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The electric power system is one of the most complex engineered systems. It is, thus, a challenge to design a market that is efficient, transparent, and provides the proper incentives to market participants. Existing market models employ constraint relaxations, which enable various constraints to be relaxed (violated) for a high penalty price. This paper examines the practice of allowing transmission...
The existing transmission lines may be replaced by DC links for constructing the lines more secure, economical and flexible. Thereby, in the present article, a DC link placement problem through the DC link equations with the conventional optimal power flow prospect is studied by using a new optimization technique called chaotic krill herd algorithm (CKHA). Sequential NR based AC/DC load flow method...
In order to achieve economic and security operation of the grid, an economic structure of self-healing control of grid based of multi-agent system is proposed. Considering the distribution grid of micro-source configuration, load priority, healing speed and economic operation, the economic structure make distribution grid achieve maximize achieve economic operation in the case of ensure reliable operation...
Early prediction of cascade events outages followed by immediate and proper control actions can prevent major blackouts. This paper introduces a novel method to predict cascade event outage at early stage and mitigate it with proper control strategy. In the first step, methodology employs sparsely located phasor measurement units to detect disturbances using electromechanical oscillation propagation...
This paper demonstrates the already established fact that by using Distributed Generation (DG), voltage profile of a distribution system can be improved. N-R method is used for load flow analysis. A standard IEEE 14-bus power system is used. To reduce losses three optimization techniques i.e. PSO(Particle Swarm Optimization), GSA(Gravitational Search Algorithm) and hybrid PSOGSA is applied to the...
Constraint management is one of the critical tasks for ensuring secure operation of power supply systems and is generally formulated and solved as an optimal power flow (OPF) problem with generation scheduling and voltage set point controls. In case of severe contingencies, conventional OPF methods may fail to converge, i.e. find solution satisfying all constraints. In such cases, network operators/planners...
With the increasing number of distributed generation connections to distribution networks, the need for better understanding of the distribution network constraints becomes crucial. As distribution networks have not been traditionally designed for two-way power flow, the reverse power flows due to the integration of distributed generation changes voltage profiles and can create significant network...
A systematic procedure for assessing composite system adequacy of power systems incorporating Virtual Power Plants (VPP) is introduced in this paper. The VPP model used in this research work represents an aggregated profile of numerous Distributed Energy Resources together with loads belonging to a specified distribution network. The VPP's performance is evaluated using two new indices — Mean VPP...
The optimal power flow (OPF) problem is important for the economical operation of distribution networks. With the increasing penetration of distributed generation (DG) in the distribution networks, conventional method of centralized optimization have some vital drawbacks which distributed OPF methods are able to overcome. Furthermore, distribution networks are inherently unbalanced and most of the...
The focus of this paper is to examine a controller for a battery energy storage system (BESS), which would reduce the number of deep discharge cycles, with a minimal effect on the regulation services provided by the BESS. Reducing the number of cycles will extend the life expectancy of the BESS, making it a more viable option for the integration of renewable energy onto the power system. To achieve...
The amount of photovoltaic (PV) generation that can be hosted by existing radial distribution feeders is inherently limited by system constraints and operating conditions. This paper discusses an analysis to determine the photovoltaic hosting capacity of an existing radial distribution feeder. This analysis also visualizes the location-dependence of hosting capacity, and tests the effectiveness of...
Studying cybersecurity events and analyzing their impacts encourage planners and operators to develop innovative approaches for preventing attacks in order to avoid outages and other disruptions. This work considers two parts in security studies; detecting an integrity attack and examining its effects on power system generators. The detection was conducted through employing synchrophasor technology...
A multi-step methodology is proposed in this paper to help prevent ice accretion on the power transmission lines exposed to severe ice and snowstorms. The goal is to use the heat gain due to resistive losses in the line to prevent ice from being formed. The proposed algorithm first attempts to re-dispatch the power generation units in such a way that it increases the flow of power through the at-risk...
This paper explores the use of Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) for solving multi objective optimal power flow problems. The algorithms are tested on the IEEE 30 bus system by simultaneously minimizing cost, power losses and voltage deviation under operational constraints. The Pareto optimal and fuzzy methods are employed to identify the best compromise for conflicting...
the abundance of freely available wind energy comes with downside of being stochastic and inconsistent in nature. These properties are not particularly suited for a critically balanced system like electrical transmission grid. This work is primarily focused on assessing the effect of uncertain and stochastic nature of wind power on the stresses it imposes on transmission grid. This impact is studied...
Power being generated in generation system is not meeting demand at load centers, mainly due to losses occurring in distribution networks. The active power losses are reduced either by increasing the size of conductor or by changing transformer taps. However, in present scenario, Distributed Generators (DG) can also play a major role in minimization of losses in distribution network. DGs are different...
This paper presents a distributed optimal control method for stable and economical operation of active distribution network (ADN). The method incorporates a distributed constraint optimization problem (DCOP) model with distributed simulated annealing (DSAN) algorithm based on potential game. Moreover, the distributed optimal strategy is developed on the basis of multi-agent system, and the distributed...
Hybrid Energy Storage Systems (HESS) has the ability of providing fast and accurate response to second-to-second changes of the grids for keeping the power system uninterrupted and stable. This paper presents an enhanced Corrective Security Constrained Optimal Power Flow (CSCOPF) model by combining the technical merits of different Energy Storage technologies. The proposed HESS can be employed to...
In a deregulated electricity supply required method of determining the actual power flow on each line of the generator to load. This paper is a study to solved the problem of the utilization of transmission by using the distribution factor method. The main purpose of this paper is to provide a new scheme for determining the utilization of the transmission line. The proposed method was verified on...
In this paper, a systematic modeling approach is established to represent Type-IV wind turbine generators (WTGs) in multiphase and unbalanced load flow analysis. The proposed modeling technique is developed using modified augmented nodal analysis (MANA) formulation. The constraints on the sequence components of the injected currents from WTGs are integrated to the multiphase load flow equations which...
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