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@MBrooke you said about too many load drops can back fire the whole system, I think for this N-3 scenario there's not much to be done tbough. The two unfaulted substations (P. Branco and Xanxere) are fed by the Generator tied to S.Sorio bus, so if I don't drop those loads the voltage level will...

Those voltages beyond 1.1 pu happen when I cut off loads from the S. Osorio, P.Branco and Xanxere Station that's why there's a voltage swell. The 0.7 pu happens only when no action is taken after lost of three lines.

Here is the rotor angle of the remaining generators after the fault is cleared and the generator connected to the S.Osorio is also unplugged. The rotor angle keeps growing but synchronism is not lost though. The angle difference remains the...

I've come up with two solutions: First: As QBplanner pointed out, if the generators are Hydro Units I can reduce the generation in substation S.Osorio until there is a match between load and generation. Second: This is more complex. In this scenario the generator unit may not be dispatchable...

The generation does not trip in my case. It is a possible solution to loss of synchronism. In my case when I run the load flow with no fault, the line fluxes in the two lines of C. Mourao - S. Osorio is 109.28 MW and from S.Osorio to Areia is 105.089 MW. Then I think what I need to do is to...

The loss of synchronism I mean when the generator loses its rotor angle stability. And it is a bus fault in the bus S. Osorio I was thinking of that generation shedding due to the loss of that 3 lines. That'll be an over generation in the station Osorio and I need to reduce that generation or...

Hi, I am performing a simple work to evaluate the transitory stability of the system shown attached when a three-phase fault happens in the substation S. Osorio. Due to this fault three-lines shown in the picture have been cut off from the system. Now the system lost its synchronism, I need to...

Hey guys is that possible to connect a single-phase pv system to a three-phase grid? If yes, how will it work? I mean, it can only be connected neutral-phase or between two phases. Will it supply only single phase load? And the surplus energy, does it can be delivered to the grid? Will it...

You go on the element, for example a resistor, then and the end of the window you will see "measurements" choose what you want to measure, voltage, current or both. Later, drag and drop the multimeter into your project and choose the name of the element you chose before to see the waveforms. To...

You guys are right, my voltage source is ideal and I cannot see the change in frequency with the additional load. I am using a single phase system. I guess I may use a Controlled AC Voltage Source to account for this load increase. Using, for example: f-f0 =-k(P-P0). And plug into the voltage...

But that is the problem.. I don't want it to oscillate with 60 Hz, if there is a load increase the system should oscillate to a value below 60 Hz.

Hey guys I'm trying to perform a simulation in Matlab/Simulink to see the frequency variation with a load increase. I'm putting a AC voltage source behind a RL impedance with a PI model of the line. The first load is a RLC parallel load with P= 6kW Ql=1000 var and Qc=-1000 var. The second...

Hi guys, I'm trying to perform a project using PEM Fuel Cells, but I still don't know what approach I can give on this. I need an electrical approach. First I was thinking of using a fuel cell as a DG acting together with a three-phase inverter to provide active power to the grid...

I was meant to say switch. What I am trying to understand is how the amplitude of the gate voltage can exert influence in the output waveform of 6 pulse converter for example. For me the gate is either on or off no matter what is the amplitude.

Hi, I'd like to know how a IGBT works with a pulse generated by a pulse amplitude modulator (PAM). For me the amplitude of the pulse sent to the gate of igbt serves only to trigger it. I don't know how varying the amplitude can make any difference in the output waveform.

I think it's simple. It is necessary just to keep the excess oxygen constant and equal to 2.If someone has ever dealt with this, I wonder for some help. Thanks

Does someone have any simulation of pi or pid controller to control the supply of oxygen in a fuel cell?

I just want to know why do the graphs are not the same?

using simulinkhttp://files.engineering.com/getfile.aspx?folder=00a98c50-f2d8-445b-b88e-2becb3e3745f&file=controller_simulink.JPG

These are the images I got using matlab and simulink. They were suppose to be the same.http://files.engineering.com/getfile.aspx?folder=2abb2c32-7d95-4997-9fd7-425c565ce9f3&file=controller_matlab.jpg