A new methodology for power systems flexibility evaluation

Abstract

In a free-market scenario, power system planning is affected by a significant degree of uncertainty about time and location of generating assets expansion. The paper contains a methodology for the evaluation of the flexibility, defined as the attitude of the transmission system to adapt, quickly and with limited costs, to every change, from the initial planning conditions, with a particular regard to the changes in generation. The method provides new global and local flexibility indices, based on technical and economical parameters, defined as Technical Uncertainty Scenarios Flexibility Index (T-USFI) and Technical Economical Uncertainty Scenarios Flexibility Index (TE-USFI). The T-USFI computation segment of methodology has been tested on simple networks

Economic Decision-Making for Coal Power Flexibility Retrofitting and Compensation in China

“…The maximum downward flexibility can be calculated by the following model: max E td sub. to 0.2P n ≤ P ≤ P n r d1 ≤ r d2 ≤ r sd2 (11) As for the analysis of upward flexibility E tu , all the maximum flexible electricity values are calculated with P as the choice variable and shown in Figure 6.…”

“…A number of power system flexibility researchers have investigated how to define power system flexibility and flexibility metrics [3][4][5][6], how to evaluate it [7][8][9][10][11][12][13][14] and which resources can provide flexibility [15,16]. Basically, the flexibility resources focus on demand side resources [17][18][19], energy storage [20][21][22][23], advanced energy conversion technologies [24,25], and so on.…”

A LP and MILP methodology to support the planning of transmission power systems

“…Relating to the issue of GE is the concept of flexibility discussed in [12][13][14][15][16][17]. The Authors propose an alternative methodology in static planning assuming as index of saturation the margin of each line, defined as the difference between the maximum power that a line can carry for a continuous time (thermal limit) and the power that flows in different possible operating conditions.…”

“…In [12], the Authors introduced a new acceptation of flexibility related to generation changes and developed different methodologies to its assessment. In [13] flexibility was defined as the attitude of the transmission system to keep up a desired standard of reliability at reasonable operation costs when generation scenarios change. A heuristic index named Uncertain Scenarios Flexibility Index (H-USFI) was introduced as a direct measure of flexibility.…”

A new deterministic approach for transmission system planning in deregulated electricity markets

“…These indexes allow an evaluation of TS performances both for expansion and for operational system planning [3][4][5].…”