Title of Test

NHN.TC1.TS1

Author / Organization

Tue Vissing Jensen / DTU

Reference to Test Case

Test Rationale

This test characterizes district operation with and without Booster Heater Controller and Electric Storage Controller active, seeking to demonstrate that the local controllers respond to service requests from the aggregator controller.

Specific Test System

The system under test includes an electrical system, a district heating system and a control system. Each is sketched below.

The block called “Row Houses” consists of multiple small loads which are aggregated into a single, larger load.
Electrical system
Note, that only loads which are marked in red are inside the quarter under control. All buses are taken to be P-Q buses, with the grid acting as the slack bus. Rings 3-5 are summarized, as no buses are inside the district.

Test and Output Parameters

Test Parameters:

• P_import_limit: District electrical consumption bound requested from battery/EV units [kWe]
• P_export_limit: District electrical export bound requested from heating units [kWe]
• gamma: Scaling factor for district import and export [n.u.]

Outputs / Measured Parameters:

• P_PCC: Measured apparent electrical import at the district electrical network point of common coupling [kWe]
• Q_PCC: Measured heat import at the district heating network point of common coupling [kWq]
• P_booster: Measured electrical active power consumption of district booster heater [kWe]

Test Design

The test simulates 24 hours of district operation. During these 24 hours, the heat pump controller is asked to keep the forward temperature of the connected pipe above 70ºC.
Further, these services are requested of the Aggregator by the Distribution Grid Management:

• For 07:00 to 09:00, keep district electrical consumption below P_import_limit kW.
• For 11:00 to 14:00, keep district electrical consumption above P_export_limit kW.
• For 17:00 to 19:00, keep district electrical consumption below P_import_limit kW.

where these limits are defined as below.

The test consists of several model runs:

1. No service signal sent

2. Service signals sent

• gamma = 1.0
• gamma = 0.95
• gamma = 0.90
• gamma = 0.85
• gamma = 0.80

By comparing these model runs, whether the controllers respond to service requests can be established.

For run 1, set

• P_import_limit = inf
• P_export_limit = inf
• gamma=1.0

For subsequent runs, given the 99% quantile of district electrical import P_i_99 and the 1% quantile of district electrical import, P_i_1, let

• P_export_limit= gamma * P_i_1 kWe
• P_import_limit = gamma* P_i_99 kWe

I.e., the system is asked to restrict its import relative to the uncontrolled base case.

Component Models

The main component models are listed below, with references given to documents for units described at the time of writing.

Electrical units:
• Electrical distribution grid
• NHN Battery (see deliverable D4.1, Appendix B.2, page 47)
• NHN Charging post and electric vehicle (see deliverable D4.1, Appendix B.3, page 55)
• Photovoltaic panel model
Heating units:
• District heating network
• Thermal building model
• Domain-coupling units:
• NHN District booster heater (see deliverable D4.1, Appendix B.1, page 39)
Controller models:
• Local heat pump controller
• Local battery/EV controller
Each PCC is taken to have a fixed voltage/equivalent impedance or temperature/temperature droop.

Initial System State

Temporal Resolution

The test is run at a fixed time step of 10 seconds.

Evolution of System State and Test Signals

Source of Uncertainty

Stopping Criteria

Storage of Data