Test Specification 19.02
Test Specification Definition
ID | 19.02 |
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Reference to Test Case | Test Case 19: Evaluation of unintended impacts of activation of flexibility resources on the quality of supply |
Title of Test | Evaluation of the impact of ICT support system for flexibility activation on the quality of supply. |
Test Rationale | This test is about evaluating the adequacy and vulnerability of the ICT support system during flexibility activation. The ICT infrastructure facilitates the communication between the utility / DSO, aggregators, TSO/energy retailers, and the flexibility resources on the user end. The test focusses on the ICT's function to carry the direct load control (DLC) signal from utilities (DSOs or aggregators) to the flexibility resource. In the adequacy investigation, the aim is to assess the impact of delays and packets losses in the control signals of flexibility activation on the quality of the supply and stability of the system. In addition, it also looks into identifying the vulnerabilities of the ICT support system towards the misuse cases. It assess how these vulnerabilities can be exploited by an attacker and measures the impact of these attacks on quality of supply or the stability of the system. |
Specific Test System (graphical) | The test system, shown in figure below, consists a power system, ICT and Control system. The power system is a distribution network with loads/Flexibility resources such as EVs/heating loads. The ICT/control system consists a direct load controller either at the DSO or at an aggregator (optional) that sends switching signals to the flexibility resources. The aggregator avails flexibility resources to TSOs in accordance with the contractual agreement in the reserve market. Hence, depending on the frequency level and the associated power, control signals are sent to the flexibility resources by the aggregators. The ICT system consist the communication network connecting the controller at the DSO or aggregator with the TSO/ Energy retailer and the flexibility resource on the end user side. In the middle, an attacker may interfere with the operation of the aggregator's communication to the upstream controllers or downstream communication to the flexibility resource's control. |
Target measures | Frequency, Voltage quality, vulnerability for LAA, delay, packet loss. |
Input and output parameters | Input parameters: Attack behavior, attack duration, background traffic behavior, Load/power of EVs (MW), nominal frequency, Output Parameters: delay, packet loss, load (MW), ∆ frequency, Voltage etc |
Test Design | The test design for achieving PoI #3 is as follows:
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Initial system state | In the power system: Normal loads in the system operate and the system reach stability. There is no activation of flexibility resources. In the ICT system: no attack is initiated, and no background traffic is injected. The operating frequency is at nominal value ~ 50 Hz, and the voltage quality is within the limits (±10% ) in the LV network. |
Evolution of system state and test signals |
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Other parameters | Customer side inconvenience parameter, aging of EV batter due to frequent charge-discharge cycles. |
Temporal resolution | 100 µs |
Source of uncertainty | Cyber-attack behavior, (data) traffic behavior, Load dynamics or power demand on flexibility resources. |
Suspension criteria / Stopping criteria | If the system become unstable i.e., ∆ frequency passes the threshold, overloading of the lines passing the threshold values. |