Impacts of microgrids with renewables on secondary distribution networks

Zehir, Mustafa Alparslan; Batman, A.; Sonmez, Mehmet Ali; Font, Aytug; Tsiamitros, Dimitrios; Stimoniaris, D.; Kollatou, T.; Bağrıyanık, Mustafa; Özdemir, Aydoğan; Dialynas, E.N.

doi:10.1016/j.apenergy.2016.12.138

Cited by 38 publications

(15 citation statements)

References 34 publications

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“…In fact, the bidirectional traffic on the lines is a problem for DNOs "particularly in radial LV networks, where renewable intermittency and bidirectional power flow may cause critical problems such as under/over voltages, line overloads and high energy losses. System operators consider the worst-case scenarios for the assessment of the impacts of new integrations and usually they prefer passive methods to mitigate the negative effects" [10]. Traditional distribution network practice is often described as 'fit and forget' [38], but as the volume of connected DG increases, the amount of available network capacity becomes exhausted and, if more DG is to be accommodated, some improvements become necessary [39].…”

Section: Residential Microgrids Versus Dnosmentioning

confidence: 99%

“…In addition to the favourable economic perspectives and to the political encouragement, the take-up of MGs that include storage can be further facilitated by the District Network Operator (DNO). The bidirectional power flow and the intermittency of RES cause congestion on LV networks, as well as under/over voltages, overloads and line losses [10]. By facilitating the development of Decentralized Energy Resources (DER) solutions and encouraging energy storage, DNOs can avoid these problems for themselves.…”

Section: Introductionmentioning

confidence: 99%

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Economic Performance of Using Batteries in European Residential Microgrids under the Net-Metering Scheme

et al. 2019

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Decentralized energy production offers an increased share of renewable energy and autonomy compared to the conventional, grid-only solution. However, under the net-metering scheme, the energy losses in batteries translate into financial losses to an investor seeking to move away from grid-only electricity and set up a residential PV+Battery microgrid. Our paper examines a hypothetical support scheme for such a project, designed to balance the economic disadvantage through partially supporting the acquisition of batteries, and thus ensure that the microgrid solution is more attractive than no investment. For this we develop four case studies based on experiments carried out in Greece, Italy, Denmark and Finland. Using the minimization of the Net Present Cost for each project, we compare the PV+Battery solution to the grid-only scenario over 25 years, for a range of electricity prices. The results illustrate first how the success of this project depends on the price of electricity. Second, we find that under current conditions in the respective countries the need for battery support varies between zero in Denmark and 86% in Italy, which reflects how the disadvantages of net metering can only be counterbalanced by either very high electricity price or very high solar resource. Our paper contributes thus to the discussion about the favourable environment for batteries in residential microgrids.

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Section: Residential Microgrids Versus Dnosmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Economic Performance of Using Batteries in European Residential Microgrids under the Net-Metering Scheme

et al. 2019

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“…MG is localized and small-scale power system and the length of line cable is short. Therefore, the resistance of the MG cable between two buses m and n (R mn ) is very small and the power line losses is neglectable in the MG system [21,31]. Therefor, power losses of lines are not considered in this study.…”

Section: Mathematical Modelsmentioning

confidence: 99%

“…where I mn is the current magnitude flowing through the line between two buses m and n in the MG system [31]. MG is localized and small-scale power system and the length of line cable is short.…”

Section: Mathematical Modelsmentioning

confidence: 99%

Optimal Operation of Microgrids Considering Auto-Configuration Function Using Multiagent System

2017

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Monitoring the status of existing devices and identification of newly added devices is required in microgrids to adjust the operation schedule followed by any event or integration of a new device. Therefore, in this paper, automatic reconfiguration of microgrids is considered after the addition of a new device or change in the operation status of an existing device by using a multiagent system. This capability of the microgrid is named as auto-configuration function, which is performed by the auto-configurator agent. In case of addition of a new device, the auto-configurator agent is responsible for authorization and registration of the newly added device. In case of change in status of any existing device, the status information is updated. After integration of a new device or change in status of an existing device, re-optimization is carried out by the energy management system (EMS) agent. Agent communication language (ACL) is used to develop a modified contract net protocol (MCNP) for communication among different agents. EMS agent and auto-configurator agent exchange information for economic rescheduling of the microgrid components. Simulation results have shown that the proposed method can be used for optimal operation of microgrids when the configuration changes due to the addition/removal of a device.

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“…Electro-technical aspects of an unexpected microgrid islanded operation were also analyzed in [14] while considering optimal energy management of the microgrid and anticipating an outage at any hour. The impacts of microgrids with renewable generation, particularly on radial lines in distribution networks, have been studied, for example, in [15]. A grid-connected microgrid economic operating strategy was proposed in [16] to minimize the operating cost for the operating period of 24 h ahead.Characteristics of, for example, the Finnish rural medium voltage (MV) networks, are long distances and low loads, and thus, underground cabling of the overhead line connections to increase reliability is not an economical option as it is for the distribution network development.…”

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confidence: 99%

Microgrid as a Cost-Effective Alternative to Rural Network Underground Cabling for Adequate Reliability

2018

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Microgrids can be used for securing the supply of power during network outages. Underground cabling of distribution networks is another effective but conventional and expensive alternative to enhance the reliability of the power supply. This paper first presents an analysis method for the determination of microgrid power supply adequacy during islanded operation and, second, presents a comparison method for the overall cost calculation of microgrids versus underground cabling. The microgrid power adequacy during a rather long network outage is required in order to indicate high level of reliability of the supply. The overall cost calculation considers the economic benefits and costs incurred, combined for both the distribution network company and the consumer. Whereas the microgrid setup determines the islanded-operation power adequacy and thus the reliability of the supply, the economic feasibility results from the normal operations and services. The methods are illustrated by two typical, and even critical, case studies in rural distribution networks: an electric-heated detached house and a dairy farm. These case studies show that even in the case of a single consumer, a microgrid option could be more economical than network renovation by underground cabling of a branch in order to increase the reliability.The profitability possibilities of residential microgrids as an aggregator-based solution to the perspective of different stakeholders, for example, utilities, aggregators, and prosumers, were analyzed in [6]. The feasibility and profitability of microgrids participating in the primary frequency control reserve (FCR) market through an aggregator were assessed in [7]. Furthermore, battery energy storage system (BESS) usage on the frequency regulation market was analyzed in [8].According to [9], underground cabling of the network is an effective way for distribution system operators (DSOs) to increase the reliability of power supply. However, underground cabling is expensive.Today, farming is highly automated and electricity-dependent [10], and even short power interruptions are very detrimental. Farming is an energy-intensive industry [11], and thus farmers value the reliability of the electricity supply more so than most of the other customer groups.Farms are located naturally in rural areas, possibly on the long distribution network radial branches with low electricity customer density. The majority of farmers have backup generators (e.g., [11]). Farmers having their own power production to cover a portion of their electricity need is gaining popularity.Several recent studies have focused on microgrid islanded-mode operation, microgrid energy management systems, and power supply adequacy and forecasting (e.g., [12][13][14]). The power supply capability in islanded-mode operation was assessed in [12] over a few hours by using a simulation maximum time step of 1 min. Electro-technical aspects of an unexpected microgrid islanded operation were also analyzed in [14] while considering optimal energy management of...

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Impacts of microgrids with renewables on secondary distribution networks

Cited by 38 publications

References 34 publications

Economic Performance of Using Batteries in European Residential Microgrids under the Net-Metering Scheme

Economic Performance of Using Batteries in European Residential Microgrids under the Net-Metering Scheme

Optimal Operation of Microgrids Considering Auto-Configuration Function Using Multiagent System

Microgrid as a Cost-Effective Alternative to Rural Network Underground Cabling for Adequate Reliability

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