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Method and system for controlling a DC link voltage of a power converter

A technology of power converter and link voltage, which is applied in the direction of output power conversion device, conversion of AC power input to AC power output, control of wind turbine, etc. It can solve problems such as unoptimized and difficult to meet power quality requirements, and achieve Improved Accuracy, Reduced Mechanical Oscillation, Effect of Accurate and Precise Control

Active Publication Date: 2012-08-15
INMONDA CO LTD
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  • Application Information

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Problems solved by technology

However, when this type of active damping control is applied by means of a dedicated wind turbine controller, power oscillations at the mechanical resonance frequency of the components of the drive chain are sent to the grid, which is affected during steady-state operating conditions and including ride-through grid faults The intermediate operating conditions of neither of these are preferred
This has the effect that it is difficult for the wind turbine operator to meet the power quality requirements given by the operator of the power grid receiving electrical power from the wind turbines

Method used

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  • Method and system for controlling a DC link voltage of a power converter
  • Method and system for controlling a DC link voltage of a power converter
  • Method and system for controlling a DC link voltage of a power converter

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Embodiment Construction

[0057] The illustrations in the figures are schematic. It is to be noted that in different figures similar or identical elements are provided with the same reference signs or with reference signs differing from the corresponding reference signs only in the first digit.

[0058] figure 1 A drive train attenuation controller 110 is shown which provides the attenuation power reference signal P being used by the various control systems representing embodiments of the invention described in this document DTD .

[0059] The drive chain attenuation controller 110 includes a high pass filter 112 which receives as input signal ω g The actual rotational speed of the rotor of the generator (also not depicted) of the wind turbine (not depicted). The actual rotational speed ω g It can eg be measured by means of an encoder and / or any type of speed / position observer and / or estimator.

[0060] According to the embodiment described here, the high-pass filter 112 is realized by a low-pass ...

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Abstract

It is described a method for controlling a DC link voltage of a power converter connecting an electric generator of a wind turbine with a power grid. The described method comprises (a) determining the rotational speed (e g ) of a rotor of the electric generator, (b) determining a strength of harmonic components of the rotational speed (e g ) of the rotor, wherein the harmonic components have frequency components being different from a fundamental rotational frequency of the electric generator, (c) determining a damping reference signal (PDTD , TDTD) as a function of the determined strength of the harmonic components, and (d) controlling the DC link voltage (VDC) of the power converter in response to the determined damping reference signal (PDTD , TDTD). It is further described a corresponding control system (200, 300, 400, 800, 900) and a computer program, which are configures for carrying out the above described control method.

Description

technical field [0001] The present invention generally relates to the technical field of operating wind turbines. In particular, the present invention relates generally to methods and systems for controlling the DC link voltage of a power converter connecting a generator of a wind turbine to a power grid. The invention also relates to a computer program for carrying out the described methods. Background technique [0002] Wind power generation has gained a major impetus due to growing demand for energy, depleting reserves of fossil fuels, and environmental benefits, especially with regard to greenhouse gas emissions. [0003] A wind turbine comprises: a drive train comprising all mechanical components which are connected upstream from a functional point of view with respect to a generator which is used to transfer the mechanical energy captured from the wind / power conversion into electrical energy / power that should be supplied to the grid. Important drive train component...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/18H02J3/01
CPCF03D7/0284H02M5/45Y02E10/72Y02E10/76
Inventor E.格伦达尔邓恒
Owner INMONDA CO LTD
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