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

Control method and controller for statcom output current at the end of torsional vibration machine

A technology of output current and control method, which is applied in the field of machine-end STATCOM output current control method and controller for suppressing torsional vibration, can solve problems such as poor torsional vibration effect, achieve the goal of alleviating torsional vibration, reducing power grid disturbance, and improving the effect Effect

Active Publication Date: 2022-07-22
NR ELECTRIC CO LTD +2
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is: to propose a control method and controller for the STATCOM output current at the machine end to suppress torsional vibration, to solve the problem that the existing STATCOM used for torsional vibration suppression does not participate in the adjustment of power frequency fundamental wave reactive current, and to improve the control link. Proportional resonance controller's poor effect of suppressing shaft torsional vibration

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
  • Control method and controller for statcom output current at the end of torsional vibration machine
  • Control method and controller for statcom output current at the end of torsional vibration machine
  • Control method and controller for statcom output current at the end of torsional vibration machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] like figure 1 Shown is the wiring diagram of the electrical equipment in the present invention. The STATCOM primary equipment is connected to the generator terminal bus through an isolation transformer, and the STATCOM controller is connected to the steam turbine generator set speed ω and generator terminal voltage u g , generator terminal current i g , STATCOM output current i s , STATCOM DC side voltage u dc and other signals; at the same time, the STATCOM controller also receives the external reactive power command Q * . In the figure, CT1 is the machine-end current transformer, PT is the machine-end voltage transformer, and CT2 is the STATCOM output current transformer. The grid system is equivalent to a two-circuit and infinite power system, one of which has capacitor series compensation, and the other The return line has no capacitor series compensation.

[0071] figure 2 Shown is a schematic diagram of the relationship between external signal acquisition a...

Embodiment 2

[0096] The wiring of electrical equipment in the method of the present invention is as follows: figure 1 As shown, the STATCOM primary equipment is connected to the generator terminal bus through an isolation transformer, and the STATCOM controller is connected to the turbo-generator set speed ω, generator terminal voltage u g , generator terminal current i g , STATCOM output current i s , STATCOM DC side voltage u dc and other signals; at the same time, the STATCOM controller also receives the external reactive power command Q * . In the figure, CT1 is the machine-end current transformer, PT is the machine-end voltage transformer, and CT2 is the STATCOM output current transformer. The grid system is equivalent to a two-circuit and infinite power system, one of which has capacitor series compensation, and the other The return line has no capacitor series compensation.

[0097] In this embodiment, the rated capacity of the generator is 667MVA, the rated voltage is 20kV, th...

Embodiment 3

[0129] Image 6 Shown is a schematic diagram of the relationship between external signal acquisition and internal calculation modules of the controller of the present invention. A specific embodiment of a machine-side STATCOM controller for suppressing torsional vibration of the present invention includes a power frequency current compensation calculation module and a current control inner loop module, and the power frequency current compensation calculation module calculates according to a given reference value of reactive power The power frequency current compensation value is obtained, and the power frequency current compensation value is input to the current control inner loop module to participate in the calculation of the modulated wave voltage reference value.

[0130] The above controller also includes a signal quantity measurement module, a modal current compensation calculation module, a DC voltage control outer loop module, and a pulse generation module; the power f...

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

A method for controlling the output current of a machine terminal STATCOM for suppressing torsional vibration, comprising a power frequency current compensation calculation link, a signal quantity measurement link, a modal current compensation calculation link, a current control inner loop link, a DC voltage control outer loop link, and a pulse generation link ; First calculate the power frequency current compensation value, modal control value, and DC current compensation value, then pass the three through the PIR controller of the current control inner loop to obtain the reference value of the modulated wave voltage, and finally generate the trigger pulse through the pulse generation module to control the STATCOM The on-off of the IGBT generates the required sub-synchronous / super-synchronous current, which is injected into the stator winding of the generator to generate an electromagnetic torque that suppresses torsional vibration. The invention also correspondingly provides a machine-end STATCOM controller for suppressing torsional vibration. This scheme makes STATCOM not only participate in the power frequency fundamental wave reactive current regulation, but also improves the characteristics of the original PR controller and the torsional vibration suppression effect, which is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of control of power electronic equipment of a power system, and in particular relates to a control method and a controller of a machine-end STATCOM output current for suppressing torsional vibration. Background technique [0002] When the power of the large-capacity turbine generator set is sent out, if the point-to-grid long-distance transmission mode is adopted, in order to improve the transmission power, the grid sometimes adopts capacitor series compensation, and sometimes adopts high-voltage direct current transmission. Theory and practice show that this kind of transmission mode is easy to cause the subsynchronous oscillation of the power grid and the torsional vibration of the shaft system of the steam turbine generator set. When subsynchronous oscillation occurs in the power grid, under the action of the interaction between the machine and the power grid, the rotors of the turbine generator set shaft...

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): H02J3/18H02J3/24
CPCH02J3/1885H02J3/24Y02E40/10
Inventor 张琦雪吴小丹王辉王凯马志恒朱信舜孙胜洪盛晓东王新宝王光陈俊
Owner NR ELECTRIC CO LTD
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