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Flexible arc extinguishing converter with additional reactive compensation, and control method thereof

A control method and converter technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve the need for increased equipment investment and land occupation Larger, arc hazards to personal safety, etc., to save equipment investment and floor space, improve safety and stability, and ensure no overload operation

Active Publication Date: 2021-04-02
NR ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the no-fault stage, this scheme cannot realize the reactive power compensation function. Since the time of ground fault occurrence is relatively short compared with the full-cycle operation time, the utilization rate of this scheme is extremely poor. Configuring reactive power compensation equipment alone will increase equipment investment and occupy an area demand will also increase
"A voltage control method for active arc suppression devices in distribution networks" (Patent No. 20171022276.X) discloses a new type of arc suppression compensation device, which uses power electronic equipment to compensate a specific voltage vector at the neutral point of the power grid to achieve arc suppression. However, the device cannot realize the reactive power compensation function of the system
[0004] The reactive power compensation function can be realized by using power electronic equipment such as SVG. Since this solution cannot provide active power, it can only provide capacitive current when a ground fault occurs, and cannot achieve complete arc suppression or reliable arc suppression. There is still an arc when a ground fault occurs. Risk of endangering personal safety, currently the program is only applicable to theoretical research
"A comprehensive compensation method for dynamic reactive power and arc suppression compensation" (Patent No. 201910515519.6) discloses a control method that performs reactive power compensation during normal operation of the system. When a ground fault occurs in the system, complete arc suppression cannot be achieved. At the same time, the invention Unable to realize optimal control of reactive power

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  • Flexible arc extinguishing converter with additional reactive compensation, and control method thereof
  • Flexible arc extinguishing converter with additional reactive compensation, and control method thereof
  • Flexible arc extinguishing converter with additional reactive compensation, and control method thereof

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.

[0024] It should be understood that the terms "first", "second" and the like in the claims, specification and drawings of the present application are used to distinguish different objects, rather than to describe a specific sequence. The terms "comprising" and "comprises" used in the specification and claims of this application indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude one or more other features, int...

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Abstract

The embodiment of the invention provides a flexible arc extinguishing converter with additional reactive compensation, and a control method thereof. The flexible arc extinguishing converter with additional reactive compensation comprises a DC / AC converter, an AC / DC converter and an integrated controller, wherein the AC side of the DC / AC converter is boosted by a single-phase transformer of a powerdistribution network system and then is connected to the neutral point of the power distribution network system, and is used for outputting a specific AC voltage vector to realize grounding arc extinction of the power distribution network system, the DC sides of the AC / DC converter and the DC / AC converter are interconnected to form a DC bus, the AC side of the AC / DC converter is connected to a station transformer power supply and is used for controlling the voltage of the DC bus to be constant and performing reactive compensation on the station transformer power supply, the reactive power isdynamically adjusted along with the output voltage and current information of the DC / AC converter, and the comprehensive controller performs information acquisition, controls logic operation and sendsa control command to the AC / DC converter and the DC / AC converter.

Description

technical field [0001] The present application relates to the technical field of application of power electronic equipment in power systems, in particular to a flexible arc-suppression converter with additional reactive power compensation and a control method thereof. Background technique [0002] With the rapid development of the urban distribution network, the power supply lines in the distribution network are increasing and lengthening year by year, resulting in an increase in the capacitive current of the system to the ground, resulting in a grounding arc in the system when a single-phase grounding occurs, endangering personal safety. In addition, the diversification of load forms leads to an increasing demand for reactive power in the distribution network. [0003] At present, the scheme of using power electronic equipment to achieve flexible arc suppression has gradually become a research hotspot in the industry due to its advantages of rapidity, accuracy, and flexibil...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/16H02H9/08
CPCH02J3/1807H02J3/16H02H9/08Y02E60/60
Inventor 蒋顺平丁勇石祥建陶征石勇刘为群陈俊
Owner NR ENG CO LTD
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