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lecture23

# lecture23 - Multi-machine Systems Each synchronous machine...

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Power Systems I Multi-machine Systems Each synchronous machine is represented by a constant voltage source behind the direct axis transient reactance The input powers are assumed to remain constant Using the pre-fault voltage, all loads are converted to equivalent admittances to ground and are assumed to remain constant Damping or asynchronous powers are ignored The mechanical rotor angle of each machine coincides with the electrical angle of the excitation voltage source

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Power Systems I Modeling Steps Solve the initial load flow and obtain the initial bus voltage magnitude and phase angle Calculate the machine currents prior to the disturbance Obtain the voltages behind the transient reactances Convert all loads to equivalent admittances * * i mach i mach i mach V S I = i mach d i mach i mach I X j V E + = 2 2 * 0 i i i i i i V Q j P V S y = =
Power Systems I Modeling Steps Combine the generator models with the network’s bus

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