Dispersed generation and system structure - the crucial exchange layer

Nabuurs, P.; Vaessen, Peter

doi:10.1109/pes.2006.1709454

Cited by 3 publications

(11 citation statements)

References 2 publications

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“…Distributed Generation (DG) refers to generators installed close to power consumers and typically are small modular systems (usually from 1 kW to 1 MW) and in many cases clean from an environmental point of view [8,9]. DGs cover a broad range of technologies, e.g.…”

Section: Overview Of Development In Distributed Generationmentioning

confidence: 99%

“…Similarly, for the additive polarity, the SFCL impedance can be derived as In contrast to (4-1) and (4-2), here in (4-14) the positive sign "+" specifies subtractive polarity whereas the negative sign "-" indicates additive polarity. To avoid quenching of the superconductor before faults, the value of _ sc nom I calculated by (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) should be smaller than its quenching current q I (also identified as the critical current c I ) of the specific superconductor used.…”

Section: Operating Principle Of An Improved Flux-lock Sfclmentioning

confidence: 99%

“…As can be seen from (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) and (4-21), the impedance of the SFCL under normal conditions offers the potential to be adjusted through different parameter settings. Similarly the current flowing through the superconductor under fault conditions can be calculated using (4-22)…”

Section: Fault Operating Statementioning

confidence: 99%

“…Therefore, one potential way to minimize the voltage drop across the SFCL is to decrease the value of 1 L . However, from (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) and (4-23) it can obviously be seen that the fault current limiting effectiveness of the SFCL is mainly determined by its primary impedance ( It can be observed that a bigger value of 1 N will cause higher currents flowing into HTS under nominal operating conditions, which will greatly increase the cost.…”

Section: Improvement Of Iron Core Physical Structurementioning

confidence: 99%

“…Together with the setting of primary and secondary turn numbers, the self and mutual inductances of two coils of the device under nominal operation are computed and recorded. Then the device impedance SFCL Z can be calculated using (4)(5)(6)(7)(8)(9)(10)(11). Table 4.3 to Table 4.5 present the exemplary results calculated for different iron core designs, when the primary turn number is fixed with different values of turns ratio p (consequently different secondary turn numbers).…”

Section: P a G Ementioning

confidence: 99%

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Investigation of the Superconducting Fault Current Limiter (SFCL) applied in electrical power system with Distributed Generations (DGs)

Zhao¹

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Over the past few decades, electricity supply systems have greatly expanded and become far more sophisticatedly interconnected than ever, mainly due to the continuous increase of power demand. Consequently, the fault current levels have increased significantly and become a major concern for electric power systems and may bring adverse effects to system security and reliability. Meanwhile, the rapid and dramatic progress in Distributed Generations (DGs), particularly renewable energy based ones, have further increased the complexity of the power network and led to even larger pressures on system fault current capacity.DGs are generally small generator units installed close to the power consumers and involve the application of new energy conversion technologies, e.g. inverter-based grid connections.DGs under regular load conditions generally have the benefit of reducing power losses in the distribution system, since they are locally substituting energy delivery through the distribution network with local delivery. However, despite this favourable effect DGs also contribute fault currents in case of network faults, potentially adversely affecting the network protection system.For instance, in a radial distribution network the inverse time overcurrent relays are usually used for fault protection. As the introduction of DG into an existing distribution network inevitably increases the level of fault current with its fault current contribution and at the same time may change the direction of current flow, DG can ultimately disturb the original overcurrent relay coordination. Additionally, voltage aspect power quality is another task for power networks with DGs during faults. The increasing fault currents lead to voltage sags at the feeder neighbouring the faulty ones, potentially causing power instability. Besides, for DGs connected to the utility, since their output voltage and frequency are determined by the system AC source, they become very sensitive to external disturbances which can cause unnecessary disconnections in certain circumstances. Losing connection of a large number of DGs may lead Publications during candidature 1.

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Section: Overview Of Development In Distributed Generationmentioning

confidence: 99%

Section: Operating Principle Of An Improved Flux-lock Sfclmentioning

confidence: 99%

Section: Fault Operating Statementioning

confidence: 99%

Section: Improvement Of Iron Core Physical Structurementioning

confidence: 99%

Section: P a G Ementioning

confidence: 99%

See 3 more Smart Citations

Investigation of the Superconducting Fault Current Limiter (SFCL) applied in electrical power system with Distributed Generations (DGs)

Zhao¹

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Optimal planning of distributed generation systems in distribution system: A review

Viral

Khatod

2012

Renewable and Sustainable Energy Reviews

369

149

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Dynamic pricing in highly distributed power systems of the future

Kockar

Papadaskalopoulos

Štrbac

et al. 2011

2011 IEEE Power and Energy Society General Meeting

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Existing energy systems and markets are characterized by a relatively small number of participants interacting in high-volume wholesale markets with end-users mainly participating in separate retail markets. This paper presents a work which aims to develop a Distributed Energy Market that brings together all participants in an integrated real-time marketplace. Operation in such markets will be based on dynamic pricing of various services, starting from energy generation, ancillary services and active demand participations. For this operation, new market and businesses models and rules need to be developed and tested

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Dispersed generation and system structure - the crucial exchange layer

Cited by 3 publications

References 2 publications

Investigation of the Superconducting Fault Current Limiter (SFCL) applied in electrical power system with Distributed Generations (DGs)

Investigation of the Superconducting Fault Current Limiter (SFCL) applied in electrical power system with Distributed Generations (DGs)

Optimal planning of distributed generation systems in distribution system: A review

Dynamic pricing in highly distributed power systems of the future

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