MATLAB: I’m having convergence problems when I simulated single machine infinite bus with UPFC, how to solve it

Question

When I simulate single machine infinite bus with UPFC currents of the transmission lines have incoherent values.

Answer 1

Your UPFC block has no connection for output m. If you do not intend to use that output, you should connect it to a sink.

The upgrade advisor reports,

Complex signal mismatch. Input port 1 of 'GeneratorwithUPFC/Unified Power Flow Controller (Phasor Type)/Power Components Modeling (Shunt & Series Converter)/Power Components modeling (Shunt Converter)/Demux1' expects a signal of numeric type real. However, it is driven by a signal of numeric type complex

Complex signal mismatch. Output port 1 of 'GeneratorwithUPFC/Unified Power Flow Controller (Phasor Type)/Power Components Modeling (Shunt & Series Converter)/Power Components modeling (Shunt Converter)/dq-axis model of 3-ph RL branch' is a signal of numeric type complex. However, it is driving a signal of numeric type real

It appears to me that you are attempting to Demux a scalar signal. You might perhaps be thinking of it as complex and are perhaps trying to break out the real and imaginary parts by using demux. However, to break apart a complex signal you need a Complex To Real-Imag block.