Power grid system emergency control method and device

Abstract

The invention discloses a power grid emergency control method which is applicable to a power grid dispatching and control center provided with a wide area measuring system. The method comprises the following steps: utilizing unit transient state kinetic energy before and after failure to analyze interference degree of the unit; weighting the regulation of an electric distance meter in a failure center and the unit; considering an economy and influence factor via a unit important factor, and integrally obtaining unit controllable factors; and carrying out emergency switching operation according to the unit controllable factors in an order from big to small, and improving the efficiency and the validity of the power grid emergency control. In the invention, the efficiency and the real time performance of the emergency control to the power grid are further improved by simplifying power grid system topology, and validity of system transient state destabilization judgment is improved by adopting an energy changing tract geometrical transient state judgment method. The invention also discloses a power grid system emergency control device. Compared with the prior art, the emergency control method provided by the invention can achieve an accurate, reliable and efficient control effect.

Description

technical field [0001] The invention relates to an emergency control method for a power grid system, which is suitable for a power grid dispatching control center with a Wide Area Measurement System (WAMS). Background technique [0002] With the development of economy and technology, the scale of the power system is gradually increasing, and it is more likely to lose transient power angle stability due to large disturbances such as short-circuit faults. Various control measures need to be taken to restore stability. Among them, the cut-off control can change the inertia and kinetic energy of the cut-off node and reconstruct the power distribution in the system, which is one of the main measures for the transient power angle stability control of the power system. [0003] The cut-off control strategy needs to specify the cut-off time, cut-off location and cut-off amount. The cut-off time is set as the earliest control time allowed by the project, which generally depends on t...

AI Technical Summary

Problems solved by technology

This type of method relies on rapid modeling and analysis of the power grid after a fault, and the three major problems of fault type, stability analysis, and machine cut-off selection are coupled with each other, which further increases the complexity of calculation, poor timeliness, and low accuracy.

[0007] The large-scale interconnected power grid has a vast area and complex structure. When a fault occurs, it is impossible to quickly and effectively perform parameter reconstruction and stability simulation.

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