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Why there is always a consistent voltage of 11 kV in most of the generators up to 100 MW?
I am trying to model a load sharing simulation (code simulation) between multiple gensets on a common load bus. Are you aware of any articles/papers that would help with this task? The controls would be the simulated Vreg/Gov bias on the gensets leading to simulating the voltage and current output waveforms of the individual gensets connected to the common bus with bus frequency/voltage changes from load changes along with load sharing balances across the connected gensets. Any help would be very appreciated.Isn't it obvious? It does so because it is commanded to do so, you said so yourself. All good generators do as commanded, don't they?
Seriously, though, and in as few words as possible, when an operator clicks on Raise Spd/Ld or increases the Pre-Selected Load Control setpoint when the unit is being operated in Pre-Selected Load Control mode the fuel flow-rate into the turbine is increased, which increases the torque being produced by the turbine, which the generator converts to amps, which results in an increase in load.
For the exact details of what's happening, read on.
If one wants to make something spin, one needs to supply some force to it. That force is usually referred to as torque. The more torque applied to something, the faster it will usually spin. Decrease the torque applied to something, and it will usually slow down.
A gas turbine is a device that produces torque, and the amount of torque being produced can be varied, and is in direct proportion (usually) to the amount of fuel being burned in the combustor(s) of the gas turbine. Increase the fuel flow-rate, and the amount of torque being produced by the turbine will increase. Decrease the fuel flow-rate, and the amount of torque being produced by the turbine will decrease.
How are you coding the simulation? The most appropriate approach (and advice related to it) will depend on how you’re trying to model load flow. Using something like Matlab or (shudder) Python to solve the differential equations is incredibly laborious if you want your models close to reality. There are a number of load flow analysis programs that are almost intuitive that have all of the heavy coding built in—you just need to input the (hopefully) OEM-provided device models for the turbine, governor, exciter, xfmrs, and set up the steady state initial conditions (line impedance, x/r ratios, etc etc).I am trying to model a load sharing simulation (code simulation) between multiple gensets on a common load bus. Are you aware of any articles/papers that would help with this task? The controls would be the simulated Vreg/Gov bias on the gensets leading to simulating the voltage and current output waveforms of the individual gensets connected to the common bus with bus frequency/voltage changes from load changes along with load sharing balances across the connected gensets. Any help would be very appreciated.
Thank you all very much for your responses. I am coding it in C/C++. The simulation doesn't need to be perfect, it will be used as a training aid for tuning and simulating situations on paralleled diesel/gas gensets. Therefore, approximations in dynamic response are ok as long as the core dynamics of power push pull sharing between gens is simulated along with the bus voltage/frequency variations when generator power exceeds the load. The first round will hopefully be up to 16 generators supporting different sizes and configurable genset dynamics. A grossly oversimplified simulation would likely work well.How are you coding the simulation? The most appropriate approach (and advice related to it) will depend on how you’re trying to model load flow. Using something like Matlab or (shudder) Python to solve the differential equations is incredibly laborious if you want your models close to reality. There are a number of load flow analysis programs that are almost intuitive that have all of the heavy coding built in—you just need to input the (hopefully) OEM-provided device models for the turbine, governor, exciter, xfmrs, and set up the steady state initial conditions (line impedance, x/r ratios, etc etc).