Multi-port DC flexible multi-state switch device based on bifurcated bridge arm structure
A switching device, multi-state technology, applied in the output power conversion device, the conversion of DC power input to DC power output, the power transmission AC network, etc. The volume of the device and the effect of efficient connection
Active Publication Date: 2021-07-13
ZHEJIANG UNIV +2
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Zhao Chengyong and others proposed a single-phase non-isolated DC converter based on the traditional MMC topology in the document "New Modular High-Voltage High-Power DC-DC Converter [J]. Power System Automation, 2014, 38(4): 72-78". -DC MMC converter, non-isolated DC-DC MMC, because there is no intermediate transformer, the transformation ratio is limited to a certain extent, and it is only used in occasions with low voltage transformation ratio requirements, such as high-voltage and high-power DC transmission systems with similar voltage levels interconnected
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[0020] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0021] The topology of the multi-port DC flexible multi-state switching device based on the bifurcated bridge arm structure of the present invention is composed of a two-port MMC adopting the bifurcated bridge arm structure and a plurality of full-bridge converters, and the two parts are connected through an intermediate frequency transformer.
[0022] (1) Two-port MMC with bifurcated bridge arm structure.
[0023] In this embodiment, a two-port MMC with a bifurcated bridge arm structure is used, and its main power topology is as follows: figure 1 Shown in the dotted box on the left. Two-phase twelve bridge arm structure, each bridge arm is composed of multiple half-bridge sub-modules cascaded, the two bridge arms in each phase are connected to the posit...
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The invention discloses a multi-port DC flexible multi-state switch device based on a bifurcated bridge arm structure, which is composed of a multi-port MMC with a bifurcated bridge arm structure and a traditional full-bridge converter. Connection, the multi-port MMC with bifurcated bridge arm structure on the primary side is composed of twelve bridge arms in two phases, and the middle bridge arm is bifurcated to form a multi-port. The invention transforms and integrates the topology of the traditional modular multi-level converter, and uses a small number of switching devices and capacitors through the bifurcated bridge arm structure of the original side to realize simultaneous transmission of high-voltage DC networks to multiple low-voltage DC networks. Power transmission, so as to meet the respective functional requirements of the DC grid for the flexible multi-state switch device, and can connect multiple DC grids of different voltage levels to realize power transmission between multiple DC grids.
Description
technical field [0001] The invention belongs to the technical field of flexible multi-state switches, and in particular relates to a multi-port DC flexible multi-state switch device based on a bifurcated bridge arm structure. Background technique [0002] With the aggravation of world energy shortage and environmental pollution, distributed energy technology has developed rapidly; compared with traditional AC grid, DC grid is easier to realize distributed energy access, and has the advantages of low loss, low environmental pollution, and high power quality. , which has received extensive attention and research. In addition, when the effective value of AC and DC is the same, the peak value of AC voltage is larger than the peak value of DC voltage, so the requirements for the insulation strength of cables are stricter, so the cost of DC cables is also lower. In the AC distribution network, the AC transmission capacity is limited by the power angle stability problem between sy...
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IPC IPC(8): H02J3/36H02M3/335
CPCH02J3/36H02M3/33576Y02E60/60
Inventor 邓焰王昆许颖飞杨勇李继红陆翌王朝亮许烽
Owner ZHEJIANG UNIV