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This paper presents aspects of the technical evolution in micro-networks efficiency with respect to the power quality and system availability. Different potential approaches for market using are shown. The environmental and economic effects of the micro-networks depends of their implementing phases, like design, commissioning and testing. It can be a lot different than the normal main grid, depending...
To increase the maximum possible benefits of technical, economic and environmental aspects, the optimal sizing and sitting of distributed generation in distribution system has always been challenging for customers as well as to utilities. The objective of optimum sitting of distributed generation in a distribution system is to reach suitable operation of such systems with minimization losses of the...
In recent years is steady upward trend in the share of distributed generation (DG) in electric power systems (EPS) of many countries. Along with the undeniable advantage of this trend is the number of technical problems associated with traditional principles of EPS. These problems include the impact on protective relaying, the impact on the quality of electric energy and stability, impact on the reliability...
The integration of Distributed generation (DG) may bring major changes to the current electrical system. Therefore, the analysis of the power system becomes a need. Among the several issues related to power system, the voltage stability is one of the major interest, once it is a factor that influences the operation system security. In this context, this work aims to analyze the impact that DG may...
With the drive for cleaner energy, Independent Power Producers (IPP's) are tasked in finding suitable potential land sites that meet their renewable project needs and that prove to be technically feasible to integrate into the nearest distribution electrical infrastructure. With the South African utility, Eskom, adapting generic planning guidelines for grid integration of generators, the network planning...
Optimum location and size of distributed generations (DGs) is important to maximize the system's stability. This paper presents a new simple but robust method based on the continuation power flow (CPF) method to determine the optimal location of DG units. The tangent vector in the CPF method provides the ratio of differential change in voltage to differential change in load. Size of DGs at each location...
If distributed generators are introduced on a large scale to the power system, various impacts on the power system are expected. For example, difference between power supply and power demand is occurred in low-voltage distribution system. Digital Grid can solve these problems by performing a power interchange between the power systems. In this paper, we conducted verification and evaluation for Digital...
The existing power grid is experiencing sustaining energy shortage. Distributed generation (DG) including wind energy, solar energy can be a solution for the energy shortage in the existing power grid. Distributed generation is the generation of power using small sized generators that produces electric power at low voltage levels and is connected to the distribution network directly near the load...
The main objective of this paper is to study the influence of dispersed generation upon the steady state of distribution networks, especially upon the voltage level, active power losses and branch currents flow. Power flow calculation of electrical distribution networks with and without distributed generation was realized in MATLAB environment, based on backward-forward sweep. The tests were performed...
This paper presents an optimal allocation method for distributed generations (DGs) for market-based power systems considering congestion relief and voltage stability. The sensitivities of the overloaded lines to bus injections are considered for ranking the load buses. The new generations for these load buses are then computed by genetic algorithm (GA) considering to maximize the system performance...
Distributed Generation is the generation of electricity from many small energy sources and is located closer to the user, or customer. The purpose of using distributed generation is to improve voltage profile, voltage stability and to minimize power losses. This paper presents an overview of research and development work carried out in the field of Distributed Generation. This paper also discusses...
This paper presents a networked control systems (NCS) framework for the coordinated control of distributed generation sources in smart power grids. The system measurements are transmitted to the controller through a realtime communication network. The effects of delays and packet dropouts due to the communication network are modeled and networked controllers are designed to stabilize the system in...
The existing power systems are challenged as the share at MV distribution level of distributed generation is increasing. In order to ensure the security of operation and power quality in these grids, transmission and distribution power system operators have issued connection and operation guidelines related to integration of distributed generation. Some of these guidelines are designed to assess fault...
This paper presents a strategy of online adaptive underfrequency load shedding with wide area measurement (WAM) of nodal market power assessment (NMPA) to minimize the inter-area power requirements by shedding load near to the source of generation-load imbalance in a deregulated power system connected to distributed generation (DG). Simplified frequency response model is used to estimate the frequency...
This paper describes intelligent ways in which distributed generation and local loads can be controlled during large system disturbances, using Local Power Controllers. When distributed generation is available, and a system disturbance is detected early enough, the generation can be dispatched, and its output power can be matched as closely as possible to local microgrid demand levels. Priority-based...
This paper presents an efficient and reliable approach based on swarm intelligence to solve the optimal power flow problem. The optimal setting of distributed generations (DGs) is addressed if one or more generators broken down in a power distribution system, to achieve minimization of fuel cost and voltage profile stability. The proposed approach employs particle swarm optimization (PSO) and group...
Installation of a large number of small sources called distributed generation creates many problems in proper control of national (and European) power grid. At the same time new technologies especially power electronics and measurement data computing associated with smart grid allows to use better and conscious these distributed sources. This paper describes what problems the distributed generation...
Hawaii Electric Light operates an autonomous power system on the island of Hawaii with a diverse mix of generating resources. Although the system is small, with an annual peak in 2009 of less than 200 MW, the power system balancing and frequency control is provided through a conventional centralized Automatic Generation Control system. The mix of generation resources on the Hawaii Electric Light System...
A technique to study the real time wide area power system transient stability assessment using catastrophe theory is presented in this manuscript. This uses the sudden changes of the power system operation (discontinuity) to study the stability margin of the system; unlike conventional approaches which are aimed to figure out numerous thresholds for different operating condition parameters. Further,...
The microgrid concept has the potential to solve major problems arising from large penetration of distributed generation in distribution systems. A microgrid is not a robust system when compared to a power system. Therefore, proper control strategies should be implemented for a successful operation of a microgrid. This paper proposes the use of a coordinated control of reactive sources for the improvement...
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