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In prior work, the Distributed Gradient Projection (DGP) algorithm was proposed to allow loads or load aggregators to provide contingency service to the grid using local frequency measurements. The DGP algorithm was shown to perform well in linear simulations. The goal of this work is to evaluate the performance of the DGP algorithm in more realistic scenarios and its robustness to issues of practical...
This paper presents an algorithm developed for the optimization of Low Voltage (LV) grids that takes advantage of Distributed Energy Resources (DER) such as storage devices and flexible loads. The proposed approach is based on a multi-temporal Optimal Power Flow (OPF) algorithm that feeds from forecasting tools for load and renewable generation, which means the optimization model looks at a 24-hours...
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...
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.
The challenges associated with controlling power networks are increasing due to integration of renewables, the potential use of storage technologies, and new dynamics introduced via technologies such as electric vehicles and demand side management. Active Network Management (ANM) is a key area to ensure that voltage and thermal limits are not breached. There has been a drive to explore flexible and...
We focus on improving resilience of cloud services (e.g., e-commerce website), when correlated or cascading failures lead to computing capacity shortage. We study how to extend the classical cloud service architecture composed of a load-balancer and replicas with a recently proposed self-adaptive paradigm called brownout. Such services are able to reduce their capacity requirements by degrading user...
Island operation of a fraction of power distribution network with distributed generators (DGs) is considered an efficient operational paradigm to enhance the security of power supply. This paper attempts to address the issue of island partitioning in distribution network with the penetration of small-scale DGs and present a two-stage algorithmic solution. In the suggested solution, the CSP-based method...
A simulation-based approach to optimal design of systems requires collective solution to three related problems: selection of the best equipment, selection of the best system configuration, and optimal operation of the system in a mission-oriented sense. We solve these three problems by applying an improved Particle Swarm Optimization (PSO) algorithm on top of a toolbox that rapidly instantiates system...
Power system operators use dynamic models of the power grid to determine if the transient responses of transmission devices are within tolerable limits. The focus of this work is on the parameter estimation of a complex load model by using measurements from digital fault recorders or phasor measurement units, and the goal is to create a method which will produce more accurate models. Two methods are...
This paper solves stochastic unit commitment problems using multi-cut decomposition algorithm with partial aggregation. The generation unavailability and load uncertainty are both incorporated into the unit commitment formulation, and it is demonstrated by simulations that this method has better performance in economic and reliability perspective than its deterministic counterpart. The modified version...
Area partitioning that splits a power network into self-sufficient islands is an emergency control to stop the propagation of disturbances and avoid cascading failures. This paper provides a survey of the state-of-the-art of power system islanding techniques and proposes the application of a multilevel graph area partitioning algorithm that are applicable to very large power grids. As an emergency...
The concept of integrating small-scale embedded generators into the distribution system has been gaining increasing traction in the research community and with it has come a growing set of contemporary works from the field of artificial intelligence. Thus far however, the studies have failed to explore a diverse set of problems, lack analytical rigour, offer scant comparison between approaches and...
Outage time after extensive blackouts depends very much on the power system restoration process. Power system restoration is a very challenging task to the operator since the situation is so far from normal conditions. This paper proposes a simulation-based tool that determines a feasible sequence of operator actions that restores power system operation. The effect of each candidate switching operation...
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