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Method for damping control of LCL grid-connected inverter based on dimension reduction observation

A dimensionality reduction observer and damping control technology, which is applied in the direction of harmonic reduction device, single-network parallel feeding arrangement, output power conversion device, etc., can solve problems such as system instability and control process interference

Active Publication Date: 2014-08-13
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0014] The purpose of the present invention is to provide a damping control method for LCL grid-connected inverters based on dimensionality reduction observation, aiming to solve the problem of the high-order harmonics in the sampling channel that are inevitably introduced in the prior art due to the use of capacitive voltage or capacitive current sampling sensors. Waves, which interfere with the control process and cause system instability and other problems

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  • Method for damping control of LCL grid-connected inverter based on dimension reduction observation
  • Method for damping control of LCL grid-connected inverter based on dimension reduction observation
  • Method for damping control of LCL grid-connected inverter based on dimension reduction observation

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[0061] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0062] Such as Figure 7 As shown, the present invention provides a method for damping control of LCL grid-connected inverters based on dimensionality reduction observation, the method comprising:

[0063] Establish the single-phase system differential equation of the grid-connected LCL filter;

[0064] Decompose the system equations into non-reconfigurable subsystems and subsystems that need to be reconfigured;

[0065] Solve the characteristic polynomial of the reconstructed subsystem;

[0066] Design dimensionality reduction observers for refactoring subsystems;

[0067] Solve the characteri...

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Abstract

The invention discloses a method for damping control of an LCL grid-connected inverter based on dimension reduction observation. The method includes the steps that a single-phase system differential equation of a grid-connected LCL filter is established; the system equation is decomposed into a subsystem without reconstruction and a subsystem needing reconstruction; a characteristic polynomial for the reconstruction subsystem is solved; a dimension reduction observer for the reconstruction subsystem is designed; a characteristic equation of the dimension reduction observer is solved. According to the method for damping control, a sensor for sampling capacitor voltages or capacitor currents in a traditional control method is omitted, the capacitor currents are observed through feed-forward, and then system resonance is restrained and system reliability is improved.

Description

technical field [0001] The invention belongs to the technical 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 damping control method for an LCL grid-connected inverter based on dimensionality reduction observation. 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, lar...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01H02M1/12
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
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