Device and method for stimulating subsynchronous oscillation of electric power system

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...

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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

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