The fundamental question in this lab: how does the behavior of the synchronous g

Question

The fundamental question in this lab: how does the behavior of the synchronous generator compare when operated in stand-alone mode vs paralleled (to the grid) mode? Look through the data and compare the response of the generator as exciter current, prime mover power and system load change when the generator is both operating in stand-along mode and when it is operating in parallel to the grid. There are many, many graphs that could be made and some of these quantities involved are phasor values, having both magnitude and angle. There are three primary independent variables (x-axis) in this experiment: exciter current, prime mover power, and system load. There are many dependent variables (y-axis) that could be graphed: I_ gen-load, Y _gen-load, I_ grid-load, V_ grid-load, rotational speed, torque, P_ prime-mover, P_ grid, P_ generator, Q_ prime-mover. Q_ grid, Q_ generator, S_ prime-mover, S_ grid, S_ generator. How does the exciter current affect real and reactive power when the generator is synchronized? Is there evidence of the generator actually operating as a motor during some of the experiment? As the load is changed during synchronized operation, how does the grid and the generator respond to this change? After inspecting the synchronous generators, we will be using in this lab, describe how the DC magnetic field in the rotor is developed.

Explanation / Answer

1.The behavior of a synchronous generator is compared with respect to the frequency.When operated in standalone Mode, the system frequency is largely affected by a small change in either load or generation but when running in parallel, system frequency is hardly affected with due to the small change in load or generation. So with respect to frequency parallel operation results in better operation of the system as system frequency remains almost constant but in standalone mode, it is not so.

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