A DC Power Control Method for Suppressing Multi-infeed DC Commutation Failure

A multi-feed DC, commutation failure technology, applied in reactive power compensation, AC network circuits, power transmission AC networks, etc., can solve the problem of transmission power drop in faulty systems, failure to consider successive commutation, and poor economy of auxiliary equipment, etc. problem, to achieve the effect of fast and accurate control, convenient implementation and fast control

Active Publication Date: 2021-06-15
SICHUAN UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0059] However, the above method only performs reactive power compensation to suppress the commutation failure of the system from the prevention control of commutation failure and the post-commutation failure, which will cause a large drop in the transmission power of the faulty system, which is not conducive to system stability; and the auxiliary equipment for reactive power compensation The economy is poor, and the recovery process is complicated, the recovery time is slow, and the situation of successive commutation failures is not considered

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
  • A DC Power Control Method for Suppressing Multi-infeed DC Commutation Failure
  • A DC Power Control Method for Suppressing Multi-infeed DC Commutation Failure
  • A DC Power Control Method for Suppressing Multi-infeed DC Commutation Failure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0105] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0106] 1) build figure 1 The simplified model of the multi-infeed DC transmission system is shown. Two circuits of DC transmission lines are respectively fed into the receiving end system via BUS2 and BUS3, and there are two circuits of AC transmission system. The receiving end is the three-zone AC system, through the connection line L tie12 and L tie23 Coupled up. The receiving system includes generator G s1 , G s2 and G s3 , the AC system buses BUS1, BUS2 and BUS3 are respectively hung with loads Load1, Load2 and Load3. figure 1 middle, y N1 ,y N2 ,y N3 is the equivalent admittance corresponding to the connecting line of the generator at the sending end; E 1 ,E 2 ,E 3 ,E s1 ,E s2 ,E s3 is the equivalent electromotive force corresponding to the generator; U ac1 , U ac2 , U ac3 is the effective value of the bus line...

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 DC power control method for suppressing multi-infeed DC commutation failure. First, a simplified model of a multi-infeed DC transmission system is established, and then based on a sin-cos component detection and judgment method, the start of DC power control is judged, and then the DC power is determined. The power adjustment amount and the DC power control rate, and finally the DC power control is performed in different commutation failure scenarios according to the DC power adjustment amount and the DC power control rate. The control method of the present invention has fast and accurate control speed, is convenient to realize, has good control effect, does not need wide-area measurement data, has fast control speed, does not interfere with the operation of other equipment, does not require additional investment, and is economical.

Description

technical field [0001] The invention relates to the technical field of high-voltage direct current transmission, in particular to a direct current power control method for suppressing multi-infeed direct current commutation failures. Background technique [0002] Commutation failure is one of the most likely faults in DC transmission systems. In the converter, if the valve that exits conduction fails to recover the blocking ability during a period of time when the reverse voltage is applied, or the commutation process is not completed during the reverse voltage, when the valve voltage becomes positive, The commutated valve will commutate to the valve originally scheduled to withdraw from conduction. This situation is called commutation failure. [0003] The main reason for the commutation failure is that the AC system failure causes the commutation bus voltage on the inverter side to drop. Under certain conditions, some commutation failures can be automatically recovered, b...

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 Patents(China)
IPC IPC(8): H02J3/36H02J3/16
CPCH02J3/16H02J3/36H02J2203/20Y02E40/30Y02E60/60
Inventor 印月刘天琪江琴李保宏曾雪洋张英敏曾琦
Owner SICHUAN UNIV
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