Power grid regulation and control method and system for restraining low frequency oscillation

Abstract

The invention discloses a power grid regulation and control method and system for restraining low frequency oscillation. The method includes the steps that a state variable of a single-machine infinite bus system is acquired; the acquired state variable, a preset first weighting matrix, a preset second weighting matrix, a system state matrix and a system control matrix are converted into a transformation matrix through the following formula, wherein the system state matrix and the system control matrix correspond to the single-machine infinite bus system; the transformation matrix, the second weighting matrix and the state variable are converted into an optimum controlled variable; the optimum controlled variable is used as a feedback controlled variable to conduct feedback regulation and control over an infinite power grid. By the adoption of the method and system, the restraining efficiency of low frequency oscillation is improved, meanwhile, abrasion to power grid equipment can be lowered, so that optimum control is achieved, and the stability of an electric power system and the security of a generator set are effectively improved.

Description

technical field [0001] The present invention relates to the technical field of electric power, in particular to a power grid regulation method and system for suppressing low-frequency oscillations. Background technique [0002] The negative damping provided by the power system offsets the original positive damping of the system motor, excitation winding, machinery, etc., which will cause the total damping to be too small or negative. At this time, if the power system is disturbed, the disturbance will continue under the action of negative damping. Amplified to form low-frequency oscillations. Low-frequency oscillation will seriously affect the stability of the power system and the safe operation of the generator set, and even cause damage to the power system and lead to large-scale power outages. [0003] The function of the power system stabilizer on the side of the generator speed control system is to generate a positive damping torque through the control of the speed con...

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Problems solved by technology

[0005] Based on this, it is necessary to provide a power grid control method and system for suppressing low-frequency oscillations in view of the above-mentioned oscillation suppression method’s poor suppression effect on low-frequency oscillations, resulting in low stability of the power system and low safety of generator sets

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