Scope: Treatment of all matters relating to design, construction, and operation of AC substations using HV power electronics as part of the electrical power system, including FACTS and HVDC converter stations. This includes the application of HV power semi-conductor equipment and all other components insofar as they affect the design, construction and operation of such substations. Interest in such components is limited to their effects on overall station parameters and does not include the detailed design of equipment itself.