Dimension reduction observer design method based on grid-connected LCL filter system

A technology of dimension reduction observer and design method, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, AC network circuits, etc., and can solve problems such as system instability and control process interference.

Inactive Publication Date: 2016-03-30
STATE GRID TIANJIN ELECTRIC POWER +1
View PDF3 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the embodiments of the present invention is to provide a design method for a dimensionality reduction observer based on a grid-connected LCL filter system, which aims to solve the problem of the high samplin

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
  • Dimension reduction observer design method based on grid-connected LCL filter system
  • Dimension reduction observer design method based on grid-connected LCL filter system
  • Dimension reduction observer design method based on grid-connected LCL filter system

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0113] According to the dimensionality reduction observer method for grid-connected inverter proposed by the present invention, the observability of the system should be judged before specific parameter design. It can be seen from the description and analysis of the state space of the LCL filter system that the system state matrix is:

[0114] A o = 0 ω - 1 / C 0 1 / C 0 - ω 0 0 ...

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 dimension reduction observer design method based on a grid-connected LCL filter system. An active damping control method based on a state observer is disclosed. Through feedforward, a capacitance current is observed so as to restrain a system resonance. For a completely observable system, a system can be reconstructed, a variable which can be directly measured in an original system, such as an input quantity and an output quantity, is used and taken as an input signal so that the output quantity is equivalent to a state variable of the original system under a certain index. After observability analysis is performed on the grid-connected LCL filter system and the system is demonstrated to be the completely observable system, through the input quantity and the output quantity of the LCL filter system, the system state variable is estimated so that purposes of saving an additional sensor and increasing system reliability are reached. In the invention, an LCL grid-connected inverter based on a dimension reduction observation method can effectively carry out grid connection on an intermittent power generation system, active and reactive power control is performed on a network-access current, and simultaneously and more importantly, a harmonic current can be reduced.

Description

technical field [0001] The invention belongs to the fields of new energy power generation and grid-connected technology, digital control technology, power electronics technology and motion control technology, and in particular relates to a design method for a dimensionality reduction observer based on a grid-connected LCL filter system. Background technique [0002] The intermittent power generation system supplements the traditional power generation method to meet the demand of the power market, and it is also becoming more and more mature as a clean energy power generation. The power electronic equipment connected to the power grid is increasing, and the generator capacity and power plant (field) scale of such systems are increasing year by year. [0003] In order to improve the quality of electric energy integrated into the grid by new energy power generation systems and reduce the switching subharmonic content of converter-type grid-connected systems, large-capacity grid...

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): H02J3/01H02J3/38
CPCH02J3/01H02J3/381Y02E40/40
Inventor 张磐项添春宋国旺郄伟李德强司威纪明苏靖宇
Owner STATE GRID TIANJIN ELECTRIC POWER
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