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Requests for Proposals

​​RFD: Investigation on approximation steady-state criteria for assessing the dynamic performance without detailed dynamic studies​

2 Background and Overview

This Request for Proposal (RFP) has been prepared by ENTSO-E Drafting Team Planning Standards, working under the supervision of Working Group System Design Strategy, in the framework of the activities related to the evolution of ENTSO-E cooperation for coordinated planning and continuous improvement of the Ten Year Network Development Plan methodologies. The investigation aims to explore the dynamic properties of the European power system regions, based on approximation steady state indicators to facilitate the identification and assessment of relevant stability challenges.

The purpose of this RFP is to solicit offers from various candidate vendors, conduct a fair evaluation and selection process based on the requirements specified in this document, and select the vendor who can best deliver the results which ENTSO-E needs.

3 Proposal Guidelines

This Request for Proposal represents the requirements for an open and competitive evaluation and selection process. Proposals will be accepted until 5pm C.E.T on 6th October 2017.

If the organization submitting a proposal must outsource or contract any work to meet the requirements contained herein, this must be clearly stated in the proposal.

Additionally, all costs included in proposals must be all-inclusive to include any outsourced or contracted work. Any proposals which call for outsourcing or contracting work must include a name and description of the organizations being used for sub-contracting.

All costs must be itemized to include a clear explanation of all fees and costs.

4 Project Purpose and Description

Dynamic studies require a very detailed representation of the power system's components resulting in high modelling effort. The calculations needed for these studies include time domain simulations, which are extremely time-consuming when compared to calculations in steady state, e.g. load flow calculations. For this reason, criteria based on steady-state information can be useful to assess power system design and generation cases. This may include methodologies suitable to use with load flow calculations, short circuit calculations and assessment of market model results (e.g. amount of synchronous machines).

Steady-state indicators cannot replace the need for detailed dynamic analysis. However, for some issues, such as voltage and rotor angle stability, steady-state indicators can be useful as a filter function to identify and screen potential critical scenarios, which would need to be further analysed by dynamic simulation.

Several challenges must be taken into account in developing methodologies to assess dynamic phenomena without the effort of dynamic (mainly time-domain):

  1. Current practices on steady state indicators are based on TSOs past experience and are much related to the specific system characteristics and needs. System future needs are different from what we know today.
  2. Having in mind the energy transition it is reasonable to expect that the criteria and experience we have obtained so far on steady state indicators may not be sufficient to correctly reflect the new system stability issues. The challenge today is to act in anticipation of foreseen situations.
  3. Considering the increase of interdependency between systems and resulting needs for coordinated assessment, TSOs need to identify and agree on relevant indicators and filters to trigger detailed analysis if relevant. It is the TSOs responsibility to know if there is system security.
  4. This is a topic for which there are no full answers today and which requires investigation with theoretical research and validation procedures. New ideas and approaches are key.


Issue date for RFP11th,September 2017
Latest date for receipt of
29nd September 2017
Latest date for receipt of proposals6th,October 2017
Evaluation of proposals9th,October 2017
Notification of selected proposal10rd,November 2017
Contract commencement - anticipated17th,November 2017

The Full RFP can be found here ​ RFP​​


For further questions please contact dpowell@entsoe.eu