A voltage collapse event is complex and localized in nature, but its effect is extensive. A vital effect of voltage collapse is total system collapse or blackouts, which will result in a significant loss to utility companies. Online monitoring of power system stability has thus become an important factor for electric power utilities. The final resort prevent the occurrence of a voltage collapse...

BACKGROUND We identified dengue transmission areas by using the Geographic Information Systems located at local surveillance units of the Itaboraí municipality in state of Rio de Janeiro. We considered the association among the house infestation index, the disease incidence, and sociodemographic indicators during a prominent dengue outbreak in 2007 and 2008. METHODS In this ecological study, ...

Jaringan power listrik kapal untuk kegiatan operasional pelayaran memiliki karakteristik 3 phase 450 VAC 60 Hz, sumber diproduksi generator dengan kapasitas 562 KVA. Gangguan pada jaringan adalah undervoltage dan overvoltage, kondisi ini menyebabkan terjadinya voltage collapse atau blackout. Voltage tidak boleh terjadi sistem power, karena itu banyak penelitian terdahulu membahas berusaha menga...

Undervoltage load shedding (UVLS) is the last line of defense to ensure safe and stable operation power system. The existing UVLS technique has difficulty adapting generalizing new topology variation scenarios network, which greatly affects reliability control strategy. This paper proposes a emergency scheme based on graph deep reinforcement learning method named GraphSAGE-D3QN (graph sample ag...

A challenging problem facing AC-Quasi-Steady-State (AC-QSS) cascading failure models of power system is the divergence issue primarily stemming from voltage collapse phenomena. In reality, there are undervoltage load shedding (UVLS) relays, which aim to prevent such a by pre-specified fraction at buses where corresponding voltages fall below threshold. However, capturing UVLS action in QSS very...

In this paper, a novel method based on Hybrid Genetic Algorithm and Particle Swarm Optimization (HGAPSO) technique is proposed for solving Under Voltage Load Shedding (UVLS) problem. Load curtailment as ultimate control action is performed by under voltage load shedding scheme to guarantee power system voltage stability in contingency conditions. In addition, the proposed under voltage load she...

Load shedding is generally regarded as the final option to evade voltage collapse and blackout following major overloads. The traditional method of load curtails random loads regardless their importance until system’s improved. Shedding without considering priority will lead power interruption in vital infrastructures. Hence, improve existing system protection scheme, development a more effecti...

Under voltage load shedding (UVLS) and under frequency load shedding (UFLS) is plays vital role in the power system operation. As large disturbances are occur frequently in previous days. Generally these two methods are work independently from each other, and are not designed to integrated way to use their combined effect on load shedding. The reactive power hardly consider in load shedding pro...

<span lang="EN-US">Voltage stability represents one of the main issues in electrical power system. Under voltage load shedding (UVLS) has long been regarded as most successful techniques to prevent collapse. However, ordinary schemes do not consider different models and decreasing ‎economic cost that resulted from disconnection, so dual with reactive compensation are needed. Usually loads...

Power system blackouts have become a serious problem for electric utilities especially in recent years. Different forms of system instability have emerged in recent blackouts, such as voltage instability and frequency instability. To counteract each form of system instability, special algorithms have been designed in the protection system, e.g. Under Frequency Load Shedding (UFLS) and Under Vol...