Crown PS-400 Manuel d'utilisateur télécharger pdf (Page 42)

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5. DYNAMIC TESTING

This chapter shows the results of test performed by the Virginia Tech Calibration System

and explain the interaction between the hardware and the software used to assess the dynamic

performance of a PMU, DUT A.

5.1. Step Change response

This section shows the tests performed for determining performance of PMUs in response

to step changes. The step change response tests include magnitude, phase angle, and frequency

tests.

The Run_Step_Test_on_DUTs_add VI is used to run the step change response tests. It

uses the concept of interleaving phasors developed in [15]. Each test is executed using the

NI_DUT_Step_add VI. The error data is sent to the Display&Store VI. This program displays

the errors and saves the data to NI DIAdem files.

The NI_DUT_Step_add VI Block diagram is shown in Figure 5.1. The Run_NI_Add VI

generates the test signals and starts the NI PMU. The Collect_data VI gathers and aligns the

phasor data according to their time stamps. The Analyze_Data VI performs the phasor

comparisons.

The Run_DUT_TCP_add VI is executed simultaneously with the

Run_Step_Test_on_DUTs_add VI to start the DUT.

The test parameters are inputted in the Run_Step_Test_on_DUTs_add VI Front Panel,

shown in Figure 5.2.

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Crown PS-400 Manuel d'utilisateur Page 42