Thermal modelling and experimental validation for research on medium voltage DC cables

Shekhar, Aditya; Feng, Xianyong; Hebner, Robert E.; Gattozzi, Angelo L.; Strank, Shannon; Mor, Armando Rodrigo; Ramírez-Elizondo, Laura; Bauer, Pavol

doi:10.1109/pesgm.2017.8274559

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…The thermal stresses imposed on the conductors of the healthy links due to temporary overloading immediately after the ac breaker operation is an important consideration in deciding the acceptable time available for switching operations to restore the reconfigured system. The thermal inertia provides few minutes of overloading capacity without breaching the temperature limit [13]. Further, it is possible to operate the cable above its rated current capacity for a short duration.…”

Section: B Proposed Refurbished DC Topologymentioning

confidence: 99%

AC distribution grid reconfiguration using flexible DC link architecture for increasing power delivery capacity during (n-1) contingency

Shekhar

Kontos

Ramírez-Elizondo

et al. 2017

2017 IEEE Southern Power Electronics Conference (SPEC)

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A practical issue faced by today's ac grid is the rapidly growing power demand on its aging infrastructure. One possibility to maximize the capacity of the existing infrastructure is to refurbish the ac links to operate under dc conditions using modular multilevel converters. In this paper, the idea is applied to restructure an actual medium voltage distribution system. Further, a systematic reconfiguration strategy is proposed to maintain high power delivery capacity even during (n-1) contingency. Contingency analysis is carried out for faults in different system components of the distribution grid. Towards this goal, novel concepts such as reconfigurable switch, dc link converter bypass and flexible dc to ac operational transition are proposed.

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Section: B Proposed Refurbished DC Topologymentioning

confidence: 99%

AC distribution grid reconfiguration using flexible DC link architecture for increasing power delivery capacity during (n-1) contingency

Shekhar

Kontos

Ramírez-Elizondo

et al. 2017

2017 IEEE Southern Power Electronics Conference (SPEC)

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“…To hold the test sample temperature at the desired value during HV tests, the oil in the tanks at both ends could also be heated up to 80 • C using immersion heating rods. The mathematical basis and experimental validation of this method is presented in [30]. Since the present paper only reports data at room temperature, the high current set-up was used only to thermally age the cable and the oil heating apparatus was not used.…”

Section: C-l-3cmentioning

confidence: 99%

Impact of DC Voltage Enhancement on Partial Discharges in Medium Voltage Cables—An Empirical Study with Defects at Semicon-Dielectric Interface

et al. 2017

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Abstract:A scientific consensus is emerging on the benefits of direct current (DC) distribution in medium voltage (MV) power systems of ships and cities. At least 50% space savings and increased power transfer capacity are estimated with enhanced voltage DC operation of electric cables. The goal of this research is to contribute to developing the empirical knowledge on the insulation performance in order to validate the feasibility of such anticipated gains of DC versus alternating current (AC), and to determine the comparative impact of different operational conditions from a component engineering point of view. The partial discharge (PD) activity in cables is measured under AC and DC conditions as an indicator of insulation performance. Specifically, PDs in defects at the semicon-insulation interface are studied in terms of inception voltage, repetition rate and discharge magnitude. Empirical understanding is drawn for operating voltage and frequency dependence of the discharge behavior in such voids in the range of 10 to 20 kV and 0 to 0.1 Hz, respectively. The change in PD activity with void evolution post temperature-induced ageing process is explored.

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“…To hold the test sample temperature at the desired value during high voltage tests, the oil in the tanks at both ends could also be heated up to 80 • C using immersion heating rods. The mathematical basis and experimental validation of this method is presented in [28]. Since the present paper only reports data at room temperature, the high current set-up was used only to thermally age the cable and the oil heating apparatus was not used.…”

Section: Experimental Setup and Test Proceduresmentioning

confidence: 99%

Impact of DC Voltage Enhancement on Partial Discharges in Medium Voltage Cables - An Empirical Study with Defects at Semicon-Dielectric Interface

Shekhar¹,

Feng²,

Gattozzi³

et al. 2017

Preprint

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Abstract:A scientific consensus is emerging on the benefits of dc distribution in medium voltage power systems of ships and cities. At least 50 % space savings and increased power transfer capacity are estimated with enhanced voltage dc operation of electric cables. The goal of this research is to contribute to developing the empirical knowledge on the insulation performance in order to validate the feasibility of such anticipated gains of dc versus ac, and to determine the comparative impact of different operational conditions from a component engineering point of view. The partial discharge (PD) activity in cables is measured under ac and dc conditions as an indicator of insulation performance. Specifically, PDs in defects at the semicon-insulation interface are studied in terms of inception voltage, repetition rate and discharge magnitude. Empirical understanding is drawn for operating voltage and frequency dependence of the discharge behavior in such voids in the range of 10 to 20 kV and 0 to 0.1 Hz, respectively. The change in PD activity with void evolution is explored.

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Thermal modelling and experimental validation for research on medium voltage DC cables

Cited by 4 publications

References 6 publications

AC distribution grid reconfiguration using flexible DC link architecture for increasing power delivery capacity during (n-1) contingency

AC distribution grid reconfiguration using flexible DC link architecture for increasing power delivery capacity during (n-1) contingency

Impact of DC Voltage Enhancement on Partial Discharges in Medium Voltage Cables—An Empirical Study with Defects at Semicon-Dielectric Interface

Impact of DC Voltage Enhancement on Partial Discharges in Medium Voltage Cables - An Empirical Study with Defects at Semicon-Dielectric Interface

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