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The aim of this study is to develop an optimal load shedding scheme in order to maintain system stability and minimize amount of loads to shed when the power system network experiences unintentional islanding. In order to handle this optimization issue, a constrain of multi-objective function that consider linear static Voltage Stability Margin (VSM) and amount of load (active and reactive) curtailment...
The never-ending increase in energy demand across the globe requires a new approach towards efficiency in the production, distribution and consumption chain. A system that achieves minimum operational losses becomes more and more attractive. This paper tackles the energy efficiency in distribution networks by proposing an optimum allocation and sizing of capacitor banks. Using a genetic algorithm,...
Voltage quality is an essential requirement in the operation of electricity distribution systems. At consumer busbars, the deviation from the nominal voltage has specific ranges, prescribed in technical regulations. A widely chosen voltage correction approach is to use reactive power compensation. Capacitor banks are used for this purpose in highly loaded networks, but their placement and sizing require...
Amplitude, phase angle, active and reactive powers flowing in each busbar of a power system can be seen by performing a load flow analysis. From these data, it is possible to determine the voltage drop, the distribution of the forces, the loading of the equipment and the losses of the related power system. Then, Active power losses can be reduced by making improvements at the points where losses are...
This paper proposes an efficient methodology to optimally determine the best location and optimum size for Distributed Generators (DG), in a distribution network, while minimizing energy losses and improving voltage profile. The proposed methodology has been designed to consider variable demand and variable DG production scenarios, offering a set of optimum values for DG active power output and power...
Integration of DGs in utility networks has increased significantly over the past years primarily as a result of growing energy demand, coupled with the environmental impacts posed by conventional fossil fuel-based generation. Improper planning of grid integration of intermittent DGs such as wind and solar PV may however pose negative impacts on the quality of power supplied by utility networks. This...
In this paper, a novel method is presented to optimize distributed generation (DG) in distribution networks. The suggested method shows how DGs should change their sizes and places, if it is necessary, to improve the voltage profile and total power loss of distribution networks. For this purpose, game theory is applied to model the optimization problem. At the first step, an appropriate game based...
This paper proposes a solution to deal with the unsymmetrical transient faults in the Medium Voltage DC Shipboard Power System (MVDC SPS), which is employing Static Synchronous Compensator (STATCOM) on the AC load side of the SPS. An improved Genetic Algorithm (FGA) approach is also introduced to design the STATCOM's controller. The performance of the proposed FGA-based controller design compared...
Micro energy grids (MEGs) are small local grids that operate at low voltage or medium voltage levels and include loads, control systems, and distributed generators (DGs). Distribution systems are expected to operate according to interconnected MEGs. A MEG can be scheduled to continue feeding its own loads with minimum power exchange with the main grid. There are demanding procedures for their optimal...
Due to the incremental demands for electrical energy, Distributed Generator (DG) sources are prominent in distribution systems. At the same time, the Locations and Capacities of DG sources have profoundly influenced the system losses in a distribution network. In this paper, a Hybrid algorithmusing Power Loss Index (PLI) & Genetic Algorithm (GA) presented for optimized Location and sizing of DG...
The interest in energy storage is still increasing. Energy storage units are installed in high voltage networks, medium voltage networks and low voltage distribution networks as well. These units are often used to improve power quality. One of the criteria for improving power quality is reducing voltage deviations. Depending on the type of network and specifying its R/X ratio, this criterion can be...
This paper presents results of a heuristic optimization method for parameterization of decentral reactive power control, which can be used to improve static voltage quality in distribution grids. With an optimized Q(V)-curve it is possible to significantly reduce the additional reactive energy and accomplish lower losses in the grid while keeping the voltage within the specified limits. In this paper...
Determining generation units that provide security to the system under normal operating conditions and contingencies is a task of the planner to avoid emergencies. It is more critical when the system is operated with local areas with reduced voltage support and new generation based on renewable energy resources (RER). This work presents a practical method based on the monitoring of the security of...
In the past decades, Distribution System Operators (DSOs) have been mitigating distribution networks (DNs) contingencies by opting to grid reinforcements. However, this approach is not always cost and time efficient. Demand Side Flexibility (DSF) is one of the recent alternatives used in DNs congestion management. Consequently, new market players such as aggregators are needed to handle DSF transaction...
Environmental pollution and greenhouse gas emissions, as well as oil depletion are prime motivators for the development and adoption of renewable power sources. However, the traditional operating philosophy of power systems and the random nature of these sources represent an important barrier for their massive deployment. Fluctuations of wind and solar power generation integrated as distributed sources...
In this paper, the problem of placement and rated power of capacitor banks in the Distribution Network (DN) is considered. We try to suggest the best places for installing capacitor banks and define their reactive power. The considered formulation requires the optimization of the cost of two different objectives. Therefore the use of properly multiobjective heuristic optimization methods is desirable...
In this paper, a novel hybrid population-based algorithm (PSOGSA) is implemented with the combination of Particle Swarm Optimization (PSO) and Gravitational Search Algorithm (GSA) for optimal placement and sizing of capacitor banks in Radial Distribution Systems (RDS). The proposed methodology is provided in two stages. First, the most critical buses for installing capacitors are evaluated using Loss...
This paper aims are improving voltage profile and reducing the losses of active and reactive powers. For simulation purposes, the standard IEEE 14 buses network has been used. Response of the wind turbines in this network should be noted while losing the power network. With regard to the improvement of the voltage profile and reduction of the losses in critical buses, the reactive power resources,...
This paper presents the design of secondary voltage control by tuning the parameters of coordinated PID controllers to eliminate voltage violations in power system contingencies. The coordinated PID control parameters are tuned by using genetic algorithm. The study is presented on modified IEEE 14 bus system. The coordinated secondary voltage control is assigned to the generators and STATCOMs in order...
This paper proposes optimal voltage control strategies for distribution systems that have multiple voltage regulator devices. The system must operate reaching desirable voltage profiles for scenarios that consider extreme loading (heavy and light), unbalanced loads and distributed generation connection. The problem is modeled as an optimization problem that ensures the attendance of the constraints...
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