AC/DC hybrid microgrid coupled inverter cascade control implementation method

An AC-DC hybrid, inverter-level technology, applied in the field of smart grid, can solve the problems of difficult adjustment of control parameters of phase-locked loop controller, control performance affecting the performance of synchronous control algorithm, complexity, etc.

Active Publication Date: 2020-12-01
ZHENGZHOU UNIV
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional synchronous control strategies require complex phase-locked loop controllers to achieve power angle and frequency synchronization
The phase-locked loop controller

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
  • AC/DC hybrid microgrid coupled inverter cascade control implementation method
  • AC/DC hybrid microgrid coupled inverter cascade control implementation method
  • AC/DC hybrid microgrid coupled inverter cascade control implementation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0113] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0114] Such as figure 1 As shown, the AC-DC hybrid microgrid coupled inverter circuit system includes: three-phase full-bridge inverter, LCL filter, grid-connected switch, transmission line and AC bus. DG represents the AC-DC hybrid microgrid coupled inverter system; for the LCL filter, the resistance and inductance of the filter inductor on the inverter side are defined as R and L, respectively, the capacitance of the capacitor is defined as C, and the filter inductor on the grid side The resistance and inductance values ​​are defined as R g and L g . The grid-connected switch is a switch with a drive signal to trigger its turn-on and turn-off functions, and its turn-on and turn-off action time should be less than 5ms. The three-phase full-bridge inverter is connected to the AC bus through the transmission line after passing through the LCL filter and th...

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 an AC/DC hybrid microgrid coupled inverter cascade control implementation method, which comprises the steps of firstly designing a current vector control strategy, performingPark inverse transformation on an output result of the current vector control strategy, and performing space vector pulse width modulation to obtain a PWM wave for driving a three-phase inverter, wherein the current reference input of the current control loop is the output of the voltage control loop; secondly, designing a voltage vector control strategy, wherein voltage reference input of the voltage vector control strategy is output of the virtual impedance control loop; thirdly, designing a virtual impedance control loop, wherein the voltage reference input of the virtual impedance controlloop is the output of the virtual synchronous machine control loop; then, designing a virtual synchronous machine control loop; and finally, designing a grid-connected synchronous control loop, and closing a grid-connected switch when a grid-connected condition is met. According to the invention, the robustness of the controller to parameter disturbance and external disturbance and the system inertia and frequency stability of the AC-DC hybrid microgrid coupling inverter can be improved; and parallel operation of the AC-DC hybrid microgrid coupling inverter is realized, off-grid and grid-connected seamless switching can be realized, and the redundancy and reliability of the system are improved.

Description

technical field [0001] The invention relates to a method for realizing cascade control of coupled inverters in an AC / DC hybrid microgrid, and belongs to the technical field of smart grids. Background technique [0002] With the increase in the proportion of new energy access, AC-DC hybrid microgrid will be the trend of future grid development. AC / DC hybrid microgrid coupled inverters play a key role in integrating inverters to interface distributed generation units into microgrids. In order to improve the system inertia of the AC-DC hybrid microgrid coupled inverter to maintain the frequency stability of the AC side grid, a cascaded control structure is often used, including droop control loops, PI-based voltage control loops and current control loops. However, the traditional droop control has the disadvantages of poor frequency stability and difficulty in providing sufficient system inertia; the PI-based voltage and current double closed-loop control strategy has the disa...

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): H02J3/38H02J3/46
CPCH02J3/46
Inventor 李忠文程志平梁静司继凯张书源董亮辉王要强
Owner ZHENGZHOU UNIV
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