Out-of-step protection system and method based on geometrical characteristics of movement locus of generator

Abstract

The invention relates to a loss of synchronism protection system and a method based on geometrical characteristics of movement locus of a generator. The loss of synchronism protection system comprises an information bus 2, and a global positioning system 1, a loss of synchronism protection device 6, a generator set power-angle and angular velocity synchronously measuring unit 5, a phase angle measuring unit 3 which are all connected to the information bus 2 by a remote communication unit 4, wherein the difference of data measured by the generator set power-angle and angular velocity synchronously measuring unit 5 is used as horizontal axis, the data measured by the generator set power-angle and angular velocity synchronously measuring unit 5 is used as vertical axis so as to form a phase plane, which rapidly judges the set loss of synchronism by utilizing the actual measured movement locus of the set according to the geometrical convex and concave characteristic change of the phase locus. The invention can provide the protection for a power plant when any set is in loss of synchronism, adapts to various operation modes and failure types of the power plant and an electric power system because the loss of synchronism detection accuracy and the sensitivity of the generator are unrelated with the specific structure of the power plant, has rapid loss of synchronism detection speed and simple structure, and is easy to implement.

Description

technical field [0001] The invention relates to an out-of-step protection scheme for a power system generator, in particular to an out-of-step protection system and method based on the geometric characteristics of the generator's motion track. Background technique [0002] The out-of-step protection of early generators is widely used to start the cut-off command by using the state variables that indirectly reflect the stability of the unit, such as apparent impedance, oscillation center voltage and its rate of change. This control method is simple and reliable; however, due to the complex nonlinear relationship between the setting of the starting threshold and various factors such as the wiring mode of the power grid, power flow conditions, fault modes and protection actions, the simple setting of the setting value can no longer adapt Changes in grid structure and operation. [0003] In the early 1990s, with the development of computer technology and communication technolog...

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Problems solved by technology

[0005] In order to overcome the above-mentioned defects in the prior art, the object of the present invention is to provide a system and method for out-of-step protection based on the geometric characteristics of the generator motion trajectory. Its action threshold is related to the operation mode of the system, and it is difficult to set the problem, and it can quickly detect out-of-step, and take early suppression measures to avoid oscillation out-of-step

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