The Institution of Engineering and Technology (IET)
IET Generation Transmission & Distribution vol:9 issue:11 pages:1179-1185
An electrical power system is intended to transmit power from generation to load. In order to do so, it needs ancillary services to guarantee a certain level of reliability and quality. With the emergence of DC grids, it becomes necessary to ask what ancillary services they may themselves require, and how DC grids should be required to interact with the remainder of the system. This paper defines a first basic set of ancillary services for HVDC grids which didn’t exist so far, and it shows that this development could affect the ancillary services in AC grids. The paper describes how the origin of ancillary services can change if an HVDC grid is added to the existing AC grids and gives an overview of existing definitions for ancillary services.