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Half-bridge MMC-based bipolar short-circuit protection method of medium-voltage DC distribution network

A double-pole short-circuit, DC circuit breaker technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of high amplitude, IGBT and diode impact, and small breaking capacity of DC circuit breakers

Inactive Publication Date: 2019-07-23
SOUTHEAST UNIV
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  • Abstract
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Problems solved by technology

[0003] Purpose of the invention: The purpose of the present invention is to solve the problem that the fault current rising rate is fast and the amplitude is high after the short circuit occurs between the poles of the existing DC distribution network based on the modular multilevel converter, which causes damage to the IGBT and the diode in the sub-module. Irreversible impact, and the problem that the breaking capacity of current DC circuit breakers is generally small

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  • Half-bridge MMC-based bipolar short-circuit protection method of medium-voltage DC distribution network
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  • Half-bridge MMC-based bipolar short-circuit protection method of medium-voltage DC distribution network

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[0028] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0029] The invention proposes a bipolar short-circuit protection method for a medium-voltage DC distribution network based on a half-bridge type MMC, and the invention is applicable to a double-terminal DC distribution network.

[0030] figure 1 It is a model of a double-ended medium-voltage DC distribution network. The half-bridge MMC converter is connected to the AC power grid through an AC transformer, and the medium-voltage DC bus is drawn out on the DC side and supp...

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Abstract

The invention proposes a half-bridge MMC-based bipolar short-circuit protection method of a medium-voltage DC distribution network. A DC voltage and a DC current are used as protection starting thresholds, the fault current attenuation is accelerated by a bridge arm current-limiting module with regard to the problems of slow bipolar short-circuit fault current and excessively large steady-state current, the steady-state amplitude is reduced, the off capacity of a DC circuit breaker is reduced, and a fault circuit is more rapidly removed. By the half-bridge MMC-based bipolar short-circuit protection method, the rapid fault removal when bipolar short circuit occurs in the DC circuit can be achieved, local measurement is performed, no communication delay is generated, a fault current is cutoff by the DC circuit breaker, and the action speed is rapid.

Description

technical field [0001] The invention relates to a bipolar short-circuit protection method for DC distribution network lines based on a half-bridge MMC, and belongs to the field of relay protection for DC distribution networks. Background technique [0002] With the rapid development of power electronics technology, DC power distribution technology has attracted extensive attention from scholars at home and abroad due to its advantages such as low line cost, low loss, high power supply reliability, and environmental protection. Compared with the traditional grid commutated converter (Line Commutated Converter, LCC), the modular multi-level converter (Modular Multi-level Converter, MMC) has no commutation failure, good output characteristics, and modular structure , can achieve fast decoupling control and other advantages, and has been more and more applied in DC distribution network. However, after a short circuit occurs in the DC distribution network based on modular multil...

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 吕家乐陈庆窦晓波王璐瑶杨景刚肖小龙吴在军
Owner SOUTHEAST UNIV
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