General Description

The test case provides a set of conditions under which a test can determine whether or how well a system, component or one of its aspects is working given its expected function.

Name of test case: UC03-TC1: downregulation baseline

Partner: DTU

Scope and Goal

What is the test objective, i.e. what is the purpose of carrying out the test? Try to formulate the objective within one of the following three categories:

1. Characterization: a measure is given without specific requirements for passing the test. Examples: understanding the behaviour of a system, developing a mathematical model of a component.
2. Validation: a requirement and abstract measure is provided, but the results are subject to interpretation, i.e. passing a test depends on a qualitative evaluation by an expert or user of the system. These tests seek to answer the question are we building the right system? Example: Is the mathematical model good enough?
3. Verification: acceptance of a test result depends on the direct evaluation against fixed and formalized assessment criteria. These criteria can be formulated as quantitative measures with a set/range of acceptable values of these measures, i.e. quantitative tests. These tests seek to answer the question are we building the system right? Example: Testing whether a component conforms to a standard.

This test case serves as an initial characterization of the impact of using electrical booster heaters in the district heating network in order to provide downregulation services to the electrical grid.

To which system configuration does this test apply? Nordhavn

To which use case does this test apply? UC03: Lower heat demand peaks in the heat distribution network by controlling power-to-heat units

Formulate one paragraph of narrative summarizing the test and its purpose:

In this test, electrical energy is dumped into the district heating network according to the requirements of the electrical grid, without consideration for the impact on the capacity of the district heating network to absorb the energy. The test will be repeated for several parameter combinations to determine in which cases coordination between electrical and heat networks is needed.

Identification of Test Components

What is the System Under Test, i.e. which subset of the entire system configuration needs to be simulated in order to achieve the test objective? (Note: In some cases this may be the entire system)

Entire system

What is the Object Under Investigation, i.e. which are the components of the System Under Test that are to be characterized or validated?

District heating network and its ability to absorb energy

What is the Function Under Investigation, i.e. which of the system behaviour defined in the use case is to be characterized, validated or verified?

Booster heater activation for the provision of downregulation service

Test Criteria

Formulate the target metrics, i.e. a list of quantities in the context of the System Under Test which can be used to qualify/quantify the test result with respect to the test objective.

- Load factor of the district heating network

- Occurrence of overload (capacity saturation) conditions

- Operating efficiency of the district heating network

Define quality attributes for assessing an acceptable test result. In case of a characteri-

zation test, this may be the remaining model uncertainty. For verification tests, the acceptance threshold (worst case for passing the test) is stated. For validation tests a criterion for ending the test execution is required.

The test is successful if one or more of the test runs (parameter variation) reveal situations where uncoordinated heat dumping leads to capacity issues in the DH network.