Influence of supply voltage and frequency variations on the electrical equipment and power consumption in LV and MV distribution networks

Achieving the energy transition target will require the extensive engagement of consumers and the private sector in investment and operation of renewable-based power systems. Support of individual prosumers and proliferation of energy communities are efficient ways to implement this engagement. To facilitate smooth integration of prosumers with photovoltaic (PV) installations, while satisfying effective operation of the power distribution system (PDS), it is important to fundamentally assess energy losses for different grid development scenarios. In this paper, the energy losses are compared for two alternatives: (a) when prosumers with PV installations act as individual grid users, and (b) when prosumers become participants of a solar energy community. To achieve this goal, modeling of loads, prosumers' behavior and PV generation was performed. Furthermore, it has been analyzed how the physical topology of the distribution network can be harmonized with the underlying bidirectional power flows for each alternative, while complying with system constraints. The IEEE 123 Node Test Feeder was employed to capture the performance of the PDS and to estimate the energy loss with various penetration levels of prosumers. The results indicate that reduction of energy losses is only possible until a certain PV penetration level, after which additional PV capacities cause increase in energy losses and complicate the PDS's operation. Lower energy losses were supervised for the cases with dispersed PV generation, compared to the cases focused on energy communities. This means that the PDS demonstrates better tolerance to evenly distributed prosumers, rather than to single sources of a larger scale installed in one node. The outputs of this study will help the energy planners and utilities in improving performance of the PDS in terms of loss minimization and loadability maximization. JEL CLASSIFICATIONRenewable power engineering 1

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“…It is accepted in this work that voltage deviations should not exceed ±0.1 p.u. violation threshold [32].…”

Section: Problem Statement Methodology and Modelling Used For The Studymentioning

confidence: 99%

Assessment of energy losses in power distribution systems with individual prosumers and energy communities

Diahovchenko

Petrichenko

2023

The Journal of Engineering

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“…For these cases, the reverse power flows caused by the high PV penetration was significant, which led to the voltage deviations beyond the ±0.1 p.u. threshold [47] during pick-generation hours. Furthermore, some branches were overloaded 1.1 ÷ 1.3 times during pick generation hours.…”

Section: Assessment Of Energy Losses At Different Capacities Of Pv Unitsmentioning

confidence: 99%

“…It is accepted in this work that voltage deviations should not exceed ±0.1 p.u. violation threshold [47].…”

mentioning

confidence: 99%

Comparative Analysis of Power Distribution Systems with Individual Prosumers Owing Photovoltaic Installations and Solar Energy Communities in Terms of Profitability and Hosting Capacity

Diahovchenko

Petrichenko

2022

Energies

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Future energy markets are foreseen to integrate multiple entities located mainly at the distribution level of the grid so that consumers can participate in energy trading while acting as individual prosumers or by forming energy communities. To ensure the smooth integration of prosumers and satisfy the effective operation of the power distribution systems (PDSs), it is important to fundamentally assess their performance for different grid development scenarios. This paper aims to estimate and compare the hosting capacity (HC) thresholds and profitability for two alternatives: (a) when the PDS experiences rapid growth of scattered individual prosumers with photovoltaic (PV) installations and (b) when prosumers intend to formulate a medium-scale energy community, which is a single source located in one node. Maximization of the profits of decision-makers and maximization of the capacity of the PV generation were set as the two objectives for the optimization tasks. It has been analyzed how the physical topology of the distribution network can be harmonized with the underlying bidirectional power flows for each alternative while satisfying system constraints. A typical distribution test feeder is employed to estimate the energy loss and voltage variations in the PDS, as well as the profitability for energy producers, for various penetration levels of prosumers, in comparison to the base case with no PV generation. The results indicate that improvements in terms of profitability and reduction of energy losses can be achieved in both alternatives, as long as the penetration of PV systems does not reach a certain threshold, which can be chosen by decision-makers and is limited by the HC. Comparing the results of the simulation, EComs demonstrate higher HC vs. individual prosumers, both in terms of technical and economic priorities.

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“…During normal operation, it is not a complicated task for electricity suppliers to meet the requirements of MSZ EN 50160. The characteristics of the power supply should be kept within the prescribed range only for 95 % of the period under consideration (see Table I), and the permissible deviations may be significantly greater during the remaining 5 % of the period [3]. For example, the mean value must be between 90 % and 110 % of the nominal voltage only for 95 % of the time.…”

Section: Introductionmentioning

confidence: 99%

Introduction of state-of-the-art low-voltage distribution network devices

Holcsik,

Morva,

Bencsik

et al. 2022

EREE

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Trends towards the development of distributed generation involve a number of problems related to maintaining the quality of electric energy in medium and, especially, low-voltage networks. The article examines the impact of monitoring the quality of electricity of low voltage classes on the reliability of the electrical network. MSZ EN 50160 and Hungarian Energy and Utilities Regulatory Office (MEKH) standards are considered. In accordance with MSZ EN 50160, the main indicators of the quality of electric energy are considered, such as: frequency, voltage fluctuations, rapid voltage changes, Flicker dose, voltage dips, short-term voltage interruptions, long voltage interruptions, temporary overvoltages of industrial frequency, transient overvoltages between current-carrying conductors and voltage ground , harmonic voltage fluctuations, interharmonic voltage fluctuations. SAIFI and SAIDI are calculated according to the Hungarian Energy and Utilities Regulatory Office. The devices for monitoring the quality of electricity of low-voltage networks are analyzed. The factors affecting the choice of the place of installation of monitoring devices are considered. It is presented how power quality monitoring systems can reduce the number of malfunctions in the 0.4 kV network, and the influence of monitoring systems on the quality of electric power in 6-35 kV networks is considered.

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Influence of supply voltage and frequency variations on the electrical equipment and power consumption in LV and MV distribution networks

Cited by 3 publications

References 11 publications

Assessment of energy losses in power distribution systems with individual prosumers and energy communities

Assessment of energy losses in power distribution systems with individual prosumers and energy communities

Comparative Analysis of Power Distribution Systems with Individual Prosumers Owing Photovoltaic Installations and Solar Energy Communities in Terms of Profitability and Hosting Capacity

Introduction of state-of-the-art low-voltage distribution network devices

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