Test Case 18

18

Christoph Bauschmann, Matti Aro, Petra Raussi

1

ERIGrid 2.0

19/4/2021

Evaluation of various service definitions and activation patterns

Aggregation can serve the representation and coordinated operation with respect to energy markets. Cyber-physical interactions appear especially in congestion management, where aggregators may trade as well as in the facilitation and match-making in a Local Energy Community (LEC).

A peer-to-peer trading platform for energy community management leads to an implicit energy dispatch that is traced by the community manager. Prior to participation in a Virtual Power Plant (VPP) formed by distributed aggregations, the provided ancillary services undergo pre-qualification tests to their communication and flexibility characterization aspects.

This test case concerns the evaluation of the services required for and offered by an aggregation platform, as well as their connected activation patterns. The test scenarios serve the validation of continuous service provision under various disruptions and system settings.

The two scales of the power system considered here are MV/LV distribution networks and single LV distribution feeders, both with various loads, renewable generation, demand side flexibility, such as EV charging infrastructure, and other DERs.

Aggregator services providing stability and flexibility to the network

Activations patterns, services, impacts to power grid

• Electrical power system
• Control/ICT

• PoI#1: Evaluate system services and connected activation patterns of an aggregator platform (e.g., fast frequency response, Fault Ride Through, blackstart assistance, coordinated voltage control, virtual inertia provision)
• PoI#2: Evaluate continuous service provision under disruptions and addressment of irregularities (e.g., congestion, loss of a line/generator, errors in forecast/measurement)
• PoI#3: Determine/validate pre-qualification factors for ancillary services

• Distribution system (lines, transformers, etc.): power distribution network (MV/LV) / LV distribution feeder
• Local energy community (LEC): flexible loads (domestic), inflexible loads (e.g., ships), DERs (e.g., PV, wind turbine, energy storage system)
• Aggregation platform / VPP: energy sharing coordinator (control system), communication systems, measuring and monitoring devices

In-focus functions: Aggregator platform services

Emulated functions: Controlling functions of the systems (e.g., aggregator network management control methods, DER controlling, storage system controlling)

Actuation functions: Controllable loads, demand response signals

Observer functions: Monitoring of network properties (e.g., voltage, current, uncontrollable load)

• Safe and robust voltage for all nodes
• Transient and frequency stability
• Fulfillment (in real-time) of the scheduled power profile in presence of disruptions/errors
• Effectiveness of ancillary service activation patterns
• Scalability of aggregation and control solutions
• Communication functionality for aggregation, service matching, fail-over, configuration, and interoperability

• Voltage/frequency regulation regions: [image]
• Short fulfillment time
• Optimal dispatch of flexibilities

• Congestion (load)
• Loss of a line/generator
• Errors in forecast/measurement
• Medium-voltage variations
• Participating DERs (number & type)
• Concurrent services (interference/synergy)

• Power quality standard EN50160
• All node voltages within the specified limit (+ or -10%)
• Quick fault reduction