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Protection configuration method of flexible direct-current (DC) transmission system of modular multiple-level converter

A modular multi-level, flexible DC technology, applied in the direction of converting AC power input to DC power output, emergency protection circuit devices, output power conversion devices, etc., can solve problems such as large differences and inapplicability, and achieve reliable isolation. , to achieve the effect of fault detection and protection action

Active Publication Date: 2011-07-20
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the structure of the main circuit of the flexible DC transmission system using modular multi-level converters will be quite different from the original two-level converters, the original protection configuration method of the flexible DC transmission system Not applicable to existing flexible direct current transmission system

Method used

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  • Protection configuration method of flexible direct-current (DC) transmission system of modular multiple-level converter
  • Protection configuration method of flexible direct-current (DC) transmission system of modular multiple-level converter
  • Protection configuration method of flexible direct-current (DC) transmission system of modular multiple-level converter

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Embodiment Construction

[0037] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] The invention provides a protection hierarchical configuration method for the flexible DC system of the modular multilevel converter, which can realize the fast protection requirements under various faults, image 3 is a schematic diagram of the protection partition of the modular multilevel converter MMC flexible direct current transmission system, such as image 3 As shown, the protection configuration area includes all flexible DC transmission system equipment; the protection configuration area includes all equipment in the AC field area, converter valve area and DC field area; the protection configuration method is as follows, Figure 4 is a schematic diagram of the protection layers of the modular multilevel converter MMC flexible direct current transmission system, such as Figure 4 Shown:

[0039] The und...

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Abstract

The invention relates to a protection configuration method of a flexible direct-current (DC) transmission system of a modular multiple-level converter, which comprises the steps of: using three layers of protection configuration, i.e., a submodule layer, a converter valve layer and a convertor station layer; setting a submodule layer protection function in a submodule controller; setting in a valve based controller (VBC) by the converter valve layer aiming at a failure protection function of a single converter valve; and realizing functions of failure protection of the converter station layer and a DC system in a system control protection equipment PCP (Primary Control Program). The method provided by the invention ensures that the flexible DC transmission system can rapidly carry out a protection action under an abnormal working condition, prevents overstress from continuously developing and isolates a failure assembly.

Description

technical field [0001] The invention relates to a protection configuration method in the field of flexible direct current transmission (VSC-HVDC), in particular to a protection configuration method for a flexible direct current transmission system of a modular multilevel converter. Background technique [0002] Modular multi-level technology, as a flexible DC transmission technology that can be applied in high-voltage DC transmission occasions, has broad application prospects and excellent application performance. It is of great significance to realize the wide application of this technology. Difficulties loom, too. [0003] Due to the complexity of practical applications, the overvoltage and overcurrent stress suffered by the fragile switching device (IGBT) used in the modular multilevel system is often unacceptable under abnormal working conditions of the system, so it must be designed to be reliable and fast protection strategy for fault isolation. [0004] Modular mult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/00H02H7/125
CPCH02M1/32H02M2007/4835H02M7/4835
Inventor 杨杰赵岩贺之渊马巍巍林畅
Owner CHINA ELECTRIC POWER RES INST
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