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Method and device for suppressing broadband oscillation of converter

A converter, broadband technology

Pending Publication Date: 2022-02-25
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the large-scale new energy access system, the new energy base interacts with the DC transmission system and the weakly synchronous power grid, and there is strong coupling between the diversified power electronic devices and the motor, and there is sub / super synchronous oscillation phenomenon, which restricts the large-scale consumption of new energy
[0003] Taking the high-voltage direct current transmission system connected to new energy as an example, there are subsynchronous oscillation problems in high-voltage direct current transmission, wind turbines and turbogenerators

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  • Method and device for suppressing broadband oscillation of converter
  • Method and device for suppressing broadband oscillation of converter
  • Method and device for suppressing broadband oscillation of converter

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Embodiment Construction

[0039] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus their repeated descriptions will be omitted.

[0040] The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of these ...

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Abstract

The invention provides a method and a device for suppressing broadband oscillation of a converter. The method and the device are used for suppressing oscillation of a converter system in a broadband range. The method comprises the following steps of determining a frequency band range and an impedance control target value of a converter needing to suppress broadband oscillation according to the system requirement of the converter, calculating the broadband component of the AC bus voltage of the converter in the frequency band range, carrying out coordinate transformation on the broadband component of at least the AC bus voltage in the frequency band range, and then extracting broadband characteristic quantity transformed to a DC side, when the duration that the amplitude of the broadband component of the AC bus voltage in the frequency band range exceeds or is equal to a first starting threshold value is greater than or equal to a first time threshold value, enabling the broadband characteristic quantity to be subjected to a phase compensation link and / or a proportional link, superposing to a DC instruction value, a DC voltage instruction value or an active power instruction value of the converter, and outputting to modulate the DC, the DC voltage or the active power.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular, to a method and device for suppressing wide-band oscillation of a converter. Background technique [0002] In the large-scale new energy access system, the new energy base interacts with the DC transmission system and the weakly synchronous power grid, and there is strong coupling between the diversified power electronic devices and the motor, and there is sub / super synchronous oscillation phenomenon, which restricts the large-scale consumption of new energy . [0003] Taking the high-voltage direct current transmission system connected to new energy as an example, there are subsynchronous oscillation problems in high-voltage direct current transmission, wind turbines and turbogenerators. [0004] The traditional way to suppress subsynchronous oscillation is through additional damping controller (SSDC) in HVDC converter control. The design method is to design ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/36
CPCH02J3/241H02J3/36Y02E60/60
Inventor 卢东斌卢宇邹强
Owner NR ELECTRIC CO LTD