Overvoltage Considerations for Interconnecting Dispersed Generators with Wye-Grounded Distribution Feeders

Lee, Myeong Soo; Chase,; Dugan,

doi:10.1109/mper.1984.5526231

Cited by 4 publications

(5 citation statements)

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“…It is well known that an ungrounded synchronous generator connected to a four-wire circuit will produce GFOV on that circuit during 1LG faults [1]. The mechanism by which this happens is illustrated in Figure 1, which shows an ungrounded synchronous generator serving a four-wire multigrounded neutral circuit and a grounded-Y impedance load.…”

Section: A Case Of Yg-connected Load and Synchronous Generatormentioning

confidence: 99%

“…When this situation occurs, loads that are connected between an unfaulted phase and the neutral can be exposed to a 173% (√3) transient overvoltage (TOV). It has been known for some time that ungrounded rotating generators can produce GFOV if they energize a four-wire circuit with a 1LG fault after that circuit has been disconnected from the main utility source [1]. The GFOV problem for rotating generators is normally solved via effective grounding [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

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Ground Fault Overvoltage With Inverter-Interfaced Distributed Energy Resources

Ropp

Hoke

Chakraborty

et al. 2017

IEEE Trans. Power Delivery

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Ground Fault Overvoltage can occur in situations in which a four-wire distribution circuit is energized by an ungrounded voltage source during a single phase to ground fault. The phenomenon is well-documented with ungrounded synchronous machines, but there is considerable discussion about whether inverters cause this phenomenon, and consequently whether inverters require effective grounding. This paper examines the overvoltages that can be supported by inverters during single phase to ground faults via theory, simulation and experiment. It identifies the relevant physical mechanisms, quantifies expected levels of overvoltage, and makes recommendations for optimal mitigation. It concludes that under many circumstances, effective grounding of inverters is not necessary to prevent ground fault overvoltage.

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Section: A Case Of Yg-connected Load and Synchronous Generatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ground Fault Overvoltage With Inverter-Interfaced Distributed Energy Resources

Ropp

Hoke

Chakraborty

et al. 2017

IEEE Trans. Power Delivery

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“…This can occur when supply exceeds consumption. This can lead to physical damage [11,12]. As another key point, and although load control is not strictly a decentralized energy issue, the use of more intelligent load control schemes is highly complementary to decentralized energy supply.…”

Section: Introductionmentioning

confidence: 99%

Methodology for the design of energy production and storage systems in buildings: Minimization of the energy impact on the electricity grid

Salvador

Grieu

2012

Energy and Buildings

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human life requires energy. Moreover, people spend around 90% of their time in buildings while about 40% of primary energy needs are due to buildings. That is why the present paper deals with a methodology allowing identifying and assessing the energy impact of a building on the electricity grid. Thanks to both the building models we developed and fuzzy logic contribution (used to control ventilation and develop occupancy scenarios related to human habits and lifestyle), the results we obtained in simulation validate the proposed impact indicator. Different insulation levels were considered as well as energy production (solar photovoltaic and thermal panels and a vertical axis windmill) and storage (a domestic hot water tank) systems. These results highlighted the pertinence of such an indicator for optimizing the design of the just-mentioned systems and minimizing the amount of energy exchanged by buildings and the electricity grid. One can promote energy injection or take into account the status of the electricity grid when designing these systems. As a key result, the produced renewable energy is partially self-consumed, what allows for a more efficient and rational use of energy in buildings.

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“…These may reflect adversely to critical operational factors in the electric grid such as frequency, voltage [5][6][7][8][9][10][11][12][13][14][15][16], and reactive power control [17]. Power production close to the end user may affect the power systems' quality, reliability, efficiency, and operational reliability in different ways.…”

Section: Introductionmentioning

confidence: 99%

“…With local production close to the end-use, power flows may be reverse compared with traditional systems, demand and supply may become unbalanced, so on. These may reflect adversely to critical operational factors in the electric grid such as frequency, voltage [5][6][7][8][9][10][11][12][13][14][15][16], and reactive power control [17]. On a system level, the operational basis of the whole electricity production system may need to be revised and controlled in a more innovative way than with traditional production units [18].…”

Section: Introductionmentioning

confidence: 99%

Alternative ways for voltage control in smart grids with distributed electricity generation

Niemi

Lund

2011

Int. J. Energy Res.

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SUMMARY In this paper, we have studied different strategies for managing voltage fluctuations in distribution networks originating from decentralized electricity generation systems (DEGS) or increased loads, which are highly important issues in the smart grid context. A starting point for system design when increasing load or local power production could be to limit the voltage fluctuations to ±5% from nominal voltage. Strategies to regulate voltage include cable improvement, transformer management, Demand side management, storage, and line interconnection. We present a mathematical model applicable for both a static and dynamic analysis to quantify effects from these measures, though the best solution will depend on local conditions and needs to be determined case by case. Combining several voltage control options simultaneously may lead to further positive effects. Strategies when doubling the load and increasing DEGS production to twice the electricity demand were analyzed here in detail. It also needs to be pointed out that other factors related to power quality besides voltage may need consideration when large amounts of DEGS are integrated to distribution networks. Copyright © 2011 John Wiley & Sons, Ltd.

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Overvoltage Considerations for Interconnecting Dispersed Generators with Wye-Grounded Distribution Feeders

Cited by 4 publications

References 0 publications

Ground Fault Overvoltage With Inverter-Interfaced Distributed Energy Resources

Ground Fault Overvoltage With Inverter-Interfaced Distributed Energy Resources

Methodology for the design of energy production and storage systems in buildings: Minimization of the energy impact on the electricity grid

Alternative ways for voltage control in smart grids with distributed electricity generation

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