Abstract
Voltage sags threaten the transient voltage stability of power systems. To evaluate the transient voltage stability, practical criteria based on voltage magnitude and sag duration are widely used in practical engineering. However, the applicability of practical criteria needs to be studied. In this paper, in a single-load system, a theoretical derivation was first made to obtain the transient voltage stability boundary. Then, by studying the relationship between the practical criteria and the stability boundary, the application scope of the practical criteria was determined. The application scope described in this paper can guide operators to use the practical criteria correctly and avoid misjudgment of the transient voltage stability as much as possible. Finally, a case study based on PSCAD/EMTDC is presented, and the simulation results verified the conclusions proposed in this paper.
Highlights
With the increase of load, the transient voltage stability of a power system will deteriorate gradually [1,2]
Among various transient voltage stability criteria, there is a class of practical criteria based on voltage magnitude and sag duration that are widely used in practical engineering
The transient voltage stability boundary based on voltage magnitude and sag duration was deduced theoretically
Summary
With the increase of load, the transient voltage stability of a power system will deteriorate gradually [1,2]. There are many methods to judge transient voltage stability, including time domain simulation, the direct method, and the intelligent algorithm. Data-driven intelligent algorithms are usually based on a large amount of accurate data, which requires a large-scale application of power management units. Among various transient voltage stability criteria, there is a class of practical criteria based on voltage magnitude and sag duration that are widely used in practical engineering. In addition to practical criteria, a transient voltage stability index was proposed [19], which considers both the voltage sag and the recovery. A variety of criteria have been proposed, the widely used transient voltage stability criteria in practical engineering are still the practical criteria based on voltage magnitude and sag duration.
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