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Services provided by distributed generation (DG) to power generation and transmission systems have become an urgent necessity due to increase in load demand in recent years. These services include bridging the lack of central generation, increase the reliability of the network, reduce the inactive power in the system, and improve the margin of voltage for the network. On the other hand, the use of...
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...
Micro-grid technology is well-suited to power supply of an island. As to micro-grid planning, a critical issue is how to optimize sizes of distributed generation so that reliability and efficiency of power supply can be assured. This paper calculates different costs of equipment, operation, maintenance and replacement for different distributed resource models. Annual meteorological conditions, load...
Installation and control of proposed and/or connected distributed generation is constrained technically by the relevant protection systems, network structure and by documentation that governs its operation. This documentation which refers openly to the regulatory framework, standards and specification both by a utility, municipality or government regulatory body guides the manner in which a distributed...
The paper examines application of wavelet transform for voltage dips detection in microgrids with distributed generation. IEEE13 test grid with added 1.6 MW distribution generators is used for evaluation. Distribution generators are two 0.8 MW doubly-fed induction generators. Matlab/Simulink environment is used for modelling and evaluation of proposed algorithm for voltage dips detection. Six types...
The increasing share of renewables is creating new challenges for distribution grids and operators have to adopt more and more advanced tools for the evaluation of network investments, especially for scenarios in which distributed generation is expected to drastically grow. In particular, the maximum connectable power (Hosting Capacity) as well as the benefits that Smart Grid technology can bring...
This paper analyzes the impacts of using distribution-level locational marginal prices (DLMPs) as a basis for valuing generation connected to low-voltage distribution feeder systems. The consistency between economic signals embedded in DLMPs and the impacts of distributed generation (DG) on the operation of low voltage grids is analyzed. We investigate how the revenues captured by DG agents connecting...
The electrification of heat and transport along with significant increases in distributed energy resources pose challenges for distribution network operators (DNOs) as they evolve into distribution system operators (DSOs). Issues may include capacity constraints, voltage excursions, lower supply security and reduced power quality. A method of addressing these matters whilst unlocking capacity is therefore...
Nowadays, the expansion of renewable energies (the wind, solar, ocean wave, fuelcell-some of them are natively DC) in power system as a potential solution for the environmental protection and lack of energy when the traditional energies are going to be exhausted. Besides, the development of fullness DC as storage technologies (batteries and ultra-capacitors), and DC loads (Data centers, electronic...
The paper addresses the possibilities of application of discrete Short-time Fourier transform (STFT) and Fast Fourier transform (FFT) for detection of voltage dips in the distribution grid with high level of distributed generation in the concept of the future smart grids. Modelling and testing are carried out in the MATLAB/SimPowerSystems environment. Modified IEEE13 bus system with high level of...
Novel approaches for the decentralized operation of the power system are gaining attention. In this direction, a fully distributed method is proposed for the economic dispatch problem that takes into account transmission losses. We assume that the total losses are calculated using loss coefficients and that the generators communicate through a peer-to-peer structure calculating the solution in a distributed...
The paper presents a model based analysis of different network charging schemes with respect to their ability to provide good incentives for prosumers with or without storage as well as to achieve a fair distribution of network cost between different network levels with varying shares of distributed generation. It finds charging schemes based on net energy or net peak to reflect the effects of generation...
Energy storage systems (ESS) have been proposed for voltage regulation to ameliorate power quality issues caused by solar photovoltaics (PV) on distribution networks. In this paper ESS are compared with conductor reinforcement, in-line voltage regulators and reactive power support for this purpose. They are compared on a case study from the South West of the UK with existing voltage rise problems...
The electric power industry is currently in transition to a new technological platform, which is based on the smart grid concept. Important components of this grid include distributed generation plants as well as those based on renewable energy sources. The centralized system of control of numerous distributed generation plants becomes inefficient due to the need for transferring large amounts of...
This article presents an application of the Particle Swarm Optimization (PSO) on the optimization of the power flow in a IEEE system with 30 nodes, which has some nodes with distributed generation. In first place, the mathematical model used for the optimization of the electricity generation costs. Afterwards, this model is applied in a case study with a IEEE system with 30 nodes. The results obtained...
This paper discusses the introduction to Smart Energy Source's (SES) Progressive Resource Energy Park (PREP) and PREP design processes. The PREP application to Central Rural Electric Cooperative's Innovation Pointe campus microgrid. The microgrid consists of solar distributed energy resource (DER), battery energy storage and emergency diesel generation. This microgrid is controlled by a medium voltage...
An increase in the decentralization of power generation, it has become necessary to study the effects of distributed generation and propose a suitable modification to the protection system to increase the reliability. The paper focuses on the effect of distributed generation on the quality of power at any location concerned due to faults occurring on the power system. The waveforms of the currents...
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...
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...
This paper analyzes the interaction among the costumers and generators in the energy free market and presents a tactic to optimize the interactions benefiting both of them. It is proposed a methodology to choose the contracts that minimizes the risk of energy feeding scheduling non dispatchable sources and a new fuzzy algorithm to predict the costumers demand. The strategy is based on the seasonal...
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