Test Specification 16.02
Test Specification Definition
ID | 16.02 |
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Reference to Test Case | TC16 |
Title of Test | Frequency and Voltage stability response during BS |
Test Rationale | Once the BS generator is started by the BS controller to reenergize the grid, an interval follows within which several resources are reconnected. The main challenge that the BS generator and the system itself faces is the stability of frequency and voltage. Due to its nature, the requirements for this operating state should not be very strict. Nevertheless, rudimentary stability should always be maintained in order to avoid a new blackout. This test aims at evaluating the system’s capability to cope with the imbalances and maintain frequency as well as voltage stability within the required limits. |
Specific Test System (graphical) | The above test system is based on the MV distribution network benchmark application example by CIGRE1 |
Target measures |
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Input and output parameters | Input parameters
Output parameters
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Test Design | The test is carried out in a way that emulates the system behaviour after a black out. This implies the initial disconnection of lines and loads through the controllable circuit breakers and the start-up of the BS generator (BESS on Bus B-5). In this way, the system is sectionalized to its minimal connectivity state. |
Initial system state |
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Evolution of system state and test signals |
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Other parameters | N/A |
Temporal resolution | A sampling time of <100 ms is required for the accurate measurement of frequency and voltage variations. |
Source of uncertainty | Apart from the measurement uncertainties due to the instruments’ accuracy, additional uncertainties may be introduced by the communication channel delays between the controller and the DER units. In addition to that, the system operation is subject to uncertainties due to:
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Suspension criteria / Stopping criteria | The test should be suspended and restarted if one of the quality attributes described in the TC is not met. If stability is not ensured during the various reconnection actions, the control parameters should be readjusted and the test repeated. |