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  • The snapshot feature is available through the HYPERSIM ribbon, in the simulation subset. It is only available during the simulation.
  • The goal of this feature is to save the state of the simulation at any given point in time in order to be able to force it onto the running simulation later on.
  • Snapshot is an image of the simulation at a specific simulation step. It saves the voltage and current value at all nodes as well as historical values for components requiring them such as lines and UCM.
  • It's often used to force steady-state conditions after events have destabilized the systems, or to study transient behavior more complicated or requiring longer to reproduce, such as the starting sequence of a machine. It is thus very practical to facilitate manual testing and essential to automate testing.
  • As an example, we'll use the HYPERSIM example model Transmission & Distribution/HVAC_735k_38Bus, as it requires a bit of time to stabilize at the beginning of the simulation.

Running real-time simulation also makes it easier to demonstrate the behavior of the snapshot, as with non-real-time simulation the acquisition is generally too fast to have the time to apply the snapshot during the acquisition.

  • To better illustrate the feature, change the Trip breaker component (at the bottom of the model) and remove its second Timing so that there is only one trigger event.
  • Open ScopeView, and load the template for this model, and start the simulation. Let the system stabilize. Take acquisitions regularly without triggers to watch it stabilize.

    ScopeView parameters :

        • 5.0 seconds acquisition
        • 20k sampling rate
        • Sync. checked
        • Terminal voltage Y-axis range : 0.99 - 1.01 pu

  • Once the system is stable, click the Take snapshot button in the simulation subset of the HYPERSIM ribbon. The ScopeView graph should look like this. (The other graphs aren't needed for the purpose of this example.)

    Terminal Voltage of Generators

  • Now, click the trigger checkbox in ScopeView controls, and take another acquisition. The acquisition should look like this.

    Terminal Voltage of Generators

  • Now to observe the application of the snapshot, take an acquisition and quickly click on the Load snapshot button in the simulation subset of the HYPERSIM ribbon. The acquisition should look like this.
  • This means that the event was triggered at 0.2 s as planned in the Trip component and destabilized the system. At 1.55s, loading the snapshot forced the state of the simulation when the snapshot was taken.

    Terminal Voltage of Generators

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