Note that the initial values of all models have been already presaved with the same initial values. Right-click the EXCITATION block then select the type of excitation system you want to simulate. Open the EXCITATION block and note in the Initial values tab that the initial values of terminal voltage and field voltage are set respectively to 1.0 and 1.4273 pu.Ĩ. Note that the initial value of mechanical power has been set to 0.00027 pu (844 W) by the Load Flow tool.ħ. The value of the constant block connected to the torque input of the asynchronous motor has also been automatically set to 7964 N.Ħ.
Open the SM and ASM blocks and note that the initial values have been updated by the Load Flow tool. Press the 'Apply' button to apply the load flow solution to the model.ĥ. The table now display the actual machines active and reactive powers.Ĥ. Press the 'Compute' button to solve the load flow. A summary of the load flow settings is displayed in a table.ģ. In the Powergui menu, select 'Load Flow'. The "Active power generation P" parameter is set to 0.įor the asynchronous motor: The "Mechanical Power" parameter is set to 1.492e+006 W (2000 HP).Ģ.
The Load flow parameters of the machine and motor are defined in the Load Flow tab of the two blocks:įor the synchronous machine: The "Generator type" parameter is set to "PV", indicating that the load flow is performed with the machine controlling its active power and terminal voltage. To start the simulation in steady-state, the synchronous machine and the asynchronous motor need to be initialized by the Load Flow tool of powergui. A three-phase to ground fault occurs on the 25 kV system, causing opening of the 25kV circuit breaker. The 25 kV network is modeled by a R-L equivalent source with a short-circuit level of 1000 MVA and with a 5 MW load. A plant consisting of a resistive and motor load is fed at 2400 V from a distribution 25 kV network through a 6 MVA 25/2 kV Wye-Delta transformer and from an emergency synchronous generator/diesel engine unit.
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