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Device and method for stimulating subsynchronous oscillation of electric power system

A sub-synchronous oscillation and power system technology, applied in the direction of reducing/preventing power oscillation, can solve problems such as difficult control, complex system, strong destructive oscillation, etc., and achieve the effect of simple device implementation, clear physical concept and clear thinking

Active Publication Date: 2013-05-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the actual system is often more complex, even with the same fault type, the simulated system dynamic characteristics may be quite different from the actual system
In addition, in some cases, a small disturbance in the actual system will also cause subsynchronous oscillation of the related generator set. This oscillation may be divergent or convergent, but it will cause the shafting torsional vibration of the unit Fatigue, this kind of disturbance is often difficult to reproduce in simulation, and other measures need to be taken to simulate it; in field tests, it is necessary to check the effect of the suppression device by suppressing real oscillations, but real oscillations are often destructive and difficult to control

Method used

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  • Device and method for stimulating subsynchronous oscillation of electric power system
  • Device and method for stimulating subsynchronous oscillation of electric power system
  • Device and method for stimulating subsynchronous oscillation of electric power system

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Embodiment Construction

[0024] The preferred embodiments are described in detail below in conjunction with the drawings. It should be emphasized that the following description is only exemplary, and is not intended to limit the scope of the present invention and its application.

[0025] figure 1 It is a schematic diagram of the device oscillation excitation method for exciting the subsynchronous oscillation of the power system. figure 1 After the counter starts counting, the count value is taken as figure 2 The input of the piecewise linear function of the frequency signal generator forms the corresponding frequency increment output. The frequency increment varies from 0 to 0.5 Hz, which is relative to the reference frequency 0.5 Hz lower than the natural torsional vibration frequency of the generator shaft. The output after addition is figure 1 The input of the medium sine wave signal generator generates a sine disturbance of the corresponding frequency. According to the different piecewise function, ...

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Abstract

The invention discloses a device and a method for stimulating subsynchronous oscillation of an electric power system, and belongs to the field of stabilizing and controlling of the electric power system. The device comprises a counter, a time-variant frequency signal generator, a sinusoidal wave signal amplitude generator and a sinusoidal wave signal generator. The counter, the time-variant frequency signal generator and the sinusoidal wave signal generator are sequentially connected, and the sinusoidal wave signal amplitude generator is connected with the sinusoidal wave signal generator. The method includes: the step 1: the time-variant frequency signal generator generates subsynchronous frequency signals which change according to a set time-varying function; the step 2: the sinusoidal wave signal amplitude generator generates subsynchronous frequency sinusoidal wave signal amplitudes; the step 3: the sinusoidal wave signal generator receives the subsynchronous frequency signals and the subsynchronous frequency sinusoidal wave signal amplitudes, and generates subsynchronous frequency sinusoidal wave signals. By the device and the method, problems that actual oscillation has strong destructiveness and is difficult to control are solved, and effective measurements and methods are provided for actual devices for simulation analysis and subsynchronous oscillation.

Description

Technical field [0001] The invention belongs to the field of power system stability and control, and in particular relates to a device and method for exciting the subsynchronous oscillation of the power system. Background technique [0002] With the development of my country's economy, the demand for electricity has gradually increased. However, due to the reverse distribution of my country's energy distribution and economic development, long-distance transmission is inevitable. After the use of high-voltage large-capacity long-distance power transmission, power plants still have the problem of limited output power. Series capacitance compensation has been widely used as an economical and effective way to improve line transmission power and power system transient stability. However, this approach may cause subsynchronous resonance problems in the power system, threatening the safety of the unit shafting. In addition, with the continuous maturity and widespread use of high volta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 郭春林肖湘宁张剑杨琳许建庭
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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