Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

PSS (power system stabilizer) negative damping detection method

A detection method and negative damping technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as lack of strict theoretical basis

Active Publication Date: 2016-11-02
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The limitation of this method is: in a certain oscillation mode, judging whether the PSS damping is positive or negative needs to compare the oscillation waveforms when PSS is put in and out.
[0009] The limitation of this method is that the similarity comparison method used to detect the PSS negative damping of a certain generator lacks strict theoretical basis

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
  • PSS (power system stabilizer) negative damping detection method
  • PSS (power system stabilizer) negative damping detection method
  • PSS (power system stabilizer) negative damping detection method

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0118] The PSS negative damping detection method shown (such as Picture 8 Shown), the specific detection method steps are:

[0119] Step 1: Obtain the excitation voltage u of the generator under the rated working condition of the generator fN And excitation current i fN , And calculate the field winding resistance Obtain the excitation voltage u during generator oscillation f , Excitation current i f , Generator terminal voltage V t And PSS output additional excitation reference voltage V S ;

[0120] Step 2: Calculate the flux linkage differential during generator oscillation

[0121] Step three, right u f , I f , V t , V S , Perform identification to obtain the excitation voltage amplitude Δu in the main mode fm , Attenuation factor σ uf , Frequency f uf , The initial phase α; obtain the excitation current amplitude Δi in the main mode fm , Attenuation factor σ if , Frequency f if , The initial phase β; obtain the terminal voltage amplitude ΔV in the main mode tm , Attenuat...

specific Embodiment 2

[0156] On the basis of specific embodiment 1, the method steps further include calculating the oscillation energy, and when the PSS is used, the excitation system injects the oscillation energy When PSS exits, the estimated excitation current is Set the excitation system to inject oscillating energy when PSS exits Compare U ex And U ex0 The size if U ex ex0 Then PSS produces positive damping; if U ex > U ex0 Then the PSS produces negative damping.

[0157] In this specific embodiment, U ex = -0.0739, U ex0 =1.7478

specific Embodiment 3

[0158] The difference with the specific examples 1 and 2 is that instead of using the drawing method for judgment, the excitation system injected oscillation energy when the PSS is turned on and the excitation system injected oscillating energy when the PSS is withdrawn are compared to make accurate and detailed judgments of PSS generation Whether it is positive or negative damping, so as to detect the negative damping of the PSS.

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 PSS (power system stabilizer) negative damping detection method. According to the PSS negative damping detection method, intuitive judgment of PSS positive and negative damping can be realized according to a graphical method on the basis of vector analysis, so as to realize detection of the PSS negative damping, or whether damping generated by a PSS is positive damping or negative damping can be judged more accurately and minutely by further comparing oscillation energy injected by an excitation system when the PSS is powered on with oscillation energy injected by the excitation system when the PSS is powered off, so as to detect the PSS negative damping for detection of the PSS negative damping, or whether damping generated by the PSS is positive damping or negative damping can be judged accurately and minutely by directly comparing the oscillation energy injected by the excitation system when the PSS is powered on with the oscillation energy injected by the excitation system when the PSS is powered off. The PSS negative damping detection method can be used for detecting whether the PSS of a generator generates negative damping for a certain oscillation mode or not, and switching of working conditions is not needed during detection.

Description

Technical field [0001] The invention relates to a PSS negative damping detection method, in particular to a PSS negative damping detection method suitable for the technical field of power system stability control. Background technique [0002] Low frequency oscillation is one of the major problems that threaten modern power systems. When low-frequency oscillation occurs, the voltage, power, and frequency in the system will oscillate, which will seriously affect the operation of the system. Power System Stabilizer (PSS) is the most widely used low-frequency oscillation suppression device. By feeding back the generator speed, frequency, electromagnetic power and other signals, filtering, amplifying, phase compensation, etc., an additional excitation reference signal is generated to act on the excitation device to change the excitation voltage and then the electromagnetic power of the generator, so that the generator rotor A positive damping torque is produced on the upper side, w...

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): G01R31/00G01R31/34
CPCG01R31/00G01R31/34G01R31/343G01R31/346
Inventor 杨毅强吴浩李兆飞
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap 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