Test Specification TC17.TS1

TC17.TS1

TC17

Baseline test

This test will establish the performance of the dispatch mechanism in the absence of a fault recovery mechanism by establishing the (permanent) performance loss of the dispatcher as a result of a permanent loss of one aggregator from its portfolio. This performance loss will express itself in a degradation of the dispatcher’s ability to track a setpoint, and will depend on the amount of flexibility which can be taken over by the remaining aggregator(s).

Deviation of service delivered from service requested

• Input: Level of base load [kW]
• Input: Service requested (by DSO) to dispatch unit
• Input: Time of fault occurrence [s]
• Output: Active power production/consumption at individual DERs [kW]
• Output: Active power sum flow at grid connection [kW]

The test can be performed as a hardware experiment, a simulation experiment or a combination of the two.

• Configure grid, DER units and base load to bring system into initial state (t=t0)
• At t=t1, request a load relief service from the dispatch unit, wait for aggregators to activate DER units. Measure the effectiveness of the service delivery (impact on grid) after stabilization.
• At t=t2, command fault simulator to disrupt communication to aggregator 1
• Continue measuring the effectiveness of the service delivery for a period to determine the magnitude of the mismatch between service requested and service delivered.

• No service requested by dispatch unit
• All DERs in neutral state (not delivering a service)
• Feeder in overload condition by combined baseload+DER consumption
• Fault simulator in bypass state (no fault)

• Base load continues to change, following e.g. a random pattern
• Aggregator response tracks changes in base load

Electrical system measurements: 1s. Logging of ICT events (messages exchanged, communication fault event etc.) using timestamps with at least 1ms resolution.

Residual time synchronization difference between ICT entities

Elapsed time (fixed length experiment)