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Report from the Expert Group ‘Requirements for Pump-Storage Hydro modules’ (EG PSH)

This report presents findings from the Expert Group on Pump-Storage Hydro modules, focusing on evaluating the Grid Connection Requirements. The report details key discussions, collaboration efforts, and ongoing work related to different PSH technologies. It addresses open questions regarding DFIG differences, frequency-related requirements, and the best approach for defining requirements for variable-speed technologies. The report emphasizes the importance of considering the hydraulic part in every requirement and highlights the fast frequency response times of hydro systems. The workplan remains on track with no anticipated changes at present.

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Report from the Expert Group ‘Requirements for Pump-Storage Hydro modules’ (EG PSH)

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  1. Report from the Expert Group ‘Requirements for Pump-Storage Hydro modules’ (EG PSH) Ralph Pfeiffer, Chair of EG PSH 12th Grid Connection European Stakeholder Committee Meeting 13 December 2018, Brussels

  2. EG PSH structure Chair: ENTSO-E, Ralph Pfeiffer Vice-Chair: VGB, Klaus Oberhauser Internal EG space Public space

  3. EG PSH meetings • 15 October 2018 kick off meeting • 13 November 2018, webinar • 10 December 2018, webinar • 16 listed members • 5 different representative organizations + 1 invited expert • 50% participation of members • >80% participation of organizations • Overall good collaboration among the members, with useful discussions • Timely input in accordance with follow up actions • Common space (SharePoint) and emails are used to provide inputs • Workplan continues as agreed with no changes foreseen at the moment

  4. Evaluation of RfG requirements for PSH modules • A template with RfG requirements has been created to assess better the different technologies • PSH techs were differentiated into • Fixed speed: • Synchronous • Single shaft ternary (hydraulic short circuit) • Variable speed: • DFIG • Full converter • Converter can be bypassed (to switch between fixed and variable speed pump mode) • Converter cannot be bypassed

  5. Snapshot from the template and ongoing work

  6. Questions and remarks • Open questions: • What do the differences in DFIG for wind and PSH mean in terms of requirements? • Should there be frequency-related requirements only for generation mode and not for pumping mode? (Operators are arguing, that according to NC ER pumps shall be disconnected at low frequencies, thus no requirements shall be imposed for pumps.) • Which way of defining the requirements is the best: Variable speed to be considered as PPM or as SPGM with exceptions? • General: • The hydraulic part has to be considered in every requirement • Frequency response times for hydro can be very fast

  7. Workplan Ongoing PMO support PSH&ESC PSH PSH

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