Virtual synchronous control method and system of doubly-fed wind generating unit

A doubly-fed generator, virtual synchronization technology, applied in motor generator control, generator control circuit, control system, etc., can solve the problems of low reliability, limited ability to suppress unbalanced current, and low effectiveness.

Active Publication Date: 2020-09-11
CHINA ELECTRIC POWER RES INST
View PDF5 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing solution one is to add a fault detection module to the virtual synchronous control strategy of steady-state operation, and switch to the fault operation mode when the grid voltage unbalance fault occurs. The disadvantage of this solution is that additional faults are required The detection time and mode switching time have low rel

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 control method and system of doubly-fed wind generating unit
  • Virtual synchronous control method and system of doubly-fed wind generating unit
  • Virtual synchronous control method and system of doubly-fed wind generating unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1: as figure 1 As shown, a virtual synchronous control method of a doubly-fed wind power generating set provided by the present invention is applied to the doubly-fed wind power generating set under the condition of unbalanced grid voltage to balance the three-phase current at the grid connection point of the doubly-fed wind power generating set, including:

[0063] S1 acquires the stator voltage three-phase AC signal and the stator output current three-phase AC signal of the doubly-fed generator, and obtains the stator voltage command and the stator virtual synchronous angular frequency command of the doubly-fed generator through the improved virtual synchronous control;

[0064] S2 calculates the collected rotor rotational angular velocity of the doubly-fed generator and the stator virtual synchronous angular frequency command to obtain the positive-sequence slip angle and negative-sequence slip angle of the doubly-fed generator;

[0065] S3 performs posit...

Embodiment 2

[0162] Embodiment 2: Based on the same inventive concept, the present invention also provides a virtual synchronous control system for doubly-fed wind turbines, including:

[0163] The command generation module is used to obtain the stator voltage command and stator virtual synchronous angular frequency of the doubly-fed generator through the improved virtual synchronous control for the collected three-phase AC signal of the stator voltage and the three-phase AC signal of the stator output current of the doubly-fed generator instruction;

[0164] The positive and negative sequence slip angle module is used to calculate the collected rotor rotational angular velocity of the doubly-fed generator and the stator virtual synchronous angular frequency command to obtain the positive-sequence slip angle and negative-sequence slip angle of the doubly-fed generator ;

[0165] A generating module, configured to perform positive sequence control and negative sequence control based on the...

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 virtual synchronous control method and system of a doubly-fed wind generating unit. The method comprises the following steps: performing improved virtual synchronous controlon an acquired stator voltage three-phase alternating-current signal and a stator output current three-phase alternating-current signal of a doubly-fed generator to obtain a stator voltage instructionand a stator virtual synchronous angular frequency instruction of the doubly-fed generator; calculating the collected rotor rotation angular speed of the doubly-fed generator and the stator virtual synchronization angular frequency instruction to obtain a positive sequence slip angle and a negative sequence slip angle of the doubly-fed generator; and performing positive sequence control and negative sequence control based on the positive sequence slip angle, the negative sequence slip angle and the stator voltage instruction, and generating an SVPWM control signal of a doubly-fed generator rotor side converter switching tube. According to the method, the condition that three-phase imbalance occurs in stator end current under the unbalanced power grid voltage is considered, and the three-phase balance of the stator current is realized by adding the negative sequence control loop under the existing virtual synchronous control strategy.

Description

technical field [0001] The invention relates to the technical field of wind power generation conversion technology, in particular to a virtual synchronous control method and system for a doubly-fed wind power generating set. Background technique [0002] Wind energy has emerged as one of the most widely used renewable energy sources due to the rapid consumption of fossil fuels and growing concern for the environment. However, the renewable energy power generation system contains a large number of power electronic conversion devices. With the gradual increase of the penetration rate of renewable energy in the power distribution system, the power grid presents the characteristics of low inertia and weak damping, and the probability of grid voltage imbalance also increased substantially. In recent years, the idea of ​​virtual synchronization realized through the simulation of synchronous machine speed and exciter characteristics can meet the corresponding requirements, but the...

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): H02J3/38H02J3/46H02J3/26H02P9/00H02P21/00H02P101/15
CPCH02J3/26H02J3/381H02P9/007H02P21/0003H02P2101/15H02J3/466H02J2300/28Y02E40/50
Inventor 秦世耀王瑞明代林旺李少林张利毕然陈晨徐婷
Owner CHINA ELECTRIC POWER RES INST
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