Regional coordination in ancillary services: An innovative study for secondary control in the Iberian electrical system P.M.S. Frade G.J. Osório J.J.E. Santana J.P.S. Catalão Publication Journal: International Journal of Electrical Power and Energy Systems Year of Publication: 2019 Identifiers Other Numbers: 2-s2.0-85062084739 Alternative titles DOIGoogle ScholarBibTeXRIS Locators