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

An Optimization Method for Zero-Sequence Overvoltage Protection Logic of Converter

A technology of zero-sequence overvoltage and protection logic, which is applied to emergency protection circuit devices, electrical components, etc., can solve the problem that the zero-sequence overvoltage protection system cannot quickly eliminate faults, and achieve the effect of avoiding damage

Active Publication Date: 2019-03-12
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for optimizing the zero-sequence overvoltage protection logic of a converter to solve the problem that the zero-sequence overvoltage protection system cannot quickly eliminate faults when the converter is unlocked

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
  • An Optimization Method for Zero-Sequence Overvoltage Protection Logic of Converter
  • An Optimization Method for Zero-Sequence Overvoltage Protection Logic of Converter
  • An Optimization Method for Zero-Sequence Overvoltage Protection Logic of Converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In conjunction with embodiment one, embodiment two of the present invention is as figure 2 As shown, step S101 includes the following steps:

[0042] Step S201, judging whether the AC incoming circuit breaker is in the closing state.

[0043] When the AC incoming circuit breaker is in the closed state, the converter may be in the locked state or in the unlocked state. At this time, it is necessary to further judge the DC current of the converter to determine the current current of the converter. Operating status.

[0044] Step S202, if the AC incoming circuit breaker is in the closed state, it is judged whether the DC current of the converter is zero.

[0045] Step S203, if the DC current of the converter is zero, the converter is in a locked state.

[0046] Step S204, if the DC current of the converter is not zero, then judge whether the DC current of the converter is greater than or equal to the minimum unlocking current.

[0047] Step S205, if the DC current of th...

Embodiment 2

[0049] In conjunction with embodiment two, embodiment three of the present invention is as image 3 As shown, the converter is in a locked state, then the method further includes:

[0050] Step S301, acquiring the zero-sequence overvoltage protection status of the converter, the zero-sequence overvoltage protection status including whether the zero-sequence voltage exceeds a fixed value, whether the zero-sequence overvoltage protection is enabled, and whether the trigger pulse is enabled.

[0051] Step S302, judging whether the zero-sequence voltage exceeds a fixed value, the zero-sequence overvoltage protection is enabled, and the trigger pulse is enabled at the same time.

[0052] Step S303, if the zero-sequence voltage exceeds a fixed value, the zero-sequence overvoltage protection is enabled, and the trigger pulse is enabled at the same time, the first logic module sends the first-stage protection instruction, and the DC protection system according to the first-stage prote...

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 an optimization method of zero-sequence over-voltage protection logic of a converter. According to optimized protection logic, zero-sequence over-voltage protection of the converter is divided into two stages; when the converter is in a locked state, a first logic module sends a first-stage protection instruction, and a direct-current protection system controls a first-stage exit to perform a protection action according to the first-stage protection instruction; when the converter is in an unlocked state, a second logic module sends a second-stage protection instruction, and the direct-current protection system controls a second-stage exit to perform a protection action according to the second-stage protection instruction. In unlocking of the converter, if resonance occurs between a voltage-dividing capacitor of an end screen voltage transformer and a secondary PT inductor of a protection panel on the converter valve side, the protection action performed by the second-stage exit can remind an operator that the valve-side voltage is abnormal and the operator should remove the fault as soon as possible, so that overvoltage damage of a voltage-dependent resistor or the voltage-dividing capacitor is avoided, and safe and stable operation of a direct-current transmission system is promoted.

Description

technical field [0001] The invention relates to the technical field of control and protection of DC transmission systems, in particular to an optimization method for zero-sequence overvoltage protection logic of a converter. Background technique [0002] In order to avoid serious damage to the DC equipment, the DC transmission system is equipped with a DC protection system. When the high-voltage DC system or equipment fails, the DC protection system will calculate and judge the type of fault according to the set protection value, and exit according to the set action setting value to quickly and reliably remove the fault, so as to realize the protection of high-voltage DC equipment , to ensure the safe and stable operation of the DC transmission system. [0003] Figure 6 It is the circuit diagram of the measurement circuit of the final screen voltage transformer commonly used in DC transmission projects, including the final screen voltage transformer and DC protection scree...

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
CPCH02H7/268
Inventor 邢超李胜男刘明群陈勇覃日升赵勇帅何思远李俊鹏袁明
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com