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Method and system for suppressing subsynchronous oscillation of thermal power unit

A technology of subsynchronous oscillation and thermal power unit, applied in the direction of reducing/preventing power oscillation, adjusting/eliminating/compensating reactive power, etc.

Active Publication Date: 2019-05-31
STATE GRID QINGHAI ELECTRIC POWER +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical solution of the present invention provides a method and system for suppressing subsynchronous oscillation of thermal power units to solve the problem of how to suppress subsynchronous oscillation of thermal power units

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  • Method and system for suppressing subsynchronous oscillation of thermal power unit
  • Method and system for suppressing subsynchronous oscillation of thermal power unit
  • Method and system for suppressing subsynchronous oscillation of thermal power unit

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Embodiment Construction

[0036] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0037] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...

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Abstract

The invention discloses a method and system for suppressing the subsynchronous oscillation of a thermal power unit. The method comprises a step of establishing a suppression controller including a static var generator (SVC) and an supplementary excitation damping controller (SEDC). The two controllers have a sum relationship in the aspect of subsynchronous oscillation suppression. The SVC has a good suppression capability, and the SEDC has low investment. On the one hand, the combination of the two controllers can reduce the capacity of the SVC and reduce the investment. On the other hand, theSEDC can be used when the SVC is overhauled. The method and system can decrease, when the subsynchronous oscillation occurs, the oscillation amplitude and delay the generator tripping protection actuation time, so that workers can take more time to adjust the operation mode of the system to eliminate the subsynchronous oscillation of the unit.

Description

technical field [0001] The invention relates to the technical field of suppressing subsynchronous oscillations of generator sets, and more specifically, to a method and system for suppressing subsynchronous oscillations of thermal power generating sets. Background technique [0002] The application of series compensation technology, high-voltage direct current transmission (HVDC) technology and large-scale new energy access in power systems may cause subsynchronous oscillation problems. Subsynchronous oscillation is a subsynchronous frequency electromechanical coupling oscillation phenomenon between the electrical system and the rotor mechanical system of the turbo-generator set, which will cause continuous or even increased torsional oscillation of the rotor shaft of the generator set, resulting in fatigue loss of the shaft system. In severe cases The damage to the shafting of the unit will be caused. If this problem cannot be properly resolved, on the one hand, it will po...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/18
CPCH02J3/24H02J3/18Y02E40/10
Inventor 马雪杜宁张祥成宋瑞华田旭姜红利李楠周佩朋陶昕杨大业彭飞刘飞陈雪侯胜林梁国勇车琰瑛
Owner STATE GRID QINGHAI ELECTRIC POWER
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