Method and device for detecting stability of transient voltage of electric power system

Abstract

The invention relates to a method and a device for detecting stability of transient voltage of an electric power system. The method comprises the following steps of reading offline load parameters of a synthetic load model, wherein the offline load parameters include rotor impedance, stator impedance and excitation reactance of an equivalent motor and impedance of an equivalent static load; reading voltage at a load bus and active power at the load bus in real time; computing rotating speed of the equivalent motor at the next moment according to the offline load parameters, the active power at the load bus and the voltage at the load bus; computing recovery time of the rotating speed of the equivalent motor according to the offline load parameters, the rotating speed of the equivalent motor at the current moment and the rotating speed of the equivalent motor at the last moment; and determining stability parameters of the transient voltage according to the recovery time of the rotating speed of the equivalent motor. The method and the device put forward quantitative evaluation indexes for analysis of the stability of the transient voltage of the electric power system and have the advantages of simplicity, rapidity, high efficiency and the like.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a method and device for detecting transient voltage stability of a power system. Background technique [0002] Since the late 1980s, many voltage instability and even collapse accidents have occurred around the world, causing serious economic losses, making the voltage stability problem get more attention, and posing new challenges to the power system safety assessment. At present, the development of my country's energy and economy is extremely unbalanced, and my country's power grid has the main characteristics of large-capacity long-distance power transmission and large-scale receiving terminals, and the resulting voltage stability problems have become increasingly prominent. The detection of transient voltage stability of power system has always been an important factor related to the safe and stable operation of the power system. Therefore, the detection method of transient volt...

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Problems solved by technology

[0004] At present, most of the traditional transient voltage stability evaluation methods do not consider the impact of a large number of dynamic loads in the system on voltage stability, which deviates from the actual power grid operation and cannot truly detect the transient voltage stability.

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