Research about impact of DGs in distribution networks

Yu, Juebang; Sun, Mingxuan; Deng, Bo

doi:10.1109/ciced.2008.5211807

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…The traditional utility networks, being radial and passive are highly exposed to external disturbances but maintain their safety and security using conventional protection devices, as shown in Figure 1. Such protection devices lose their selectivity, to operate at the time of event for systems having intermittent power sources e.g., Distributed Generations (DGs) due to the bi-directional power flows [3,4]. In order to upgrade the existing protection schemes, two strategies are available, (1) changing internal settings of relays online and (2) adding directional element.…”

Section: Introductionmentioning

confidence: 99%

Novel Protection Coordination Scheme for Active Distribution Networks

et al. 2021

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Distribution networks are inherently radial and passive owing to the ease of operation and unidirectional power flow. Proper installation of Distributed Generators, on the one hand, makes the utility network active and mitigates certain power quality issues e.g., voltage dips, frequency deviations, losses, etc., but on the other hand, it disturbs the optimal coordination among existing protection devices e.g., over-current relays. In order to maintain the desired selectivity level, such that the primary and backup relays are synchronized against different contingencies, it necessitates design of intelligent and promising protection schemes to distinguish between the upstream and downstream power flows. This research proposes exploiting phase angle jump, an overlooked voltage sag parameter, to add directional element to digital over-current relays with inverse time characteristics. The decision on the direction of current is made on the basis of polarity of phase angle jump together with the impedance angle of the system. The proposed scheme at first is evaluated on a test system in a simulated environment under symmetrical and unsymmetrical faults and, secondly, as a proof of the concept, it is verified in real-time on a laboratory setup using a Power Hardware-in-loop (PHIL) system. Moreover, a comparative analysis is made with other state-of-the-art techniques to evaluate the performance and robustness of the proposed approach.

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Section: Introductionmentioning

confidence: 99%

Novel Protection Coordination Scheme for Active Distribution Networks

et al. 2021

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“…Moreover, the DG does not contribute to the greenhouse gases providing clean and efficient energy. The negative effects of DG application are: fault current level increase, discoordination of protection schemes, islanding, bidirectional power flows, and transient instabilities [3].…”

Section: Introductionmentioning

confidence: 99%

Protection Coordination of Properly Sized and Placed Distributed Generations–Methods, Applications and Future Scope

2018

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The radial distribution networks are designed for unidirectional power flows and are passive in nature. However, with the penetration of Distributed Generation (DG), the power flow becomes bidirectional and the network becomes active. The integration of DGs into distribution network creates many issues with: system stability, protection coordination, power quality, islanding, proper placement and sizing etc. Among these issues, the two most significant are optimal sizing and placement of DGs and their protection coordination in utility network. The proper coordination of relays with high penetration of DGs placed at optimal location increases the availability and reliability of the network during abnormal operating conditions. This research addresses most of the available methods for efficient sizing and placement of DGs in distribution system (numerical, analytical and heuristic) as well as the developed protection coordination techniques for utility networks in the presence of DGs (Artificial Intelligence (AI), adaptive and non-adaptive, multi-agent, hybrid). This paper indicates the possible research gaps and highlights the applications possibilities and methods’ limitations in the area of DGs.

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“…Research by Gupta et al [17] presents a performance on optimal reliability strategy of electrical DSs. DG connection in DS, the constancy and safeguard the distribution network performed a detailed exposition in [18].…”

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confidence: 99%

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Pattabhi¹,

Sundar

Lakshmikantha

2023

Bulletin EEI

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Distribution systems (DSs) are highly stressed with addition of newer loads like electric vehicle charging stations and lower scope for expansion due to urbanization. Any line outage could cause interruption to major loads. Reliability studies have gained importance for lowering the frequency and lowering the duration of interruption for supply systems. In this paper a bistage method for optimum placement of reactive power compensation devices and distributed generations (DGs) for enhancing voltage stability and system reliability. A new method named delta analysis method is used to optimally locate the reactive power compensation devices and DGs. IEEE-33 radial DS, which is taken as experimental system. Based on the study, the fixing of reactive power compensation devices and DGs are to increase voltage outline of buses and decrease power fatalities. After the placement of DGs, the enhancement in reliability indices following line contingency is studied using MATLAB simulation.

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Research about impact of DGs in distribution networks

Cited by 6 publications

References 3 publications

Novel Protection Coordination Scheme for Active Distribution Networks

Novel Protection Coordination Scheme for Active Distribution Networks

Protection Coordination of Properly Sized and Placed Distributed Generations–Methods, Applications and Future Scope

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