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There is a lot of conversation about microgrids and how they are the future. This seems to be a truth based upon the ever-increasing deployment of DER worldwide. And when the microgrids are described they are typically shown as a self-healing network with a topography that creates a loop of some kind. This might be a great design for new feeder installations, but it would probably mean a lot of additional...
The influence of distributed generation (DG) from renewable energy sources on the distribution network (DN) hosting capacity was analyzed in this paper. The analysis was conducted on the simulation model which represents a real DN with the DG consisting of medium size biogas combined heat & power (CHP) and small size household photovoltaic (PV) systems. Main goal of this paper was to analyze how...
This paper is based on an ongoing project that is evaluating the potential for a microgrid in a city in northwest region of the US. Power for the microgrid will be supplied largely from existing hydroelectric generators and proposed photovoltaic installations. This study focuses on the voltage profiles of all of the buses in the microgrid during different seasons of the year and identifies the ways...
Utility-scale generating plants are traditionally interconnected to the power transmission grid. However, with the adoption of incentives to promote the development of clean energy resources, the interconnection of utility-scale distributed generation (DG) is becoming more prevalent at the distribution system. These circumstances have challenged the utility's process to respond with the increasing...
The transition towards large-scale renewable electricity generation represents a potential challenge to the dynamic stability of the European power system. Problems such as reduced rotational inertia and inter-area oscillatory instability must be mitigated through new approaches to system planning and operation. However, the datasets required for accurate modeling of the European transmission system...
To enable greater innovation in power systems, our research seeks to create entirely fictitious synthetic power system networks that capture the functionality, topology, and defining characteristics of the actual U.S. transmission system, and thus provide realistic test cases for research, without revealing any sensitive information. Creation of these models relies only on publicly available data...
In this paper, we critically analyze the optimization strategy of distribution network based on adapting adjustment of transformer's taps and review a large amount of relevant literature in order to explore the state-of-the-art research progresses in both academia and industry. By the analysis and literature review, a complete research proposal pertaining to the optimization strategy of distribution...
This paper presents the analysis of a distribution system subject to reconfiguration with high wind penetration over a period of 24 hours. In order to meet this objective, the reconfiguration problem is solved through mixed integer linear programming considering the stochasticity of the variables, where the balance between load and generation has to be satisfied at the lowest cost in each period....
A generator of random numbers can be used in a calculation wherever a constant is used in a mathematical equation, for which changes of numerical values within a specific range can be determined on the base of an empirical research. This way a random change of a numerical value of one or more values influencing parameters of an electrical circuit can be expressed mathematically at the same time. A...
The number of applications for Distributed Generation (DG) interconnections received by utility system operators is increasing every year. As the various DG technologies mature and the cost per kilowatt of generation goes down, utilities may receive more applications for generation interconnections large enough to require detailed system impact analysis before approval. Many utilities are already...
In this paper we analyse the interconnection of a seawave power farm to the grid. The generator type used in the farm is a linear synchronous generator driven from the seawaves that generates, highly distorted emfs. We presents two possible ways to interconnect the farm to the grid. One is based on an approach where for each generator there is a conversion subsystem that permits the direct connection...
This paper addresses the multistage expansion planning problem of a distribution system where investments in the distribution network and in distributed generation are jointly considered. Network expansion comprises several alternatives for feeders and transformers. Analogously, the installation of distributed generation takes into account several alternatives for conventional and wind generators...
The power loss reduction is one of the main targets for any electrical energy distribution company. In this paper the problem of the joint optimization of both topology and network parameters in a real Smart Grid is faced. A portion of the Italian electric distribution network managed by the ACEA Distribuzione S.p.A. located in Rome is considered. It includes about 1200 user loads, 70 km of MV lines,...
The paper presents dynamic assessment of voltage and reactive power control in the Main Interconnected Transmission System (MITS) in Oman. Two case studies are considered; namely the MITS with and without temporary diesel generators. Voltage and reactive power control is achieved by optimization process to maximize reactive power margin of generating units to maintain as much as possible reserves...
The introduction of Distributed Wind Generation (DWG) into distribution networks has a significant effect on the losses and voltage distribution of the network. This effect can be detrimental or beneficial depending on where DWG units are allocated and which sizes they have. This paper deals with optimal siting and sizing of DWG units for minimizing the total power losses and improving the voltage...
Distribution level modeling or monitoring has not been of primary concerns of the utility companies so far, because traditionally the electric power is delivered unidirectional from distribution substations to the customers. Meanwhile, integrating Distributed Energy Resources (DER) into the distribution feeders and contribution of the customers in demand response and other aspects of the future smart...
Distributed resources (i.e., distributed generation and energy storage) and some special loads (e.g., electrical vehicle) raise new challenges for load flow calculations in distribution systems. Intermittent and non-dispatchable generation units, complex time-dependent or asymmetrical loads require capabilities that until very recently were not available in many distribution software packages; for...
It is common knowledge that large scale integration of Dispersed Generation (DG) in distribution networks may cause voltage quality problems. But, on the other hand, if correctly controlled it may be able to provide a means of solving these problems.
Traditional grid models for large-scale simulations assume linear and quasi-static behavior allowing very simple models of the systems. In this paper, a scalable electric circuit simulation capability is presented that can capture a significantly higher degree of fidelity including transient dynamic behavior of the grid as well as allowing scaling to a regional and national level grid. A test case...
We discuss the evolving role of communication and control for automatic load management in electric distribution systems. We start by reprising a description of the Athens project - one of the earliest deployed examples of automatic load management at consumers enabled by communication signals. We observe that the use of communication for such systems has gone through distinct phases in its evolution...
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