Direct-current fault ride-through device suitable for hybrid modular multilevel converter and control method thereof
A modular multi-level, DC fault ride-through technology, used in output power conversion devices, conversion of AC power input to DC power output, power transmission AC network, etc., can solve problems such as high cost and complicated control, and reduce effect of total cost
Inactive Publication Date: 2021-09-21
NORTHEAST FORESTRY UNIVERSITY
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However, although the cost of mechanical DC circuit breakers is lower, the number of power electronic devices required by the full-bridge sub-module is twice that of the half-bridge sub-module, which is high in cost and complicated to control
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[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0026] In this embodiment, the structure of the DC fault ride-through device applicable to the hybrid modular multilevel converter is as follows: figure 1 As shown in (b), it includes a grid, a transformer, a mechanical DC circuit breaker, and a hybrid modular multilevel converter. The input end of the transformer 1 is connected to the grid 1, and the output end of the transformer 1 is connected to the hybrid modular The input end of the multilevel converter 1 is connected, the output end of the hybrid modular multilevel converter 1 is connected to the input end of the mechanical DC circuit breaker 1, and the output end of the mechanical DC circuit breaker 1 is connected to the mechanical The input end of the DC circuit breaker 2 is connected, the output end of the mechanical DC circuit breaker 2 is connected to the input end of the hybrid modular multi...
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The invention discloses a direct-current fault ride-through device suitable for a hybrid modular multilevel converter and a control method thereof, and belongs to the field of direct-current fault protection of a flexible direct-current power transmission system. The direct-current fault ride-through device suitable for the hybrid modular multilevel converter structurally comprises a power grid, a transformer, a mechanical direct-current circuit breaker and the hybrid modular multilevel converter. According to the control method, on-off of IGBTs in the full-bridge sub-modules is controlled to enable the IGBTs to output a negative level to suppress a fault current, meanwhile, the full-bridge sub-modules are matched with the mechanical direct-current circuit breaker, and direct-current fault ride-through is completed through coordination control of the two. According to the method provided by the invention, the proportion of the full-bridge sub-modules in all the sub-modules can be remarkably reduced, the hardware cost is reduced, and meanwhile, the reliability of the fault ride-through method is further improved in cooperation with a cheap mechanical direct-current circuit breaker.
Description
Technical field [0001] The invention relates to the field of DC fault protection for flexible DC transmission systems, and specifically relates to a DC fault ride-through device suitable for hybrid modular multi-level converters and a control method thereof. Background technique [0002] With the vigorous development of China's power industry, the number and total transmission capacity of domestic UHV DC transmission projects are increasing year by year. Among them, high-voltage DC transmission technology based on modular multi-level converters (MMC-HVDC) is an important factor in building modern energy. One of the key technologies of the system. How to make the MMC-HVDC system have DC fault ride-through capability is a key issue to improve the reliability of high-voltage DC transmission. [0003] At present, in order to solve the problem of making the MMC-HVDC system have DC fault ride-through capability, many academic papers and patents have been studied and corresponding...
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IPC IPC(8): H02M7/219H02M1/32H02J3/36
CPCH02M7/219H02M1/32H02J3/36Y02E60/60
Inventor 刘一琦段昭宇李炳坤金泳霖
Owner NORTHEAST FORESTRY UNIVERSITY