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A fault protection method and system for a hybrid cascaded multi-terminal direct current transmission system

A multi-terminal DC and power transmission system technology, applied in emergency protection circuit devices, electrical components, power transmission AC networks, etc., can solve problems such as sub-module overvoltage, and achieve the effect of protecting safety, reducing energy demand, and improving safety

Active Publication Date: 2022-07-22
NR ELECTRIC CO LTD +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a hybrid cascaded multi-terminal direct current transmission system fault protection method and system, which can effectively solve the sub-module overvoltage caused by simultaneous blocking of modular multi-level converters in the hybrid cascaded multi-terminal direct current transmission system problems, can effectively reduce the energy demand of DC energy-consuming devices, and better protect the safety of various equipment

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  • A fault protection method and system for a hybrid cascaded multi-terminal direct current transmission system
  • A fault protection method and system for a hybrid cascaded multi-terminal direct current transmission system
  • A fault protection method and system for a hybrid cascaded multi-terminal direct current transmission system

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Embodiment Construction

[0031] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples are not intended to limit the present invention. Therein, the same reference numerals are used for the same components.

[0032] like figure 1 Shown is a specific embodiment 1 of the fault protection method for a hybrid cascaded multi-terminal DC power transmission system according to the present invention, wherein the hybrid cascaded multi-terminal DC power transmission system includes a rectifier converter station and an inverter converter station, and the rectifier converter station includes at least one group of thyristor converter units, the inverter converter station includes at least one group of voltage source type converters, the voltage source type converters include at least two parallel mo...

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Abstract

The invention discloses a fault protection method for a hybrid cascaded multi-terminal direct current power transmission system. The faulty modular multi-level converter jumps off its connected AC switch, and at the same time sends a phase-shift command to the rectifier-converter station through inter-station communication; the rectifier-converter station immediately executes the phase-shift after receiving the command; After waiting for a first preset time, the station blocks other non-faulty modular multilevel converters connected in parallel. The invention can effectively solve the problem of sub-module overvoltage caused by the simultaneous blocking of modular multi-level converters in the hybrid cascade multi-terminal direct current transmission system, can effectively reduce the energy demand of the direct current energy consumption device, and better protect each equipment security.

Description

technical field [0001] The invention belongs to the field of direct current transmission, and in particular relates to a fault protection method and system for a hybrid cascaded multi-terminal direct current transmission system. Background technique [0002] In recent years, integrated LCC-HVDC has low cost, low loss, mature operation technology, and VSC-HVDC can realize active power and reactive power decoupling control, can supply power to passive network, compact structure, small footprint, no inverter The hybrid DC transmission technology with side commutation failure has been developed rapidly and has good engineering application prospects. By using LCC-HVDC on the rectifier side and VSC-HVDC on the inverter side, the commutation failure on the inverter side can be reduced or avoided. At the same time, to a certain extent, the advantages of the project cost are guaranteed. [0003] In order to meet the requirements of long-distance and large-capacity power transmission...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/122H02H7/125H02J3/36
CPCH02J3/36H02H7/122H02H7/125Y02E60/60
Inventor 赵文强唐俊侍乔明王冰倩常昊添王永平卢宇田杰
Owner NR ELECTRIC CO LTD
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