DC Constant Power Load

Description of the DC Constant Power Load/Source component in Schematic Editor

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Figure 1. DC Constant Power Load

The DC Constant Power Load component is capable of acting as either a DC load or source with current saturation capability.

This component can be controlled from either HIL SCADA or from signal processing logic, by selecting Signal input as Control Method.

Ports

  • Port1 (electrical)
    • DC+ port.
  • Port2 (electrical)
    • DC- port.
  • Pref (signal processing)
    • Available if Control Method is set to Signal input.
    • Signal input for providing power setpoints.

General (Tab)

  • Current Limit
    • Defines the value at which the output current will saturate.
  • Control Method

    • There are two control methods avaliable: SCADA input and Signal input.

    • When the SCADA input method is selected, the power setpoint is provided via a built-in SCADA input (Pref). If this control method is selected, it is possible to specify on which CPU the signal processing in the component will be executed.
    • When the Signal input option is selected, power setpoints are provided through signal input port.
  • CPU core
    • Available if Control Method is set to SCADA input.
    • Specifies on which CPU the signal processing in the component will be executed.
    • If either option 1 or 2 is selected, signal processing will be executed on the selected core of the User CPU. If System is selected, signal processing code in the component will be mapped to the System CPU.
  • Execution rate
    • The signal processing time step for calculating output current value.

Snubber (Tab)

  • Rsnb
    • Snubber resistance.

Since DC Constant power loads/sources are modeled as current sources, it is a good practice to add large resistances in parallel in order to avoid topological conflicts in the circuit. An example where this snubber resistance is required is when the contactor is directly connected to the power source. Without snubber resistances, the contactor switches cannot be opened as there must be a path for the current from the current source(s).

Internal analog measurements to the DC Constant Power Load

Analog output variable name Description
name_I Current of DC Constant Power Load
name_V Voltage of DC Constant Power Load

Extras (Tab)

The Extras tab gives you the opportunity to set Signal Access Management for the component.
Signal visibility is calculated based on the 'signal_access' property and whether or not a parent component in its hierarchy is locked or not. Components that are not contained within locked components expose their signals regardless of the 'signal_access' property. The 'signal_access' property can have one of three values:
  • Public - Components marked as public expose their signals on all levels.
  • Protected - Components marked as protected will hide their signals to components outside of their first locked parent component.
  • Inherit - Components marked as inherit will take the nearest parent 'signal_access' property value that is set to a value other than inherit.