This is the base model for analysis workflow examples.

Use functions which analyze Simscape™ logging data to get harmonic magnitudes, calculate total harmonic distortion percentage and plot harmonic magnitudes. The model to which this analysis is applied is of a three-phase rectifier. The functions demonstrated are:

A model of a two-bus three-phase power system network. The model uses three instances of the Load Flow Source block from Simscape™ Electrical™, one configured to be the swing bus, one configured to be the PV bus, and one configured to be the PQ load. The PV bus regulates its output to be at a voltage of 1.025 times rated voltage and to deliver 80MW active power to the network. The Swing bus regulates voltage at the other end of the transmission line to be one times rated voltage, and it delivers the requisite power to the network so that overall active and reactive powers balance. The Simscape initialization solver determines the required internal initial voltage amplitudes and phases in both the PV bus and the Swing bus so as to start in steady state.

A model of a 9-bus three-phase power system network. This example is based on an IEEE® benchmark test case, further details of which can be found in "Power System Control and Stability" by P. M. Anderson and A. A. Fouad (IEEE Press, 2003). Simscape™ initializes two of the generators to the specified powers and terminal voltages, and initializes the remaining swing bus generator to meet just the specified voltage. The resulting load flow solution is appended to each of the busbars post-simulation. The four rows correspond to per-unit voltage, phase, active power, and reactive power respectively. Looking at Bus 1, it can be seen from the annotation that the swing generator delivers 76.4MW of active power and 27.5MVAr or reactive power to the network. Differences to the original benchmark are due to the transmission line models and transformer configurations used.

Model a 9-bus three-phase power system network. This example is based on the IEEE benchmark test case. For more information, see "Power System Control and Stability" by P. M. Anderson and A. A. Fouad (IEEE Press, 2003)

Initialize a three-phase induction motor as part of a load flow analysis. When initializing an induction machine that is directly connected to an AC network, in steady state there is one degree of freedom which can be set by any one of shaft torque, shaft power, motor speed or electrical power.

Initialize synchronous machine as part of a load flow analysis. When initializing a synchronous machine there are two degrees of freedom which can be set by any two of rotor angle, active power, reactive power and terminal voltage. The pair of variables that are constrained is set by the source type drop-down menu, this having options of Swing bus, PV bus and PQ bus. Here the machine is configured for a swing bus with a 1.02 per-unit voltage and zero degrees phase.

An audio amplifier circuit based on an N-channel JFET. The desired operating point is taken to be Vds=5V, Id=2mA and Vgs=-2V. The manufacturer datasheet gives the JFET forward transfer conductance and output conductance values as 3mS and 50uS. These values are used to populate the mask of the N-Channel JFET block.

Perform a power-loss analysis using the ee_getPowerLossSummary function and the power_dissipated variable. The Rectifier contains six Diode blocks. Diodes D1, D2, D4, and D5 each dissipate, on average, 52.19 W over the course of the 0.5 second simulation. Diodes D3 and D6 each dissipate an average of 52.22 W for the same time period because they experience a 340 W transient power-dissipation spike due to DC-load capacitor charging before t = 1e-3 s. For each diode, the average power dissipated when the rectifier is operating in steady-state, t = 0.4 to 0.5 s, is 52.19 W.

Calculate the losses in a power converter using the ee_getPowerLossSummary function and the power_dissipated variable. The power converter contains six Diode blocks. Diodes D1, D2, D4, and D5 each loose, on average, 52.19 W over the course of the 0.5 second simulation. Diodes D3 and D6 each loose an average of 52.22 W for the same time period because they experience a 340 W transient power-dissipation spike due to DC-load capacitor charging before t = 1e-3 s. For each diode, the average power loss when the power converter is operating in steady-state, t = 0.4 to 0.5 s, is 52.19 W.

Use the Load Flow Analyzer to review the load flow results of a mixed AC/DC system. The model to which this analysis is applied includes an AC load flow source, a three-phase rectifier, and three loads. One of the loads is AC, one is permanently connected on the DC side, and one is switched on the DC side.