Introduction of advanced testing procedures including PHIL for DG providing ancillary services

The provision of ancillary services by generators connected to distribution networks has been addressed in several international and national standards and guidelines in the last few years. Several testing procedures have been defined, however comprehensive tests for certain requirements are still missing. This paper addresses this gap by introducing testing procedures for specific requirements, but also for promising functionalities that are not yet thoroughly defined in standards. The status of current testing procedures concerning ancillary services is discussed. Several advanced open-loop testing procedures are proposed, that have not been sufficiently defined in current standards-guidelines. The procedures concern steady-state voltage support (such as Q(U) control) and frequency control (such as droop control and provision of inertia). In addition, procedures for Power-Hardware-in the Loop testing are proposed that show the added-value of this promising approach compared to conventional testing.