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This paper presents a distributed optimal power flow approach based on Augmented Lagrangian (AL) and Sequential Quadratic Programming (SQP). It is able to separate the OPF into smaller sub-problems, which could be iteratively solved individually using the SQP. This utilizes the SQP for largescale problems with non-linear objective functions and constraints. Simulation and comparison using the IEEE...
Congestion management is one of the technical challenges in the power system. Privatization and market liberalization lead to stressed operating conditions in existing and future power systems. Additionally, the increasing complexity of the power system results in an increased need for information on the actual grid condition and intelligent control methods. Unfortunately, measurement data from each...
This paper presents a toolbox created with the purpose of offering support for power engineering students to better understand the power system steady-state operation and active power flow control using a phase-shifting transformer (PST). The toolbox consists of a graphical user interface (GUI) that allows the user to define scenarios, run the load-flow calculation and select scenarios in order to...
Congestion management in transmission line is one of the most difficult chores faced by system operator in the rising restructured power system. Congestion in transmission line creates problem for smooth operation in restructured electricity market and increases transmission cost, which leads to profit minimization of the electric power seller and decreases the market efficiency. One of the most effective...
With the recent trend towards deregulating the power systems around the world. This paper presents the computation of congestion cost through interior point optimal power flow algorithm by using incremental and decremental bid method. The primary objective is to use the existing available generation capacity to its maximum extent and operation of the power system in secure state. To evolve a systematic...
This paper describes the works and studies made in one Industrial Plant in TURKEY, to upgrade the existing 45 MW electrical generation capacity to 85 MW through an interconnection between the existing generation systems and national electrical network. Through this extension major modifications have been made in connection lines between Industrial Plant electrical system and national electrical network...
Domestic installations traditionally were believed to be resistive in nature and did not affect power factor much, if at all. With increasing affordability of air-conditioners, and replacement of electrical geysers with heat pumps, loads are becoming more inductive. Small-scale renewable energy generation through e.g. solar photo-voltaic (PV) panels are becoming more affordable and as such are connected...
In order to consider the uncertainty of DG and loads, the interval number is used to describe the uncertainty of the wind speed and loads. The optimal selection and configuration of distributed generators model is established for distribution systems. The largest investment income for independent power producer of DG is taken as the objective function, and interval power flow is introduced to determine...
Traditional power flow algorithm such as the trend for front-and-spoke networks and backward substitution method and a cyclic structure NR method cannot fully reflect the uncertainties affecting the system, and a lot of new energy sources access to change the original properties of the grid, so that a single flow algorithm has significant limitations, the study calculated adapt to the trend of large-scale...
In recent days with the increasing demand of electrical energy the power system is expanding. With the increasing power demand a question arise that whether the existing transmission network is capable to wheel the large amount of power or not. Or what amount of power that can be transferred without any violation of constraints through the transmission network. For this purpose capability of the network...
In this paper, PSO based robust load flow is proposed. In the proposed decoupled based PSO technique, the decoupling features among the power flow variables are taken into consideration. Very simple technique is applied to prompt the convergence. Keeping all inherent properties of evolutionary technique, improvement method is developed to attain better performances. To detect the stability margin,...
In a deregulated power system, the loss in the transmission lines are varied depending on the participation of generator and load. This paper proposes an optimal tracing based loss allocation in the transmission lines. The proportional sharing principle (PSP) is used to trace the power flow in the transmission lines. The Particle Swarm Optimization (PSO) algorithm is used for the optimization of power...
Distributed generation (DG), is being increasingly adapted in distribution network. The advantages of placing DG in the distribution network are loss reduction, backup power supply, and real, reactive power management increase reliability of the network. In this paper Cuckoo Search Algorithm (CSA) has been adapted for optimal sizing and placement of DG for loss minimization Comparisons are made between...
The inherent heterogeneity in the uncertainty of variable generations (e.g., wind, solar, tidal and wave-power) in electric grid coupled with the dynamic nature of distributed architecture of sub-systems, and the need for information synchronization has made the problem of resource allocation and monitoring a tremendous challenge for the next-generation smart grid. Unfortunately, the deployment of...
A new evolutionary optimization technique, crow search algorithm (CSA) is proposed in this paper for solving the optimal power flow (OPF) problem. The algorithm has been implemented on IEEE 30 bus test system to check its effectiveness in solving the OPF problem after satisfying various operational constraints. A comparative study of the results is presented in this paper. Analysis of the results...
This study proposes an effective analyticalheuristic approach for solving optimal placement and sizing of multiple distributed generator problem to achieve a high loss reduction in large-scale distribution network. Proposed analytical- heuristic method (AHM) is based on improvement of LSF (loss sensitivity factor) method. AHM utilizes PSO (particle swarm optimization) algorithm to find the optimal...
This paper presents a mathematical formulation for centralized energy management strategy (EMS) of microgrids in both grid connected and isolated modes. The microgrid energy management is formulated as an unit commitment problem with regard to the distribution network and the corresponding constraints leading to a mixed-integer non-linear programming (MINLP) formulation. In order to reduce the computational...
In this paper, a new approach based on an ac power flow method has been developed for congestion management with the help of Flexible AC Transmission System (FACTS) devices in the power system. In this work, Unified Power Flow Controller (UPFC) has been used for study as it is most versatile device in FACTS family. It has been assumed that UPFC was optimally placed based on some existing method. The...
Optimal power flow (OPF) is one of the key electric power system optimization problems. “Moment” relaxations from the Lasserre hierarchy for polynomial optimization globally solve many OPF problems. Previous work illustrates the ability of higher-order moment relaxations to approach the convex hulls of OPF problems' non-convex feasible spaces. Using a small test case, this paper focuses on the ability...
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...
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