A power system damping stability domain and its determination method

Abstract

The invention discloses a damping stable region of an electric power system and a determining method thereof; and the determining method comprises a step of dividing the safe and stable operating range of the electric power system according to the size of key operating parameters when a characteristic root passes through a damping shaft, wherein the range within the boundary of the damping stableregion is the operating range of the key operating parameters which is in line with the safety standards of the low frequency oscillation and subsynchronous oscillation of the electric power system, i.e. the damping stable region. Compared with a small disturbance stable region formed by hopf branch points, the damping stable region provided by the invention is characterized in that a damping shaft, points of which are used for representing the characteristic roots with the same damping ratio, is used for replacing an imaginary shaft; traversing points of the damping shaft are solved to form the damping stable region; the damping stable region ensures that in the damping stable region, the characteristic roots of the low frequency oscillation and subsynchronous oscillation of the electricpower system can meet a certain damping ratio requirement; the damping stable region has very strong practical applicability and can be used for judging the adaptability of a damping controller of the electric power system; and after the damping controller is installed, the bigger the damping stability region is, the stronger the parameter adaptability of the controller is.

Description

technical field [0001] The invention relates to power system analysis and operation technology, in particular to a power system damping stability domain and a determination method thereof for judging the adaptability of a power system damping stabilizer to low-frequency oscillation and subsynchronous oscillation problems. Background technique [0002] Power system sub-synchronous oscillation (Sub-Synchronous Oscillation, SSO) refers to an abnormal operating state of the power system, in this state, the electrical system and the turbogenerator set at one or more frequencies lower than the system synchronous frequency Oscillating frequencies exchange significant energy. Long-term in this state will lead to the accumulation of fatigue and even fracture of the main shaft of the system generator set, which will seriously threaten the safe operation of the power system. [0003] Many scholars and power workers at home and abroad have done a lot of research and experiments on the ...

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Problems solved by technology

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a power system damping stability domain and its determination method. The electrical damping characteristics of subsynchronous oscillation are greatly affected by the operation mode of the power grid, which leads to subsynchronous oscillation damping control In order to solve the problem of poor adaptability of the controller, the damping stability domain is used as the evaluation criterion of the damping controller, and the related calculation method of the damping stability domain is given

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