Method and device for testing low-frequency oscillation inhibition capability of power system stabilizer

一种电力系统、低频振荡的技术，应用在电力电子领域，能够解决无法有力证明振荡抑制性能、测试结果不准确、影响测试效率等问题

Active Publication Date: 2019-05-21
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
View PDF11 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method of changing the moment of inertia of the unit can easily adjust the oscillation frequency, it is necessary to re-adjust the relevant parameters of the power system stabilizer PSS after changing the moment of inertia of the unit each time. It takes time and affects the test efficiency. On the other hand, unauthorized modification of the PSS parameters of the power system stabilizer may cause abnormal output of the PSS of the power system stabilizer, resulting in inaccurate test results, and cannot effectively prove the oscillation suppression performance of the PSS of the power system stabilizer under test.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0039] see figure 1 , which is a schematic structural diagram of a simulation test platform for a test method for the ability of a power system stabilizer to suppress low-frequency oscillations provided by an embodiment of the present invention. The simulation test platform includes:

[0040] A single-machine infinite system model and an actual excitation control device; the single-machine infinite system model includes a generator under test, a transmission line a...

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 method and a device for testing the low-frequency oscillation inhibition capability of a power system stabilizer. According to the method, a linear relation between a power transmission line in a power system and an oscillation frequency generated by a tested generator is obtained; the length of the power transmission line is adjusted for a plurality of times; corresponding oscillation frequencies of the power transmission lines with different lengths in a low-frequency oscillation period and a damping ratio of the power system are calculated; and under the same frequency, the damping ratios corresponding to the state that the power system stabilizer is not put into use and the state that the power system stabilizer is put into use are compared and analyzed, and the low-frequency oscillation inhibition capability effect of the power system stabilizer is determined. According to the method, on the premise that any parameter of the generator and the matched power system stabilizer PSS is not changed, by adjusting the power transmission line in the power system, each frequency point in a test frequency band can be simulated, a real and credible test result iseffectively obtained for the low-frequency oscillation suppression capability of the tested power system stabilizer PSS, and the test efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a test method for the ability of a power system stabilizer to suppress low-frequency oscillations. Background technique [0002] With the continuous expansion of the scale of the power grid and the increasingly complex structure (interconnection of AC and DC lines, and the increase of long-distance power transmission lines), low-frequency oscillation events of 0.2-2.5 Hz in the power system occur from time to time, and low-frequency oscillations will affect the voltage and frequency of the power system. In severe cases, it will cause out-of-synchronization of grid-connected units, which is one of the key issues that threaten the safe and stable operation of the power system. Power system stabilizer PSS is currently the most mature and effective means of suppressing low-frequency oscillations, and is widely used in all levels of power grids. Its principle is to increase ...

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): G01R31/00
Inventor 顾浩瀚袁艺李书勇
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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