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Presently, voltage stability indices are ones of powerful tools used to monitor and evaluate power system stability. The purpose of the presented work is to analyse, assess and compare different indices from the point of view of the sensitivity to the network disturbances. The proposed method allows to locate the sensitive area and also to monitor the behavior of indices in order to select the best...
The prime objective of system Operations & Control-SOA (South Operating Area) department is to ensure the safe, secure and economic operation of entire system. This paper presents all aspects of SOA operations to meet demand for CY2016 summer peak. It enumerates the operating conditions/constraints, which need to be applied for that period. It also identifies the system bottlenecks if any and...
This paper presents a graphical method for Controlled Islanding to prevent Blackout occurrence. This proposed method is proven to be effective by the obtained results. The proposed method is very simple in application and it depends on graphical methods. A weight index for the transmission lines which is the ratio between the absolute active power flowing in the line to the reactance of the line (|P|/X)...
Due to the benefits of distributed generation (DG), in particular wind DG on a power system, researches on its optimal allocation increased. However, most of these studies failed to incorporate the stochastic nature of wind which could lead to an erroneous result for not considering uncertainties. To address these uncertainties, different wind DG models are used. This paper compares how optimal allocation...
Bilateral electricity transactions (BET) contribute much to stabilize electricity market operation, while the occurrence of bilateral transactions also presents new challenges to the market operation, transmission pricing, losses allocation, congestion management, etc. Corresponding modeling and analysis methodology to bilateral transactions are in great request. This paper proposes an approach on...
While renewable generation sources provide many economic and environmental benefits for the operation of power systems, their inherent stochastic nature introduces challenges from the perspective of reliability. Existing optimal power flow (OPF) methods must therefore be extended to consider forecast errors to mitigate in an economic manner the uncertainty that renewable generation introduces. This...
With fast technological development in the field of electrical, electronics and software technologies the usage of electrical power is escalating at a faster rate, stressing the generation and transmission system. In order to have continuous supply, Distributed Generators (DG) are positioned at distribution systems meeting growing energy demands. DG increases the economic efficiency in addition to...
This paper presents results from case studies of the future power systems in Morocco and Egypt, with a high increase in renewable generation capacity. Datasets representing 2030 scenarios have been generated and studied with a simplified grid-market model that takes into account variable renewable generation, energy storage and electricity grid constraints. Simulation results for Morocco and Egypt...
The electricity market with open access enables participants to gain more profit out of the bidding strategy. Every supplier tries to maximize its profit as a player in the market. The decision-making process of suppliers and their mutual performance in the market is a complicated problem, can be studied by modeling single-generator and multi-generator companies. The present paper proposes a model...
Optimal power flow (OPF) is known as one of the most important planning and scheduling tools in electrical power systems. The OPF problem is a non-convex, NP-hard optimization problem, therefore, the applications of metaheuristic algorithms in the OPF problem have been gained more attentions in recent years. This article investigates successful application of recently developed optimizer, so called,...
The future of high renewable energy penetration and the consequent power variability produces the need for fast power-flow computations for the useful management of power. Such management must have least requirement for human intervention, achievable through fast and reliable automations. This paper presents Geographic Information System (GIS) integrated automation of a non-iterative power-flow method...
The application of STATCOM or STATCON is common in transmission systems—the device has a capability of P-Q control in four quadrants. DSTATCOM (for distribution systems) and dynamic voltage regulator are somewhat synonymous. This paper describes a unique distribution system with three in-plant generators and an interconnection to a weak utility system at 44 kV; the three-phase short-circuit level...
From the viewpoint of the emerging concept of smart grid, distribution network will require fast power flow solution that must be resolved as efficiently as possible. Presence of distributed generators and power electronic based compensating devices, in modern medium and low voltage distribution networks, additionaly expands requirements for performances of algorithms for power flow calculations which...
The lack of operational flexibility in the transmission grid to react to unexpected system failures caused by the shutdown of conventional power plants requires future active distribution networks to participate in transmission system support, e.g., providing ancillary services. Thus, the need for adequate control strategies to integrate distributions networks in the operation and control systems...
The increasing load demand is pushing power system to operate near its limit, making it more vulnerable to various disturbances and attacks, especially those that might initiate cascading failures. In this study, the joint line-generation attack is introduced which assumes that the lines and generators can be tripped by malicious attacks simultaneously, and it is a natural extension of the previous...
Based on the equivalence method of sensitivity consistency and component particularity representation, an equivalent power flow model and a minimum load shedding model are proposed. With these two models, an equivalent reliability evaluation method considering the equivalence of external system is developed. Because the sensitivity information, voltage support, power support and transfer characteristics...
Uncertainties in frequency regulations (FR) of generators and loads, and their effects on probabilistic power flow (PPF) analysis are addressed in this paper. The conventional PPF analysis is based on power flow model, without considering the frequency regulation. However, according to frequency regulation characteristics, generation outputs and load demand will respond to frequency deviation. Furthermore,...
This paper proposes a novel optimal reactive power dispatch model based on genetic algorithms, utilizing a comparative study on selection methods: roulette-wheel selection and rank selection. Performance of individuals is evaluated based on load flow solutions. A mixed current-power mismatch method is utilized for load flow calculation. The effectiveness of the proposed algorithm for solving the ORPD...
In remote sites (north Canada, islands …); diesel generators are used to produce electricity. This method is relatively inefficient, very expensive and responsible for the emission of large amounts of greenhouse gases. The development and use of a wind-solar-diesel-battery hybrid system will eliminate the main barriers to the deployment of renewable energy in remote locations and decrease production...
This paper presents the principle of a load flow algorithm adjusted to asymmetrical operation of the three-phase distribution networks. The algorithm is based on an iterative procedure, which is independently applied on three equivalent sequence networks and uses a phase-to-phase equivalent model for unbalanced loads connected to the analyzed network.
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