I'm using the Sinusoidal Measurement (PLL, Three-Phase) block in Simulink to measure frequency, angle, and magnitude from a 3-phase signal created using three Sine Wave blocks (50 Hz, 325 V peak, phases 0, 2π/3, 4π/3). These signals are connected via a Mux block (as a 3×1 vector) to the abc input of the PLL.
I observe:
- Frequency output = 50 Hz ✅
- Angle output = ramps from 0 to 2π ✅
- Magnitude output = always zero (0) ❌
I tried:
- Delaying the signal using a Switch block to avoid flat start (signal connects after 0.05 s)
- Changing PLL loop filter gains and initial frequency
- Checking signal shape in Scope (sine waves appear correct)
Still, the Mag output remains zero.
How can I resolve this and get the correct magnitude output?
Thanks in advance for your help!
