Loss of load probability evaluation based on real-time emergency dispatch

Abstract

The Loss of Load Probability (LOLP) represents an important index in the reliability evaluation of electric power systems. The LOLP denotes the probability of customer demand curtailments due to random outages of various system components. This paper presents a combined optimization/reliability technique in which the system control parameters are optimized. This simulates practical contingency situations where suitable controls are invoked in order to preserve, as much as possible, the continuity of supply. A DC representation of the power network is used and the optimization problem is solved by linear programming. The active component of the net injected power and the voltage angles at all buses represent the optimization variables of the problem. The optimal solution maximizes the load power supplied subject to the power flow equations as well as upper and lower bounds on the optimization variables. This paper also includes a description of the computerized algorithm developed and numerical results for a test power system. La perte de probabilité de charge représente un indice important dans l'évaluation de la fiabilité des systèmes à courant électrique. La PPC dénote la probabilité de réductions de la demande des clients occasionnées par des pannes aléatoires de divers éléments du système. Cet exposé présente une technique combinée par optimisation/fiabilité qui optimise les paramètres de contrôle du système pour simuler les situations imprévisibles pratiques dans lesquelles les contrôles convenables préservent, dans la mesure du possible, la continuité de l'approvisionnement. On utilise une représentation en CC du réseau d'approvisionnement et le problème d'optimisation est résolu par programmation linéaire. L'élément actif de la puissance nette injectée et les angles de tension à tous les circuits communs représentent les variables d'optimisation du problème. La solution optimale porte au maximum le courant de charge fourni sous réserve des équations de débit de courant, ainsi que les limites maximales et minimales sur les variables d'optimisation. Cet exposé comprend une description de l'algorithme informatisé ainsi mis au point et des résultats numériques pour un système de courant de test.

Novel assessment of power system reserve-based on the reliability and quality levels

“…*Maintaining a continuous and sufficient power supply to the customers at a reasonable cost is the prime objective of electric power companies around the world. In this regard, power system costeffectiveness, security, adequacy, and reliability analyses have become a significant concern in today's highly-competitive business environment of power utility planning and operations (Zhao et al, 2009;El-Kady et al, 1985;1986). In a recent paper by the authors (El-Kady and Alshammari, 2011), a novel framework was developed and applied for assessment of reliability and quality performance levels in real-life power systems with practical largescale sizes.…”

Evaluation of power system reliability levels for (n-1) outage contingency

“…In addition, the electric power utilities have a key mandate to maintain a continuous and sufficient power supply to the customers at a reasonable cost (Pandzic et al, 2016). Power system cost-effectiveness, security, adequacy and reliability analyses have evolved over the years from mere theoretical topics of limited interest, during the era of generous economy and abundant supply and facilities, to a vital branch in today's highlycompetitive business environment of power utility planning and operations (Torre et al, 2008;El-Kady et al, 1985;1986;Chen et al, 2007;Poudel et al, 2018). The investigated reliability indices are not only useful for design of flexible power supply reliability for various customers but also beneficial to long-term system capacity expansion planning of electric power systems (Choi et al, 2006).…”

A Practical Framework for Reliability and Quality Assessment of Power Systems

“…Electric power utilities have a key mandate to maintain a continuous and sufficient power supply to the customers at a reasonable cost. Power system cost-effectiveness, security, adequacy and reliability analyses have evolved over the years from mere theoretical topics of limited interest, during the era of generous economy and abundant supply and facilities, to a vital branch in today's highly-competitive business environment of power utility planning and operations [1][2][3][4]. In response to the growing interest in system security and reliability by power utilities, several schools of thought have evolved with the associated pioneering research aimed at conducting the security and reliability assessment in an efficient, accurate manner and with as much realization of the business nature and practical circumstances of the power utility as possible.…”