MATLAB: Method of short-circuit calculation is used in Simscape

Question

Which method of short-circuit calculation is used in Simscape?

Answer 1

In Three Phase Fault block of Simscape-Electrical-Specialized Power Systems for short-circuits simulation the fault is implemented by a combination of breaker and breaker Resistance (Ron).

When fault condition is to be simulated, the breaker is closed and the breaker resistance (typically in ohms) will be negligible compared to load resistance (typically in Mohms) thus simulating large fault current in the circuit.

During normal operating conditions, breaker will be on and it has infinite resistance.

• The following documentation on Three-Phase fault documents this: https://www.mathworks.com/help/releases/R2018b/physmod/sps/powersys/ref/threephasefault.html?s_tid=doc_ta

Simulink Solver will form simultaneous differential equations for entire system if continuous solver is chosen and algebraic equations if discrete solver is chosen.

All the equations will be solved to produce the simulation result. As Simulink solver is computationally capable of handling complex equations, superposition principle is not used.