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A Dimension-Reduced Observer for LCL Grid-connected Inverter Damping Control

A dimensionality reduction observer and damping control technology, which is applied in harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., and can solve problems such as system instability and control process interference.

Active Publication Date: 2016-08-24
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the embodiments of the present invention is to provide a dimensionality reduction observer for LCL grid-connected inverter damping control, aiming at solving the problem of high sampling channel inevitably introduced in the prior art due to the use of capacitive voltage or capacitive current sampling sensors. Subharmonics, which interfere with the control process and cause system instability and other problems

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  • A Dimension-Reduced Observer for LCL Grid-connected Inverter Damping Control
  • A Dimension-Reduced Observer for LCL Grid-connected Inverter Damping Control
  • A Dimension-Reduced Observer for LCL Grid-connected Inverter Damping Control

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[0077] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0078] The application principle of the present invention will be further described below with reference to the drawings and specific embodiments.

[0079] The present invention is realized in this way. A dimensionality reduction observer for LCL grid-connected inverter damping control includes: voltage state variable of the dimensionality reduction observer; current state variable of the dimensionality reduction observer; taking the voltage and current state variables as The state space equation of the variable observer; used to represent the observation error feedback matrix of the voltage and current state variables. ...

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Abstract

The invention relates to a dimension reduction observer used for LCL grid-connected inversion damping control. A voltage state variable of the dimension reduction observer is set, a current state variable of the dimension reduction observer is set, an observer state space equation with the voltage state variable and the current state variable as variables is set, and an observation error feedback matrix for representing the voltage state variable and the current state variable is set. Sensors for capacitor voltage or capacitor current sampling in the traditional controller are omitted, system resonance is further suppressed through feed-forward observed capacitor current, and reliability of the system is improved.

Description

Technical field [0001] The invention belongs to the technical fields of new energy power generation and grid connection technology, digital control technology, power electronic technology and motion control technology, and in particular relates to a dimension reduction observer for LCL grid connection inverter damping control. Background technique [0002] Intermittent power generation system supplements traditional power generation methods to meet the needs of the power market, and it is increasingly popularized as a clean energy power generation. The power electronic equipment connected to the power grid has increased, and the generator capacity and power plant (farm) scale of such systems have increased year by year. [0003] In order to improve the power quality of the new energy power generation system integrated into the grid and reduce the switching subharmonic content of the converter-type grid-connected system, large-capacity grid-connected LCL filters are mostly used in g...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 李隆基刘宝成唐庆华郗晓光满玉岩张弛王浩鸣李维博李琳
Owner STATE GRID CORP OF CHINA