Symmetrical bipolar MMC DC-side single-pole ground fault ride-through and recovery method

A single-pole grounding fault and recovery method technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of large inrush current stress, large active power shortage, etc., to reduce the surge current rise rate, reduce power Deficiency, the effect of reducing the impact

Active Publication Date: 2017-08-18
HUAZHONG UNIV OF SCI & TECH
View PDF5 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the above defects or improvement needs of the prior art, the present invention provides a ride-through method and recovery strategy for symmetrical bipol

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Symmetrical bipolar MMC DC-side single-pole ground fault ride-through and recovery method
  • Symmetrical bipolar MMC DC-side single-pole ground fault ride-through and recovery method
  • Symmetrical bipolar MMC DC-side single-pole ground fault ride-through and recovery method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0060] In order to make the object, technical solution and advantages of the present invention clearer, 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 used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0061] The present invention takes double-terminal symmetrical bipolar MMC as an example to describe the single-pole grounding fault ride-through and recovery strategy of symmetrical bipolar MMC. figure 1 It is a schematic diagram of the topology of a double-ended symmetrical bipolar MMC system, including two converter stations. Each converter station adopts a symmetrical bipolar main connectio...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a symmetrical bipolar MMC DC-side single-pole ground fault ride-through and recovery method. Through cooperation of a DC circuit breaker and a converter, DC fault current cut-off and power recovery are realized, and safe operation of the converter is protected. Through cooperation of active power and reactive power of the sound pole and the faulty pole, the active power deficiency of a converter station in the failure period is reduced. Rated reactive power is supplied to the grid, and therefore, the impact of a fault to an AC system is reduced. By actively controlling the common-mode components of the reference voltages of the upper and lower bridge arms of the converter, the risk brought to the safe operation of the system by excessive current surge stress of the converter due to reclosing failure is avoided. Based on the fact that a dual-pole short-circuit fault at the DC side of a symmetrical bipolar MMC can be regarded as a special case of single-pole ground faults of both positive and negative DC buses, the method of the invention can be used to handle a dual-pole short-circuit fault at the DC side of a symmetrical bipolar MMC.

Description

technical field [0001] The invention belongs to the field of DC fault protection of a flexible high-voltage direct current transmission system, and more specifically relates to a single-pole grounding fault ride-through and recovery method on the DC side of a symmetrical bipolar MMC. Background technique [0002] Due to the increasingly prominent problems of energy shortage and environmental protection, the proportion of new renewable energy such as wind power and solar energy in the total power generation is gradually increasing. In my country, wind energy, solar energy and other energy sources are mostly concentrated in remote areas, resulting in an uneven geographical distribution of energy and loads, requiring long-distance, large-capacity transmission of electric energy. When applied to long-distance, large-capacity power transmission, the cost and reactive power loss of high-voltage AC power transmission system increase rapidly with the increase of power transmission d...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 林磊何震胡家兵徐晨胡凯
Owner HUAZHONG UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap