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

A control method, device, equipment and medium of an Lcl type grid-connected inverter

A control method and inverter technology, which can be applied to output power conversion devices, irreversible DC power input conversion to AC power output, single-grid parallel feeding arrangements, etc., can solve the impact of system stability, reduce LCL type The stability margin of the grid-connected inverter, there is no more effective solution, etc., to achieve the effect of improving the stability

Active Publication Date: 2021-10-22
SHENZHEN INVT ELECTRIC
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the grid voltage feed-forward control strategy is introduced in a weak grid, it will usually reduce the stability margin of the LCL grid-connected inverter and affect the stability of the system
At present, there is no effective solution to this technical problem

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
  • A control method, device, equipment and medium of an Lcl type grid-connected inverter
  • A control method, device, equipment and medium of an Lcl type grid-connected inverter
  • A control method, device, equipment and medium of an Lcl type grid-connected inverter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0047] See figure 1 , figure 1 It is a flow chart of a control method for an LCL type grid-connected inverter provided by an embodiment of the present invention; the control method includes:

[0048] Step S11: Obtain the DC bus voltage at the input side of the LCL grid-connected inverter, the inverter side current of the LCL grid-connected inverter, and the capacitor voltage of the LCL grid-connected inverter;

[0049] Step S12: Observing the grid current at...

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 present application discloses a control method of an LCL type grid-connected inverter, which includes: respectively obtaining the DC bus voltage at the input side of the LCL type grid-connected inverter, the inverter side current of the LCL type grid-connected inverter, and the LCL type grid-connected inverter. The capacitor voltage of the grid-connected inverter; use the reduced-dimensional current observer to observe the grid current at the output side of the LCL type grid-connected inverter, and construct a gain feedback matrix to feed back the target state variable; input the capacitor voltage to the high-pass filter, and Obtain the capacitor voltage damping feedback output by the high-pass filter; compare the DC bus voltage with the expected DC bus voltage to obtain the voltage regulation value; input the capacitor voltage damping feedback value, target state variable and voltage regulation value to the voltage controller , to use the target control signal output by the voltage controller to control the LCL grid-connected inverter, so that the stability of the LCL grid-connected inverter during operation can be significantly improved.

Description

technical field [0001] The invention relates to the technical field of grid-connected inverters, in particular to a control method, device, equipment and medium for an LCL type grid-connected inverter. Background technique [0002] Compared with the L-type grid-connected inverter, the LCL-type grid-connected inverter can more effectively suppress the higher harmonics output by the inverter. Therefore, the actual application of the LCL-type grid-connected inverter has been more widely used. However, due to the inherent resonance point of the LCL type grid-connected inverter, it is easy to cause resonance phenomenon under the condition of harmonic excitation. In this situation, in order to enhance the anti-disturbance ability of the LCL grid-connected inverter, the grid voltage feedforward control strategy is generally used to suppress the impact of grid voltage fluctuations and harmonic excitation on the LCL grid-connected inverter. However, if the grid voltage feed-forward...

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): H02M7/48H02M1/44H02J3/38
CPCH02J3/38H02M1/44H02M7/48H02M1/0038H02M7/4815Y02B70/10
Inventor 吴轩钦董瑞勇李建龙沈文王二峰
Owner SHENZHEN INVT ELECTRIC
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