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: Peak shaving with basic system configuration.

Partner: KIT-IPE

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.

Verification of peak shaving of production plant with lithium-ion battery and power from grid.

To which system configuration does this test apply? KIT-IPE smart electronics production plant

To which use case does this test apply? Joint Use Case 4

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

In joint UC 4, peak shaving by utilizing lithium-ion battery will be tested in 4 steps. In the first test case, the production plant is driven only by the power from the grid and the battery, which is charged during valley.

The main purpose of peak shaving is to control the maximum demand and reduce the total consumption. The maximum value of power from grid can be used to indicate the effectiveness of the control function for peak shaving. Test should be conducted with data from the production plant.

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)

Production plant and the energy storage system. Renewable electricity generation will be involved in next step.

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

• Battery energy storage system.
• Controller of battery system.
• Grid.
• Production plant.
• Monitor of production load demand

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?

• ChargeBattery
• DischargeBattery
• Battery Control
• Power Control
• Production driven by grid and battery

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.

• Maximum of power demand from grid.

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

• acuity of the peak: maximum P- average P < X%