Impact of Data-Driven Modelling Approaches on the Analysis of Active Distribution Networks (original) (raw)
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Effect of distributed generation modelling on performance of distribution systems
International Journal of Power and Energy Conversion, 2013
Due to the continuous increase of distributed generation (DG) penetration into distribution systems, load flow analysis always needs improvement to be more flexible, fast and computationally efficient especially when integrating DG with existing distribution systems. The work in this paper is divided into two parts; in the first part a new algorithm is developed to solve the power flow problem for radial distribution systems with DG modelled as PV bus. This algorithm can be applied for all distribution systems with any number of buses and laterals. In the second part, the developed load flow programme is employed to study the effect of changing the DG location on electric losses and voltage profile. The best location for DG can be determined accordingly to achieve minimum losses with best voltage profile. Typical case studies are implemented and the results obtained are presented and discussed.
2009
Due to the continuous increase of Distributed Generation penetration into Distribution Systems, load flow analysis always needs improvement to be more flexible, fast and computationally efficient especially when integrating Distributed Generation with existing Distribution Systems. The work in this paper is divided into two parts; in the first part a new algorithm is developed to solve the power flow problem for radial Distribution Systems with Distributed Generation modeled as PV bus, this algorithm can be applied for all Distribution Systems with any number of buses and laterals. In the second part the developed load flow program is employed to study the effect of changing the Distributed Generation location on electric losses and voltage profile. The best location for Distributed Generation can be determined accordingly to achieve minimum losses with best voltage profile. Typical case studies are implemented and the results obtained are presented and discussed.
The Effect of Load Modeling on Load Flow Results in Distribution Systems
Effective utilization of power distribution networks requires extensive studies in such areas as using of capacitors, voltage regulators, network reconfiguration, and so on. Indeed, achieving to accurate answers, and managing appropriate solutions for network problems requires a detailed modeling of the network in the process of the above studies. Among the elements that are important for modeling in network research is network loads. Loads are generally being modeled such as constant power. While load nature is often widespread and different. Failure to have a detailed modeling can lead to non-optimal and even wrong answers, and will result in waste of costs and investments. Since the load flow is the basis of any research in distribution networks, in this paper the effect of load modeling on load flow results which can clarify the importance of the load modeling for other network studies are investigated. What can be inferred from this study is that any study in distribution networks can only lead to optimal results if the load model is accurate. Therefore, attempting to measure necessary load parameters and using their exact modeling methods in distribution networks should be done in order to obtain more accurate results and more savings.
This paper aims to describe the main results of a research and development project for allowing the analysis of impacts due to the connection of distributed generation (DG) units to a distribution network and synergies with the expansion planning. The computational implementation has included innovative modules for optimum allocation of DG units, evaluation of system average RMS frequency index (SARFI) for a specific voltage sag magnitude with or without DG units in the network as well as analysis of the impact of a large number of small photovoltaic (PVs) panels. The impact of PV micro-grids is taken into account using the foreseen seasonal and daily variations of sunlight for calculating the generated energy. Since the model allows an integrated representation of low, medium and high voltage networks, the impacts of the DG units can be analysed in any part of the system under study with a single processing. The software has a full graphics interface with integrated maps for helpin...
CIRED 2012 Workshop: Integration of Renewables into the Distribution Grid, 2012
This paper aims to describe the main results of a research and development project for allowing the analysis of impacts due to the connection of distributed generation (DG) units to a distribution network and synergies with the expansion planning. The computational implementation has included innovative modules for optimum allocation of DG units, evaluation of system average RMS frequency index (SARFI) for a specific voltage sag magnitude with or without DG units in the network as well as analysis of the impact of a large number of small photovoltaic (PVs) panels. The impact of PV micro-grids is taken into account using the foreseen seasonal and daily variations of sunlight for calculating the generated energy. Since the model allows an integrated representation of low, medium and high voltage networks, the impacts of the DG units can be analysed in any part of the system under study with a single processing. The software has a full graphics interface with integrated maps for helping the planning activities.
Wind Energy, 2009
coupled with an induction motor as a prime mover. In addition to that, measured values are also compared with the calculated values, obtained by using the turbine models found in the literature. The incorporation of the developed model into some well-known distribution systems' load flow algorithms is detailed. The effect of WTGSs on the power losses, voltage profile of radial distribution systems are evaluated for the sample test systems. Additionally, the performance of the load flow algorithms with the new model are examined and found to be robust and reliable. distribution systems' power fl ow computation different and somewhat diffi cult to analyse as compared with the transmission systems when the conventional power fl ow algorithms are used. 3 As a result, a robust and effi cient power fl ow solution method that must be able to contain the special features of distribution systems is required.
Assessment of load and generation modelling on the quasi-static analysis of distribution networks
Sustainable Energy, Grids and Networks
Quasi-static analysis of power systems can be performed by means of timeseriesbased and probability density function-based models. In this paper, the effect of different load and generation modelling approaches on the quasi-static analysis of distribution networks is investigated. Different simplified load and distributed renewable energy sources generation timeseries-based models are considered as well as probabilistic analysis. Moreover, a more sophisticated approach based on cluster analysis is introduced to identify harmonized sets of representative load and generation patterns. To determine the optimum number of clusters, a three-step methodology is proposed. The examined cases include the quasi-static analysis of distribution networks for different operational conditions to identify the simplified modelling approaches that can efficiently predict the network voltages and losses. Finally, the computational efficiency by using the simplified models is evaluated in temperature-dependent power flow analysis of distribution networks.
Component Modeling and Three-Phase Power-Flow Analysis for Active Distribution Systems
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This thesis presents a novel, fast, and accurate 3ϕ steady-state power-flow analysis (PFA) tool for the real-time operation of the active distribution systems, also known as the active distribution networks (ADN), in the grid-tied and islanded operating modes. Three-phase power-flow models of loads, transformers, and multi-phase power lines and laterals are provided. This thesis also presents novel steady-state, fundamental-frequency, power-flow models of voltage-sourced converter (VSC)-based distributed energy resource (DER) units. The proposed models address a wide array of DER units, i.e., (i) variable-speed wind-driven doubly-fed asynchronous generator-based and (ii) single/three-phase VSC-coupled DER units. In addition, a computationally-efficient technique is proposed and implemented to impose the operating constraints of the VSC and the host DER unit within the context of the developed PFA tool. Novel closed forms for updating the corresponding VSC power and voltage reference...
Brazilian Archives of Biology and Technology
In Brazil, the demand for the acquisition and installation of photovoltaic systems has grown exponentially and, with that, the importance of studies considering their effects on the distribution grids power flow also grows. Due to the intermittent nature of photovoltaic generation, it is important to approach the analysis in a discrete way, taking into account the changes in the power injections during the studied period. Thus, this article presents the daily analysis of the effects of photovoltaic generation on the distribution system through the computational implementation of a discretized power flow routine. The implemented routine can also analyze the effects of other distributed generations on distribution grids, whether those grids are radial or not. The study results show positive impacts on the voltage quality obtained by the photovoltaic systems insertion, for a well-known distribution test system.