Virtual synchronous machine seamless smooth switching method and system

A virtual synchronous motor and virtual synchronous machine technology, applied in circuit devices, AC network circuits, power transmission AC networks, etc., can solve the problems of excessive current impact of the power grid, affecting the safe and stable operation of the system, and achieve safe and stable operation. Effect

Active Publication Date: 2018-11-30
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
View PDF0 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When switching between PQ and VSG control modes, there may be a certain deviation between the output voltage amplitude and phase of the two control modes. If the output voltage, especially the phase, is not controlled, the power grid will Excessive current impact will be generated, which will affect the safe and stable operation of the system

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
  • Virtual synchronous machine seamless smooth switching method and system
  • Virtual synchronous machine seamless smooth switching method and system
  • Virtual synchronous machine seamless smooth switching method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The invention introduces the virtual synchronous motor technology into the control application of the converter station, forms a dual-mode control with the PQ control, realizes smooth switching between the PQ control and the VSG control through corresponding operations, and improves the stability and reliability of the system operation.

[0055] In the present invention, the converter station system based on PQ control and VSG control for smooth switching includes: a dual-mode converter station circuit system, a converter station control system and a three-phase power grid. The dual-mode converter station circuit mainly includes a DC power supply U DC , MMC (modular multilevel converter) module, three-phase filter, etc. The control circuit system of the converter station mainly includes the sampling unit (filter inductance L 1 current i on Labc , capacitor voltage u oabc ), control unit, PWM modulation and drive unit. The sampling signal of the sampling unit is firs...

Embodiment 2

[0092] Based on the same inventive concept, the present invention also provides a seamless and smooth switching system for a virtual synchronous motor in a flexible DC converter station, including:

[0093] The present invention also provides a seamless and smooth switching system for a virtual synchronous motor in a flexible DC converter station, including:

[0094] The first calculation module is used to calculate the current loop input reference value of the PQ control before the switching of the output side of the converter station;

[0095] The second calculation module is used to substitute the current loop input reference value of the PQ control into the pre-established circuit simulator model as an initial value, and calculate the current loop input reference value of the virtual synchronous machine technology VSG control;

[0096] The execution module is configured to execute a corresponding switching action according to a preset control switching instruction based on...

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 relates to a virtual synchronous machine seamless smooth switching method and system. A current loop input reference value controlled by PQ before switching on the output side of a converter station is calculated; the current loop input reference value controlled by the PQ is taken as an initial value and substituted into a pre-established circuit simulator model to calculate a current loop input reference value controlled by virtual synchronous machine technology (VSG); and based on the current loop input reference value controlled by the PQ and the current loop input referencevalue controlled by the virtual synchronous machine technology (VSG), a corresponding switching action is performed according to a pre-set control switching instruction. The virtual synchronous machine seamless smooth switching method and system applies PQ control and VSG control to a grid-connected dual-mode converter station control system, the deviation between the amplitude and phase of outputvoltage when switching between two control modes is eliminated through a designed simulator model and relevant operations, and smooth switching of control modes is realized.

Description

technical field [0001] The invention relates to the field of power transmission and distribution of electric power systems, in particular to a method and system for seamless and smooth switching of virtual synchronous motors. Background technique [0002] With the rapid consumption of traditional energy, the increasingly severe environmental pollution, and the rapid development of wind energy, solar energy and other new energy sources, the development and utilization of new energy sources have received more and more attention. At the same time, the flexible DC transmission technology based on the voltage source converter station has solved the problem of new energy grid connection, and the rapid development of power electronic devices has laid a good foundation for the flexible DC transmission technology, so the flexible DC transmission Technology is being used more and more widely. [0003] The power grid system based on flexible DC transmission mainly has two operation mo...

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): H02J3/44H02J3/36
CPCH02J3/36H02J3/44H02J2203/20Y02E60/60
Inventor 邱宇峰贺之渊王华锋林志光张海峰张见
Owner GLOBAL ENERGY INTERCONNECTION RES INST 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