Unlock instant, AI-driven research and patent intelligence for your innovation.

A Realization Method of Bipolar Commutation Failure Protection

A technology of commutation failure and implementation method, which is applied in the field of bipolar commutation failure protection, can solve problems such as commutation failure of operating valve groups, achieve the effects of reducing power fluctuations, realizing bipolar fast blocking, and improving safe and reliable operation

Active Publication Date: 2018-02-13
XJ ELECTRIC +2
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The continuous commutation failure of a single bridge is generally caused by a problem with the trigger pulse, and the failure of the AC system will cause the commutation failure of all operating valve groups

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 Realization Method of Bipolar Commutation Failure Protection
  • A Realization Method of Bipolar Commutation Failure Protection
  • A Realization Method of Bipolar Commutation Failure Protection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0027] Embodiment of a method for realizing bipolar commutation failure protection of the present invention

[0028] The implementation method of the bipolar commutation failure protection in this embodiment first collects the three-phase currents on the star side and angle side of the converter transformer to obtain the corresponding IVY and IVD, and collects the high and low side outlet current IDCP of the valve group , IDCN, take the maximum value of the two as ID; then carry out the protection judgment logic according to the current signal adopted, judge whether commutation failure occurs, and start any bridge commutation failure after detecting any bridge commutation failure Phase failure counting logic, that is, whether the corresponding number of commutation failures occurs within the effective time window; if the condition is met, th...

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 relates to an implementing method for bipolar commutation failure protection and belongs to the technical field of extra-high voltage DC power transmission protection. The method comprises steps of: acquiring three-phase current of the star side and the angle side of a converter valve in order to obtain corresponding IVY and IVD, acquiring the high-side outlet current IDCP and low-side outlet current IDCN of a valve set, and using a maximum value of the IDCP and the IDCN as ID; performing protection determine logic according to an acquired current signal, determining whether commutation failure happens, and after it is determined that any bridge is subjected to commutation failure, starting any bridge commutation failure counting logic, namely whether corresponding number of commutation failure times happens in an valid time window; outputting an action signal to a control system if a condition is satisfied; if the control system detects that the local pole action signal and the opposite pole action signal satisfy the condition simultaneously, locking the local pole. The method may fast and accurately determine a fault, achieves fast bipolar locking, reduces power fluctuation to an AC power grid system, and improves the safe and reliable operation of the AC power grid system.

Description

technical field [0001] The invention relates to a method for realizing bipolar commutation failure protection, and belongs to the technical field of UHV DC transmission protection. Background technique [0002] UHV DC commutation failure protection is an important protection function in UHV DC transmission system, which detects commutation failure caused by AC system failure or abnormal valve control. The continuous commutation failure of a single bridge is generally caused by a problem with the trigger pulse, and the failure of the AC system will cause the commutation failure of all operating valve groups. The original commutation failure protection configures a single-bridge commutation failure section for commutation failure caused by trigger pulses; configures any bridge commutation failure fast section and slow section for AC system failures, and the protection logic and delay are mainly considered Cooperate with the maximum time for the AC system fault to clear. [0...

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): H02H7/26
Inventor 吴庆范黄金海吕鹏飞阮思烨许朋见李乾张爱玲
Owner XJ ELECTRIC