Protection equipment, protection control method and modular multilevel converter

A multi-level converter, modular multi-level technology, applied in emergency protection circuit devices, AC power input is converted into AC power output, AC power input is converted into DC power output and other directions, which can solve problems such as safety accidents. , to achieve the effect of ensuring normal operation and preventing the expansion of faults

Active Publication Date: 2019-06-07
BEIJING ETECHWIN ELECTRIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Expansion of faults will cause potential safety hazards and accidents are prone to occur

Method used

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  • Protection equipment, protection control method and modular multilevel converter
  • Protection equipment, protection control method and modular multilevel converter
  • Protection equipment, protection control method and modular multilevel converter

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Embodiment Construction

[0050] The characteristics and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only configured to explain the present invention, not to limit the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention.

[0051] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and ...

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Abstract

The embodiment of the present invention discloses a protection device, a protection control method, and a modular multilevel converter. The device includes: multiple protection devices and controllers; each protection device includes: N capacitors, N DC short circuits The control unit and N+1 fast fuses; the fast fuses are connected between the DC bus and the DC bus; the controller is respectively connected to the DC short-circuit control unit in each protection device, and is used to control the conduction of the DC short-circuit control unit , to protect the multilevel converter module without short-circuit fault of power semiconductor devices. The fast fuse is not connected in series in the circuit, only a very small power balance current is passed through, and no working current is passed through, so there is no need for cooling design for the fast fuse; and it can prevent the expansion of faults and ensure the normal operation of converters that have not failed ; It can also reduce the occurrence of potential safety hazards and improve safety.

Description

technical field [0001] The invention relates to the technical field of circuit electronics, in particular to a protection device, a protection control method and a modular multilevel converter. Background technique [0002] A converter is an electrical device that changes the voltage, frequency, number of phases, and other quantities or characteristics of a power system. In order to solve the problem of the high current of the converter connected to the grid, the converter generally adopts a parallel connection to meet the high current requirements of the converter. [0003] The parallel connection mode of the converters is mainly: the DC bus bars of the converters are connected in parallel, and the AC output terminals are also connected in parallel, and the synchronous pulse control method is used to control each converter. [0004] When a short-circuit fault occurs in one of the parallel converters, it is necessary to quickly remove the faulty converter to prevent the fau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/122H02M7/483
CPCH02H7/1225H02M7/483H02M7/4835H02M1/32H02M5/4585H02M7/487
Inventor 符松格
Owner BEIJING ETECHWIN ELECTRIC
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