Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Control method for improving cascaded hybrid direct current mono-pole operation power limit

A hybrid DC and operating power technology, applied in reactive power adjustment/elimination/compensation, flexible AC transmission system, power transmission AC network, etc., can solve the problem of lowering the AC bus voltage, increasing LCC DC commutation failure, and consumption Reactive power increase and other problems, to achieve the effect of simple control and reduce the risk of commutation failure

Active Publication Date: 2021-07-02
JIANGSU ELECTRIC POWER RES INST +1
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] If only the cascaded hybrid DC unipolar operating power is increased, the increase of LCC DC power will inevitably lead to the increase of LCC DC reactive power consumption, and the increase of LCC DC reactive power demand will cause it to absorb a large amount of reactive power from the adjacent AC system , lowering the AC bus voltage to a certain extent, increasing the risk of LCC DC commutation failure; on the other hand, the increase in LCC DC reactive power demand may cause the action of the reactive power compensation device of the AC system, which brings additional control problems

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
  • Control method for improving cascaded hybrid direct current mono-pole operation power limit
  • Control method for improving cascaded hybrid direct current mono-pole operation power limit
  • Control method for improving cascaded hybrid direct current mono-pole operation power limit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] The present invention provides a control method for increasing the operating power limit of cascaded hybrid DC unipolar poles. First, the cascaded hybrid DC pole I is normally unlocked and started to a rated operating state, and the LCC converter station of pole II is in a shutdown state, and then Unlock the MMC converter station of Pole II and work in STATCOM (Static Synchronous Compensator, Static Synchronous Compensator) mode, and increase the reactive power through the MMC converter station of Pole II to meet the reactive power demand of LCC DC after the power of Pole I is increased. Specific steps are as follows:

[0023] Step 1: In a cascaded hybrid DC system with multi-point receivers, unlock the cascaded hybrid DC pole I under a given AC system operation mode; the specific method is: first unlock the low end of the rece...

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 discloses a control method for improving the operation power limit of a cascaded hybrid direct-current mono-pole. The control method comprises the following steps: firstly, normally unlocking and starting a cascaded hybrid direct current pole I to a rated operation state, enabling an LCC converter station of a pole II to be in a shutdown state, then unlocking an MMC converter station of the pole II and working in an STATCOM mode, increasing reactive power through the MMC converter station of the pole II, and satisfying the reactive power requirement of the LCC direct current after the power of the pole I is improved. On the premise that no extra reactive power compensation device is added, the reactive power requirement of the LCC direct current after the hybrid direct current mono-pole power is improved is met, and a hybrid direct current mono-pole system can operate normally and stably; and the risk of LCC direct current commutation failure after the mono-pole power is increased can be reduced, the control is simple, and no additional equipment is needed.

Description

technical field [0001] The invention relates to the technical field of hybrid direct current transmission, in particular to a control method for increasing the operating power limit of cascaded hybrid direct current unipolar operation. Background technique [0002] Due to the combination of conventional direct current (LCC-HVDC) and flexible direct current (VSC-HVDC) two respective advantages, hybrid direct current transmission has become an important development direction of direct current transmission technology in recent years. Receiver cascaded hybrid DC power transmission (such as figure 1 )’s rectifier station consists of two sets of 12-pulse LCCs in series, and the inverter station consists of a set of 12-pulse commutation converters (LCCs) and voltage source converters (VSCs) connected in series in parallel, and the low-end VSC is extended to Multiple VSCs are connected in parallel and placed on different regional power grids. While increasing the transmission power...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/18
CPCH02J3/18H02J3/36Y02E40/10Y02E60/60
Inventor 赵静波王大江朱宇萌王相飞李保宏
Owner JIANGSU ELECTRIC POWER RES INST
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
Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com