Convertor station electrical signals-based subsynchronous oscillation monitoring analysis method

A sub-synchronous oscillation and electrical signal technology, applied to electrical components, AC network circuits, and AC network flicker reduction, etc., can solve the problem of inability to take active measures to prevent sub-synchronous oscillation, inability to grasp the torsional vibration of the shaft system, high sampling rate, etc. question

Active Publication Date: 2015-08-05
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

[0008] The problem with the above countermeasures is that the grid side cannot grasp the shaft torsional vibration status of each unit during dispatching operation, cannot predict the occurrence of subsynchronous oscillation, and cannot take active measures to prevent the occurrence of subsynchronous oscillation
However, the

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  • Convertor station electrical signals-based subsynchronous oscillation monitoring analysis method
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  • Convertor station electrical signals-based subsynchronous oscillation monitoring analysis method

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Embodiment Construction

[0067] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0068] A sub-synchronous oscillation monitoring and analysis method based on the electrical signal of the converter station proposed by the present invention can provide the sub-synchronous oscillation information of the DC near-area units to the dispatching operators, thereby judging which units are in a weak damping state, and adopting the adjustment operation mode and other measures to avoid the risk of subsynchronous oscillation.

[0069] like figure 1 As shown, the main steps of the subsynchronous oscillation monitoring ana...

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Abstract

The invention provides a convertor station electrical signals-based subsynchronous oscillation monitoring analysis method. The method includes the following steps that: step 1, acquiring and selecting appropriate converter station electrical signals x (k); and step 2, adopting a windowed interpolation FFT algorithm and an ESPRIT algorithm to identify the subsynchronous oscillation information of the electrical signals x (k). Compared with the prior art, and according to the convertor station electrical signals-based subsynchronous oscillation monitoring analysis method provided by the invention, the windowed interpolation FFT algorithm and the ESPRIT algorithm are applied to electrical signal analysis, and therefore, analysis precision can be improved; and monitoring and prevention of subsynchronous oscillation can be performed based on the method, so that the security and economical efficiency of the operation of a power grid and a unit can be improved.

Description

technical field [0001] The invention relates to a subsynchronous oscillation monitoring method, in particular to a subsynchronous oscillation monitoring and analysis method based on electrical signals of a converter station. Background technique [0002] At present, the capacity of the turbogenerator set is large, and the low-order torsional vibration frequency range of the shafting is generally between 10Hz and 40Hz. The actual power system is in a dynamic equilibrium state, and system disturbances may cause different amplitudes of the shafting of the unit subsynchronous torsional oscillations. Due to bearing friction, wind resistance and other reasons, the shafting mechanical system of the unit shaft system presents positive damping characteristics. If there is no series compensation, HVDC and other devices in the sending system of the unit, the sub-synchronous frequency complementary to the shafting sub-synchronous torsional vibration frequency generally oscillates in the...

Claims

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Application Information

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IPC IPC(8): H02J3/00G06F19/00
CPCG16Z99/00H02J3/00H02J3/002H02J2203/20
Inventor 周佩朋宋瑞华杜宁班连庚马世英项祖涛陈珍珍王晓彤郑彬韩彬张媛媛韩亚楠杨大业马其燕
Owner CHINA ELECTRIC POWER RES INST
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