Short-circuit current attenuation calculating method with consideration of dynamic load for power system

Abstract

The invention relates to a short-circuit current attenuation calculating method with consideration of a dynamic load for a power system. Dynamic and static loads are distributed appropriately according to reactive power requirements of the dynamic load, the electric potential attenuation of a generator and an electromotor is calculated through non-mutation principle of a flux linkage (electric potential) of the generator and the electromotor, the instant flux linkage (electric potential) before the short circuit of the generator and the electromotor serves as an initial value of the flux linkage attenuation calculation, and the short-circuit current attenuation with consideration of dynamic feature of the load is solved according to the attenuation of the flux linkage (electric potential) through writing circuit equation ( linear algebraic equations). The method can be used in research on short-circuit current attenuation features with consideration of the dynamic load, and the calculating result with consideration of the dynamic load is more accorded with the actual short-circuit current condition than the calculating result without consideration of the dynamic load.

Description

technical field [0001] The invention relates to a short-circuit current calculation method, in particular to a short-circuit current attenuation calculation method of a power system under dynamic load consideration. Background technique [0002] A short circuit is a serious failure of the power system. The short-circuit current of the power system includes short-circuit current periodic components and non-periodic components. The calculation of short-circuit current in the general sense (practical calculation of short-circuit current) mainly refers to the calculation of the periodic component of short-circuit current, and the calculation of short-circuit current in this specification also refers to the calculation of the periodic component of short-circuit current. [0003] According to the current calculation standard of short-circuit current, for the calculation of short-circuit current of the transmission network, the dynamic characteristics of the load can be ignored, t...

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Problems solved by technology

[0006] The present invention aims at the problem that the conventional short-circuit current calculation of the power system does not consider the dynamic load and the attenuation of the short-circuit current, which brings great potential safety hazards to the power system, and proposes a calculation of the attenuation of the short-circuit current of the power system under the consideration of the dynamic load. method, which is based on the principle that the flux linkage (potential) of the generator and the motor does not change suddenly, and the dynamic and static loads are properly distributed according to the reactive power requirements of the dynamic load. Obtain the short-circuit current attenuation considering the dynamic characteristics of the load, making the calculation result closer to the actual situation

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