Single Phase Two Winding Variable Ratio Transformer

Description of the Single Phase Two Winding Variable Ratio Transformer component in Schematic Editor

Figure 1. Single Phase Two Winding Variable Ratio Transformer component in Typhoon HIL Schematic Editor

The Single Phase Two Winding Variable Ratio Transformer component models two coupled windings on the same core. The magnetization inductance Lm can be modeled as linear or with saturation. Core losses are modeled as a shunt resistance Rm. Both Lm and Rm are modeled on the primary side of the transformer. It is possible to neglect Lm and Rm by selecting Lm/Rm neglected in the Core model property. For more information on the Core model, please refer to Core model.

When the Core model property is set to Lm/Rm neglected, the primary inductance L1 may be degenerated. If it is desired to preserve L1, a snubber can be defined under the stability tab to provide an alternative current path at the transformer primary. Alternatively, the Refer L1 to secondary checkbox provides the option to refer the effects of inductance L1 to the secondary side of the transformer. If this option is selected, inductances L1 and L2 are replaced with a single variable inductor L2_var on the transformer secondary.

A schematic block diagram of the single phase two winding transformer block with the corresponding component arrangement and naming is shown in Figure 2.

Figure 2. The schematic block diagram of a Single Phase Two Winding Variable Ratio Transformer with corresponding components naming

Ports

  • prm_1 (electrical)
    • Primary (current source side) winding port 1.
  • prm_2 (electrical)
    • Primary (current source side) winding port 2.
  • sec_1 (electrical)
    • Secondary (voltage source side) winding port 1.
  • sec_2 (electrical)
    • Secondary (voltage source side) winding port 2.
  • ratio
    • Transfer ratio of the transformer.
  • out
    • Available if Enable signal output is checked
    • Internal variables of the transformer

General (Tab)

  • Input parameters
    • Specifies parameters format (SI or pu).
  • V1
    • Rated line to line voltage of primary winding [Vrms].
  • V2
    • Rated line to line voltage of secondary winding [Vrms].
  • R1
    • Available if Input parameters is set to SI.
    • Resistance of primary winding [Ω].
  • L1
    • Available if Input parameters is set to SI.
    • Leakage inductance of primary winding [H].
  • l1
    • Available if Input parameters is set to SI.
    • Initial current of primary winding [A].
  • R2
    • Available if Input parameters is set to SI.
    • Resistance of secondary winding [Ω].
  • L2
    • Available if Input parameters is set to SI.
    • Leakage inductance of secondary winding [H].
  • I2
    • Available if Input parameters is set to SI.
    • Initial current of secondary winding [A].
  • Core model
    • Selects transformer core model implementation.
    • Several levels of model fidelity are available - linear, non-linear, or Rm/Lm neglected.
  • Rm
    • Available if Input parameters is set to SI and Core model is set to Linear or Non-Linear.
    • Resistance representing the iron core losses [Ω].
  • Lm
    • Available if Input parameters is set to SI and Core model is set to Linear.
    • Magnetization inductance [H].
  • Sn
    • Available if Input parameters is set to pu.
    • Nominal Power of the transformer [VA].
  • fn
    • Available if Input parameters is set to pu.
    • Nominal frequency [Hz].
  • r1
    • Available if Input parameters is set to pu.
    • Resistance of primary winding [p.u.].
  • l1
    • Available if Input parameters is set to pu.
    • Leakage inductance of primary winding [pu].
  • i1
    • Available if Input parameters is set to pu.
    • Initial current of primary winding [pu].
  • r2
    • Available if Input parameters is set to pu.
    • Resistance of secondary winding [pu].
  • l2
    • Available if Input parameters is set to pu.
    • Leakage inductance of secondary winding [pu].
  • i2
    • Available if Input parameters is set to pu.
    • Initial current of secondary winding [pu].
  • rm
    • Available if Input parameters is set to pu and Core model is set to Linear or Non-Linear.
    • Resistance representing core losses [pu].
  • lm
    • Available if Input parameters is set to pu and Core model is set to Linear.
    • Magnetization inductance [pu].
  • lm flux
    • Available if Core model is set to Non-Linear and Input parameters is set to pu.
    • Vector of magnetic flux values [pu].
  • lm current
    • Available if Core model is set to Non-Linear and Input parameters is set to pu.
    • Vector of current values [pu].
  • Lm flux
    • Available if Core model is set to Non-Linear and Input parameters is set to SI.
    • Vector of magnetic flux values [A].
  • Lm current
    • Available if Core model is set to Non-Linear and Input parameters is set to SI.
    • Vector of current values [A].
  • Refer L1 to secondary
    • Available if Core model is set to Lm/Rm neglected.
    • If this option is selected, inductances L1 and L2 are replaced with a single variable inductor L2_var on the transformer secondary.

Signal Processing (Tab)

  • Execution rate
    • Defines the execution rate of measurement and signal processing components.
  • Enable signal output
    • Passes individual phase voltage and current values to a signal processing output port.
  • Use RMS
    • Available if Enable signal output is checked
    • Passes RMS values for measured voltages and currents

Stability (Tab)

  • Snubber Type
    • Adds a snubber to the current source side of the embedded single phase transformers.
  • Resistance
    • Available if Snubber Type is set to R or RC
    • Sets the series resistance value of the snubber
  • Capacitance
    • Available if Snubber Type is set to RC
    • Sets the series capacitance value of the snubber