Electrothermal Coordination in Cable Based Transmission Grids

Olsen, Rasmus; Holboell, Joachim; Gudmundsdottir, Unnur Stella

doi:10.1109/tpwrs.2013.2278040

Cited by 39 publications

(31 citation statements)

References 9 publications

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“…In order to analyze the fundamental characteristics of the line current variation model with line-temperature constraints, this paper uses a simple two-bus test system [25], as shown in Figure 4. The simulation analysis was performed for daytime (e.g., from 10:00 to 14:00), and the load in the receiving bus during daytime was assumed to be constant in order to keep the transmission line current constant in the absence of a PV system.…”

Section: Simulation Conditionsmentioning

confidence: 99%

“…However, when the penetration of IRESs is high, the transmission line current fluctuates significantly and does not change in a step-like manner. In particular, among a wide variety of DLRs, electro-thermal coordination is the term covering the operation and planning of transmission systems based on temperature instead of current [25], rather than changes in the ambient meteorological parameters.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation Method for Real-Time Dynamic Line Ratings Based on Line Current Variation Model for Representing Forecast Error of Intermittent Renewable Generation

2017

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Due the high penetration of intermittent renewable energy sources (IRESs), transmission line currents show large fluctuations and thus significant uncertainty. This makes it difficult to operate a power system without violating transmission capacity constraints. This paper evaluates the dynamic line ratings (DLRs) of overhead lines based on changes in the line current owing to the high penetration of intermittent renewable energy sources. In particular, by focusing on extremely large (but rare) forecasting errors in the intermittent renewable energy source output, which are generally inevitable in most forecasting methods, a model for representing the forecasting error in line with current variation due to intermittent renewable energy source output is developed. The model is based on a shape parameter that represents the equivalent current variation required for the same temperature increase as that due to the extremely large forecasting error. Finally, based on the annual minute-by-minute irradiance data, preventive control of the transmission network with dynamic line ratings is evaluated using worst-case parameter values.

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Section: Simulation Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation Method for Real-Time Dynamic Line Ratings Based on Line Current Variation Model for Representing Forecast Error of Intermittent Renewable Generation

2017

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“…For high voltage underground power cable, optic fibres can be implemented in the cable screen or in a pipe laid close to the centre phase [5]. However, the large number of distributed MV cables makes this solution unaffordable on the distribution level.…”

Section: Temperature Monitoringmentioning

confidence: 99%

Extending the Functionality of On-line PD Monitoring Equipment for MV Power Cables

Wouters

Wagenaars

2017

NORD-IS

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An on-line partial discharge (PD) monitoring and location system for medium voltage cable circuits was developed previously. This paper explores ways to extend its range of application. The extension includes PD location method by time domain reflectometry (TDR) when reflections are not easily identifiable. The functionality of the PD monitoring equipment can also be widened by sensing other quantities related to the condition of the cable insulation using the same device. Dynamic cable temperature monitoring can be achieved by recording variation in the high frequency signal propagation velocity along the cable. Water ingress in paper-insulated lead-covered (PILC) cable decreases the cable's characteristic impedance while it increases the permittivity of the insulation. It can be observed by changes in the reflection pattern from the cable or by a lowered propagation velocity. Instead of recording reflection patterns in time domain, a frequency domain approach based on an impedance scan is investigated to be applied for cables in service.

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“…In fact conductor temperature at certain conditions can constitute a reliability risk and needs to be considered and recorded. Several techniques have been developed for estimating conductor temperature, the most common ones been Finite element methods (FEM) [4], Finite difference methods (FDM) [5], step response method and Thermo electric equivalents (TEE) [6,7]. The TEEs is found to be computationally fast and accurate and hence is utilised in this paper particularly when considering the large number of cables and amount of simulations examined.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, real-time line ratings or time varying thermal ratings (TVTR) have been investigated by different researchers [3,[6][7][8]. However, studies have mainly focussed on overhead lines as a single component with limited considerations on the impacts on an entire system.…”

Section: Introductionmentioning

confidence: 99%

Probabilistic assessment of impacts of real-time line ratings on distribution networks

Buhari

Kopsidas

2014

2014 International Conference on Probabilistic Methods Applied to Power Systems (PMAPS)

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Abstract-Underground cabling systems which includes cables and ducts play a vital role in the planning and assessment of electro-thermal coordination that will incorporate smart energy transmission and utilize the prevailing weather conditions in implementing future smart distribution systems. This paper investigates the effects of increased adequacy through real-time line thermal ratings on network losses and risk of ageing. The analysis is performed on a range of underground cable duct installation methods in a distribution network. The paper proposes a new technique of assessing the reliability of distribution systems when real-time line rating is implemented on power cables considering the ducting methods and accounting for the reliability risks of cable ageing. Probabilistic assessments on nine different ducting installations for a buried 22kV XLPE cable showed that an oil pressure type cable ducting has the lowest risk of asset ageing when real-time line rating is implemented on the network.

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Electrothermal Coordination in Cable Based Transmission Grids

Cited by 39 publications

References 9 publications

Evaluation Method for Real-Time Dynamic Line Ratings Based on Line Current Variation Model for Representing Forecast Error of Intermittent Renewable Generation

Evaluation Method for Real-Time Dynamic Line Ratings Based on Line Current Variation Model for Representing Forecast Error of Intermittent Renewable Generation

Extending the Functionality of On-line PD Monitoring Equipment for MV Power Cables

Probabilistic assessment of impacts of real-time line ratings on distribution networks

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