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

Ferroresonant Overvoltage Adaptive Control System and Its Control Method

A technology of self-adaptive control and ferromagnetic resonance, applied in the field of simulation test, can solve the problems of cutting device system impact disturbance, too small damping, and no suppression effect of arrester, etc., and achieve the effect of alleviating the degree of pressure loss and good suppression effect

Inactive Publication Date: 2016-11-02
CHONGQING UNIV +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has limitations in application: After putting in a capacitor, the relative ground capacitance can be increased, and excessive capacitance may cause overcurrent
There are limitations in the application of this method: ①The adaptability of the device to different modes of resonance is not strong, and the identification accuracy of the mode or frequency is high; ②There is a contradiction in the selection of the resistance value of the device, in order to achieve a more ideal resonance Effect, the damping resistance should be as small as possible, but if the damping is too small, the cutting device will cause a large impact disturbance to the system, which will cause the second resonance and cause the device to start multiple times
This method has limitations in application: for the periodic resonance of lower amplitude, the arrester has almost no suppression effect

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
  • Ferroresonant Overvoltage Adaptive Control System and Its Control Method
  • Ferroresonant Overvoltage Adaptive Control System and Its Control Method
  • Ferroresonant Overvoltage Adaptive Control System and Its Control Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The effective value of the power supply voltage E = 15V, the equalizing capacitor C 1 =119μF, capacitance C to ground 2 = 25μF, pulse power frequency f = 1kHz, duty cycle D = 75%, damping resistance R = 51Ω, PSCAD simulation results are as follows image 3 , it can be seen from the figure that this system parameter corresponds to the fundamental frequency ferromagnetic resonance, the switch BRK is disconnected at 0.2s, and then the voltage on PT goes through a transient transition process of about 0.1s, and finally presents a stable fundamental frequency Resonant overvoltage; when the steady-state ferromagnetic resonance is maintained for 0.8s, the control module is connected to the secondary side of the PT, and the overvoltage on the PT is controlled after a transient decay transition process of about 0.15s. Figure 4 It is the phase space trajectory of the fundamental frequency ferromagnetic resonance control process. It can be seen that the voltage and PT flux linka...

Embodiment 2

[0059] The effective value of the power supply voltage E = 15V, the equalizing capacitor C 1 =800μF, capacitance C to ground 2 = 200μF, pulse power frequency f = 1kHz, duty cycle D = 21%, damping resistance R = 5Ω, PSCAD simulation results are as follows Figure 5 , as can be seen from the figure, this system parameter corresponds to the frequency division ferromagnetic resonance, the switch BRK is disconnected at 0.2s, and then the voltage on PT goes through a transient transition process of about 0.05s, and finally presents a stable frequency division Resonant overvoltage; when the steady-state ferromagnetic resonance is maintained for 0.8s, the control module is connected to the secondary side of the PT, and the overvoltage on the PT is controlled after a transient decay transition process of about 0.1s. Image 6 It is the phase space trajectory of the frequency division ferromagnetic resonance control process. It can also be seen that the voltage on the PT and the PT flux...

Embodiment 3

[0061] The effective value of the power supply voltage E = 15V, the equalizing capacitor C 1 =2000μF, capacitance C to ground 2 =500μF, pulse power frequency f=1kHz, duty cycle D=19%, damping resistance R=5Ω, PSCAD simulation results are as follows Figure 7 , as can be seen from the figure, this system parameter corresponds to the quasi-periodic ferromagnetic resonance, the switch BRK is disconnected at 0.2s, and then the voltage on PT goes through a transient transition process of about 0.03s, and finally presents a stable frequency division Resonant overvoltage; when the steady-state ferromagnetic resonance is maintained for 0.8s, the control module is connected to the secondary side of the PT, and the overvoltage on the PT is controlled after a transient decay transition process of about 0.1s. Figure 8 The phase space trajectory of the quasi-periodic ferromagnetic resonance control process can also be seen from the time-varying trajectory of the voltage and PT flux linka...

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 belongs to the technical field of simulation tests of a control method, and particularly relates to a ferromagnetic resonance overvoltage adaptive control system and method. The control system comprises an overvoltage on-line monitoring unit, a decision-making unit, a bidirectional thyristor and damping resistor unit and a control switch unit. The control method comprises the following steps that a voltage-to-ground signal on the secondary side of a PT is monitored online, the type of ferromagnetic resonance is judged, a damping resistor to be switched in is determined, the duty ratio of a square wave generated by a square wave generator is adjusted according to the difference between a reference voltage and the voltage-to-ground signal on the secondary side of the PT, and switch-in and cut-out of the damping resistor are controlled. Compared with the prior art, the control system and method have the advantages that an overcurrent will be generated, ferromagnetic resonance overvoltages in different modes can be well restrained, a selection contradiction of the value of resistance of the damping resistor does not exist, low-amplitude periodic ferromagnetic resonance can be well restrained, and a better restraining effect can be achieved compared with an existing ferromagnetic resonance restraining method.

Description

technical field [0001] The invention belongs to the technical field of simulation experiments of control methods, and in particular relates to a ferromagnetic resonance overvoltage adaptive control system and a control method thereof. Background technique [0002] Ferromagnetic resonance is a nonlinear resonance phenomenon developed on the basis of capacitive and inductive components of power system. It is a complex problem that has long plagued the safety of substations. Due to the long duration and high oscillation amplitude of resonance overvoltage, and the existing resonance protection measures have certain limitations, resonance overvoltage poses a great threat to the safe operation of the power system. At the same time, with the rapid development of the economy and society and the wide application of communication, information and other technologies, intelligence has become a new trend in the development of my country's power grid, which requires the power grid to have...

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): H02H9/04
Inventor 杨庆杨鸣司马文霞邹密袁涛
Owner CHONGQING UNIV
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