Energisation of an MV electric boiler for load control in power systems with large share of renewables

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

The intermittence of some renewable energy sources, mainly wind and solar, leads to rapid power variations, which have to be controlled in order to maintain the system stable. Controllable loads, like MW range electric boilers, are a good solution for this problem, as the warmed water can be reused, minimising energy losses.
The boilers under analysis in this paper operate by increasing/decreasing the water level. Electric arcs appear between the electrodes and the water surface for a period of approximately 2s during the energisation. These arcs can be seen as faults to ground by the protections relays and trigger the ground fault protection. This paper uses field measurements made in a boiler installed in a power plant for the analysis of this issue.
The measurements are used to design a simulation model of the electric arc, which is used to study different energisation scenarios: With/without isolating transformer, different generator groundings and different grounding resistances. Monte Carlo method is used in order to simulate the randomness of the electric arcs, while the maximum zero-sequence current and voltage is registered.
The simulations show a good agreement with the measurements and can be used to estimate worst-case scenarios
Original languageEnglish
Title of host publicationProceedings of the 13th International Workshop on Large-Scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Power Plants (WIW2014)
Number of pages4
PublisherEnergynautics
Publication dateNov 2014
Publication statusPublished - Nov 2014
EventThe 13th International WORKSHOP on Large-Scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Power Plants - Berlin, Germany
Duration: 11 Nov 201413 Nov 2014

Conference

ConferenceThe 13th International WORKSHOP on Large-Scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Power Plants
CountryGermany
CityBerlin
Period11/11/201413/11/2014

Keywords

  • Controllable load
  • Secondary control
  • Boiler
  • Energisation transient
  • Electric arc

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    Silva, F. M. F. D., Bak, C. L., & Davidsen, T. (2014). Energisation of an MV electric boiler for load control in power systems with large share of renewables. In Proceedings of the 13th International Workshop on Large-Scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Power Plants (WIW2014) Energynautics.