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Frequency response constrained economic dispatch with consideration of generation contingency size

Primary frequency response requirements to stop frequency excursion after contingency consider the largest contingency size resulting from the economic dispatch to balance demand at minimum cost. The maximum size of the generation contingency is a direct driver to determine a robust level of frequency control ancillary services and its reduction can promote a more efficient operation of the system; in extreme cases, contingency size reduction might be necessary to find feasible operation points. In particular, future systems with low inertia levels due to the increasing deployment of non-synchronous variable renewable energy might require high levels of primary response to stop frequency deviation after generation or transmission contingencies. This paper presents a mixed integer linear dispatch model that includes a novel set of hyperplanes that describe the primary frequency response not only as a function of the system’s inertia but also as a function the system’s maximum contingency size to comply with a frequency nadir limit after generation loss event. This allows to efficiently control the contingency size in order to reduce the costs of operation associated to the allocation of larger idle spinning capacity required to keep frequency within limits after the contingency event.

Author(s):

Sebastián Püschel-Løvengreen    
The University of Melbourne
Australia

Pierluigi Mancarella    
The University of Melbourne
Australia

 

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