecting two DC power grids and an AC power grid. Background technique [0002] With the development of modular multilevel converters, the use of modular multilevel converters to construct DC power grids has become a hot spot in the power industry in recent years. Interconnection of various regional DC grids and AC grids where existing systems are already in operation in large numbers is an urgent problem to be solved. [0003] The existing conventional technology generally uses an AC-DC converter to interconnect the AC power grid and the DC power grid. In order to interconnect the two DC power grids, a DC-AC-DC converter is usually required. Taking the interconnection of an AC grid and two DC grids as an example, in order to realize the interconnection between the AC grid and the tw...
Claims
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IPC IPC(8): H02J5/00
Inventor 林卫星文劲宇程时杰
Owner HUAZHONG UNIV OF SCI & TECH